docker: Finding an alternative to the ps command using the /proc filesystem

2 min read

On some container we might find the nasty surprise that the ps command is no available:

$ ps
sh: 1: ps: not found

If we need to check the processes (and it's arguments) we'll need to resort to the /proc filesystem

16/12/2021

netstat and ss alternative to get the list of listening TCP ports

4 min read

On docker containers we might not have neither netstat nor ss installed, yet we can still get the list of listening TCP ports by looking at the /proc filesystem

07/07/2021

Testing a TCP connection using bash

2 min read

To be able to debug issues we can test a TCP connection using netcat (nc) or even telnet. But when we are on a containerized environment such as Kubernetes it can be a challenge when the container doesn't have the right tools for the job

$ nc
bash: nc: command not found
$ netcat
bash: netcat: command not found
$ telnet
bash: telnet: command not found

05/07/2021