centos7安装kubenetes

3台主机

k8s-master  192.168.0.60

k8s-node1   192.168.0.164

k8s-node2   192.168.0.148

1. 修改hosts文件

vim /etc/hosts

k8s-master  192.168.0.60

k8s-node1   192.168.0.164

k8s-node2   192.168.0.148

2. 关闭selinux

setenforce 0

vim /etc/sysconfig/selinux
SELINUX=disabled

3. 关闭防火墙

systemctl disable firewalld && systemctl stop firewalld

4. 关闭swap虚拟内存

swapoff -a 
sed -i.bak '/swap/s/^ /#/' /etc/fstab

5. 免秘钥登录

ssh-keygen -t rsa  # 一路回车
ssh-copy-id -i /root/.ssh/id_rsa.pub root@k8s-node1
ssh-copy-id -i /root/.ssh/id_rsa.pub root@k8s-node2
ssh k8s-node1   # 测试一下
ssh k8s-node2

6. 安装docker

yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
yum makecache fast
yum -y install docker-ce
systemctl enable docker && systemctl start docker 
docker version

cat /etc/docker/daemon.json    # 设置加速镜像
{
"registry-mirrors": ["https://你自己的.mirror.aliyuncs.com"]
}

7. 安装补全命令

yum -y install bash-completion
source /etc/profile.d/bash_completion.sh

8. 创建k8s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

9. 安装k8s组件

yum install -y kubelet kubeadm kubectl
systemctl enable kubelet && systemctl start kubelet

10. k8s命令补全

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

11. 修改内核参数

sysctl net.bridge.bridge-nf-call-iptables=1
sysctl net.bridge.bridge-nf-call-ip6tables=1
cat <<EOF >  /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl -p /etc/sysctl.d/k8s.conf

12. 初始化k8s集群

kubeadm init --kubernetes-version=1.18.0  
--apiserver-advertise-address=192.168.0.60   
--image-repository registry.aliyuncs.com/google_containers  
--pod-network-cidr=10.244.0.0/16

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

13. 安装calico网络

 kubectl apply -f https://docs.projectcalico.org/manifests/calico.yaml

14. node节点初始化  (master节点初始化时,回显的token及完整命令)

kubeadm join 192.168.0.60:6443 --token zfoq9s.ybcnch8fc7auq9mg   
  --discovery-token-ca-cert-hash sha256:80890672385e282b74ed22fef0b66fb70dd2c9b31f35360830bb69075910604b

如token超过24小时后失效,可用以下命令生成token 替换原来的

kubeadm token create