Centos 6.5 服务器优化配置备忘(一些基础优化和安全设置)
<p><strong>本文 centos 6.5 优化 的项有18处:</strong><br/>1、centos6.5最小化安装后启动网卡<br/>2、ifconfig查询IP进行SSH链接<br/>3、更新系统源并且升级系统<br/>4、系统时间更新和设定定时任<br/>5、修改ip地址、网关、主机名、DNS<br/>6、关闭selinux，清空iptables<br/>7、创建普通用户并进行sudo授权管理<br/>8、修改SSH端口号和屏蔽root账号远程登陆<br/>9、锁定关键文件系统（禁止非授权用户获得权限）<br/>10、精简开机自启动服务<br/>11、调整系统文件描述符大小<br/>12、设置系统字符集<br/>13、清理登陆的时候显示的系统及内核版本<br/>14、内核参数优化<br/>15、定时清理/var/spool/clientmqueue<br/>16、删除不必要的系统用户和群组<br/>17、关闭重启ctl-alt-delete组合键<br/>18、设置一些全局变量</p><p><strong>1、启动网卡</strong></p><p>#centos6.x最小化安装后，网卡默认不是启动状态<br/><code>ifup eth0</code></p><p><strong>2、SSH链接 ifconfig 查看IP后SSH终端连接。</strong></p><p><strong>3、更新源 最小化安装是没有wget工具的，必须先安装在修改源)</strong></p><p><code>yum install wget</code></p><p>备份原系统更新源</p><p><code>mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup</code></p><p>进入yum.repos.d目录</p><p><code>cd /etc/yum.repos.d</code></p><p>下载网易镜像源或者搜狐镜像源或者阿里云镜像源</p><div class="jb51code"><div><div id="highlighter_809489" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div><div class="line number3 index2 alt2">3</div><div class="line number4 index3 alt1">4</div><div class="line number5 index4 alt2">5</div><div class="line number6 index5 alt1">6</div><div class="line number7 index6 alt2">7</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">#下载网易镜像源：</code></div><div class="line number2 index1 alt1"><code class="plain plain">wget http://mirrors.163.com/.help/CentOS6-Base-163.repo</code></div><div class="line number3 index2 alt2"><code class="plain plain">#或者</code></div><div class="line number4 index3 alt1"><code class="plain plain">#下载搜狐镜像源：</code></div><div class="line number5 index4 alt2"><code class="plain plain">wget http://mirrors.sohu.com/help/CentOS-Base-sohu.repo</code></div><div class="line number6 index5 alt1"><code class="plain plain">#下载阿里云镜像源</code></div><div class="line number7 index6 alt2"><code class="plain plain">wget http://mirrors.aliyun.com/repo/Centos-6.repo</code></div></div></td></tr></tbody></table></div></div></div><div class="jb51code"><div><div id="highlighter_61091" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div><div class="line number3 index2 alt2">3</div><div class="line number4 index3 alt1">4</div><div class="line number5 index4 alt2">5</div><div class="line number6 index5 alt1">6</div><div class="line number7 index6 alt2">7</div><div class="line number8 index7 alt1">8</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">清空yum缓存</code></div><div class="line number2 index1 alt1"><code class="plain plain">yum clean all</code></div><div class="line number3 index2 alt2"><code class="plain plain">生存缓存</code></div><div class="line number4 index3 alt1"><code class="plain plain">yum makecache</code></div><div class="line number5 index4 alt2"><code class="plain plain">开始更新系统以及内核</code></div><div class="line number6 index5 alt1"><code class="plain plain">yum upgrade</code></div><div class="line number7 index6 alt2"><code class="plain plain">必备软件</code></div><div class="line number8 index7 alt1"><code class="plain plain">yum install lrzsz ntpdate sysstat -y</code></div></div></td></tr></tbody></table></div></div><div class="codetool" id="codetool"><div class="code_n"></div></div></div><p>使用lrzsz工具常用操作：rz 上传 sz 下载</p><p><strong>4、系统时间更新和设定定时任务 第一种：更新时间并且写入BOIS</strong></p><p><code>ntpdate time.windows.com && hwclock -w && hwclock --systohc</code></p><p>第二种：更新时间并且写入定时任务</p><p><br/></p><div class="codetitle"><span style="text-decoration:underline;">复制代码</span> 代码如下:</div><div class="codebody" id="code50358"><br/>echo '*/30 * * * * ntpdate time.windows.com && hwclock -w && hwclock --systohc >/dev/null 2>&1' >>/var/spool/cron/root<br/></div><p><br/></p><p>第三种：每间隔5分钟和10分钟同步一次时间</p><p><br/></p><div class="codetitle"><span style="text-decoration:underline;">复制代码</span> 代码如下:</div><div class="codebody" id="code42072"><br/>echo '*/5 * * * * /usr/sbin/ntpdate time.windows.com >/dev/null 2 >&1' >>/var/spool/cron/root<br/>echo '*/10 * * * * /usr/sbin/ntpdate time.nist.gov >/dev/null 2>&1' >>/var/spool/cron/root<br/></div><p><br/></p><p>提示：CentOS 6.x的时间同步命令路径不一样 6是/usr/sbin/ntpdate 5是/sbin/ntpdate</p><p><strong>5、修改ip地址、网关、主机名、DNS #eth0 网卡设置</strong></p><div class="jb51code"><div><div id="highlighter_664435" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div><div class="line number3 index2 alt2">3</div><div class="line number4 index3 alt1">4</div><div class="line number5 index4 alt2">5</div><div class="line number6 index5 alt1">6</div><div class="line number7 index6 alt2">7</div><div class="line number8 index7 alt1">8</div><div class="line number9 index8 alt2">9</div><div class="line number10 index9 alt1">10</div><div class="line number11 index10 alt2">11</div><div class="line number12 index11 alt1">12</div><div class="line number13 index12 alt2">13</div><div class="line number14 index13 alt1">14</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">mv /etc/sysconfig/network-scripts/ifcfg-eth0 /etc/sysconfig/network-scripts/ifcfg-eth0.bak</code></div><div