Glossary term
What is PID 1 (PID 1 (the first process))?
PID 1 stands for PID 1 (the first process).
The first process in a container, which does not get the default kill-on-SIGTERM action, so apps must handle the signal.
Learn it properly · Docker & KubernetesLesson 0: Why Containers: Images, Containers and How They Differ From VMsThe problem containers solve, namespaces and cgroups in plain words, images versus containers, registries, and the first docker run.