Introduction to Docker - Day 4
On day 4, we will learn how to manage and clean up containers. Then we will learn how to create common folder to be use in docker container.
Docker Container Management
Listed below are many command that can be used to manage containers. For some function, there are more than one command/method to perform the task.
To list down all container that are active using the command:
docker container ls
To list down all container including non-active containers, use the command
docker container ls -a
To stop an active container
docker container stop <container_name> docker container kill <container_name> docker stop <container_name> docker kill <container_name>
To remove container
docker container rm <container_name> docker rm <container_name>
To remove all inactive container
docker rm $(docker ps -aq) docker container prune
Sharing Folder with Containers
We can create a common folder to be used as data dump. After we exit the container, the data folder will still be around. Please follow the following example to create data folder
Use the following command to create a common folder
cd /Users/Shared mkdir dockerfolder cd dockerfolder
To run Ubuntu with the data folder, use the command
docker run -it --name myubuntu1 -v $(PWD):/home ubuntu
The option -v allow us to mount a volume. In this example, we use $PWD which is the current directory (dockerfile) and map the folder to /home folder in Ubuntu.
Write some text as shown below
cd /home echo "This is a test" >> test.txt
On the Mac OS, navigate to the Shared Folder (/Users/Shared/dockerfile) and check if the file test.txt exist.
Using $PWD is not a very good way as we might be moving in and out of the folder. Use the following command to run and mount the volume:
docker run -it -v /Users/Shared/dockerfolder:/home ubuntu
We can map any folder in the host system with any existing folder in Ubuntu.
The syntax of folder mapping is as follows:
docker run -it -v <local_folder>:<container_folder> <image_name>