class="line number2 index1 alt1"><code class="plain plain">vi /etc/sysconfig/network-scripts/ifcfg-eth0</code></div><div class="line number3 index2 alt2"><code class="plain plain">DEVICE=eth0 #网卡设备名称</code></div><div class="line number4 index3 alt1"><code class="plain plain">HWADDR=00:0C:29:D0:C7:B5 #以太网设备的对应的物理地址</code></div><div class="line number5 index4 alt2"><code class="plain plain">TYPE=Ethernet #网络类型为以太网模式</code></div><div class="line number6 index5 alt1"><code class="plain plain">UUID=080a457b-6a53-4a3a-9155-a23c1146c2c6 #通用唯一识别码</code></div><div class="line number7 index6 alt2"><code class="plain plain">ONBOOT=yes #是否启动引导的时候激活YES</code></div><div class="line number8 index7 alt1"><code class="plain plain">NM_CONTROLLED=no #设备eth0是否可以由Network Manager图形管理工具托管</code></div><div class="line number9 index8 alt2"><code class="plain plain">BOOTPROTO=dhcp #静态IP地址获取状态 如：DHCP表示自动获取IP地址</code></div><div class="line number10 index9 alt1"><code class="plain plain">IPADDR=192.168.1.10 #IP</code></div><div class="line number11 index10 alt2"><code class="plain plain">IPV6INIT=no</code></div><div class="line number12 index11 alt1"><code class="plain plain">IPV6_AUTOCONF=no</code></div><div class="line number13 index12 alt2"><code class="plain plain">NETMASK=255.255.255.0 #网卡对应的网络掩码</code></div><div class="line number14 index13 alt1"><code class="plain plain">GATEWAY=192.168.1.1 #网关地址</code></div></div></td></tr></tbody></table></div></div><div class="codetool" id="codetool"><div class="code_n"></div></div></div><p>检查网卡配置</p><p><code>cat /etc/sysconfig/network-scripts/ifcfg-eth0</code></p><p>网关配置</p><div class="jb51code"><div><div id="highlighter_714634" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div><div class="line number3 index2 alt2">3</div><div class="line number4 index3 alt1">4</div><div class="line number5 index4 alt2">5</div><div class="line number6 index5 alt1">6</div><div class="line number7 index6 alt2">7</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">vi /etc/sysconfig/network</code></div><div class="line number2 index1 alt1"><code class="plain plain">#表示系统是否使用网络，一般设置为yes。如果设为no，则不能使用网络，而且很多系统服务程序将无法启动</code></div><div class="line number3 index2 alt2"><code class="plain plain">NETWORKING=yes</code></div><div class="line number4 index3 alt1"><code class="plain plain">#设置本机的主机名，这里设置的主机名要和/etc/hosts中设置的主机名对应</code></div><div class="line number5 index4 alt2"><code class="plain plain">HOSTNAME=c65mini.localdomain</code></div><div class="line number6 index5 alt1"><code class="plain plain">#设置本机连接的网关的IP地址。例如，网关为10.0.0.1或者192.168.1.1</code></div><div class="line number7 index6 alt2"><code class="plain plain">GATEWAY=192.168.1.1</code></div></div></td></tr></tbody></table></div></div><div class="codetool" id="codetool"><div class="code_n"></div></div></div><p>修改主机DNS</p><div class="jb51code"><div><div id="highlighter_799627" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div><div class="line number3 index2 alt2">3</div><div class="line number4 index3 alt1">4</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">vi /etc/resolv.conf</code></div><div class="line number2 index1 alt1"><code class="plain plain">; generated by /sbin/dhclient-script</code></div><div class="line number3 index2 alt2"><code class="plain plain">nameserver 8.8.8.8</code></div><div class="line number4 index3 alt1"><code class="plain plain">nameserver 4.4.4.4</code></div></div></td></tr></tbody></table></div></div><div class="codetool" id="codetool"><div class="code_n"></div></div></div><p>修改HOSTS</p><div class="jb51code"><div><div id="highlighter_918430" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div><div class="line number3 index2 alt2">3</div><div class="line number4 index3 alt1">4</div><div class="line number5 index4 alt2">5</div><div class="line number6 index5 alt1">6</div><div class="line number7 index6 alt2">7</div><div class="line number8 index7 alt1">8</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">vi /etc/hosts</code></div><div class="line number2 index1 alt1"><code class="plain plain">127.0.0.1 c65mini.localdomain</code></div><div class="line number3 index2 alt2"><code class="plain plain">#使用DNS域名服务器来解析名字</code></div><div class="line number4 index3 alt1"><code class="plain plain">order bind hosts</code></div><div class="line number5 index4 alt2"><code class="plain plain">#一台主机是否存在多个IP</code></div><div class="line number6 index5 alt1"><code class="plain plain">multi on</code></div><div class="line number7 index6 alt2"><code class="plain plain">#如果用逆向解析找出与指定的地址匹配的主机名，对返回的地址进行解析以确认它确实与您查询的地址相配。