How Do I Get into a Docker Container’s Shell?

If you want to explore containers file system it simply wan to get an access to containers shell, you can use one of the following options

Using the docker exec command

Docker version 1.3 or newer supports the docker exec command. This command can run the new process in an already running container. This means you can run bash /bin/bash in the container state like this:

docker exec -t -i container_name /bin/bash

Using Snapshotting

You can peek into the docker file system by following these steps:

1. Find the id of your running container

docker ps

1. Create an image (snapshot) from the container file system

docker commit 12345678904b5 mysnapshot

1. Explore the file system using the bash

docker run -t -i mysnapshot /bin/bash

This way, you can evaluate the filesystem of the running container at the precise time moment. The container is still running, no future changes are included.

To delete the snapshot, run the following command:

docker rmi mysnapshot

Using the ssh

If you want continuous access to the docker file system, you can install the sshd to your container and run the sshd daemon:

docker run -d -p 22 mysnapshot /usr/sbin/sshd -D

To see to which port to connect, run the following command:

docker ps

Solved: Errors in crontab file, can't install

You may encounter this error while creating a new crontab or updating an existing one that has a syntax error.

Questions

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How Do I Pass Environment Variables to Docker Containers?

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Solved: Cron missing newline before EOF

This error may also happen when a crontab file is generated automatically and the generator failed to insert a newline character at the end of the crontab file.

Questions

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