在centos 7中安装配置k8s集群的步骤详解
<p><span><strong>配置背景介绍</strong></span></p>
<p>
kubernetes是google开源的容器集群管理系统，提供应用部署、维护、扩展机制等功能，利用kubernetes能方便管理跨集群运行容器化的应用，简称：k8s（k与s之间有8个字母）</p>
<p>
为什么要用kubernetes这么复杂的docker集群管理工具呢？一开始接触了docker内置的swarm，这个工具非常简单快捷的完成docker集群功能。但是在使用docker1.13内置的swarm做集群的时候遇到vip负载均衡没有正确映射端口到外网，或者出现地址被占用的情况，这对高可用性的需求是不利的，然而又没找到一个解决方案，只能转投k8s。</p>
<p>
<span><strong>实验环境</strong></span></p>
<ul>
<li>
腾讯云</li>
<li>
centos7.3 64位</li>
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<p>
<span><strong>安装</strong></span></p>
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<code class="bash plain">yum-config-manager --add-repo https:</code><code class="bash plain">//docs</code><code class="bash plain">.docker.com</code><code class="bash plain">/v1</code><code class="bash plain">.13</code><code class="bash plain">/engine/installation/linux/repo_files/centos/docker</code><code class="bash plain">.repo </code>
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<code class="bash plain">yum makecache fast </code>
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<code class="bash plain">yum -y </code><code class="bash functions">install</code> <code class="bash plain">docker-engine-1.13.1 </code>
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<code class="bash plain">yum </code><code class="bash functions">install</code> <code class="bash plain">epel-release -y </code>
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<code class="bash plain">yum remove -y docker-engine* </code>
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<code class="bash plain">yum </code><code class="bash functions">install</code> <code class="bash plain">-y kubernetes etcd docker flannel</code>
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<span><strong>修改配置文件</strong></span></p>
<p>
注意下面的10.135.163.237换成自己服务器ip</p>
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<code class="bash functions">sed</code> <code class="bash plain">-i </code><code class="bash string">"s/localhost:2379/10.135.163.237:2379/g"</code> <code class="bash plain">/etc/etcd/etcd</code><code class="bash plain">.conf</code>
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<code class="bash functions">sed</code> <code class="bash plain">-i </code><code class="bash string">"s/localhost:2380/10.135.163.237:2380/g"</code> <code class="bash plain">/etc/etcd/etcd</code><code class="bash plain">.conf</code>
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<code class="bash functions">sed</code> <code class="bash plain">-i </code><code class="bash string">"s/10.135.163.237:2379/10.135.163.237:2379,http:\/\/127.0.0.1:2379/g"</code> <code class="bash plain">/etc/etcd/etcd</code><code class="bash plain">.conf</code>
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<code class="bash functions">sed</code> <code class="bash plain">-i </code><code class="bash string">"s/127.0.0.1:2379/10.135.163.237:2379/g"</code> <code class="bash plain">/etc/kubernetes/apiserver</code>
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<code class="bash functions">sed</code> <code class="bash plain">-i </code><code class="bash string">"s/--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota/--admission_control=NamespaceLifecycle,NamespaceExists,LimitRanger,ResourceQuota/g"</code> <code class="bash plain">/etc/kubernetes/apiserver</code>
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<code class="bash functions">sed</code> <code class="bash plain">-i </code><code class="bash string">"s/--hostname-override=127.0.0.1/--hostname-override=10.135.163.237/g"</code> <code class="bash plain">/etc/kubernetes/kubelet</code>
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<span><strong>修改host</strong></span></p>
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<code class="bash functions">vi</code> <code class="bash plain">/etc/hosts</code>
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<code class="bash plain">10.135.163.237 k8s_master</code>
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<span><strong>添加网络</strong></span></p>
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<code class="bash plain">systemctl </code><code class="bash functions">enable</code> <code class="bash plain">etcd.service</code>
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<span><strong>启动服务</strong></span></p>
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<code class="bash plain">service docker start </code>
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<code class="bash keyword">for</code> <code class="bash plain">SERVICES </code><code class="bash keyword">in</code> <code class="bash plain">etcd kube-apiserver kube-controller-manager kube-scheduler kube-proxy kubelet docker flanneld ; </code><code class="bash keyword">do</code> <code class="bash plain">systemctl restart $SERVICES; systemctl </code><code class="bash functions">enable</code> <code class="bash plain">$SERVICES; systemctl status $SERVICES; </code><code class="bash keyword">done</code><code class="bash plain">;</code>
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<span><strong>第一个demo</strong></span></p>
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<strong>编写文件a.yaml</strong></p>
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<code class="plain plain">apiVersion: extensions/v1beta1 </code>
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<code class="plain plain">kind: Deployment </code>
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<code class="plain plain">metadata: </code>
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<code class="plain spaces"> </code><code class="plain plain">name: my-app</code>
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<code class="plain plain">spec: </code>
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<code class="plain spaces"> </code><code class="plain plain">replicas: 2</code>
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<code class="plain spaces"> </code><code class="plain plain">template:</code>
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<code class="plain spaces"> </code><code class="plain plain">metadata:</code>
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<code class="plain spaces"> </code><code class="plain plain">labels:</code>
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<code class="plain spaces"> </code><code class="plain plain">app: my-app</code>
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<code class="plain spaces"> </code><code class="plain plain">spec:</code>
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<code class="plain spaces"> </code><code class="plain plain">containers:</code>
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<code class="plain spaces"> </code><code class="plain plain">- name: my-app</code>
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<code class="plain spaces"> </code><code class="plain plain">image: registry.alauda.cn/yubang/paas_base_test</code>
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<code class="plain spaces"> </code><code class="plain plain">ports:</code>
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<code class="plain spaces"> </code><code class="plain plain">- containerPort: 80</code>
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<code class="plain spaces"> </code><code class="plain plain">command: ["/bin/bash", "/var/start.sh"] </code>
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<code class="plain spaces"> </code><code class="plain plain">resources: </code>
