kubernetes常用命令

#1.查询信息kubectl get [需要查询的服务]  

node 节点
componentstatuses 简写 cs ??组件状态
namespaces ???????简写 ns ??名命空间
pod ?????????????pod信息 添加 （-o wide ）查看运行节点
service ?????????查询service

deployments --all-namespaces ??kind分类查询

all --all-namespaces 查询所有 

--all-namespaces ?所有命名空间

###将信息输入为yaml格式

kubectl get pod  [pod名] -o yaml

nginx-6f858d4d45-sgwdf 1/1 Running 0 3h
[root@k8s-m ~]# kubectl ?get pod ?nginx-6f858d4d45-sgwdf -o yaml
apiVersion: v1
kind: Pod
metadata:
?creationTimestamp: 2018-09-01T10:01:55Z
?generateName: nginx-6f858d4d45-

...省略

#2.删除
1.删除节点

kubectl delete node node1

2.删除pod

kubectl delete pod $(pod_name) -n $(namespace-name)

3.删除services

kubectl delete svc $(svc_name) -n $(namespace-name)

#3.创建
1.创建pod

kubectl create -f ?create_pod.yaml 
2.更新pod

kubectl rolling-update pod_v1 -f pod_v2.yaml

3.回滚

kubectl rolling-update pod_v2 --rollback

问题定位

1.查询对象详细信息

kubectl describe pod [pod名] -n ?[所在命名空间]

[root@k8s-m ~]# kubectl describe pod client -n default
Name: ??????????????client
Namespace: ?????????default
Priority: ??????????0
PriorityClassName: ?<none>
Node: ??????????????node1/10.0.0.40
Start Time: ????????Sat, 01 Sep 2018 20:12:08 +0800
Labels: ????????????run=client
Annotations: ???????<none>
Status: ????????????Failed
IP: ????????????????10.244.1.5

..........

2.查询日志

kubectl logs -f [pod名] -n ?[所在命名空间]

[root@k8s-m ~]# kubectl logs -f client -n default
/ #
/ # ls
bin ??etc ??proc ?sys ??usr
dev ??home ?root ?tmp ??var
/ # cat /etc/resolv.conf
nameserver 10.96.0.10
search default.svc.cluster.local svc.cluster.local cluster.local
options ndots:5
/ # ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue 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
3: eth0@if9: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1450 qdisc noqueue
???link/ether 0a:58:0a:f4:01:05 brd ff:ff:ff:ff:ff:ff
???inet 10.244.1.5/24 scope global eth0
??????valid_lft forever preferred_lft forever

.........省略

3.进入容器运行命令，如果pod有多个容器，可用-c指定容器

kubectl exec   [pod名称]   -c  [docker镜像]    [执行的命令]    -n [命名空间]

[root@k8s-m ~]# kubectl exec nginx-6f858d4d45-sgwdf -c nginx hostname -n default
nginx-6f858d4d45-sgwdf