为了防止“骗取”IP地址</code></div><div class="line number8 index7 alt1"><code class="plain plain">nospoof on</code></div></div></td></tr></tbody></table></div></div><div class="codetool" id="codetool"><div class="code_n"></div></div></div><p>重启网卡生效设置两种方法</p><div class="jb51code"><div><div id="highlighter_111285" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div><div class="line number3 index2 alt2">3</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">service network restart</code></div><div class="line number2 index1 alt1"><code class="plain plain">或者</code></div><div class="line number3 index2 alt2"><code class="plain plain">/etc/init.d/network restart</code></div></div></td></tr></tbody></table></div></div><div class="codetool" id="codetool"><div class="code_n"></div></div></div><p><strong>6、关闭selinux，清空iptables 在服务器配置完全成功后各项服务正常后，在开启selinux</strong></p><p>查看selinux状态</p><p>第一种方法：/usr/bin/setstatus -v #如果显示：SELinux status: enabled 就是开启状态<br/>第二种方法：cat /etc/selinux/config #如果显示：SELINUX=enforcing 则是开启状态permissive有提醒的状态 disabled是关闭<br/>第三种方法：grep SELINUX=disabled /etc/selinux/config<br/>第四种方法：getenforce</p><p>修改selinux状态 如果修改配置文件则永久生效，但是必须要重启系统</p><p>第一种：vi /etc/selinux/config 修改 SELINUX=disabled<br/>第二种：sed –i ‘s/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config<br/>如果想立即生效（如果想临时性的改变） setenforce 0</p><p><br/></p><div class="codetitle"><span style="text-decoration:underline;">复制代码</span> 代码如下:</div><div class="codebody" id="code20045"><br/>setenforce 1 设置SELinux 成为enforcing模式 setenforce 0 设置SELinux 成为permissive模式 查看状态 getenforce<br/></div><p><br/></p><p>iptables防火墙规则清理了，根据需求定制</p><div class="jb51code"><div><div id="highlighter_759512" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div><div class="line number3 index2 alt2">3</div><div class="line number4 index3 alt1">4</div><div class="line number5 index4 alt2">5</div><div class="line number6 index5 alt1">6</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">#清空iptables规则</code></div><div class="line number2 index1 alt1"><code class="plain plain">iptables -F</code></div><div class="line number3 index2 alt2"><code class="plain plain">#查看iptables规则</code></div><div class="line number4 index3 alt1"><code class="plain plain">iptables -L</code></div><div class="line number5 index4 alt2"><code class="plain plain">#保存规则，注意，虽然清空了，不保存的话，重启后，又会有规则。</code></div><div class="line number6 index5 alt1"><code class="plain plain">/etc/init.d/iptables save</code></div></div></td></tr></tbody></table></div></div><div class="codetool" id="codetool"><div class="code_n"></div></div></div><p><strong>7、创建普通用户并进行sudo授权管理</strong><br/>创建普通用户 useradd bingoku 修改用户密码 passwd bingoku</p><p>另一种方式：一次性创建用户和设置密码 echo "123456"|passwd --stdin bingoku&&history –c</p><p>其中bingoku为你创建的用户名<br/>sudo授权管理 打开sudo配置文件 visudo</p><div class="jb51code"><div><div id="highlighter_272014" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div><div class="line number3 index2 alt2">3</div><div class="line number4 index3 alt1">4</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">#按:set nu 查看行，找到99行</code></div><div class="line number2 index1 alt1"><code class="plain plain">root ALL=(ALL) ALL</code></div><div class="line number3 index2 alt2"><code class="plain plain">#添加</code></div><div class="line number4 index3 alt1"><code class="plain plain">bingoku ALL=(ALL) ALL</code></div></div></td></tr></tbody></table></div></div><div class="codetool" id="codetool"><div class="code_n"></div></div></div><p><strong>8、修改SSH端口号和屏蔽root账号远程登陆</strong></p><div class="jb51code"><div><div id="highlighter_895623" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div><div class="line number3 index2 alt2">3</div><div class="line number4 index3 alt1">4</div><div class="line number5 index4 alt2">5</div><div class="line number6 index5 alt1">6</div><div class="line number7 index6 alt2">7</div><div class="line number8 index7 alt1">8</div><div class="line number9 index8 alt2">9</div><div class="line number10 index9 alt1">10</div><div class="line number11 index10 alt2">11</div><div class="line number12 index11 alt1">12</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">#备份SSH配置 </code></div><div class="line number2 index1 alt1"><code class="plain plain">cp /etc/ssh/sshd_config sshd_config_bak </code></div><div class="line number3 index2 alt2"><code class="plain plain">#修改SSH安全配置 </code></div><div class="line number4 index3 alt1"><code class="plain plain">vi /etc/ssh/sshd_config</code></div><div class="line number5 index4 alt2"><code class="plain plain">#SSH链接默认端口</code></div><div class="line number6 index5 alt1"><code class="plain plain">port 52113</code></div><div class="line number7 index6 alt2"><code class="plain plain">#禁止root账号登陆</code></div><div class="line number8 index7 alt1"><code class="plain plain">PermitRootLogin no</code></div><div class="line number9 index8 alt2"><code class="plain plain">#禁止空密码</code></div><div class="line number10 index9 alt1"><code class="plain plain">PermitEmptyPasswords no</code></div><div class="line number11 index10 alt2"><code class="plain plain">#不使用DNS</code></div><div class="line number12 index11 alt1"><code class="plain plain">UseDNS no</code></div></div></td></tr></tbody></table></div></div><div class="codetool" id="codetool"><div class="code_n"></div></div></div><p>重新载入SSH配置 /etc/init.d/sshd reload 查看端口里面是否有刚才修改过的端口号52113</p><p><code>netstat -lnt</code><br/></p><p>或者反查端口是那个进程</p><p><code>lsof -i tcp:52113</code></p><p>centos6.5最小化安装没有lsof工具需要 yum install lsof</p><p><strong>9、锁定关键文件系统（禁止非授权用户获得权限）</strong></p><div class="jb51code"><div><div id="highlighter_18109" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div><div class="line number3 index2 alt2">3</div><div class="line number4 index3 alt1">4</div><div class="line number5 index4 alt2">5</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">chattr +i /etc/passwd</code></div><div class="line number2 index1 alt1"><code class="plain plain">chattr +i /etc/inittab</code></div><div class="line number3 index2 alt2"><code class="plain plain">chattr +i /etc/group</code></div><div class="line number4 index3 alt1"><code class="plain plain">chattr +i /etc/shadow</code></div><div class="line number5 index4 alt2"><code class="plain plain">chattr +i /etc/gshadow</code></div></div></td></tr></tbody></table></div></div><div class="codetool" id="codetool"><div class="code_n"></div></div></div><p><strong>10、精简开机自启动服务</strong></p><p>注意: 刚装完操作系统一般可以只保留crond，network，syslog，sshd这四个服务。 后期根据业务需求制定自启服务 #（Centos6.x为rsyslog Cetnos5.x为syslog） 如果是中文的话。可能会需要LANG=en 或者替换 3:on 成 3:启用</p><div class="jb51code"><div><div id="highlighter_180632" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div><div class="line number3 index2 alt2">3</div><div class="line number4 index3 alt1">4</div><div class="line number5 index4 alt2">5</div><div class="line number6 index5 alt1">6</div><div class="line number7 index6 alt2">7</div><div class="line number8 index7 alt1">8</div><div class="line number9 index8 alt2">9</div><div class="line number10 index9 alt1">10</div><div class="line number11 index10 alt2">11</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">#关闭全部服务</code></div><div class="line number2 index1 alt1"><code class="plain plain">for sun in `chkconfig --list|grep 3:on|awk '{print $1}'`;do chkconfig --level 3 $sun off;done</code></div><div class="line number3 index2 alt2"> </div><div class="line number4 index3 alt1"><code class="plain plain">#或者</code></div><div class="line number5 index4 alt2"><code class="plain plain">for sun in `chkconfig --list|grep 3:启用|awk '{print $1}'`;do chkconfig --level 3 $sun off;done</code></div><div class="line number6 index5 alt1"> </div><div class="line number7 index6 alt2"><code class="plain plain">#开启需要的服务</code></div><div class="line number8 index7 alt1"><code class="plain plain">for sun in crond rsyslog sshd network;do chkconfig --level 3 $sun on;done</code></div><div class="line number9 index8 alt2"> </div><div class="line number10 index9 alt1"><code class="plain plain">#或者需要使用防火墙的话可以开启iptables和ip6tables</code></div><div class="line number11 index10 alt2"><code class="plain plain">for sun in crond rsyslog sshd network iptables ip6tables;do chkconfig --level 3 $sun on;done</code></div></div></td></tr></tbody></table></div></div><div class="codetool" id="codetool"><div class="code_n"></div></div></div><p>查询下开启的服务 chkconfig –list | grep 3:on 或者 chkconfig –list|grep 3:启用</p><div class="jb51code"><div><div id="highlighter_343101" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div><div class="line number3 index2 alt2">3</div><div class="line number4 index3 alt1">4</div><div class="line number5 index4 alt2">5</div><div class="line number6 index5 alt1">6</div><div class="line number7 index6 alt2">7</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">$ chkconfig --list|grep 3:启用</code></div><div class="line number2 index1 alt1"><code class="plain plain">crond 0:关闭 1:关闭 2:启用 3:启用 4:启用 5:启用 6:关闭</code></div><div class="line number3 index2 alt2"><code class="plain plain">ip6tables 0:关闭 1:关闭 2:启用 3:启用 4:启用 5:启用 6:关闭</code></div><div class="line number4 index3 alt1"><code class="plain plain">iptables 0:关闭 1:关闭 2:启用 3:启用 4:启用 5:启用 6:关闭</code></div><div class="line number5 index4 alt2"><code class="plain plain">network 0:关闭 1:关闭 2:启用 3:启用 4:启用 5:启用 6:关闭</code></div><div class="line number6 index5 alt1"><code class="plain plain">rsyslog 0:关闭 1:关闭 2:启用 3:启用 4:启用 5:启用 6:关闭</code></div><div class="line number7 index6 alt2"><code class="plain plain">sshd 0:关闭 1:关闭 2:启用 3:启用 4:启用 5:启用 6:关闭</code></div></div></td></tr></tbody></table></div></div><div class="codetool" id="codetool"><div class="code_n"></div></div></div><p><strong>11、调整文件描述符大小</strong></p><p>#查看文件描述符大小<br/><code>ulimit -n </code></p><p>第一种：#这里参考的是阿里云主机默认设置。