k8s kubeadmin 安装

[[email protected] ~]# cat pre-setup.sh 
#!/bin/bash

#关闭防火墙
systemctl disable firewalld
systemctl stop firewalld

#关闭selinux
setenforce 0
#永久关闭
sed -i "s/SELINUX=enforcing/SELINUX=disabled/" /etc/sysconfig/selinux
sed -i "s/SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config

#禁用swap
swapoff -a
#永久禁用
sed -i "s/.*swap.*/#&/" /etc/fstab

#修改内核参数
cat <<EOF >  /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF

#重新加载配置文件
sysctl --system

#配置阿里k8s yum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
#修改文件句柄限制
echo "* soft nofile 65536" >> /etc/security/limits.conf
echo "* hard nofile 65536" >> /etc/security/limits.conf
echo "* soft nproc 65536"  >> /etc/security/limits.conf
echo "* hard nproc 65536"  >> /etc/security/limits.conf
echo "* soft  memlock  unlimited"  >> /etc/security/limits.conf
echo "* hard memlock  unlimited"  >> /etc/security/limits.conf

#更新缓存
yum clean all -y && yum makecache -y && yum repolist -y





#ansible 主机
# /etc/hosts 
10.12.12.181 node1
10.12.12.182 node2
10.12.12.183 node3

#[[email protected] ansible]# cat /etc/ansible/hosts  | tail -15

[k8s-all]
node1
node2
node3

[k8s-master]
node1

[k8s-nodes]
node2
node3



[[email protected] roles]# cat set_hosts_playbook.yml 
---
- hosts: k8s-all
  remote_user: root
  
  tasks:
    - name: backup /etc/hosts
      shell: mv /etc/hosts /etc/hosts_bak

    - name: copy local hosts file to remote
      copy: src=/etc/hosts dest=/etc/ owner=root group=root mode=0644 

#安装docker
[[email protected] roles]# cat install_docker_playbook.yml 
- hosts: k8s-all
  remote_user: root
  vars: 
     docker_version: 18.09.2

  tasks: 
     - name: install dependencies
       #shell: yum install -y yum-utils device-mapper-persistent-data lvm2 
       yum: name={{item}} state=present
       with_items:
          - yum-utils
          - device-mapper-persistent-data
          - lvm2

     - name: config yum repo
       shell: yum-config-manager --add-repo https://mirrors.ustc.edu.cn/docker-ce/linux/centos/docker-ce.repo

     - name: install docker
       yum: name=docker-ce-{{docker_version}} state=present

     - name: start docker
       shell: systemctl enable docker && systemctl start docker



#全部执行
yum install -y kubelet-1.20.4 kubeadm-1.20.4 kubectl-1.20.4

#master执行
kubeadm init \
--apiserver-advertise-address=10.12.12.181 \
--image-repository registry.aliyuncs.com/google_containers \
--kubernetes-version v1.20.4 \
--service-cidr=10.96.0.0/12 \
--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

#node 执行
kubeadm join 10.12.12.181:6443 --token wfmgv4.cimd9aasqdsaevsq \
    --discovery-token-ca-cert-hash sha256:1629bdec040253728571c274b86ca8ba4cc1f04142758521ec93de34ab3c5046 

#需要安装网络插件
[[email protected] ~]# kubectl get node
NAME    STATUS     ROLES                  AGE     VERSION
node1   NotReady   control-plane,master   2m31s   v1.20.4
node2   NotReady   <none>                 57s     v1.20.4
node3   NotReady   <none>                 41s     v1.20.4

[[email protected] ~]# kubectl apply -f kube-flannel.yaml 


[[email protected] ~]# kubectl get pod -A
NAMESPACE     NAME                            READY   STATUS    RESTARTS   AGE
kube-system   coredns-7f89b7bc75-9gjrx        0/1     Pending   0          4m16s
kube-system   coredns-7f89b7bc75-f6j8n        0/1     Pending   0          4m16s
kube-system   etcd-node1                      1/1     Running   0          4m31s
kube-system   kube-apiserver-node1            1/1     Running   0          4m31s
kube-system   kube-controller-manager-node1   1/1     Running   0          4m31s
kube-system   kube-flannel-ds-amd64-2z8rw     1/1     Running   0          29s
kube-system   kube-flannel-ds-amd64-4pmhj     1/1     Running   0          29s
kube-system   kube-flannel-ds-amd64-vqwwk     1/1     Running   0          29s
kube-system   kube-proxy-562gr                1/1     Running   0          3m5s
kube-system   kube-proxy-6q6p9                1/1     Running   0          4m16s
kube-system   kube-proxy-t5bkd                1/1     Running   0          2m50s
kube-system   kube-scheduler-node1            1/1     Running   0          4m31s
[[email protected] ~]# kubectl get node
NAME    STATUS   ROLES                  AGE     VERSION
node1   Ready    control-plane,master   4m50s   v1.20.4
node2   Ready    <none>                 3m16s   v1.20.4
node3   Ready    <none>                 3m      v1.20.4

#dns 没起来 重启下
kubectl delete pod/coredns-7f89b7bc75-f6j8n -n kube-system

[[email protected] ~]# kubectl get pod -A
NAMESPACE     NAME                            READY   STATUS    RESTARTS   AGE
kube-system   coredns-7f89b7bc75-9gjrx        1/1     Running   0          6m3s
kube-system   coredns-7f89b7bc75-bkj2k        1/1     Running   0          15s
kube-system   etcd-node1                      1/1     Running   0          6m18s
kube-system   kube-apiserver-node1            1/1     Running   0          6m18s
kube-system   kube-controller-manager-node1   1/1     Running   0          6m18s
kube-system   kube-flannel-ds-amd64-2z8rw     1/1     Running   0          2m16s
kube-system   kube-flannel-ds-amd64-4pmhj     1/1     Running   0          2m16s
kube-system   kube-flannel-ds-amd64-vqwwk     1/1     Running   0          2m16s
kube-system   kube-proxy-562gr                1/1     Running   0          4m52s
kube-system   kube-proxy-6q6p9                1/1     Running   0          6m3s
kube-system   kube-proxy-t5bkd                1/1     Running   0          4m37s
kube-system   kube-scheduler-node1            1/1     Running   0          6m18s