What are the necessary Docker commands for developers?
Editor to share with you what Docker commands developers must have. I hope you will gain something after reading this article. Let's discuss it together.
Introduction to Docker
Docker is an open source application container engine that allows developers to package their applications and dependencies into a portable image and publish them to any popular Linux or Windows machine. Using Docker makes it easier to package, test, and deploy applications at a low level.
Docker environment installation
1. Install yum-utils:
Yum install-y yum-utils device-mapper-persistent-data lvm2
two。 Add the docker warehouse location for the yum source:
Yum-config-manager-- add-repo https://download.docker.com/linux/centos/docker-ce.repo
3. Install docker:
Yum install docker-ce
4. Start docker:
Common commands for systemctl start dockerDocker images search for image docker search java
Download image docker pull java:8 how to find the supported version of the image
Since the docker search command can only find out whether the image exists, but cannot find the supported version of the image, we need to search for the supported version through docker hub.
Go to docker hub's official website at https://hub.docker.com
Then search for the desired image:
View the versions supported by the image:
Download the image:
Docker pull nginx:1.17.0 lists mirrored docker images
Delete Mirror
Specify a name to delete the mirror
Docker rmi java:8
Specify name to delete mirror (mandatory)
Docker rmi-f java:8
Force deletion of all mirrors
Docker rmi-f $(docker images) Docker Container Common commands New and start Container docker run-p 80:80-- name nginx-d nginx:1.17.0
-d option: indicates running in the background
-- name option: specify the name of the container after running as nginx, and then you can manipulate the container by name.
-p option: specify port mapping, format: hostPort:containerPort
List containers
List the containers that are running:
Docker ps
List all containers
Docker ps-a
Stop containers # $ContainerName and $ContainerId can be queried docker stop $ContainerName (or $ContainerId) with the docker ps command
For example:
Docker stop nginx # or docker stop c5f5d5125587 force stop container docker kill $ContainerName (or $ContainerId) start the stopped container docker start $ContainerName (or $ContainerId) to enter the container
First query the pid of the container:
Docker inspect-- format "{{.State.Pid}" $ContainerName (or $ContainerId)
Enter the container according to its pid:
Nsenter-target "$pid"-mount-uts-ipc-net-pid
Delete Container
Delete the specified container:
Docker rm $ContainerName (or $ContainerId)
Force deletion of all containers
Docker rm-f $(docker ps-a-Q) View the container log docker logs $ContainerName (or $ContainerId)
Check the IP address of the container, docker logs $ContainerName (or $ContainerId)
Synchronize the host time to the container docker cp / etc/localtime $ContainerName (or $ContainerId): / etc/ check the use of cpu, memory, network and io of docker in the host.
View the specified container:
Docker stats $ContainerName (or $ContainerId)
View all containers:
Docker stats-a
Enter the bashdocker exec-it $ContainerName / bin/bash inside the Docker container
Modify the location of the Docker image
View the location where the Docker image is stored:
Docker info | grep "Docker Root Dir"
Shut down the Docker service:
Systemctl stop docker
Move the directory to the destination path:
Mv / var/lib/docker / mydata/docker
Establish a soft connection:
Ln-s / mydata/docker / var/lib/docker
After reading this article, I believe you have a certain understanding of "what are the necessary Docker commands for developers". If you want to know more about it, you are welcome to follow the industry information channel. Thank you for reading!