</p><div class="jb51code"><div><div id="highlighter_144361" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div><div class="line number3 index2 alt2">3</div><div class="line number4 index3 alt1">4</div><div class="line number5 index4 alt2">5</div><div class="line number6 index5 alt1">6</div><div class="line number7 index6 alt2">7</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">vi /etc/security/limits.conf </code></div><div class="line number2 index1 alt1"><code class="plain plain">* soft nofile 65535 </code></div><div class="line number3 index2 alt2"><code class="plain plain">* hard nofile 65535 </code></div><div class="line number4 index3 alt1"><code class="plain plain">* soft nproc 65535 </code></div><div class="line number5 index4 alt2"><code class="plain plain">* hard nproc 65535 </code></div><div class="line number6 index5 alt1"><code class="plain plain">* soft nofile 65535</code></div><div class="line number7 index6 alt2"><code class="plain plain">* hard nofile 65535</code></div></div></td></tr></tbody></table></div></div><div class="codetool" id="codetool"><div class="code_n"></div></div></div><p>第二种：echo '* - nofile 65535' >> /etc/security/limits.conf</p><p>第三种：把ulimit -SHn 65535命令加入到/etc/rc.local，然后每次重启生效 追加命令到rc.local配置文件里面</p><div class="jb51code"><div><div id="highlighter_549957" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div><div class="line number3 index2 alt2">3</div><div class="line number4 index3 alt1">4</div><div class="line number5 index4 alt2">5</div><div class="line number6 index5 alt1">6</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">cat >>/etc/rc.local<<EOF</code></div><div class="line number2 index1 alt1"><code class="plain plain">#open files</code></div><div class="line number3 index2 alt2"><code class="plain plain">ulimit -HSn 65535</code></div><div class="line number4 index3 alt1"><code class="plain plain">#stack size</code></div><div class="line number5 index4 alt2"><code class="plain plain">ulimit -s 65535</code></div><div class="line number6 index5 alt1"><code class="plain plain">EOF</code></div></div></td></tr></tbody></table></div></div><div class="codetool" id="codetool"><div class="code_n"></div></div></div><p>第四种：如果不修改limits配置文件，直接立即生效，但重启后又恢复之前的默认。 ulimit -SHn 65535</p><p><strong>12、设置系统字符集</strong><br/></p><p>第一种：<code>vi /etc/sysconfig/i18n</code></p><p>如果想用中文提示：LANG=”zh_CN.UTF-8″ 如果想用英文提示：LANG=”en_US.UTF-8″ 如果临时切换也可以 LANG=zh_CN.UTF-8</p><p>第二种：使用sed快速替换</p><div class="jb51code"><div><div id="highlighter_940437" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div><div class="line number3 index2 alt2">3</div><div class="line number4 index3 alt1">4</div><div class="line number5 index4 alt2">5</div><div class="line number6 index5 alt1">6</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">#替换成英文</code></div><div class="line number2 index1 alt1"><code class="plain plain">sed -i 's#LANG="zh_CN.*"#LANG="en_US.UTF-8"#' /etc/sysconfig/i18n</code></div><div class="line number3 index2 alt2"><code class="plain plain">#替换成中文</code></div><div class="line number4 index3 alt1"><code class="plain plain">sed -i 's#LANG="en_US.*"#LANG="zh_CN.UTF-8"#' /etc/sysconfig/i18n</code></div><div class="line number5 index4 alt2"><code class="plain plain">#替换成UTF-8中文</code></div><div class="line number6 index5 alt1"><code class="plain plain">sed -i 's#LANG="zh_CN.*"#LANG="zh_CN.UTF-8"#' /etc/sysconfig/i18n</code></div></div></td></tr></tbody></table></div></div><div class="codetool" id="codetool"><div class="code_n"></div></div></div><p><strong>13、清理登陆的时候显示的系统及内核版本</strong></p><div class="jb51code"><div><div id="highlighter_785119" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div><div class="line number3 index2 alt2">3</div><div class="line number4 index3 alt1">4</div><div class="line number5 index4 alt2">5</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">#查看登陆信息 </code></div><div class="line number2 index1 alt1"><code class="plain plain">cat /etc/redhat-release cat /etc/issue </code></div><div class="line number3 index2 alt2"><code class="plain plain">#清理登陆信息</code></div><div class="line number4 index3 alt1"><code class="plain plain">echo >/etc/redhat-release </code></div><div class="line number5 index4 alt2"><code class="plain plain">echo >/etc/issue</code></div></div></td></tr></tbody></table></div></div><div class="codetool" id="codetool"><div class="code_n"></div></div></div><p><strong>14、内核参数优化 </strong></p><p><code>vi /etc/sysctl.conf</code></p><div class="jb51code"><div><div id="highlighter_681270" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div><div class="line number3 index2 alt2">3</div><div class="line number4 index3 alt1">4</div><div class="line number5 index4 alt2">5</div><div class="line number6 index5 alt1">6</div><div class="line number7 index6 alt2">7</div><div class="line number8 index7 alt1">8</div><div class="line number9 index8 alt2">9</div><div class="line number10 index9 alt1">10</div><div class="line number11 index10 alt2">11</div><div class="line number12 index11 alt1">12</div><div class="line number13 index12 alt2">13</div><div class="line number14 index13 alt1">14</div><div class="line number15 index14 alt2">15</div><div class="line number16 index15 alt1">16</div><div class="line number17 index16 alt2">17</div><div class="line number18 index17 alt1">18</div><div class="line number19 index18 alt2">19</div><div class="line number20 index19 alt1">20</div><div class="line number21 index20 alt2">21</div><div class="line number22 index21 alt1">22</div><div class="line number23 index22 alt2">23</div><div class="line