April 2018
Intermediate to advanced
374 pages
8h 35m
English
Content preview from Kubernetes for Developers
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Handling a graceful shutdown
With the lifecycle hooks, we mentioned the pre-stop hook that can be defined and enabled, but if you're writing your own code, then you may find it just as easy to respect the SIGTERM signal that Kubernetes uses to tell containers to shut down.
If you aren't familiar with SIGTERM, it is one of the functions that Linux supports from the kernel—a means of sending an interrupt to a running process. The process can listen for these signals, and you can choose how they respond when they are received. There are two signals that you can't ignore and the operating system will enforce, regardless of what you implement: SIGKILL and SIGSTOP. The signal that Kubernetes uses when it wants to shut down a container is SIGTERM. ...
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