环境：kubernet1.17

1、容器按照持续运行的时间可分为两类：服务类容器server和工作类容器job。服务类容器通常持续提供服务，需要一直运行，比如 http server，daemon 等。工作类容器则是一次性任务，比如批处理程序，完成后容器就退出。

[root@master1 ~]# kubectl get service
NAME             TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)          AGE
kubernetes       ClusterIP   10.96.0.1       <none>        443/TCP          64d
mysql            ClusterIP   10.108.4.142    <none>        3306/TCP         60d
nacos-headless   NodePort    10.107.129.42   <none>        8848:32000/TCP   60d
[root@master1 ~]# kubectl get pod
NAME                                      READY   STATUS    RESTARTS   AGE
mysql-2h86g                               1/1     Running   2          60d
nacos-0                                   1/1     Running   1          60d
nacos-1                                   1/1     Running   1          60d
nacos-2                                   1/1     Running   1          60d
nfs-client-provisioner-6f6478c949-s4pjs   1/1     Running   2          63d
redis-tribe                               1/1     Running   0          18h
[root@master1 ~]# kubectl get job --all-namespaces
NAMESPACE                    NAME                                                             COMPLETIONS   DURATION   AGE
istio-system                 istio-init-crd-10-1.3.3                                          1/1           10s        63d
istio-system                 istio-init-crd-11-1.3.3                                          1/1           9s         63d
istio-system                 istio-init-crd-12-1.3.3                                          1/1           9s         63d

2、对于 Kubernetes 里个各种 Controller 来说：
Deployment、ReplicaSet 和 DaemonSet 都用于管理服务类容器。

[root@master1 ~]# kubectl get deployments.apps -n istio-system
NAME                     READY   UP-TO-DATE   AVAILABLE   AGE
istio-citadel            1/1     1            1           63d
istio-galley             1/1     1            1           63d
[root@master1 ~]# kubectl get DaemonSet --all-namespaces
NAMESPACE                      NAME            DESIRED   CURRENT   READY   UP-TO-DATE   AVAILABLE   NODE SELECTOR                 AGE
kube-system                    calico-node     15        15        15      15           15          beta.kubernetes.io/os=linux   64d
kube-system                    kube-proxy      15        15        15      15           15          beta.kubernetes.io/os=linux   64d
[root@master1 ~]# kubectl get ReplicaSet  --all-namespaces
NAMESPACE                      NAME                                             DESIRED   CURRENT   READY   AGE
chinapopin-prod                datasource-aytzgf-56db5fbc94                     0         0         0       13d
chinapopin-prod                datasource-aytzgf-57f6bb858c                     0         0         0       35d
chinapopin-prod                datasource-aytzgf-5f766997dc                     0         0         0       24d

3、Job、CronJon 则用于管理工作类容器。

[root@master1 ~]# kubectl get cronjobs.batch --all-namespaces
NAMESPACE                   NAME                                                  SCHEDULE    SUSPEND   ACTIVE   LAST SCHEDULE   AGE
kubesphere-logging-system   elasticsearch-logging-curator-elasticsearch-curator   0 1 * * *   False     0        15h             63d
[root@master1 ~]# kubectl get jobs.batch --all-namespaces
NAMESPACE                    NAME                                                             COMPLETIONS   DURATION   AGE
istio-system                 istio-init-crd-10-1.3.3                                          1/1           10s        63d
istio-system                 istio-init-crd-11-1.3.3                                          1/1           9s         63d
istio-system                 istio-init-crd-12-1.3.3                                          1/1           9s         63d