Use of Kubectl basic commands

Basic concepts of kubernetes

• Pod: k8s minimum deployment unit, a collection of containers

• Deployment: the most common controller for higher-level deployment and management of pods

• Service: provides load balancing for a group of pods and provides unified access to the outside world

• Label: label, attached to a resource, used to associate objects, query and filter

• Namespaces: namespace. The logical isolation of objects is also conducive to permission control

Basic Commands (Beginner):

create Create a resource from a file or from stdin.

expose use replication controller, service, deployment perhaps pod And expose it as a new Kubernetes Service

run Run a specified mirror in the cluster

set by objects Sets a specified feature

Basic Commands (Intermediate):

explain View documents for resources

get Show one or more resources

edit Edit a resource on the server

delete Delete resources by filenames, stdin, resources and names, or by resources and label selector

Deploy Commands:

rollout Manage the rollout of a resource

scale by Deployment, ReplicaSet, Replication Controller perhaps Job Set a new number of copies

autoscale Automatically adjust one Deployment, ReplicaSet, perhaps ReplicationController Number of copies

Cluster Management Commands:

certificate modify certificate resources.

cluster-info Display cluster information

top Display Resource (CPU/Memory/Storage) usage.

cordon sign node by unschedulable

uncordon sign node by schedulable

drain Drain node in preparation for maintenance

taint Update one or more node Upper taints

Troubleshooting and Debugging Commands:

describe Displays a specified resource perhaps group of resources details

logs Output container in pod Logs in

attach Attach To a running container

exec In a container Execute a command in

port-forward Forward one or more local ports to a pod

proxy Run a proxy reach Kubernetes API server

cp copy files and directories reach containers And copy from container files and directories.

auth Inspect authorization

Advanced Commands:

diff Diff live version against would-be applied version

apply By file name or standard input stream(stdin)Configure resources

patch use strategic merge patch Update the of a resource field(s)

replace adopt filename perhaps stdin Replace a resource

wait Experimental: Wait for a specific condition on one or many resources.

convert In different API versions Conversion profile

Settings Commands:

label Update on this resource labels

annotate Update the annotation of a resource

completion Output shell completion code for the specified shell (bash or zsh)

Other Commands:

alpha Commands for features in alpha

api-resources Print the supported API resources on the server

api-versions Print the supported API versions on the server, in the form of "group/version"

config modify kubeconfig file

plugin Provides utilities for interacting with plugins.

version output client and server Version information for

//Run an nginx of pod type, named nginx, and the inner type is deployment

[root@master ~]# kubectl create deployment nginx --image nginx

deployment.apps/nginx created

[root@master ~]# kubectl get pod

NAME READY STATUS RESTARTS AGE

nginx-6799fc88d8-7wp8w 1/1 Running 0 24s

[root@master ~]# kubectl get deployment

NAME READY UP-TO-DATE AVAILABLE AGE

nginx 1/1 1 1 28s

Delete pod

$ k delete pod nginx1