July 2015
Beginner
150 pages
3h 16m
English
Content preview from Nginx Essentials
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Control signals and their usage
Nginx, like any other Unix background service, is controlled by signals. Signals are asynchronous events that interrupt normal execution of a process and activate certain functions. The following table lists all signals that Nginx supports and the functions that they trigger:
|
Signal |
Function |
|---|---|
|
|
Fast shutdown |
|
|
Graceful shutdown |
|
|
Reconfiguration |
|
|
Log file reopening |
|
|
Nginx binary upgrade |
|
|
Graceful worker shutdown |
All signals must be sent to the master process of an instance. The master process of an instance can be located by looking it up in the process list:
# ps -C nginx -f UID PID PPID C STIME TTY TIME CMD root 4754 3201 0 11:10 ? 00:00:00 nginx: master process ...
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