Download Image
docker pull ubuntu
Create a CONTAINER
Example:
docker run --name helloword -it -v /home/Host path:/home/container route ubuntu bash
- Parameter -- name sets the name of the CONTAINER. If it is empty, it will be generated randomly
- Parameter - v sets the absolute path of the shared directory between the host and the container: container absolute path
- Here ubuntu corresponds to the image name
- bash is the command you want to execute
CONTAINER list query
docker ps -a
The results are as follows:
docker ps -a [8:07:29] CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 7b04183a5d84 ubuntu "bash" 7 hours ago Up 7 hours helloword 7738a2fd18f1 ubuntu "bash" 7 hours ago Exited (0) 7 hours ago quirky_mccarthy
Enter CONTAINER
docker attach $NAMES
docker attach $CONTAINER ID
Example:
Enter via NAME
docker attach helloword
Enter via CONTAINER ID
docker attach 7b04183a5d84
Exit CONTAINER
- The shortcut key ctrl -p ctrl-q exits and causes the CONTAINER to run in the background
- If the command exit exits, the CONTAINER will be shut down directly
Delete CONTAINER (be careful)
docker attach $NAMES
docker attach $CONTAINER ID
CONTAINER shutdown
docker stop $CONTAINER ID
CONTAINER boot
docker start $CONTAINER ID
Query space occupancy
View overall space occupancy
docker system df
Query space occupancy details
docker system df --verbose
View CONTAINER space usage
docker ps --size
Query image list
docker images
Delete image
Format: docker rmi $CONTAINER ID
docker rmi a404d6ba5c24
CONTAINER backup and restore (snapshot)
In fact, in some scenarios, I use docker as an efficient virtual machine. In the process of using virtual machines, I often use the snapshot function of virtual machines. Does docker have a function similar to snapshot? We only consider local backup and restore here, and do not upload to the docker registry.
reference resources:
https://www.linuxidc.com/Linux/2015-08/121184.htm
backups
# Check the CONTAINER ID. what we found here is b660e10ca5d9
docker ps
# Create Snapshot
# Format: docker commit -p ${CONTAINER ID} ${name of backup}
docker commit -p b660e10ca5d9 ubuntu-v0.1
Wait a moment, the execution result is as follows:
# docker commit -p b660e10ca5d9 ubuntu-v0.1 sha256:a404d6ba5c2468135e56012b6c02320f2f1125d97bf5508fa15717d6daa631d3
query snapshot
docker images
In the execution result, you can view the snapshot we just made and turn it into a mirror image.
| REPOSITORY | TAG | IMAGE ID | CREATED | SIZE |
|---|---|---|---|---|
| ubuntu-v0.1 | latest | a404d6ba5c24 | About a minute ago | 1.06GB |
| ubuntu | latest | ba6acccedd29 | 6 weeks ago | 72.8MB |
There is a mirror, how to use needless to say. Just use it like the image downloaded from the Internet.
For example:
docker run --name demo -it -v /home/demo:/home/ ubuntu-v0.1 zsh
Note the following ubuntu-v0.1
Snapshot sharing
Unexpectedly, our image is ready. Can we share it? Can it be transplanted to other machines?
docker save -o ~/ubuntu-v0.1.tar ubuntu-v0.1
Wait a moment, there are no logs in the process. After running, we found that the image file has been generated in the ~ / directory.
reduction
Since the backup file is generated above, it is meaningful to restore the previous backup of the image.
docker load -i ~/ubuntu-v0.1.tar
When finished, execute:
docker images
It is found that our image has been successfully loaded.