使用Kubeadm在CentOS7.2上部署Kubernetes集群的方法
<p>本文参考kubernetes官网文章Installing Kubernetes on Linux with kubeadm在CentOS7.2使用Kubeadm部署Kuebernetes集群，解决了一些在按照该文档部署时遇到的问题。</p>
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操作系统版本</p>
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<code class="bash comments"># cat /etc/redhat-release </code>
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<code class="bash plain">CentOS Linux release 7.2.1511 (Core)</code>
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内核版本</p>
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<code class="bash comments"># uname -r</code>
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<code class="bash plain">3.10.0-327.el7.x86_64</code>
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集群节点</p>
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<code class="plain plain">192.168.120.122 kube-master</code>
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<code class="plain plain">192.168.120.123 kube-agent1</code>
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<code class="plain plain">192.168.120.124 kube-agent2</code>
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<code class="plain plain">192.168.120.125 kube-agent3</code>
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即该集群包含一个控制节点和三个工作节点。</p>
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<strong>部署前的准备</strong></p>
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配置可以访问google相关网站</p>
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这种部署方式使用的软件包由google相关源提供，因此集群节点必须能够访问外网，至于如何配置请自行解决。</p>
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关闭防火墙</p>
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<code class="bash comments"># systemctl stop firewalld.service && systemctl disable firewalld.service</code>
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禁用SELinux</p>
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<code class="bash comments"># setenforce 0</code>
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<code class="bash comments"># sed -i.bak 's/SELINUX=enforcing/SELINUX=permissive/' /etc/selinux/config</code>
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配置yum源</p>
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<code class="bash comments"># cat <<EOF > /etc/yum.repos.d/kubernetes.repo</code>
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<code class="bash plain"></code>
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<code class="bash plain">name=Kubernetes</code>
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<code class="bash plain">baseurl=https:</code><code class="bash plain">//packages</code><code class="bash plain">.cloud.google.com</code><code class="bash plain">/yum/repos/kubernetes-el7-x86_64</code>
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<code class="bash plain">enabled=1</code>
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<code class="bash plain">gpgcheck=1</code>
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<code class="bash plain">repo_gpgcheck=1</code>
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<code class="bash plain">gpgkey=https:</code><code class="bash plain">//packages</code><code class="bash plain">.cloud.google.com</code><code class="bash plain">/yum/doc/yum-key</code><code class="bash plain">.gpg</code>
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<code class="bash spaces"> </code><code class="bash plain">https:</code><code class="bash plain">//packages</code><code class="bash plain">.cloud.google.com</code><code class="bash plain">/yum/doc/rpm-package-key</code><code class="bash plain">.gpg</code>
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<code class="bash plain">EOF</code>
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<strong>安装kubelet和kubeadm</strong></p>
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在所有节点上安装以下软件包：</p>
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<code class="bash comments"># yum install -y docker kubelet kubeadm kubectl kubernetes-cni</code>
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<code class="bash comments"># systemctl enable docker && systemctl start docker</code>
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<code class="bash comments"># systemctl enable kubelet && systemctl start kubelet</code>
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然后设置内核参数：</p>
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<code class="bash comments"># sysctl net.bridge.bridge-nf-call-iptables=1</code>
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<code class="bash comments"># sysctl net.bridge.bridge-nf-call-ip6tables=1</code>
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<strong>初始化控制节点</strong></p>
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<code class="bash comments"># kubeadm init --pod-network-cidr=10.244.0.0/16</code>
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因为在该集群中将使用flannel搭建pod网络，因此必须添加–pod-network-cidr参数。</p>
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注意：初始化较慢，因为该过程会pull一些docker image。</p>
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该命令的输出如下：</p>
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<code class="plain plain">Initializing your master...</code>
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<code class="plain plain"> WARNING: kubeadm is in beta, please do not use it for production clusters.</code>
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<code class="plain plain"> Using Kubernetes version: v1.6.4</code>
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<code class="plain plain"> Using Authorization mode: RBAC</code>
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<code class="plain plain"> Running pre-flight checks</code>
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<code class="plain plain"> Generated CA certificate and key.</code>
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<code class="plain plain"> Generated API server certificate and key.</code>
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<code class="plain plain"> API Server serving cert is signed for DNS names and IPs </code>
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<code class="plain plain"> Generated API server kubelet client certificate and key.</code>
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<code class="plain plain"> Generated service account token signing key and public key.</code>
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<code class="plain plain"> Generated front-proxy CA certificate and key.</code>
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<code class="plain plain"> Generated front-proxy client certificate and key.</code>
