k8s中操作pause容器

在k8s中如何操作pause容器，具体步骤如下：

一、创建测试pod，如下：

apiVersion: v1
kind: Pod
metadata:
  name: multi-container-pod
spec:
  containers:
  - name: container-writing-dates
    image: alpine
    command: ["/bin/sh"]
    args: ["-c", "while true; do date >> /var/log/output.txt; sleep 10;done"]
  - name: container-serving-dates
    image: nginx:latest
    ports:
      - containerPort: 80
        
        
启动pod
[root@caas-1 ~]# kubectl apply -f mul-pod.yaml
pod/multi-container-pod configured

二、查看pod所在节点

[root@caas-1 ~]# kubectl get pod  -o wide
NAME                  READY   STATUS    RESTARTS   AGE    IP             NODE     NOMINATED NODE   READINESS GATES
multi-container-pod   2/2     Running   0          100s   172.26.28.54   caas-3              


###以上可知pod在caas-3节点上

三、进入pod所在节点，查看对应pause容器ID、pid

[root@caas-3 ~]# docker ps |grep multi       容器ID为f1aa8674bdb9
0ad55e74fb72        fa5269854a5e                                                      "/docker-entrypoint.…"   22 minutes ago      Up 22 minutes                                k8s_container-serving-dates_multi-container-pod_default_48c899af-791a-458e-bc4c-8ad797c6201e_0
e10a75b4ba10        alpine                                                            "/bin/sh -c 'while t…"   23 minutes ago      Up 23 minutes                                k8s_container-writing-dates_multi-container-pod_default_48c899af-791a-458e-bc4c-8ad797c6201e_0
f1aa8674bdb9        172.16.168.229:5000/pause:3.2                                     "/pause"                 24 minutes ago      Up 24 minutes                                k8s_POD_multi-container-pod_default_48c899af-791a-458e-bc4c-8ad797c6201e_0

 查看容器pid
[root@caas-3 ~]# docker inspect f1aa8674bdb9| grep -i Pid
            "Pid": 8603,
            "PidMode": "",
            "PidsLimit": null,

四、进入pause命名空间

[root@caas-3 ~]# nsenter -t 8603 -n bash 
[root@caas-3 ~]# 
[root@caas-3 ~]# 
[root@caas-3 ~]# ip a
1: lo:  mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
2: tunl0@NONE:  mtu 1480 qdisc noop state DOWN group default qlen 1000
    link/ipip 0.0.0.0 brd 0.0.0.0
4: eth0@if132:  mtu 1440 qdisc noqueue state UP group default 
    link/ether 6e:64:76:3e:62:86 brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet 172.26.28.54/32 scope global eth0
       valid_lft forever preferred_lft forever

之后便可进行各种操作，管理其他容器