number24 index23 alt1">24</div><div class="line number25 index24 alt2">25</div><div class="line number26 index25 alt1">26</div><div class="line number27 index26 alt2">27</div><div class="line number28 index27 alt1">28</div><div class="line number29 index28 alt2">29</div><div class="line number30 index29 alt1">30</div><div class="line number31 index30 alt2">31</div><div class="line number32 index31 alt1">32</div><div class="line number33 index32 alt2">33</div><div class="line number34 index33 alt1">34</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">#可用于apache，nginx，squid多种等web应用</code></div><div class="line number2 index1 alt1"><code class="plain plain">net.ipv4.tcp_max_syn_backlog = 65536</code></div><div class="line number3 index2 alt2"><code class="plain plain">net.core.netdev_max_backlog = 32768</code></div><div class="line number4 index3 alt1"><code class="plain plain">net.core.somaxconn = 32768</code></div><div class="line number5 index4 alt2"> </div><div class="line number6 index5 alt1"><code class="plain plain">net.core.wmem_default = 8388608</code></div><div class="line number7 index6 alt2"><code class="plain plain">net.core.rmem_default = 8388608</code></div><div class="line number8 index7 alt1"><code class="plain plain">net.core.rmem_max = 16777216</code></div><div class="line number9 index8 alt2"><code class="plain plain">net.core.wmem_max = 16777216</code></div><div class="line number10 index9 alt1"> </div><div class="line number11 index10 alt2"><code class="plain plain">net.ipv4.tcp_timestamps = 0</code></div><div class="line number12 index11 alt1"><code class="plain plain">net.ipv4.tcp_synack_retries = 2</code></div><div class="line number13 index12 alt2"><code class="plain plain">net.ipv4.tcp_syn_retries = 2</code></div><div class="line number14 index13 alt1"> </div><div class="line number15 index14 alt2"><code class="plain plain">net.ipv4.tcp_tw_recycle = 1</code></div><div class="line number16 index15 alt1"><code class="plain plain">#net.ipv4.tcp_tw_len = 1</code></div><div class="line number17 index16 alt2"><code class="plain plain">net.ipv4.tcp_tw_reuse = 1</code></div><div class="line number18 index17 alt1"> </div><div class="line number19 index18 alt2"><code class="plain plain">net.ipv4.tcp_mem = 94500000 915000000 927000000</code></div><div class="line number20 index19 alt1"><code class="plain plain">net.ipv4.tcp_max_orphans = 3276800</code></div><div class="line number21 index20 alt2"> </div><div class="line number22 index21 alt1"><code class="plain plain">#net.ipv4.tcp_fin_timeout = 30</code></div><div class="line number23 index22 alt2"><code class="plain plain">#net.ipv4.tcp_keepalive_time = 120</code></div><div class="line number24 index23 alt1"><code class="plain plain">net.ipv4.ip_local_port_range = 1024 65535</code></div><div class="line number25 index24 alt2"> </div><div class="line number26 index25 alt1"><code class="plain plain">#以下参数是对centos6.x的iptables防火墙的优化，防火墙不开会有提示，可以忽略不理。</code></div><div class="line number27 index26 alt2"><code class="plain plain">#如果是centos5.X需要吧netfilter.nf_conntrack替换成ipv4.netfilter.ip</code></div><div class="line number28 index27 alt1"><code class="plain plain">#centos5.X为net.ipv4.ip_conntrack_max = 25000000</code></div><div class="line number29 index28 alt2"><code class="plain plain">net.nf_conntrack_max = 25000000</code></div><div class="line number30 index29 alt1"><code class="plain plain">net.netfilter.nf_conntrack_max = 25000000</code></div><div class="line number31 index30 alt2"><code class="plain plain">net.netfilter.nf_conntrack_tcp_timeout_established = 180</code></div><div class="line number32 index31 alt1"><code class="plain plain">net.netfilter.nf_conntrack_tcp_timeout_time_wait = 120</code></div><div class="line number33 index32 alt2"><code class="plain plain">net.netfilter.nf_conntrack_tcp_timeout_close_wait = 60</code></div><div class="line number34 index33 alt1"><code class="plain plain">net.netfilter.nf_conntrack_tcp_timeout_fin_wait = 120</code></div></div></td></tr></tbody></table></div></div><div class="codetool" id="codetool"><div class="code_n"></div></div></div><p>立即生效 /sbin/sysctl -p centos6.5可能会报错</p><div class="jb51code"><div><div id="highlighter_143686" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div><div class="line number3 index2 alt2">3</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">error: "net.bridge.bridge-nf-call-ip6tables" is an unknown key</code></div><div class="line number2 index1 alt1"><code class="plain plain">error: "net.bridge.bridge-nf-call-iptables" is an unknown key</code></div><div class="line number3 index2 alt2"><code class="plain plain">error: "net.bridge.bridge-nf-call-arptables" is an unknown key</code></div></div></td></tr></tbody></table></div></div><div class="codetool" id="codetool"><div class="code_n"></div></div></div><p>出现这个的原因是，没有自动载入bridge桥接模块</p><div class="jb51code"><div><div id="highlighter_827287" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">modprobe