I'm running a docker container with CentOS 7 + PostgreSQL 9.4. Using this docker image.
So, after pulling the image, I've created the container, following the instructions, and exposing the PostgreSQL port 5432.
Of course, I can execute a shell in my container, by doing this
docker exec -it CONTAINER_NAME /bin/bash
After that, I'm logged as postgres user. But I need to install more software (basically, postgres related stuff, or some command line tools).
EDIT: What I'd need, for example, is to install the lsof tool (not available by default in CentOS 7, can be installed with yum install lsof).
So, I'd need a different user, able to install software. Unless...
I'm not doing things the right way, and what I really need is another container to monitorize PostgreSQL. Or even use my host machine (Mac OS X) for that. But then... How could I use commands like lsof, or htop? I need to be in the same container that runs PostgreSQL for that.
Am I right?