(第二篇)ansible-kubeadm在线安装单master集群

ansible可以安装的KS8版本如下：

请按照此博客中的内容操作后，才可以通过下面的命令查询到版本。

[root@k8s-master01 ~]# yum list kubectl --showduplicates | sort -r 
kubectl.x86_64                       1.20.0-0                        kubernetes 
kubectl.x86_64                       1.20.0-0                        @kubernetes
kubectl.x86_64                       1.19.9-0                        kubernetes 
kubectl.x86_64                       1.19.8-0                        kubernetes 
kubectl.x86_64                       1.19.7-0                        kubernetes 
kubectl.x86_64                       1.19.6-0                        kubernetes 
kubectl.x86_64                       1.19.5-0                        kubernetes 
kubectl.x86_64                       1.19.4-0                        kubernetes 
kubectl.x86_64                       1.19.3-0                        kubernetes 
kubectl.x86_64                       1.19.2-0                        kubernetes 
kubectl.x86_64                       1.19.16-0                       kubernetes 
kubectl.x86_64                       1.19.15-0                       kubernetes 
kubectl.x86_64                       1.19.14-0                       kubernetes 
kubectl.x86_64                       1.19.13-0                       kubernetes 
kubectl.x86_64                       1.19.12-0                       kubernetes 
kubectl.x86_64                       1.19.11-0                       kubernetes 
kubectl.x86_64                       1.19.1-0                        kubernetes 
kubectl.x86_64                       1.19.10-0                       kubernetes 
kubectl.x86_64                       1.19.0-0                        kubernetes 
[root@k8s-master01 ~]#

条件情况说明

准备4台机器，是单master集群安装

192.168.186.128 k8s-master01
192.168.186.129 k8s-node01
192.168.186.130 k8s-node02
192.168.186.131 ansible

#永久修改主机名
hostnamectl set-hostname k8s-master01  && bash   #在master1上操作
hostnamectl set-hostname k8s-node01    && bash   #在node1上操作
hostnamectl set-hostname k8s-node02    && bash   #在node1上操作
hostnamectl set-hostname ansible       && bash   #在ansible上操作

1. ansible机器与部署k8s集群都做免密钥

cat >> /etc/hosts << EOF
192.168.186.128    k8s-master01
192.168.186.129    k8s-node01
192.168.186.130    k8s-node02
192.168.186.131    ansible   
EOF

#所有机器上都操作
ssh-keygen -t rsa #一路回车，不输入密码
###把本地的ssh公钥文件安装到远程主机对应的账户
for i in k8s-master01 k8s-node01 k8s-node02 ansible;do ssh-copy-id -i .ssh/id_rsa.pub $i ;done

2. ansible安装

#Ansible服务器安装
yum install epel-release git -y
yum install ansible -y

# 克隆部署k8s集群文件 
yum -y install git 
git clone https://gitee.com/qq759035366/ansible-kubeadm-install.git

#ansible机器上操作
cd ansible-kubeadm-install/
cat > hosts << EOF
[master]
# 如果部署单Master或多master的主master配置
192.168.186.128    node_name=k8s-master01[masternode]
# 用于存储集群部署多节点master，单独存放一个组，对部署编写方便
192.168.186.128    node_name=k8s-master01[node]
192.168.186.129    node_name=k8s-node01
192.168.186.130    node_name=k8s-node02[etcd]
192.168.186.128  etcd_name=etcd-1[lb]
# 如果部署单Master，该项忽略[k8s:children]
master
masternode
node[newnode]
192.168.0.187   ansible_ssh_port=22  node_name=k8s-node03EOF

#ansible机器上操作
cat > group_vars/all.yml << EOF
#  安装目录
etcd_work_dir: '/etc/etcd'  
tmp_dir: '/tmp/k8s'# k8s执行配置临时目录
tmp_kubernetes_dir: '/root/kubernetes'# 集群网络
service_cidr: '10.96.0.0/12'
pod_cidr: '10.244.0.0/16' # 与roles/addons/files/calico.yaml中网段一致# 集群版本
k8s_version: 1.20.0   # 版本测试安装了，v1.19.0-v1.20.0版本，按照需要版本修改# 高可用，如果部署单Master，该项忽略
nic: 'ens33'  # **注意这里一定要修改，修改为实际内网网卡名# 自签证书可信任IP列表，为方便扩展，可添加多个预留IP
cert_hosts:# 包含所有etcd节点IPetcd:- 192.168.186.128
EOF

ansible-kubeadm-install/group_vars/all.yml #网卡默认是eth0,一定要修改这个网卡

ansible-kubeadm-install/roles/SingleMaster/tasks/main.yml #网卡默认是eth0,如果你做了修改一定要修改这个下面的网卡替换方式参考博客

3. 高可用K8S集群v1.20.0安装

#K8S集群v1.20.0安装
cd /root/ansible-kubeadm-install
ansible-playbook -i hosts -uroot single-master-deploy.yml

注意：这里只需要等待就行，大概需要30多分钟就安装好了

4. 检查安装情况

kubectl get nodes
kubectl get pods -n kube-system

[root@k8s-master01 ~]# kubectl get nodes
NAME           STATUS   ROLES                  AGE     VERSION
k8s-master01   Ready    control-plane,master   35m     v1.20.0
k8s-node01     Ready    <none>                 3m40s   v1.20.0
k8s-node02     Ready    <none>                 34m     v1.20.0
[root@k8s-master01 ~]#

5. dashboard检查

kubectl get pods,svc  -n kubernetes-dashboard #查看dashboard对外端口

[root@k8s-master01 ~]# kubectl get pods,svc  -n kubernetes-dashboard #查看dashboard对外端口
NAME                                             READY   STATUS    RESTARTS   AGE
pod/dashboard-metrics-scraper-7b59f7d4df-z9m6m   1/1     Running   1          35m
pod/kubernetes-dashboard-5dbf55bd9d-m6vfr        1/1     Running   1          35mNAME                                TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)         AGE
service/dashboard-metrics-scraper   ClusterIP   10.108.128.243   <none>        8000/TCP        35m
service/kubernetes-dashboard        NodePort    10.104.187.42    <none>        443:30001/TCP   35m
[root@k8s-master01 ~]#

#获取用户Token
kubectl describe secrets -n kube-system $(kubectl -n kube-system get secret | awk '/dashboard-admin/{print $1}')#使用输出的token登录Dashboard
#访问地址：https://IP:30001/ #注意必须是https://

6. 测试kubernetes 集群

kubectl create deployment nginx --image=nginx
kubectl expose deployment nginx --port=80 --type=NodePort
kubectl get pod,svc

[root@k8s-master01 ~]# kubectl get pod,svc 
NAME                         READY   STATUS    RESTARTS   AGE
pod/nginx-6799fc88d8-qnf95   1/1     Running   1          3h12mNAME                 TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
service/kubernetes   ClusterIP   10.96.0.1       <none>        443/TCP        3h57m
service/nginx        NodePort    10.104.134.62   <none>        80:32216/TCP   3h12m
[root@k8s-master01 ~]#

浏览器访问 IP:32216

7. 节点扩容

修改hosts文件，添加新节点IP

# vi hosts
...
[newnode]
192.168.0.187   ansible_ssh_port=22  node_name=k8s-node03

#执行安装添加k8s集群node节点
ansible-playbook -i hosts -uroot add-node.yml # 如果安装某个阶段失败，可针对性测试.例如：只运行部署插件
# ansible-playbook -i hosts -uroot single-master-deploy.yml  --tags common