Probably most of the programs does handle SIGTERM appropriately, but it
may be too little time for a program to clean itself before it receives
SIGKILL signal. For an example mysql. It needs to kill any connections to
it (and if any problem killing it, it should wait for some time and then
try again), sync data, remove socket (I don't know the exact order of
mysql shutdown task and I'm only guessing). And what if SIGKILL arrives
in the middle of the mysql shutdown tasks?
Hannah Schroeter wrote:
Hi!
On Wed, Sep 19, 2007 at 02:48:54PM +0300, Tomas wrote:
Watching the thread about startup script I thought of a question about
shutdown script. Is it necessary to shutdown certain services when
machine goes down? Like for example mysql, dovecot, clamav, amavis or
openvpn. I've never saw anybody do that. Lots of people on their
manuals, tutorials or posts writes how to start mysql, but none of then
writes a shutdown script. So maybe it is not so necessary? (But then
again, mysql is a database engine, and databases should be handle with
care).
Probably most programs that need non-trivial cleanup handle SIGTERM
appropriately.
Kind regards,
Hannah.