bridge</code></div><div class="line number2 index1 alt1"><code class="plain plain">echo "modprobe bridge">> /etc/rc.local</code></div></div></td></tr></tbody></table></div></div><div class="codetool" id="codetool"><div class="code_n"></div></div></div><p>查看桥接<code> lsmod|grep bridge</code></p><p>centos5.X可能会报错 这个错误可能是你的防火墙没有开启或者自动处理可载入的模块ip_conntrack没有自动载入，解决办法有二，一是开启防火墙，二是自动处理开载入的模块ip_conntrack</p><div class="jb51code"><div><div id="highlighter_847330" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div><div class="line number3 index2 alt2">3</div><div class="line number4 index3 alt1">4</div><div class="line number5 index4 alt2">5</div><div class="line number6 index5 alt1">6</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">error: "net.ipv4.ip_conntrack_max"is an unknown key</code></div><div class="line number2 index1 alt1"><code class="plain plain">error: "net.ipv4.netfilter.ip_conntrack_max"is an unknown key</code></div><div class="line number3 index2 alt2"><code class="plain plain">error: "net.ipv4.netfilter.ip_conntrack_tcp_timeout_established"is an unknown key</code></div><div class="line number4 index3 alt1"><code class="plain plain">error: "net.ipv4.netfilter.ip_conntrack_tcp_timeout_time_wait"is an unknown key</code></div><div class="line number5 index4 alt2"><code class="plain plain">error: "net.ipv4.netfilter.ip_conntrack_tcp_timeout_close_wait"is an unknown key</code></div><div class="line number6 index5 alt1"><code class="plain plain">error: "net.ipv4.netfilter.ip_conntrack_tcp_timeout_fin_wait"is an unknown key</code></div></div></td></tr></tbody></table></div></div><div class="codetool" id="codetool"><div class="code_n"></div></div></div><p>centos5.X解决方法：</p><div class="jb51code"><div><div id="highlighter_19114" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">modprobe ip_conntrack</code></div><div class="line number2 index1 alt1"><code class="plain plain">echo "modprobe ip_conntrack">> /etc/rc.local</code></div></div></td></tr></tbody></table></div></div><div class="codetool" id="codetool"><div class="code_n"></div></div></div><p>centos6.X可能会报错 这个错误可能是你的防火墙没有开启或者自动处理可载入的模块ip_conntrack没有自动载入，解决办法有二，一是开启防火墙，二是自动处理开载入的模块ip_conntrack</p><div class="jb51code"><div><div id="highlighter_383651" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div><div class="line number3 index2 alt2">3</div><div class="line number4 index3 alt1">4</div><div class="line number5 index4 alt2">5</div><div class="line number6 index5 alt1">6</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">error: "net.nf_conntrack_max"isan unknown key</code></div><div class="line number2 index1 alt1"><code class="plain plain">error: "net.netfilter.nf_conntrack_max"isan unknown key</code></div><div class="line number3 index2 alt2"><code class="plain plain">error: "net.netfilter.nf_conntrack_tcp_timeout_established"isan unknown key</code></div><div class="line number4 index3 alt1"><code class="plain plain">error: "net.netfilter.nf_conntrack_tcp_timeout_time_wait"isan unknown key</code></div><div class="line number5 index4 alt2"><code class="plain plain">error: "net.netfilter.nf_conntrack_tcp_timeout_close_wait"isan unknown key</code></div><div class="line number6 index5 alt1"><code class="plain plain">error: "net.netfilter.nf_conntrack_tcp_timeout_fin_wait"isan unknown key</code></div></div></td></tr></tbody></table></div></div><div class="codetool" id="codetool"><div class="code_n"></div></div></div><p>centos6.X解决方法：</p><div class="jb51code"><div><div id="highlighter_748337" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">modprobe nf_conntrack</code></div><div class="line number2 index1 alt1"><code class="plain plain">echo "modprobe nf_conntrack">> /etc/rc.local</code></div></div></td></tr></tbody></table></div></div><div class="codetool" id="codetool"><div class="code_n"></div></div></div><p>注意：笔者在整理这篇centos6.5内核优化的时候发现，如果不开启ip6tables去优化nf_conntrack模块去执行上面的解决方法会依旧提示上面的error。所以在优化服务的时候，可以选择留下iptables和ip6tables。当然如果不用iptables的话，在内核优化的时候就要去掉对nf_conntrack的设置，在进行/sbin/sysctl -p 是不会有错误提示的。</p><p><strong>15、如果安装sendmail必须定时自动清理/var/spool/clientmqueue/下文件防止inode节点被占满</strong></p><div class="jb51code"><div><div id="highlighter_550049" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div><div class="line number3 index2 alt2">3</div><div class="line number4 index3 alt1">4</div><div class="line number5 index4 alt2">5</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">#centos6.5已经不自动安装sendmail了所以没必要走这一步优化</code></div><div class="line number2 index1 alt1"><code class="plain plain">mkdir -p /server/scripts</code></div><div class="line number3 index2 alt2"><code class="plain plain">vi /server/scripts/spool_clean.sh</code></div><div class="line number4 index3 alt1"><code class="plain plain">#!