kubernetes环境搭建
节点信息
ip 主机名 角色 操作系统 192.168.157.130 master 主 centeos7.6+ 192.168.157.131 ode1 节点 Centos7.6+ 192.168.157.132 node2 节点 Centos7.6+
- 关闭防火墙相关
systemctl stop firewalld.service systemctl stop iptables.service systemctl disable firewalld.service systemctl disable iptables.service
将 SELinux 设置为 permissive 模式(将其禁用)
setenforce 0 sed -i ‘s/^SELINUX=enforcing$/SELINUX=disabled/‘ /etc/selinux/config
关闭swap
swapoff -a # 永久关闭, 需要注释掉/dev开头的文字 vim /etc/fstab
如下:
UUID=ed95c595-4813-480e-992b-85b1347842e8 / ext4 defaults 1 1 # /dev/vgdata/lvdata /data ext4 defaults 0 0
3. 网桥配置
modprobe br_netfilter cat <<EOF > /etc/sysctl.d/k8s.conf net.bridge.bridge-nf-call-ip6tables = 1 net.bridge.bridge-nf-call-iptables = 1 EOF
使配置生效
sysctl -p /etc/sysctl.d/k8s.conf ls /proc/sys/net/bridge
4. 安装docker
安装基本服务
yum install -y net-tools epel-release vim yum-utils device-mapper-persistent-data lvm2
配置docker和安装docker
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo yum install -y docker-ce-18.06.0.ce systemctl enable docker systemctl start docker cat <<EOF > /etc/docker/daemon.json { "insecure-registries":["0.0.0.0/0"], "exec-opts": ["native.cgroupdriver=systemd"] } EOF systemctl restart docker
5. 安装k8s相关
配置k8syum源
cat <<EOF > /etc/yum.repos.d/kubernetes.repo [kubernetes] name=Kubernetes baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/ enabled=1 gpgcheck=1 repo_gpgcheck=1 gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg EOF
安装kubectl、kubelet、kubenetes-cni、kubeadm
yum install -y kubectl-1.14.1 kubelet-1.14.1 kubernetes-cni-0.7.5 kubeadm-1.14.1
设置开机启动
systemctl enable kubelet
准备k8s 需要的docker 镜像(因为外网原因,不能下载镜像)
cat > pullimages.sh << EOF # 添加如下内容 docker pull mirrorgooglecontainers/kube-apiserver-amd64:v1.14.1 docker pull mirrorgooglecontainers/kube-controller-manager-amd64:v1.14.1 docker pull mirrorgooglecontainers/kube-scheduler-amd64:v1.14.1 docker pull mirrorgooglecontainers/kube-proxy-amd64:v1.14.1 docker pull mirrorgooglecontainers/pause:3.1 docker pull mirrorgooglecontainers/etcd-amd64:3.3.10 docker pull coredns/coredns:1.3.1 docker tag mirrorgooglecontainers/kube-controller-manager-amd64:v1.14.1 k8s.gcr.io/kube-controller-manager:v1.14.1 docker tag mirrorgooglecontainers/kube-scheduler-amd64:v1.14.1 k8s.gcr.io/kube-scheduler:v1.14.1 docker tag mirrorgooglecontainers/kube-apiserver-amd64:v1.14.1 k8s.gcr.io/kube-apiserver:v1.14.1 docker tag mirrorgooglecontainers/kube-proxy-amd64:v1.14.1 k8s.gcr.io/kube-proxy:v1.14.1 docker tag mirrorgooglecontainers/pause:3.1 k8s.gcr.io/pause:3.1 docker tag mirrorgooglecontainers/etcd-amd64:3.3.10 k8s.gcr.io/etcd:3.3.10 docker tag coredns/coredns:1.3.1 k8s.gcr.io/coredns:1.3.1 docker rmi mirrorgooglecontainers/kube-apiserver-amd64:v1.14.1 docker rmi mirrorgooglecontainers/kube-controller-manager-amd64:v1.14.1 docker rmi mirrorgooglecontainers/kube-scheduler-amd64:v1.14.1 docker rmi mirrorgooglecontainers/kube-proxy-amd64:v1.14.1 docker rmi mirrorgooglecontainers/pause:3.1 docker rmi mirrorgooglecontainers/etcd-amd64:3.3.10 docker rmi coredns/coredns:1.3.1 EOF # 执行脚本 sh pullimages.sh
6. 主节点初始化
集群初始化(请记录初始化最后打印出的kubeadm join 信息)(IP根据实际情况修改)
kubeadm init --kubernetes-version=v1.14.1 --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=`ifconfig eth0 |awk ‘{print $2}‘|sed -n "2,1p"` 记录: kubeadm join ${IP_ADDRESS}:6443 --token p2f3ud.l44djf21s0nj7a5y --discovery-token-ca-cert-hash sha256:866d6131855e1847bcec7481a184b42ea8616bbe95a9ffcf8dfcc64cdb38a905 # 复制配置 mkdir ~/.kube cp -i /etc/kubernetes/admin.conf ~/.kube/config chown $(id -u):$(id -g) ~/.kube/config
7. 主节点配置flannel网络
wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml kubectl apply -f kube-flannel.yml
使 master 节点参与工作负载
kubectl describe node | grep Taint kubectl taint nodes --all node-role.kubernetes.io/master-
8. 子节点加入集群
注意: 【子节点执行】子节点加入集群(IP根据实际情况修改)
kubeadm join ${IP_ADDRESS}:6443 --token p2f3ud.l44djf21s0nj7a5y --discovery-token-ca-cert-hash sha256:866d6131855e1847bcec7481a184b42ea8616bbe95a9ffcf8dfcc64cdb38a905 # 确认日志无报错 # 复制配置 mkdir ~/.kube 拷贝主节点的 ~/.kube/config 到 ~/.kube(命令:scp -r ${IP_ADDRESS}:/root/.kube/config ~/.kube/) chown $(id -u):$(id -g) ~/.kube/config # 在主节点查询 Ready 说明节点加入集群正常 kubectl get nodes
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