安装centos 7.9 系统
<h1 id="安装centos系统">安装centos系统</h1><h3 id="1-安装centos系统">1. 安装centos系统</h3>
<ul>
<li>
<p>我们开始安装centos7系统</p>
<ul>
<li>
<p>第一步，配置centos7，选择安装<br>
<img src="https://img2022.cnblogs.com/blog/1507553/202202/1507553-20220224095800484-862919847.png"></p>
<blockquote>
<p>使用上下键选择了，install Centos7后按tab键输入，net.ifnames=0biosdevname=0</p>
</blockquote>
</li>
<li>
<p>选择语言和键盘格式<br>
<img src="https://img2022.cnblogs.com/blog/1507553/202202/1507553-20220224095817433-870413162.png"></p>
<blockquote>
<p>选择默认就行</p>
</blockquote>
</li>
<li>
<p>手动配置一下磁盘<br>
<img src="https://img2022.cnblogs.com/blog/1507553/202202/1507553-20220224095843072-485795870.png"><br>
<img src="https://img2022.cnblogs.com/blog/1507553/202202/1507553-20220224095857520-1279010986.png"></p>
<blockquote>
<p>选择 I will configure partitioning进行配置<br>
<img src="https://img2022.cnblogs.com/blog/1507553/202202/1507553-20220224095913100-700308527.png"></p>
</blockquote>
<blockquote>
<p>点击 click here to create them automatically进行配置</p>
</blockquote>
</li>
<li>
<p>配置磁盘<br>
<img src="https://img2022.cnblogs.com/blog/1507553/202202/1507553-20220224095929475-97282271.png"></p>
<blockquote>
<p>这里根据情况配置，swap根据一般为内存的2倍，/boot一般默认1024mib就行，剩下的都给根级目录 "/"<br>
<img src="https://img2022.cnblogs.com/blog/1507553/202202/1507553-20220224095948082-1301134317.png"><br>
<img src="https://img2022.cnblogs.com/blog/1507553/202202/1507553-20220224100003111-447693986.png"></p>
</blockquote>
<blockquote>
<p>点击 Begin installation进行安装</p>
</blockquote>
</li>
<li>
<p>设置root密码<br>
<img src="https://img2022.cnblogs.com/blog/1507553/202202/1507553-20220224100018409-478322714.png"><br>
<img src="https://img2022.cnblogs.com/blog/1507553/202202/1507553-20220224100030124-1175609802.png"></p>
<blockquote>
<p>由于这里演示怎么安装，这里密码设置为123456，可以根据自己情况进行安装，确认密码后返回安装界面</p>
</blockquote>
</li>
<li>
<p>安装界面<br>
<img src="https://img2022.cnblogs.com/blog/1507553/202202/1507553-20220224100045693-1743532465.png"><br>
<img src="https://img2022.cnblogs.com/blog/1507553/202202/1507553-20220224100054335-301715940.png"></p>
<blockquote>
<p>点击重启，就到此安装完成</p>
</blockquote>
</li>
</ul>
</li>
<li>
<p>创建系统初始化test.sh脚本</p>
<pre><code class="language-shell"># vim system_Initialize.sh
# cat system_Initialize.sh
#!/bin/sh
#author:shichao
#date:2018/08/02
#mail:shichao@scajy.cn
[ -f /etc/init.d/functions ] && . /etc/init.d/functions||exit
function Basics(){
#安装epel，源
echo "epel源安装中，请稍等......"
yum install epel-release -y > /dev/null 2>&1
echo "epel源安装完成!"
echo "gcc-c++,gcc,make等工具安装中，请稍等......"
yum -y install gcc gcc-c++ gd cmake patchautomakemake autoconf libjpeg net-tools libjpeg-devel libpng libpng-devel freetype freetype-devellibxml2 libxml2-devel zlib zlib-devel glibc glibc-devel glib2 glib2-devel bzip2bzip2-devel ncurses ncurses-devel curl curl-devel e2fsprogs e2fsprogs-develkrb5 krb5-devel libidn libtools-libs libidn-devel openssl openssl-developenldap openldap-devel nss_ldap openldap-clients openldap-servers pcre-devel libmcrypt-devel readline-devellibcap-devel ntpdate vim tree wget> /dev/null 2>&1
if [ $? -eq 0 ] ; then
echo "gcc-c++,gcc,make等工具安装完成!"
fi
#系统基本设置，包括时间同步设置，firewalld，root禁止登陆等
#系统时间及时区设置
/usr/bin/timedatectl set-timezoneAsia/Shanghai
echo "正在同步网络时间......"
