Posted By: Anonymous
I’m getting started working with Docker. I’m using the WordPress base image and docker-compose.
I’m trying to ssh into one of the containers to inspect the files/directories that were created during the initial build. I tried to run
docker-compose run containername ls -la, but that didn’t do anything. Even if it did, I’d rather have a console where I can traverse the directory structure, rather than run a single command. What is the right way to do this with Docker?
docker attach will let you connect to your Docker container, but this isn’t really the same thing as
ssh. If your container is running a webserver, for example,
docker attach will probably connect you to the stdout of the web server process. It won’t necessarily give you a shell.
docker exec command is probably what you are looking for; this will let you run arbitrary commands inside an existing container. For example:
docker exec -it <mycontainer> bash
Of course, whatever command you are running must exist in the container filesystem.
In the above command
<mycontainer> is the name or ID of the target container. It doesn’t matter whether or not you’re using
docker compose; just run
docker ps and use either the ID (a hexadecimal string displayed in the first column) or the name (displayed in the final column). E.g., given:
$ docker ps d2d4a89aaee9 larsks/mini-httpd "mini_httpd -d /cont 7 days ago Up 7 days web
I can run:
$ docker exec -it web ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 18: eth0: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP link/ether 02:42:ac:11:00:03 brd ff:ff:ff:ff:ff:ff inet 172.17.0.3/16 scope global eth0 valid_lft forever preferred_lft forever inet6 fe80::42:acff:fe11:3/64 scope link valid_lft forever preferred_lft forever
I could accomplish the same thing by running:
$ docker exec -it d2d4a89aaee9 ip addr
Similarly, I could start a shell in the container;
$ docker exec -it web sh / # echo This is inside the container. This is inside the container. / # exit $