In Jack Wallen’s The best way to Make Tech Work tutorial, he exhibits how utilizing the Docker exec command gives you with extra flexibility.
Do you know you possibly can situation instructions inside a operating Docker container? It’s a really useful method to do issues like replace software program, restart providers and far more. Even higher, Docker makes this gorgeous simple, because of the exec command.
There are two methods you need to use exec. The primary is to realize entry to a operating container’s shell, the place you possibly can then run any command as if you happen to’re on the Linux terminal. To do that, you may first find the operating container’s ID, which will be performed with the command
docker psWith that ID in hand, you possibly can entry the container with a command like
docker exec -it ID /bin/bashthe place ID is the primary 4 characters of the container ID in query.
As soon as on the bash immediate, you possibly can situation the instructions you require, corresponding to
apt-get replace && apt-get improve
When you’re performed, you possibly can exit the container with this command
exitHowever what if you wish to skip step one and execute the identical instructions from exterior the container? That is additionally potential utilizing the exec command.
Let’s say you wish to run the identical instructions for updating and upgrading the software program in your container. You’ll nonetheless want the container ID and might run a command like
docker exec ID apt-get replace && sudo apt-get improve -ythe place ID is the primary 4 characters of the container ID in query.
You’re not restricted to only updating and upgrading your containers; any command that may be run from the bash immediate will be run from exterior the container.
Take pleasure in this new flexibility that comes with the Docker exec command.
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