简化执行步骤
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huanqing.shao
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@ -20,8 +20,8 @@
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对于 Kubernetes 初学者，推荐在阿里云采购如下配置：
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* 3台 2核4G 的ECS（突发性能实例 t5 ecs.t5-c1m2.large或同等配置，单台约 0.4元/小时，停机时不收费）
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* Cent OS 7.6
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* 3台 **2核4G** 的ECS（突发性能实例 t5 ecs.t5-c1m2.large或同等配置，单台约 0.4元/小时，停机时不收费）
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* **Cent OS 7.6**
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[领取阿里云最高2000元红包](https://promotion.aliyun.com/ntms/yunparter/invite.html?userCode=obezo3pg)
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@ -29,12 +29,11 @@
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Kuboard 的 Live Demo 环境使用的是如下拓扑结构，本文档描述了如何在完成该 demo 环境的搭建。
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按照本文档完成安装后，对应的软件版本为：
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* Kubernetes v1.15.2
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* Docker 18.09.7
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如果要安装 Kubernetes 历史版本，请参考：
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* [安装 Kubernetes 1.15.1 单Master节点](./history-k8s/install-k8s-1.15.1.html)
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> 如果要安装 Kubernetes 历史版本，请参考：
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> * [安装 Kubernetes 1.15.1 单Master节点](./history-k8s/install-k8s-1.15.1.html)
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@ -61,7 +60,7 @@ Kuboard 的 Live Demo 环境使用的是如下拓扑结构，本文档描述了
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- docker
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- nfs-utils
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- kubernetes images
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- kubectl / kubeadm / kubelet
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::: tip
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* 您也可以不制作标准机镜像，而是在三台机器上都执行 ***制作标准机镜像*** 中的所有操作步骤
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@ -71,7 +70,7 @@ Kuboard 的 Live Demo 环境使用的是如下拓扑结构，本文档描述了
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### 安装docker
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将下列代码行（包括 #及其后的备注）一次性拷贝到命令行终端执行
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将以下代码框中所有内容（包括 #及其后的备注）一次性拷贝到 centos 命令行终端执行
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``` sh
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# 在 master 节点和 worker 节点都要执行
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@ -92,9 +91,8 @@ docker-engine
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sudo yum install -y yum-utils \
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device-mapper-persistent-data \
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lvm2
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sudo yum-config-manager \
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--add-repo \
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https://download.docker.com/linux/centos/docker-ce.repo
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sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
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# 安装并启动 docker
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@ -131,12 +129,38 @@ sudo yum install -y nfs-utils
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### K8S基本配置
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**配置K8S的yum源**
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### 安装 kubectl / kubeadm / kubelet
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将以下代码框中所有内容（包括 #及其后的备注）一次性拷贝到 centos 命令行终端执行
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``` sh
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# 在 master 节点和 worker 节点都要执行
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# 关闭 防火墙
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systemctl stop firewalld
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systemctl disable firewalld
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# 关闭 SeLinux
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setenforce 0
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sed -i "s/SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config
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# 关闭 swap
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swapoff -a
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yes | cp /etc/fstab /etc/fstab_bak
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cat /etc/fstab_bak |grep -v swap > /etc/fstab
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# 修改 /etc/sysctl.conf
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# 如果有配置，则修改
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sed -i "s#^net.ipv4.ip_forward.*#net.ipv4.ip_forward=1#g" /etc/sysctl.conf
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sed -i "s#^net.bridge.bridge-nf-call-ip6tables.*#net.bridge.bridge-nf-call-ip6tables=1#g" /etc/sysctl.conf
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sed -i "s#^net.bridge.bridge-nf-call-iptables.*#net.bridge.bridge-nf-call-iptables=1#g" /etc/sysctl.conf
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# 可能没有，追加
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echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.conf
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echo "net.bridge.bridge-nf-call-ip6tables = 1" >> /etc/sysctl.conf
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echo "net.bridge.bridge-nf-call-iptables = 1" >> /etc/sysctl.conf
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# 执行命令以应用
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sysctl -p
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# 配置K8S的yum源
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cat <<EOF > /etc/yum.repos.d/kubernetes.repo
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[kubernetes]
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name=Kubernetes
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@ -147,100 +171,28 @@ repo_gpgcheck=0
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gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
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http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
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EOF
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```
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**关闭 防火墙、SeLinux、swap**
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``` sh
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# 在 master 节点和 worker 节点都要执行
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systemctl stop firewalld
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systemctl disable firewalld
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setenforce 0
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sed -i "s/SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config
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swapoff -a
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yes | cp /etc/fstab /etc/fstab_bak
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cat /etc/fstab_bak |grep -v swap > /etc/fstab
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```
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**修改 /etc/sysctl.conf**
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``` sh
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# 在 master 节点和 worker 节点都要执行
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vim /etc/sysctl.conf
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```
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向其中添加
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```
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net.ipv4.ip_forward = 1
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net.bridge.bridge-nf-call-ip6tables = 1
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net.bridge.bridge-nf-call-iptables = 1
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```
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如下图所示
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执行命令以应用
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```sh
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# 在 master 节点和 worker 节点都要执行
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sysctl -p
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```
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**安装kubelet、kubeadm、kubectl**
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``` sh
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# 在 master 节点和 worker 节点都要执行
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# 安装kubelet、kubeadm、kubectl
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yum install -y kubelet-1.15.2 kubeadm-1.15.2 kubectl-1.15.2
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```
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# 修改docker Cgroup Driver为systemd
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# # 将/usr/lib/systemd/system/docker.service文件中的这一行 ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
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# # 修改为 ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock --exec-opt native.cgroupdriver=systemd
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# 如果不修改，在添加 worker 节点时可能会碰到如下错误
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# [WARNING IsDockerSystemdCheck]: detected "cgroupfs" as the Docker cgroup driver. The recommended driver is "systemd".
