Working with Docker Container - Injecting a new process to a running container

 Injecting a new process to a running container

While doing development and debugging, we might want to look inside the already running container. There are a few utilities, such as nsenter (https://github.com/jpetazzo/nsenter), that allow us to enter into the namespace of the container to inspect it. With the exec option, we can inject a new process inside a running container.

Syntax:
    docker exec [-d|--detach[=false]] [--help] [-i|--interactive[=false]] [-t|--tty[=false]] CONTAINER COMMAND [ARG...]

Let's start an centos container and then inject uptime into that

root@Docker:~# id='docker run -d mysql'
root@Docker:~# docker run -it $id bash
root@b4e78b89bcf3#

For help with the docker run use --help