/bin/sh</code></div><div class="line number5 index4 alt2"><code class="plain plain">find/var/spool/clientmqueue/-typef -mtime +30|xargsrm-f</code></div></div></td></tr></tbody></table></div></div><div class="codetool" id="codetool"><div class="code_n"></div></div></div><p><strong>16、删除不必要的系统用户和群组</strong></p><div class="jb51code"><div><div id="highlighter_847451" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div><div class="line number3 index2 alt2">3</div><div class="line number4 index3 alt1">4</div><div class="line number5 index4 alt2">5</div><div class="line number6 index5 alt1">6</div><div class="line number7 index6 alt2">7</div><div class="line number8 index7 alt1">8</div><div class="line number9 index8 alt2">9</div><div class="line number10 index9 alt1">10</div><div class="line number11 index10 alt2">11</div><div class="line number12 index11 alt1">12</div><div class="line number13 index12 alt2">13</div><div class="line number14 index13 alt1">14</div><div class="line number15 index14 alt2">15</div><div class="line number16 index15 alt1">16</div><div class="line number17 index16 alt2">17</div><div class="line number18 index17 alt1">18</div><div class="line number19 index18 alt2">19</div><div class="line number20 index19 alt1">20</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">#删除不必要的用户</code></div><div class="line number2 index1 alt1"><code class="plain plain">userdel adm</code></div><div class="line number3 index2 alt2"><code class="plain plain">userdel lp</code></div><div class="line number4 index3 alt1"><code class="plain plain">userdel sync</code></div><div class="line number5 index4 alt2"><code class="plain plain">userdel shutdown</code></div><div class="line number6 index5 alt1"><code class="plain plain">userdel halt</code></div><div class="line number7 index6 alt2"><code class="plain plain">userdel news</code></div><div class="line number8 index7 alt1"><code class="plain plain">userdel uucp</code></div><div class="line number9 index8 alt2"><code class="plain plain">userdel operator</code></div><div class="line number10 index9 alt1"><code class="plain plain">userdel games</code></div><div class="line number11 index10 alt2"><code class="plain plain">userdel gopher</code></div><div class="line number12 index11 alt1"><code class="plain plain">userdel ftp</code></div><div class="line number13 index12 alt2"><code class="plain plain">#删除不必要的群组</code></div><div class="line number14 index13 alt1"><code class="plain plain">groupdel adm</code></div><div class="line number15 index14 alt2"><code class="plain plain">groupdel lp</code></div><div class="line number16 index15 alt1"><code class="plain plain">groupdel news</code></div><div class="line number17 index16 alt2"><code class="plain plain">groupdel uucp</code></div><div class="line number18 index17 alt1"><code class="plain plain">groupdel games</code></div><div class="line number19 index18 alt2"><code class="plain plain">groupdel dip</code></div><div class="line number20 index19 alt1"><code class="plain plain">groupdel pppusers</code></div></div></td></tr></tbody></table></div></div><div class="codetool" id="codetool"><div class="code_n"></div></div></div><p><strong>17、关闭重启ctl-alt-delete组合键</strong></p><div class="jb51code"><div><div id="highlighter_960265" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div><div class="line number3 index2 alt2">3</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">vi /etc/init/control-alt-delete.conf</code></div><div class="line number2 index1 alt1"><code class="plain plain">#注释掉</code></div><div class="line number3 index2 alt2"><code class="plain plain">#exec /sbin/shutdown -r now "Control-Alt-Deletepressed"</code></div></div></td></tr></tbody></table></div></div><div class="codetool" id="codetool"><div class="code_n"></div></div></div><p><strong>18、设置一些全局变量</strong></p><div class="jb51code"><div><div id="highlighter_562834" class="syntaxhighlighterplain"><div class="toolbar">?</div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr class="firstRow"><td class="gutter"><div class="line number1 index0 alt2">1</div><div class="line number2 index1 alt1">2</div><div class="line number3 index2 alt2">3</div><div class="line number4 index3 alt1">4</div><div class="line number5 index4 alt2">5</div><div class="line number6 index5 alt1">6</div></td><td class="code"><div class="container"><div class="line number1 index0 alt2"><code class="plain plain">#设置自动退出终端，防止非法关闭ssh客户端造成登录进程过多，可以设置大一些，单位为秒</code></div><div class="line number2 index1 alt1"><code class="plain plain">echo "TMOUT=3600">> /etc/profile</code></div><div class="line number3 index2 alt2"><code class="plain plain">#历史命令记录数量设置为10条</code></div><div class="line number4 index3 alt1"><code class="plain plain">sed -i "s/HISTSIZE=1000/HISTSIZE=10/" /etc/profile</code></div><div class="line number5 index4 alt2"><code class="plain plain">#立即生效</code></div><div class="line number6 index5 alt1"><code class="plain plain">source /etc/profile</code></div></div></td></tr></tbody></table></div></div><div class="codetool" id="codetool"><div class="code_n"></div></div></div><p>以上就是生产服务器环境最小化安装后 Centos 6.5优化配置备忘，需要的朋友可以测试一下。后面就可以安装web环境了</p>
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