KUBERNETES03_命名空间、Pod是什么、Deployment多副本能力、扩缩容、自愈或故障转移、滚动更新、版本回退（二）

# 在node2节点可以看到运行的mynginx和nginx镜像
[root@k8snode2 ~]# docker ps |grep mynginx
8596f8e18360   nginx                                                        "/docker-entrypoint.…"   3 minutes ago    Up 3 minutes              k8s_mynginx_mynginx_default_e3a3add5-2a0a-4af4-bcdb-719e8c1ff231_0
774584bc088f   registry.cn-hangzhou.aliyuncs.com/lfy_k8s_images/pause:3.2   "/pause"                 4 minutes ago    Up 4 minutes              k8s_POD_mynginx_default_e3a3add5-2a0a-4af4-bcdb-719e8c1ff231_0
[root@k8snode2 ~]# docker images
REPOSITORY                                                                 TAG        IMAGE ID       CREATED         SIZE
nginx                                                                      latest     ea335eea17ab   11 days ago     141MB

# 查看Pod的运行日志
kubectl logs Pod名字
# 每个Pod - k8s都会分配一个ip
kubectl get pod -owide
# 使用Pod的ip+pod里面运行容器的端口
curl 192.168.169.136
[root@k8smaster ~]# kubectl get pods -owide
NAME      READY   STATUS    RESTARTS   AGE   IP               NODE       NOMINATED NODE   READINESS GATES
mynginx   1/1     Running   0          21m   11.168.185.196   k8snode2   <none>           <none>
[root@k8smaster ~]# curl 11.168.185.196 
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
[root@k8smaster ~]# kubectl logs -f mynginx
2021/11/28 12:54:19 [notice] 1#1: start worker process 38
2021/11/28 12:54:19 [notice] 1#1: start worker process 39
11.168.16.128 - - [28/Nov/2021:13:14:56 +0000] "GET / HTTP/1.1" 200 615 "-" "curl/7.29.0" "-"

# 如何进入到mynginx容器
[root@k8smaster ~]# kubectl get pods 
NAME      READY   STATUS    RESTARTS   AGE
mynginx   1/1     Running   0          15m
[root@k8smaster ~]# kubectl exec -it mynginx -- /bin/bash
root@mynginx:/# cd /usr/share/nginx/html/
root@mynginx:/usr/share/nginx/html# ls
50x.html  index.html
root@mynginx:/usr/share/nginx/html# echo "hello tang"->index.html
root@mynginx:/usr/share/nginx/html# 

[root@k8smaster ~]# kubectl get pod mynginx -owide
NAME      READY   STATUS    RESTARTS   AGE   IP               NODE       NOMINATED NODE   READINESS GATES
mynginx   1/1     Running   0          16m   11.168.185.197   k8snode2   <none>           <none>
[root@k8smaster ~]# curl 11.168.185.197
hello tang-

apiVersion: v1
kind: Pod
metadata:
  labels:
    run: mynginx
  name: mynginx
#  namespace: default
spec:
  containers:
  - image: nginx
    name: mynginx