Kubernetes Common Commands

#1. Query information kubectl get [services to be queried]

Node nodes
Componentstatuses abbreviated CS   Component Status
Namespaces        abbreviated NS   name space
Pod              pod info Add (-o wide) view run node
Service          Query Service

deployments --all-namespaces   Kind Classification Query

all --all-namespaces 

--all-namespaces  所有命名空间

###将信息输入为yaml格式

Kubectl get pod [pod name]-O YAML

NGINX-6F858D4D45-SGWDF 1/1 Running 0 3h
[[email protected] ~]# kubectl get pod nginx-6f858d4d45-sgwdf-o yaml
Apiversion:v1
Kind:pod
Metadata
creationtimestamp:2018-09-01t10:01:55z
generatename:nginx-6f858d4d45-

... Omitted

#2.删除
1.删除节点

kubectl delete node node1

2. Delete Pod

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

3. Delete Services

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

Problem Locator

1. Querying Object Details

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

[[email protected] ~]# kubectl describe pod client-n default
Name:client
Namespace:default
priority:0
Priorityclassname: <none>
node:node1/10.0.0.40
Start Time:sat, Sep 2018 20:12:08 +0800
Labels:run=client
Annotations: <none>
Status:failed
ip:10.244.1.5

..........

2. Query log

kubectl logs -f [pod名] -n  [所在命名空间]

[Email protected] ~]# 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: [Email protected]: <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

......... Omitted

3. Enter container Run command, if Pod has more than one container, use-C to specify container

KUBECTL exec [pod name]-C [Docker image] [command executed]-n [namespace]

[[email protected] ~]# kubectl exec nginx-6f858d4d45-sgwdf-c nginx hostname-n default
Nginx-6f858d4d45-sgwdf

Kubernetes Common Commands