Ansible部署k8s集群

安装Ansible

代码语言：javascript复制

# 更换清华源
sudo sed -e 's|^mirrorlist=|#mirrorlist=|g' 
         -e 's|^#baseurl=http://mirror.centos.org|baseurl=https://mirrors.tuna.tsinghua.edu.cn|g' 
         -i.bak 
         /etc/yum.repos.d/CentOS-*.repo
# 更换阿里epel
curl -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
yum -y install vim wget ansible

管理机配置host

代码语言：javascript复制

vim /etc/hosts
172.16.87.100 kubernetes-master
172.16.87.101 kubernetes-node1
172.16.87.102 kubernetes-node2

Ansible添加主机节点

代码语言：javascript复制

vim /etc/ansible/hosts
[k8s_all]
172.16.87.100
172.16.87.101
172.16.87.102

[k8s_master]
172.16.87.100

[k8s_node]
172.16.87.101
172.16.87.102

更改其他主机host

代码语言：javascript复制

vim alter_hosts.yaml
- hosts: k8s_node
  remote_user: root
  tasks:
    - name: backup /etc/hosts
      shell: mv /etc/hosts /etc/host_bak
    - name: copy localhosts file to remote
      copy: src=/etc/hosts dest=/etc/ owner=root group=root mode=0644
ansible-playbook alter_hosts.yaml # 执行命令

更改完成后请重启主机

安装Docker

代码语言：javascript复制

vim install_docker.yaml
- hosts: k8s_all
  remote_user: root
  tasks:
    - name: install dependencies
      yum: state=installed
      args:
        name: ['ntp','yum-utils','device-mapper-persistent-data','lvm2']
    - name: Add docker-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
    - name: Start docker
      shell: systemctl start docker;systemctl enable docker

info.sh

代码语言：javascript复制

#!/bin/bash
# 防火墙
systemctl disable firewalld
systemctl stop firewalld
setenforce 0
sed -i 's/^SELINUX=enforcing$/SELINUX=disabled/' /etc/selinux/config


#禁用swap
swapoff -a
echo "vm.swappiness =0" >> /etc/sysctl.conf

#修改内核参数
modprobe br_netfilter
cat <<EOF >  /etc/sysctl.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 -p

#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

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

# 部署镜像
docker pull bluersw/kube-apiserver:v1.16.2 
docker pull bluersw/kube-controller-manager:v1.16.2
docker pull bluersw/kube-scheduler:v1.16.2
docker pull bluersw/kube-proxy:v1.16.2
docker pull bluersw/pause:3.1
docker pull bluersw/etcd:3.3.15-0
docker pull bluersw/coredns:1.6.2
docker pull bluersw/flannel:v0.11.0-amd64 

# 还原
docker tag bluersw/kube-apiserver:v1.16.2 k8s.gcr.io/kube-apiserver:v1.16.2
docker tag bluersw/kube-controller-manager:v1.16.2 k8s.gcr.io/kube-controller-manager:v1.16.2
docker tag bluersw/kube-scheduler:v1.16.2 k8s.gcr.io/kube-scheduler:v1.16.2
docker tag bluersw/kube-proxy:v1.16.2 k8s.gcr.io/kube-proxy:v1.16.2
docker tag bluersw/pause:3.1 k8s.gcr.io/pause:3.1
docker tag bluersw/etcd:3.3.15-0 k8s.gcr.io/etcd:3.3.15-0
docker tag bluersw/coredns:1.6.2 k8s.gcr.io/coredns:1.6.2
docker tag bluersw/flannel:v0.11.0-amd64 quay.io/coreos/flannel:v0.11.0-amd64
docker images | grep bluersw | awk '{print "docker rmi ",$1":"$2}' | sh -x

deploy_master.yaml

代码语言：javascript复制

- hosts: k8s_master
  remote_user: root
  vars:
    kube_version: 1.16.2
    k8s_version: v1.16.2
    k8s_master: 172.16.87.100
  tasks: 
    - name: Exec Info
      script: ./info.sh
    - name: install Kubernetes
      yum: name={{item}} state=present
      with_items:
        - kubectl-{{kube_version}}
        - kubeadm-{{kube_version}}
        - kubelet-{{kube_version}}
    - name: Init Kubernetes
      shell: kubeadm init  --kubernetes-version={{k8s_version}} --apiserver-advertise-address={{k8s_master}} --pod-network-cidr=10.244.0.0/16 --service-cidr=10.1.0.0/16 --token-ttl 0
    - name: config kube
      shell: mkdir -p $HOME/.kube && cp -i /etc/kubernetes/admin.conf $HOME/.kube/config && chown $(id -u):$(id -g) $HOME/.kube/config
    - name: Apply flannel
      shell: kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml 
    - name: get join command
      shell: kubeadm token create --print-join-command 
      register: join_command
    - name: show join command
      debug: var=join_command verbosity=0

deploy_node.yaml

代码语言：javascript复制

- hosts: k8s_node
  remote_user: root
  vars:
    kube_version: 1.16.2
  tasks:
    - name: Exec Info
      script: ./info.sh
    - name: install Kubernetes
      yum: name={{item}} state=present
      with_items:
        - kubeadm-{{kube_version}}
        - kubelet-{{kube_version}}
    - name: start kubelet
      shell: systemctl enable kubelet && systemctl start kubelet
    - name: join cluster
      shell: kubeadm join 172.16.87.100:6443 --token vwsx61.rxzjukcfdnd2zob2     --discovery-token-ca-cert-hash sha256:cd53a381768b059f822f4d85f21041c73bf9c67e5b4f61eafbdfe6abb9ac65cb

Token：需要到Master查看Ansible返回的执行信息

验证集群

代码语言：javascript复制

[root@kubernetes-master ~]# kubectl get node
NAME                STATUS   ROLES    AGE     VERSION
kubernetes-master   Ready    master   14m     v1.16.2
kubernetes-node1    Ready    <none>   5m1s    v1.16.2
kubernetes-node2    Ready    <none>   6m47s   v1.16.2

DevOps解决方案

0 人点赞