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<code class="plain plain"> Valid certificates and keys now exist in "/etc/kubernetes/pki"</code>
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<code class="plain plain"> Wrote KubeConfig file to disk: "/etc/kubernetes/admin.conf"</code>
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<code class="plain plain"> Wrote KubeConfig file to disk: "/etc/kubernetes/kubelet.conf"</code>
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<code class="plain plain"> Wrote KubeConfig file to disk: "/etc/kubernetes/controller-manager.conf"</code>
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<code class="plain plain"> Wrote KubeConfig file to disk: "/etc/kubernetes/scheduler.conf"</code>
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<code class="plain plain"> Created API client, waiting for the control plane to become ready</code>
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<code class="plain plain"> All control plane components are healthy after 1377.560339 seconds</code>
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<code class="plain plain"> Waiting for at least one node to register</code>
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<code class="plain plain"> First node has registered after 6.039626 seconds</code>
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<code class="plain plain"> Using token: 60bc68.e94800f3c5c4c2d5</code>
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<code class="plain plain"> Created RBAC rules</code>
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<code class="plain plain"> Created essential addon: kube-proxy</code>
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<code class="plain plain"> Created essential addon: kube-dns</code>
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<code class="plain plain">Your Kubernetes master has initialized successfully!</code>
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<code class="plain plain">To start using your cluster, you need to run (as a regular user):</code>
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<code class="plain spaces"> </code><code class="plain plain">sudo cp /etc/kubernetes/admin.conf $HOME/</code>
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<code class="plain spaces"> </code><code class="plain plain">sudo chown $(id -u):$(id -g) $HOME/admin.conf</code>
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<code class="plain spaces"> </code><code class="plain plain">export KUBECONFIG=$HOME/admin.conf</code>
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<code class="plain plain">You should now deploy a pod network to the cluster.</code>
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<code class="plain plain">Run "kubectl apply -f .yaml" with one of the options listed at: http://kubernetes.io/docs/admin/addons/</code>
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<code class="plain plain">You can now join any number of machines by running the following on each node as root:</code>
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<code class="plain spaces"> </code><code class="plain plain">kubeadm join --token <token> 192.168.120.122:6443</code>
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<p>
观察控制节点的docker image：</p>
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<code class="bash comments"># docker images</code>
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<code class="bash plain">REPOSITORY TAG IMAGE ID CREATED SIZE</code>
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<code class="bash plain">gcr.io</code><code class="bash plain">/google_containers/kube-apiserver-amd64</code> <code class="bash plain">v1.6.4 4e3810a19a64 2 days ago 150.6 MB</code>
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<code class="bash plain">gcr.io</code><code class="bash plain">/google_containers/kube-controller-manager-amd64</code> <code class="bash plain">v1.6.4 0ea16a85ac34 2 days ago 132.8 MB</code>
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<code class="bash plain">gcr.io</code><code class="bash plain">/google_containers/kube-proxy-amd64</code> <code class="bash plain">v1.6.4 e073a55c288b 2 days ago 109.2 MB</code>
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<code class="bash plain">gcr.io</code><code class="bash plain">/google_containers/kube-scheduler-amd64</code> <code class="bash plain">v1.6.4 1fab9be555e1 2 days ago 76.75 MB</code>
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<code class="bash plain">gcr.io</code><code class="bash plain">/google_containers/etcd-amd64</code> <code class="bash plain">3.0.17 243830dae7dd 12 weeks ago 168.9 MB</code>
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<code class="bash plain">gcr.io</code><code class="bash plain">/google_containers/pause-amd64</code> <code class="bash plain">3.0 99e59f495ffa 12 months ago 746.9 kB</code>
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<p>
按照初始化命令的提示执行以下操作：</p>
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<code class="bash comments"># cp /etc/kubernetes/admin.conf $HOME/</code>
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<code class="bash comments"># chown $(id -u):$(id -g) $HOME/admin.conf</code>
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<code class="bash comments"># export KUBECONFIG=$HOME/admin.conf</code>
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<strong>隔离控制节点</strong></p>
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<code class="bash comments"># kubectl taint nodes --all node-role.kubernetes.io/master-</code>
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<code class="bash plain">node </code><code class="bash string">"kube-master"</code> <code class="bash plain">tainted</code>
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<p>
<strong>安装pod网络</strong></p>
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<span>?</span>
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<code class="bash comments"># kubectl apply -f flannel/Documentation/kube-flannel-rbac.yml</code>
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<code class="bash plain">clusterrole </code><code class="bash string">"flannel"</code> <code class="bash plain">created</code>
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<code class="bash plain">clusterrolebinding </code><code class="bash string">"flannel"</code> <code class="bash plain">created</code>
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<code class="bash comments"># kubectl apply -f flannel/Documentation/kube-flannel.yml</code>
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<code class="bash plain">serviceaccount </code><code class="bash string">"flannel"</code> <code class="bash plain">created</code>
