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| − | ==Docker basics==
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| − | We have already learned how to download Docker images using the «docker pull» command and how to create a container using the «docker run» command. We will now learn about other basic Docker commands. We can use the «docker ps» command to see all the containers in our machine:
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| − | sudo docker ps -a
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| − | We should be able to see the Postgres container running.
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| − | [[File:Output_of_the_dockerpa-a_command.png|1000px|thumb|center|Output of the docker pa -a command]]
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| − | Each container and image has an associated ID that looks like the following:
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| − | c6f7dfc1a4c8
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| − | We can use the following command to stop a running Docker container:
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| − | sudo docker stop INSERT_CONTAINER_ID_HERE
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| − | sudo docker stop c6f7dfc1a4c8
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| − | Similarly, we can run a Docker container using the start command:
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| − | sudo docker start c6f7dfc1a4c8
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| − | Please note that the run command is used to create a new Docker container while the start command is used to run an existingDocker container given its ID.
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| − | We can use the following command to remove a Docker container:
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| − | sudo docker rm c6f7dfc1a4c8
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| − | Please note that before you can remove a Docker container, you must stop it. The following command can be used to remove aDocker image:
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| − | sudo docker rmi INSERT_IMAGE_ID_HERE
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| − | Please note that before you can remove a Docker image, you must stop and remove all its associated containers.
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| − | <br />
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