[Docker] Accessing a Container

If you want to get into container and look around, you can use:

Docker container exec

To run against a running container. And to does that, we need to know the id/name of the running container.

To get id/name of the container, we can do:

Ls

For example, the name of the container is called:elegant_noether.

du -mh

and ' DU-MH ' would print out the size of each folder:

$ docker Container exec Elegant_noetherdu-mh16k./error/include220k./error44k./Build8.0K./htdocs892k./include72k./conf/extra72k./conf/original/extra96k./conf/original268k./conf260k./icons/Small1.3M./icons20k./cgi-bin4.5M./Modules8.0K./logs1.2M./bin8.4M.

Running commands is cool, but we can also attach a shell to those containers and browse them just like they were a full op Erating System.

-i -t  exec The and flags can is passed to the command to keep a interactive shell open, and you can specify the She ll you want to attach after the container ID. Here we'll attach a standard Bash shell.

Docket Container exec-it Elegant_noether/bin/bash

We ' re in! From the perspective of the terminal window we ' re just navigating a normal Unix system, so any commands we type would run I Nside of that system. Try typing that same command we just ran with from exec inside the container.

Now to check the size of each folder, we can just do:

du -mh

$ docker Container exec-it elegant_noether/bin/Bash[email protected]:/usr/local/apache2#du-mh16k./error/include220k./error44k./Build8.0K./htdocs892k./include72k./conf/extra72k./conf/original/extra96k./conf/original268k./conf260k./icons/Small1.3M./icons20k./cgi-bin4.5M./Modules8.0K./logs1.2M./bin8.4M.

Another thing we can do once we ' re in a container's shell is install new programs, or packages, which aren ' t part of the BA SE image. Let's install the package fortunes .

Install -y fortunes

The package is installed in

/usr/games/fortune

It ' s kind /usr/games/ fortune of annoying to has to type before the command, so let's update the PATH environment variable in th e container So, we don ' t has to type all of the that anymore.

Path= $PATH:/usr/games/

Now we can export path:

Export PATH

After then we can just type ' fortune ' to start the game

[Docker] Accessing a Container