/usr/sbin/ntpdate cn.pool.ntp.org > /dev/null 2>&1 && echo "网络时间同步完成！" || echo "网络时间同步失败"
/sbin/hwclock --systohc
#设置为每天同步网络时间
if [ ! -f /var/spool/cron/root ]
then
touch /var/spool/cron/root
fi
is_ntpdate=$(grep "ntpdate" /var/spool/cron/root |wc -l)
if [ $is_ntpdate -eq 0 ] ; then
cat >> /var/spool/cron/root <<EOF
5923 * * * /usr/sbin/ntpdate cn.pool.ntp.org > /dev/null
EOF
fi
#禁用selinux和firewalld
/usr/bin/sed -i 's/^SELINUX=.*$/SELINUX=disabled/' /etc/selinux/config > /dev/null 2>&1&& echo "已禁用系统selinux"
/usr/bin/systemctlstop firewalld> /dev/null 2>&1
/usr/bin/systemctl disable firewalld >/dev/null 2>&1
setenforce 0
#系统升级
echo "系统正在升级中......该过程可能需要十几分钟或更久，请稍等！"
yum update -y > /dev/null 2>&1
if [ $? -eq 0 ] ; then
echo "系统升级成功"
fi
#系统参数优化
echo "正在优化系统参数......"
sed -i '5,$d' /etc/security/limits.d/20-nproc.conf
cat >> /etc/security/limits.d/20-nproc.conf <<EOF
* soft nproc 655350
* soft nofile 655350
* hard nofile 655350
* hard nproc 655350
root soft nproc unlimited
EOF
echo 10240 >/proc/sys/net/core/somaxconn
echo never > /sys/kernel/mm/transparent_hugepage/enabled&&echo never > /sys/kernel/mm/transparent_hugepage/defrag
sysctl vm.overcommit_memory=1 > /dev/null 2>&1
sed -i '10,$d' /etc/sysctl.conf
cat >> /etc/sysctl.conf <<EOF
vm.overcommit_memory = 1
net.ipv4.tcp_syncookies = 0
net.ipv4.ip_local_port_range = 1024 65535
net.core.rmem_max=16777216
net.core.wmem_max=16777216
net.ipv4.tcp_rmem=4096 87380 16777216
net.ipv4.tcp_wmem=4096 65536 16777216
net.ipv4.tcp_fin_timeout = 10
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_window_scaling = 0
net.ipv4.tcp_sack = 0
net.core.netdev_max_backlog = 30000
net.ipv4.tcp_no_metrics_save=1
net.core.somaxconn = 65535
net.ipv4.tcp_max_orphans = 262144
net.ipv4.tcp_max_syn_backlog = 262144
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 2
net.ipv4.tcp_retries2 = 5
net.ipv4.tcp_keepalive_time = 40
net.ipv4.tcp_keepalive_probes = 3
net.ipv4.tcp_keepalive_intvl = 10
EOF
echo "系统参数已经优化!"
#配置开机启动项
echo '' > /etc/init.d/optimizing
cat >> /etc/init.d/optimizing <<EOF
#!/bin/bash
### BEGIN INIT INFO
# Provides: optimizing
# Required-Start: \$local_fs
# Required-Stop:
# X-Start-Before: redis mongod mongodb-mms-automation-agent
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Optimizing script
# Description: Optimizing script.
### END INIT INFO
case \$1 in
start)
# transparent hugepage
thp_path=/sys/kernel/mm/transparent_hugepage
echo 'never' > \${thp_path}/enabled
echo 'never' > \${thp_path}/defrag
# somaxconn
echo '10240' > /proc/sys/net/core/somaxconn
ulimit -f unlimited
ulimit -t unlimited
ulimit -v unlimited
ulimit -n 655350
ulimit -m unlimited
ulimit -c unlimited
ulimit -u 655350
unset thp_path
;;
esac
EOF
if [ $? -eq 0 ] ;then
chmod 755 /etc/init.d/optimizing
chkconfig optimizing on
fi
if [ ! -d/app ]
then
mkdir -p /app
mkdir -p /app/backup
mkdir -p /app/data
mkdir -p /app/logs
mkdir -p /app/opt
mkdir -p /app/scripts
mkdir -p /app/tools
mkdir -p /app/www
else
mkdir -p /app/backup
mkdir -p /app/data
mkdir -p /app/logs
mkdir -p /app/opt
mkdir -p /app/scripts
mkdir -p /app/tools
mkdir -p /app/www
fi
}
while :
do
cat <<EOF
+---------------------------------------------------------------+
| |
| Thisisa LNMP |
| |
| 1.必须先执行 '1' 安装linux环境基础 |
| 2.退出安装程序 |
+---------------------------------------------------------------+
EOF
read -p "请你输入一个数字:" num
case "$num" in
1)
Basics
;;
2)
exit
;;
*)
echo '输入错误，已重新加载....'
;;
esac
done
</code></pre>
</li>
<li>
<p>执行系统初始化脚本</p>
<pre><code class="language-shell"># sh system_Initialize.sh
+---------------------------------------------------------------+
| |
| Thisisa LNMP |
| |
| 1.必须先执行 '1' 安装linux环境基础 |
| 2.退出安装程序 |
+---------------------------------------------------------------+
请你输入一个数字:1
epel源安装中，请稍等......
epel源安装完成!
gcc-c++,gcc,make等工具安装中，请稍等......
gcc-c++,gcc,make等工具安装完成!
正在同步网络时间......
网络时间同步失败
已禁用系统selinux
系统正在升级中......该过程可能需要十几分钟或更久，请稍等！
系统升级成功
正在优化系统参数......
系统参数已经优化!
+---------------------------------------------------------------+
| |
| Thisisa LNMP |
| |
| 1.必须先执行 '1' 安装linux环境基础 |
| 2.退出安装程序 |
+---------------------------------------------------------------+
请你输入一个数字:2
</code></pre>
</li>
</ul><br><br>
来源：https://www.cnblogs.com/scajy/p/15930418.html
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