Commit 7587a410 authored by Jeremy Hylton's avatar Jeremy Hylton

Add log file rotation section to howto.

Remove signals file, since the only signal you actually need to use is
for log-file rotation.
parent b45056ab
Signals (POSIX only)
Signals are a POSIX inter-process communications mechanism.
If you are using Windows then this documentation does not apply.
The ZEO storage server process (started with ZEO/start.py) responds to
signals which are sent to the process id written to the file
'ZOPE_HOME/var/ZEO_SERVER.pid'::
SIGTERM - Close open storages and sockets, then shut down.
kill -TERM `cat ZOPE_HOME/var/ZEO_SERVER.pid`
SIGHUP - Close open storages and sockets, then restart.
kill -HUP `cat ZOPE_HOME/var/ZEO_SERVER.pid`
SIGUSR2 - Rotate log files.
kill -USR2 `cat ZOPE_HOME/var/ZEO_SERVER.pid`
When using zdaemon (the default), the pid file contains the pid of
the zdaemon process. Otherwise (when the -s option is used), the
pid file contains the storage server's own pid.
Note that zdaemon forwards signals to the child process.
Specifically, it forwards all those signals listed above, plus
SIGINT, SIGQUIT and SIGUSR1.
......@@ -374,6 +374,16 @@ XXX example of how to use zdrun
XXX mkzeoinst.py docs should probably go here
Rotating log files
~~~~~~~~~~~~~~~~~~
ZEO will re-initialize its logging subsystem when it receives a
SIGUSR2 signal. If you are using the standard event logger, you
should first rename the log file and then send the signal to the
server. The server will continue writing to the renamed log file
until it receives the signal. After it receives the signal, the
server will create a new file with the old name and write to it.
Diagnosing problems
-------------------
......
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