kubernetes系列01-1.18.2集群安装
一、基础配置
修改主机名
# 在 172.17.32.23 上: hostnamectl set-hostname k8s-master01 bash # 在 172.17.32.38 上: hostnamectl set-hostname k8s-master02 bash # 在 172.17.32.43 上: hostnamectl set-hostname k8s-master03 bash # 在 172.17.32.32 上: hostnamectl set-hostname k8s-node01 bash
配置hosts解析
各个节点操作
cat <<EOF >>/etc/hosts 172.17.32.23 k8s-master01 172.17.32.38 k8s-master02 172.17.32.43 k8s-master03 172.17.32.32 k8s-node01 EOF echo "127.0.0.1 $(hostname)" >> /etc/hosts
二、安装docker
创建文件存放目录
mkdir /application cat /application/install-docker.sh #!/bin/bash # 在 master 节点和 worker 节点都要执行 # 安装 docker # 参考文档如下 # https://docs.docker.com/install/linux/docker-ce/centos/ # https://docs.docker.com/install/linux/linux-postinstall/ # 卸载旧版本 yum remove -y docker \ docker-client \ docker-client-latest \ docker-ce-cli \ docker-common \ docker-latest \ docker-latest-logrotate \ docker-logrotate \ docker-selinux \ docker-engine-selinux \ docker-engine # 设置 yum repository yum install -y yum-utils \ device-mapper-persistent-data \ lvm2 yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo # 安装并启动 docker yum install -y docker-ce-19.03.11 docker-ce-cli-19.03.11 containerd.io-1.2.13 mkdir /etc/docker || true cat > /etc/docker/daemon.json <<EOF { "registry-mirrors": ["https://registry.cn-hangzhou.aliyuncs.com"], "exec-opts": ["native.cgroupdriver=systemd"], "log-driver": "json-file", "log-opts": { "max-size": "100m" }, "storage-driver": "overlay2", "storage-opts": [ "overlay2.override_kernel_check=true" ] } EOF mkdir -p /etc/systemd/system/docker.service.d # Restart Docker systemctl daemon-reload systemctl enable docker systemctl restart docker # 安装 nfs-utils # 必须先安装 nfs-utils 才能挂载 nfs 网络存储 yum install -y nfs-utils yum install -y wget # 关闭 防火墙 systemctl stop firewalld systemctl disable firewalld # 关闭 SeLinux setenforce 0 sed -i "s/SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config # 关闭 swap swapoff -a yes | cp /etc/fstab /etc/fstab_bak cat /etc/fstab_bak |grep -v swap > /etc/fstab # 修改 /etc/sysctl.conf # 如果有配置,则修改 sed -i "s#^net.ipv4.ip_forward.*#net.ipv4.ip_forward=1#g" /etc/sysctl.conf sed -i "s#^net.bridge.bridge-nf-call-ip6tables.*#net.bridge.bridge-nf-call-ip6tables=1#g" /etc/sysctl.conf sed -i "s#^net.bridge.bridge-nf-call-iptables.*#net.bridge.bridge-nf-call-iptables=1#g" /etc/sysctl.conf sed -i "s#^net.ipv6.conf.all.disable_ipv6.*#net.ipv6.conf.all.disable_ipv6=1#g" /etc/sysctl.conf sed -i "s#^net.ipv6.conf.default.disable_ipv6.*#net.ipv6.conf.default.disable_ipv6=1#g" /etc/sysctl.conf sed -i "s#^net.ipv6.conf.lo.disable_ipv6.*#net.ipv6.conf.lo.disable_ipv6=1#g" /etc/sysctl.conf sed -i "s#^net.ipv6.conf.all.forwarding.