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<code class="bash plain">configmap </code><code class="bash string">"kube-flannel-cfg"</code> <code class="bash plain">created</code>
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<code class="bash plain">daemonset </code><code class="bash string">"kube-flannel-ds"</code> <code class="bash plain">created</code>
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可以通过git clone flannel仓库：</p>
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<code class="bash comments"># git clone https://github.com/coreos/flannel.git</code>
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<strong>添加工作节点</strong></p>
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<code class="bash comments"># kubeadm join --token <token> 192.168.120.122:6443</code>
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<p>
该操作输出如下：</p>
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<code class="plain plain"> WARNING: kubeadm is in beta, please do not use it for production clusters.</code>
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<code class="plain plain"> Running pre-flight checks</code>
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<code class="plain plain"> Trying to connect to API Server "192.168.120.122:6443"</code>
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<code class="plain plain"> Created cluster-info discovery client, requesting info from "https://192.168.120.122:6443"</code>
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<code class="plain plain"> Cluster info signature and contents are valid, will use API Server "https://192.168.120.122:6443"</code>
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<code class="plain plain"> Successfully established connection with API Server "192.168.120.122:6443"</code>
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<code class="plain plain"> Detected server version: v1.6.4</code>
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<code class="plain plain"> The server supports the Certificates API (certificates.k8s.io/v1beta1)</code>
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<code class="plain plain"> Created API client to obtain unique certificate for this node, generating keys and certificate signing request</code>
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<code class="plain plain"> Received signed certificate from the API server, generating KubeConfig...</code>
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<code class="plain plain"> Wrote KubeConfig file to disk: "/etc/kubernetes/kubelet.conf"</code>
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<code class="plain plain">Node join complete:</code>
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<code class="plain plain">* Certificate signing request sent to master and response</code>
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<code class="plain spaces"> </code><code class="plain plain">received.</code>
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<code class="plain plain">* Kubelet informed of new secure connection details.</code>
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<code class="plain plain">Run 'kubectl get nodes' on the master to see this machine join.</code>
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<p>
<strong>在控制节点观察集群状态</strong></p>
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<code class="plain plain"># kubectl get nodes</code>
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<code class="plain plain">NAME STATUS AGE VERSION</code>
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<code class="plain plain">kube-agent1 Ready 16m v1.6.3</code>
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<code class="plain plain">kube-agent2 Ready 16m v1.6.3</code>
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<code class="plain plain">kube-agent3 Ready 16m v1.6.3</code>
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<code class="plain plain">kube-master Ready 37m v1.6.3</code>
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<code class="plain plain"># kubectl get pods --all-namespaces -o wide</code>
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<code class="plain plain">NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE</code>
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<code class="plain plain">kube-system etcd-kube-master 1/1 Running 0 32m 192.168.120.122 kube-master</code>
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<code class="plain plain">kube-system kube-apiserver-kube-master 1/1 Running 7 32m 192.168.120.122 kube-master</code>
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<code class="plain plain">kube-system kube-controller-manager-kube-master 1/1 Running 0 32m 192.168.120.122 kube-master</code>
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<code class="plain plain">kube-system kube-dns-3913472980-3x9wh 3/3 Running 0 37m 10.244.0.2 kube-master</code>
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<code class="plain plain">kube-system kube-flannel-ds-1m4wz 2/2 Running 0 18m 192.168.120.122 kube-master</code>
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<code class="plain plain">kube-system kube-flannel-ds-3jwf5 2/2 Running 0 17m 192.168.120.123 kube-agent1</code>
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<code class="plain plain">kube-system kube-flannel-ds-41qbs 2/2 Running 4 17m 192.168.120.125 kube-agent3</code>
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<code class="plain plain">kube-system kube-flannel-ds-ssjct 2/2 Running 4 17m 192.168.120.124 kube-agent2</code>
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<code class="plain plain">kube-system kube-proxy-0mmfc 1/1 Running 0 17m 192.168.120.124 kube-agent2</code>
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<code class="plain plain">kube-system kube-proxy-23vwr 1/1 Running 0 17m 192.168.120.125 kube-agent3</code>
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<code class="plain plain">kube-system kube-proxy-5q8vq 1/1 Running 0 17m 192.168.120.123 kube-agent1</code>
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<code class="plain plain">kube-system kube-proxy-8srwn 1/1 Running 0 37m 192.168.120.122 kube-master</code>
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<code class="plain plain">kube-system kube-scheduler-kube-master 1/1 Running 0 32m 192.168.120.122 kube-master</code>
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<p>
至此，完成Kubernetes集群的部署。</p>
<p>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。</p>
<p>
原文链接：http://blog.csdn.net/u012066426/article/details/72627305</p>
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