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<code class="plain spaces"> </code><code class="plain plain">limits: </code>
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<code class="plain spaces"> </code><code class="plain plain">cpu: 0.5 </code>
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<code class="plain spaces"> </code><code class="plain plain">memory: 64Mi</code>
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<strong>编写文件b.yaml</strong></p>
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<code class="plain plain">apiVersion: v1 </code>
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<code class="plain plain">metadata: </code>
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<code class="plain spaces"> </code><code class="plain plain">name: my-app-svc</code>
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<code class="plain spaces"> </code><code class="plain plain">ports:</code>
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<code class="plain spaces"> </code><code class="plain plain">- port: 80</code>
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<code class="plain spaces"> </code><code class="plain plain">targetPort: 80</code>
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<code class="plain spaces"> </code><code class="plain plain">nodePort: 30964</code>
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<code class="plain spaces"> </code><code class="plain plain">type: NodePort</code>
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<code class="plain spaces"> </code><code class="plain plain">selector:</code>
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<code class="plain spaces"> </code><code class="plain plain">app: my-app</code>
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<strong>创建服务</strong></p>
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<code class="bash plain">kubectl create -f a.yaml --validate </code>
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<code class="bash plain">kubectl create -f b.yaml --validate</code>
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<strong>删除服务</strong></p>
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<code class="bash plain">kubectl delete -f a.yaml </code>
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<code class="bash plain">kubectl delete -f b.yaml</code>
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<span><strong>增加子节点</strong></span></p>
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安装软件</p>
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<code class="bash plain">yum-config-manager --add-repo https:</code><code class="bash plain">//docs</code><code class="bash plain">.docker.com</code><code class="bash plain">/v1</code><code class="bash plain">.13</code><code class="bash plain">/engine/installation/linux/repo_files/centos/docker</code><code class="bash plain">.repo </code>
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<code class="bash plain">yum makecache fast </code>
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<code class="bash plain">yum -y </code><code class="bash functions">install</code> <code class="bash plain">docker-engine-1.13.1 </code>
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<code class="bash plain">yum </code><code class="bash functions">install</code> <code class="bash plain">epel-release -y </code>
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<code class="bash plain">yum remove -y docker-engine* </code>
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<code class="bash plain">yum </code><code class="bash functions">install</code> <code class="bash plain">-y kubernetes docker flannel</code>
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修改配置文件（10.135.163.237为主节点ip，139.199.0.29为当前节点ip）</p>
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<code class="bash functions">sed</code> <code class="bash plain">-i </code><code class="bash string">"s/--hostname-override=127.0.0.1/--hostname-override=139.199.0.29/g"</code> <code class="bash plain">/etc/kubernetes/kubelet</code>
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<code class="bash functions">sed</code> <code class="bash plain">-i </code><code class="bash string">"s/127.0.0.1:8080/10.135.163.237:8080/g"</code> <code class="bash plain">/etc/kubernetes/kubelet</code>
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<code class="bash functions">sed</code> <code class="bash plain">-i </code><code class="bash string">"s/--address=127.0.0.1/--address=0.0.0.0/g"</code> <code class="bash plain">/etc/kubernetes/kubelet</code>
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<code class="bash functions">sed</code> <code class="bash plain">-i </code><code class="bash string">"s/127.0.0.1:8080/10.135.163.237:8080/g"</code> <code class="bash plain">/etc/kubernetes/config</code>
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<code class="bash functions">sed</code> <code class="bash plain">-i </code><code class="bash string">"s/127.0.0.1:2379/10.135.163.237:2379/g"</code> <code class="bash plain">/etc/sysconfig/flanneld</code>
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<code class="bash functions">sed</code> <code class="bash plain">-i </code><code class="bash string">"s/--admission-control=NamespaceLifecycle,NamespaceExists,LimitRanger,SecurityContextDeny,ServiceAccount,ResourceQuota/--admission_control=NamespaceLifecycle,NamespaceExists,LimitRanger,ResourceQuota/g"</code> <code class="bash plain">/etc/kubernetes/apiserver</code>
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<strong>启动服务</strong></p>
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<code class="bash plain">service docker start</code>
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<code class="bash keyword">for</code> <code class="bash plain">SERVICES </code><code class="bash keyword">in</code> <code class="bash plain">kube-proxy kubelet docker flanneld; </code><code class="bash keyword">do</code>
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<code class="bash spaces"> </code><code class="bash plain">systemctl restart $SERVICES</code>
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<code class="bash spaces"> </code><code class="bash plain">systemctl </code><code class="bash functions">enable</code> <code class="bash plain">$SERVICES</code>
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<code class="bash spaces"> </code><code class="bash plain">systemctl status $SERVICES</code>
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<code class="bash spaces"> </code><code class="bash keyword">done</code><code class="bash plain">;</code>
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<strong>在主服务器查看节点</strong></p>
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<code class="bash plain">kubectl get node</code>
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<strong>重启服务（重新加入集群）</strong></p>
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<code class="bash plain">systemctl restart kube-apiserver.service</code>
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<strong>删除节点</strong></p>
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<code class="bash plain">kubectl delete node 节点ip</code>
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<span><strong>总结</strong></span></p>
<p>
以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作具有一定的参考学习价值，如果有疑问大家可以留言交流，谢谢大家对服务器之家的支持。</p>
<p>
原文链接：http://blog.yubangweb.com/k8sshi-jian-bi-ji/</p>
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