*#net.ipv6.conf.all.forwarding=1#g" /etc/sysctl.conf # 可能没有,追加 echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.conf echo "net.bridge.bridge-nf-call-ip6tables = 1" >> /etc/sysctl.conf echo "net.bridge.bridge-nf-call-iptables = 1" >> /etc/sysctl.conf echo "net.ipv6.conf.all.disable_ipv6 = 1" >> /etc/sysctl.conf echo "net.ipv6.conf.default.disable_ipv6 = 1" >> /etc/sysctl.conf echo "net.ipv6.conf.lo.disable_ipv6 = 1" >> /etc/sysctl.conf echo "net.ipv6.conf.all.forwarding = 1" >> /etc/sysctl.conf # 执行命令以应用 sysctl -p # 配置K8S的yum源 cat <<EOF > /etc/yum.repos.d/kubernetes.repo [kubernetes] name=Kubernetes baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64 enabled=1 gpgcheck=0 repo_gpgcheck=0 gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg EOF # 卸载旧版本 yum remove -y kubelet kubeadm kubectl # 安装kubelet、kubeadm、kubectl # 将 ${1} 替换为 kubernetes 版本号,例如 1.19.0 # yum install -y kubelet-${1} kubeadm-${1} kubectl-${1} # 重启 docker,并启动 kubelet systemctl daemon-reload systemctl restart docker # systemctl enable kubelet && systemctl start kubelet docker version
执行安装docker
sh /application/install-docker.sh
三、安装 kubenetes 1.18.2
在 master01 master02 master03 node01 上安装kubeadm 和 kubelet
yum install kubeadm-1.18.2 kubelet-1.18.2 -y systemctl enable kubelet systemctl restart kubelet
安装各个组件
pause版本是3.2,用到的镜像是k8s.gcr.io/pause:3.2
etcd版本是3.4.3,用到的镜像是k8s.gcr.io/etcd:3.4.3-0
cordns版本是1.6.7,用到的镜像是k8s.gcr.io/coredns:1.6.7
apiserver、scheduler、controller-manager、kube-proxy版本是1.18.2,用到的镜像分别是 :
k8s.gcr.io/kube-apiserver:v1.18.2
k8s.gcr.io/kube-controller-manager:v1.18.2
k8s.gcr.io/kube-scheduler:v1.18.2
k8s.gcr.io/kube-proxy:v1.18.2
【说明:每一个master节点上都需要安装】
安装包百度盘:链接:https://pan.baidu.com/s/1WI-6pFzSWL5gCNxMXL6ykQ 提取码:bwen 解压
docker load -i <image_name>.tar.gz # 全部解压
在这里所有master节点的镜像信息为以下:
初始化ApiServer
初始化ApiServer的Load Balance(私网)
监听端口:6443/TCP
后端资源组:k8s-master01,k8s-master02,k8s-master03
后端端口:6443
开启 按源地址保持会话
Load Balance 可以的选择有
-
nginx
-
haproxy
-
keepalived
-
云厂商提供的负载均衡产品
【注意:在这里我们使用的是云主机,我们使用腾讯云的CLB负载均衡产品】
-
购买内网云负载均衡
-
进行配置
初始化第一个master节点
# 只在第一个master上执行 # 替换apiserver.demo 为你想要的dnsName,也可以直接使用apiserver.demo export APISERVER_NAME=apiserver.demo # Kubernetes 容器组所在的网段,该网段安装完成后,由 kubernetes 创建,事先并不存在于您的物理网络中 export POD_SUBNET=10.244.0.1/16 echo "127.0.0.1 ${APISERVER_NAME}" >> /etc/hosts # 配置 kubeadm 文件 cat <<EOF > /application/kubeadm-config.yaml apiVersion: kubeadm.k8s.io/v1beta2 kind: ClusterConfiguration kubernetesVersion: v1.18.2 imageRepository: registry.cn-hangzhou.aliyuncs.com/google_containers controlPlaneEndpoint: "apiserver.demo:6443" networking: serviceSubnet: "10.96.0.0/16" podSubnet: "10.244.0.0/16" dnsDomain: "cluster.local" EOF # 初始化 k8s 集群 cd /application kubeadm init --config kubeadm-config.yaml # 出现 Your Kubernetes control-plane has initialized successfully! 成功
授权操作k8s资源
# 在master01上执行 mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config
安装calico网络插件
安装calico需要的镜像有:
quay.io/calico/cni:v3.9.2 quay.io/calico/kube-controllers:v3.9.2 quay.io/calico/pod2daemon-flexvol:v3.9.2 quay.io/calico/node:v3.5.3
还有需要的calico-3.9.2.yaml文件也在网盘
百度网盘:链接:https://pan.baidu.com/s/1yZ4OiJEf_Mi4USW3pjmc2g 提取码:bwen
cd /application/ # 将calico-3.9.2.yaml文件传入 sed -i "s#192\.168\.0\.0/16#${POD_SUBNET}#" calico-3.9.2.yaml kubectl apply -f /application/calico-3.9.2.yaml
拷贝证书
将 master01 上面的文件拷贝到 master02 和 master03 上
