1, Help command

docker --help

2, Process related commands

1. Start Docker service

   systemctl start docker
   

2. Stop docker service

   systemctl stop docker
   

3. Restart docker service

   systemctl restart docker
   

4. View docker service status

   systemctl status docker
   

5. Start the docker service

   systemctl enable docker
   

3, Mirror related commands

1. View mirror

   # View all information about the mirror
   docker images
   
   # View the id of the image used
   docker images –q
   

2. Search image

   # Search image
   docker search Image name
   
   # For example, search for redis images
   docker search redis
   

3. Pull image

   # Pull the latest image
   docker pull Image name
   
   # Pull the image of the specified version
   docker pull Image name:Version number
   

   If you don't know the image version, you can go docker hub Search to view the version.

4. delete mirror

   # Deletes the specified local mirror
   docker rmi image id
   
   # Delete all local images (generally do not need to change the command)
   docker rmi `docker images -q`
   

4, Container related commands

1. View container

   # View running containers
   docker ps
   
   # View all containers
   docker ps -a
   

2. Create container

   # Create container
   docker run parameter
   
   # For example, after creating a centos container, it automatically enters the container. When exiting the container, the container automatically closes
   docker run -it --name=c2 centos:8
   
   # For example, create a centos container in background guard mode
   docker run -id --name=c3 centos:8
   

   Parameter Description:

   • -i: Keep the container running. Usually used with - t.
   • -t: Reassign a pseudo input terminal to the container, usually in conjunction with - i.
   • -d: Run the container in daemon (background) mode.
   • -The container created by it is generally called interactive container. After the container is created, it automatically enters the container. After exiting the container, the container automatically closes.
   • -The container created by id is generally called a guard container.
   • – Name: name the created container.

3. Enter container

   # Exit the container and the container will not close
   docker exec parameter
   
   # For example, enter a container named c3
   docker exec -it c3 /bin/bash
   

4. Start container

   # Start container
   docker start Container name
   
   # For example, start a container named c3
   docker start c3
   

5. Stop container

   # Stop container
   docker stop Container name
   
   # For example, stop a container named c3
   docker stop c3
   

6. Delete container

   # Delete container
   docker rm Container name
   
   # For example, delete a container named c3
   docker rm c3
   

   Note: you need to stop the container to delete it.

7. View container information

   # View container information
   docker inspect Container name
   
   # For example, view the information of a container named c3
   docker inspect c3
   

8. Copy container files to host

   docker cp container id Or container name:The file path to be copied by the container is copied to the file path belonging to the master
   

5, Container's data volume

1. Data volume

   • Data volume
     • A data volume is a directory or file in the host
     • When the container directory and the data volume directory are bound, the other party's modifications will be synchronized immediately
     • A data volume can be mounted by multiple containers at the same time
     • A container can also mount multiple data volumes
   • Data volume function:
     • Container data persistence
     • Indirect communication between external machine and container
     • Data exchange between containers

# When creating a boot container, use the – v parameter to set the data volume
docker run ... –v Host Directory(file):In container directory(file) [–v Host Directory(file):In container directory(file)...]

# For example, create centos8 c1 container and / root / Tata of the container_ Mount the container to / root/data of the system
docker run -it --name=c1 -v /root/data:/root/tata_container centos:8 /bin/bash

[note]:

• The directory of the container must be an absolute path.
• If the directory does not exist, it is created automatically.
• Multiple data volumes can be mounted.
• The following / bin/bash can be ignored.

1. Data volume container

   • Concept: a directory or file of the host
   • effect:
     • Container data persistence
     • Client and container data exchange
     • Data exchange between containers
   • Data volume container:
     • Create a container, mount a directory, and let other containers inherit from the container (– volume from).
     • Data volume configuration in a simple way

# Create a boot c3 data volume container and set the data volume using the – v parameter
docker run –it --name=c3 –v /volume centos:8 /bin/bash 

# Create the boot c1 c2 container and set the data volume with the – - volumes from parameter
docker run –it --name=c1 --volumes-from c3 centos:8 /bin/bash
docker run –it --name=c2 --volumes-from c3 centos:8 /bin/bash