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# Please follow the guide at https://kubernetes.io/docs/setup/cri/
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sed -i "s#^ExecStart=/usr/bin/dockerd.*#ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock --exec-opt native.cgroupdriver=systemd#g" /usr/lib/systemd/system/docker.service
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**修改docker Cgroup Driver为systemd**
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> 如果不修改，在添加 worker 节点时可能会碰到如下错误
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> ```
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> [WARNING IsDockerSystemdCheck]: detected "cgroupfs" as the Docker cgroup driver. The recommended driver is "systemd".
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> Please follow the guide at https://kubernetes.io/docs/setup/cri/
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> ```
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``` sh
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# 在 master 节点和 worker 节点都要执行
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vim /usr/lib/systemd/system/docker.service
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```
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向其中添加
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```
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--exec-opt native.cgroupdriver=systemd
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```
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如下图所示
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**设置 docker 镜像**
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执行以下命令使用 docker 国内镜像，提高 docker 镜像下载速度和稳定性
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> 如果您访问 https://hub.docker.io 速度非常稳定，亦可以跳过这个步骤
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``` sh
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# 在 master 节点和 worker 节点都要执行
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# 设置 docker 镜像，提高 docker 镜像下载速度和稳定性
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# 如果您访问 https://hub.docker.io 速度非常稳定，亦可以跳过这个步骤
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curl -sSL https://get.daocloud.io/daotools/set_mirror.sh | sh -s http://f1361db2.m.daocloud.io
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```
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**重启 docker，并启动 kubelet**
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``` sh
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# 在 master 节点和 worker 节点都要执行
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# 重启 docker，并启动 kubelet
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systemctl daemon-reload
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systemctl restart docker
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systemctl enable kubelet && systemctl start kubelet
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```
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@ -287,7 +239,7 @@ EOF
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::: tip
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podSubnet 所使用的网段不能与 ***master节点/worker节点*** 所在的网段重叠
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该字段的取值为一个 <a href="/glossary/cidr.html" target="_blank">CIDR</a> 值，只要您的网络环境里没有使用 10.100.0.1/20 这个网段，该字段无需修改
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该字段的取值为一个 <a href="/glossary/cidr.html" target="_blank">CIDR</a> 值，如果您对 CIDR 这个概念还不熟悉，请不要修改这个字段的取值 10.100.0.1/20
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:::
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@ -302,9 +254,36 @@ kubeadm init --config=kubeadm-config.yaml --upload-certs
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根据您服务器网速的情况，您需要等候 3 - 10 分钟
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:::
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执行结果如下图所示：
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执行结果如下所示：
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```
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Your Kubernetes control-plane has initialized successfully!
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To start using your cluster, you need to run the following as a regular user:
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mkdir -p $HOME/.kube
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sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
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sudo chown $(id -u):$(id -g) $HOME/.kube/config
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You should now deploy a pod network to the cluster.
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Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
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https://kubernetes.io/docs/concepts/cluster-administration/addons/
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You can now join any number of the control-plane node running the following command on each as root:
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kubeadm join apiserver.demo:6443 --token scr6kj.zs3gytymi1o7m5w9 \
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--discovery-token-ca-cert-hash sha256:5251852954b73f10afd12a9f0c6f0b379a46c6a4524d2cbcd528fe869bf88330 \
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--control-plane --certificate-key b2dda6524c22db801c18e03b613a6ba8480f868d8187b5b6d11f57d112268368
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Please note that the certificate-key gives access to cluster sensitive data, keep it secret!
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As a safeguard, uploaded-certs will be deleted in two hours; If necessary, you can use
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"kubeadm init phase upload-certs --upload-certs" to reload certs afterward.
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Then you can join any number of worker nodes by running the following on each as root:
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kubeadm join apiserver.demo:6443 --token scr6kj.zs3gytymi1o7m5w9 \
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--discovery-token-ca-cert-hash sha256:5251852954b73f10afd12a9f0c6f0b379a46c6a4524d2cbcd528fe869bf88330
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```
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@ -336,7 +315,7 @@ kubectl apply -f https://docs.projectcalico.org/v3.6/getting-started/kubernetes/
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``` sh
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# 只在 master 节点执行
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watch kubectl get pod -n kube-system
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watch kubectl get pod -n kube-system -o wide
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```
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@ -395,8 +374,14 @@ kubeadm join apiserver.demo:6443 --token mpfjma.4vjjg8flqihor4vt --discovery
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# 只在 master 节点执行
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kubectl get nodes
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```
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输出结果如下所示：
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```sh
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[root@demo-master-a-1 ~]# kubectl get nodes
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NAME STATUS ROLES AGE VERSION
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demo-master-a-1 Ready master 5m3s v1.15.2
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demo-worker-a-1 Ready <none> 2m26s v1.15.2
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demo-worker-a-2 Ready <none> 3m56s v1.15.2
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```
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