# 在 master02 和 master 03 上执行 cd /root && mkdir -p /etc/kubernetes/pki/etcd &&mkdir -p ~/.kube/ # 把 master01 上面的证书复制到 master02 和 master03 上 scp /etc/kubernetes/pki/ca.crt k8s-master02:/etc/kubernetes/pki/ scp /etc/kubernetes/pki/ca.key k8s-master02:/etc/kubernetes/pki/ scp /etc/kubernetes/pki/sa.key k8s-master02:/etc/kubernetes/pki/ scp /etc/kubernetes/pki/sa.pub k8s-master02:/etc/kubernetes/pki/ scp /etc/kubernetes/pki/front-proxy-ca.crt k8s-master02:/etc/kubernetes/pki/ scp /etc/kubernetes/pki/front-proxy-ca.key k8s-master02:/etc/kubernetes/pki/ scp /etc/kubernetes/pki/etcd/ca.crt k8s-master02:/etc/kubernetes/pki/etcd/ scp /etc/kubernetes/pki/etcd/ca.key k8s-master02:/etc/kubernetes/pki/etcd/ scp /etc/kubernetes/pki/ca.crt k8s-master03:/etc/kubernetes/pki/ scp /etc/kubernetes/pki/ca.key k8s-master03:/etc/kubernetes/pki/ scp /etc/kubernetes/pki/sa.key k8s-master03:/etc/kubernetes/pki/ scp /etc/kubernetes/pki/sa.pub k8s-master03:/etc/kubernetes/pki/ scp /etc/kubernetes/pki/front-proxy-ca.crt k8s-master03:/etc/kubernetes/pki/ scp /etc/kubernetes/pki/front-proxy-ca.key k8s-master03:/etc/kubernetes/pki/ scp /etc/kubernetes/pki/etcd/ca.crt k8s-master03:/etc/kubernetes/pki/etcd/ scp /etc/kubernetes/pki/etcd/ca.key k8s-master03:/etc/kubernetes/pki/etcd/
初始化其他master节点
# 在 master01 上执行 kubeadm init phase upload-certs --upload-certs # 获得以下内容: # [upload-certs] Using certificate key: # baac735689ed0d0fcae1dc4cddcafcaba63bf33787307017e4719e4999abe84f # 在 master01 上执行 kubeadm token create --print-join-command # 获得以下内容 # kubeadm join apiserver.demo:6443 --token 80cvwb.aiu7v5svs411ilc6 --discovery-token-ca-cert-hash sha256:2283acdd1b0bd3a3d92fcff7675860518eefa96434329382f3d49ea2a717ff53 # 【刚刚获得了 key 和 join 命令】 # ===============初始化第二,三个master节点================ # 替换172.17.64.13为你的 apiserver loadbalance地址ip export APISERVER_IP=172.17.64.13 # 替换 apiserver.demo 为 前面已经使用的 dnsName export APISERVER_NAME=apiserver.demo echo "${APISERVER_IP} ${APISERVER_NAME}" >> /etc/hosts # master02 和 master01 加入 kubeadm join apiserver.demo:6443 --token 80cvwb.aiu7v5svs411ilc6 --discovery-token-ca-cert-hash sha256:2283acdd1b0bd3a3d92fcff7675860518eefa96434329382f3d49ea2a717ff53 --control-plane --certificate-key baac735689ed0d0fcae1dc4cddcafcaba63bf33787307017e4719e4999abe84f # 在 master02 和 master03 上执行 mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config
检查apiserver.demo:6443
curl -ik https://apiserver.demo:6443/version # 返回 200
初始化node节点
# 只在 worker 节点执行 # 替换 x.x.x.x 为 ApiServer LoadBalancer 的 IP 地址 export MASTER_IP=172.17.64.13 # 替换 apiserver.demo 为初始化 master 节点时所使用的 APISERVER_NAME export APISERVER_NAME=apiserver.demo echo "${MASTER_IP} ${APISERVER_NAME}" >> /etc/hosts # 加入 work 节点 kubeadm join apiserver.demo:6443 --token 80cvwb.aiu7v5svs411ilc6 --discovery-token-ca-cert-hash sha256:2283acdd1b0bd3a3d92fcff7675860518eefa96434329382f3d49ea2a717ff53
解决node节点无法使用kubectl命令
# master01节点上执行 scp /etc/kubernetes/admin.conf k8s-node01:/etc/kubernetes/ # node节点上执行 mkdir -p $HOME/.kube sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config sudo chown $(id -u):$(id -g) $HOME/.kube/config
最终结果
本文来自博客园,作者:子禾org,转载请注明原文链接:https://www.cnblogs.com/ic-wen/p/13959923.html