Source: https: //macrozheng.github.io/mall-learning/#/reference/docker

Developers must-Docker command

This article explains the installation and use of the environment Docker Docker commonly used commands, a great help to master these applications have to be deployed under Docker environment.

Docker Profile

Docker is an open source application container engine that lets developers can package their applications and dependencies into a portable mirror, and then publish to any of the popular Linux or Windows machine. Docker can be more convenient to use low packaging, testing, and deploying applications.

Docker installation environment

Install yum-utils:

yum install -y yum-utils device-mapper-persistent-data lvm2

Add docker warehouse location yum source:

yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

Installation docker:
```
yum install docker-ce
```
Start docker:
```
systemctl start docker
```

Docker mirror commonly used commands

Search Mirror

docker search java

Show pictures

Download image

docker pull java:8

How to find the version supported by the mirror

Since docker search command can only find out whether there is the mirror, the mirror can not find a supported version, so we need to search for the version supported by docker hub.

Docker hub into the official website address: https: //hub.docker.com
Then search image needs:
View mirror supported versions:
Mirroring the download operation:
```
docker pull nginx:1.17.0
```

Listed Mirror

docker images

Show pictures

Remove Mirror

Specify the name to remove the mirror
```
docker rmi java:8
```
Specify the name remove the mirror (mandatory)
```
docker rmi -f java:8
```
Forced to delete all mirrors
```
docker rmi -f $(docker images)
```

Docker containers commonly used commands

New and launch container

docker run -p 80:80 --name nginx -d nginx:1.17.0

-d option: that run in the background
--name option: After you specify the name of the vessel is running nginx, after the vessel can be operated by name
-p option: Specifies the port mapping format: hostPort: containerPort

Listed container

Listed container running:
```
docker ps
```

List all containers

docker ps -a

Stop the container

# $ContainerName及$ContainerId可以用docker ps命令查询出来
docker stop $ContainerName(或者$ContainerId)

such as:

docker stop nginx
#或者
docker stop c5f5d5125587

Forced to stop container

docker kill $ContainerName(或者$ContainerId)

Start a stopped container

docker start $ContainerName(或者$ContainerId)

Into the container

First check out the pid container:

docker inspect --format "{{.State.Pid}}" $ContainerName(或者$ContainerId)

The containers enter the container pid:

nsenter --target "$pid" --mount --uts --ipc --net --pid

Delete container

Removes the specified container:

docker rm $ContainerName(或者$ContainerId)

Forced to remove all containers;
```
docker rm -f $(docker ps -a -q)
```
View log container

All your current log

docker logs $ContainerName(或者$ContainerId)

Dynamic View Log

docker logs $ContainerName(或者$ContainerId) -f

Check the IP address of the container

docker inspect --format '{{ .NetworkSettings.IPAddress }}' $ContainerName(或者$ContainerId)

Time synchronization host to the vessel

docker cp /etc/localtime $ContainerName(或者$ContainerId):/etc/

View docker use in the host cpu, memory, network, io situation

Check the specified container situation:

docker stats $ContainerName(或者$ContainerId)

View all containers case:
```
docker stats -a
```
Docker bash into the interior of the container
```
docker exec -it $ContainerName /bin/bash
```

Modifying the image storage location Docker

View Docker mirrored storage location:
```
docker info | grep "Docker Root Dir"
```
Close Docker Service:
```
systemctl stop docker
```
Moved to the target directory path:
```
mv /var/lib/docker /mydata/docker
```
Soft establish the connection:
```
ln -s /mydata/docker /var/lib/docker
```

Docker necessary command