What is PID 1 in container?
Running Docker containers spawns processes with the PID of 1. This means that SIGTERM , the signal used for graceful shutdown, will be ignored by your process. To avoid this problem, you can use the exec from within your wrapper shell script along with a custom signal handler.
What happens if you kill PID 1?
You can restart the init process. This is useful for making changes to inittab without having to reboot. sudo kill -INT 1 (interrupt) will restart system, and sudo kill -SEGV 1 , ( segmentation violation) or sudo kill -ABRT 1 (abort) will generate a kernel panic. note: sudo is required.
Is there a problem with PID 1 in Docker?
When building Docker containers, you should be aware of the PID 1 zombie reaping problem. That problem can cause unexpected and obscure-looking issues when you least expect it. This article explains the PID 1 problem, explains how you can solve it, and presents a pre-built solution that you can use: Baseimage-docker.
How to kill process inside container using Docker?
When you do docker exec the command is executed inside the container => should use container’s pid. Otherwise you could do the kill without docker straight from the host, in your case: sudo kill -9 25055. to understand this start from executing commands from left till end of each pipe (|)
How to explicitly kill the process with PID 1 from?
To kill PID 1 you will have to explicitly declare the handler for the SIGTERM signal or, in current versions of Docker, pass the –init flag in the docker run command to instrument tini. You can ‘kill 1’ somewhere to exit this whole container.
Why is Docker not able to stop the container properly?
The problem is that docker is not able to stop the container properly with docker stop recursor. After some time the OOMKiller terminates the programm with the following information: I searched the web and the signals 128 + 9 = 137 mean that I don’t have sufficient RAM, what is simply not the case.