搭建k8s

1.所有节点安装Docker

apt-get update && apt-get install docker.io

2.安装kubectl,kubeadm,kubelet

apt-get install -y apt-transport-https
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -

curl -fsSL https://mirrors.aliyun.com/docker-ce/linux/ubuntu/gpg | apt-key add -
curl -fsSL https://mirrors.aliyun.com/kubernetes/apt/doc/apt-key.gpg | apt-key add -

cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
deb http://apt.kubernetes.io/ kubernetes-xenial main
EOF

cat <<EOF >/etc/apt/sources.list.d/docker-k8s.list
deb https://mirrors.aliyun.com/kubernetes/apt/ kubernetes-xenial main
deb [arch=amd64] http://mirrors.aliyun.com/docker-ce/linux/ubuntu $(lsb_release -cs) stable
EOF

apt-get update
apt-get install -y kubelet kubeadm kubectl

 

3.用kubeadm创建cluster

3.1初始化master

在master上执行如下命令：

kubeadm init --image-repository registry.aliyuncs.com/google_containers --apiserver-advertise-address 192.168.197.153 --pod-network-cidr=10.244.0.0/16

注：失败原因1，master虚拟机CPU必须大于等于2核；2.必须关闭交换分区;  swapoff -a;注释掉/etc/fstab 下关于交换分区的行。使用free -m命令查看为0即可

需要从Google官网下载镜像，需要FQ，等待时间略久。

3.2配置kubectl

su - ubuntu
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config 
sudo chown $(id -u):$(id -g)$HOME/.kube/config

使用kubectl命令自动补全功能

echo "source <(kubectl completion bash)" >> ~/.bashrc

 3.3安装pod网络

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

3.4添加k8s-node1和k8s-node2节点

kubeadm join --token nbxxxc.hellowordzwnxxx4lo3  --discovery-token-ca-cert-hash sha256:xxxxxxxxxxxx 192.168.197.153:6443

token可以使用kubeadm token list查看

查看nodes状态

ubuntu@ubuntu:~$ kubectl get nodes
NAME        STATUS   ROLES    AGE    VERSION
k8s-node1   Ready    <none>   44m    v1.18.2
k8s-node2   Ready    <none>   44m    v1.18.2
ubuntu      Ready    master   130m   v1.18.2