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Improve error handling around setting ulimits

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The log messages about open file limits have always
been slightly opaque and confusing.  Here's an attempt to
fix their wording, detail, and meaning.  Users will have a
better understanding of how to fix very common problems
with these reworded messages.

Also, we handle a new error case when maxclients becomes less
than one, essentially rendering the server unusable.  We
now exit on startup instead of leaving the user with a server
unable to handle any connections.

This fixes antirez#356 as well.
This commit is contained in:
Matt Stancliff 2014-03-22 19:23:01 -04:00
parent 491532a713
commit 4a25983f8f
1 changed files with 22 additions and 4 deletions
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26
src/redis.c
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@ -1522,12 +1522,30 @@ void adjustOpenFilesLimit(void) {
}
if (f < oldlimit) f = oldlimit;
if (f != maxfiles) {
int old_maxclients = server.maxclients;
server.maxclients = f-REDIS_EVENTLOOP_FDSET_INCR;
redisLog(REDIS_WARNING,"Unable to set the max number of files limit to %d (%s), setting the max clients configuration to %d.",
(int) maxfiles, strerror(errno), (int) server.maxclients);
if (server.maxclients < 1) {
redisLog(REDIS_WARNING,"Your current 'ulimit -n' "
"of %llu is not enough for Redis to start. "
"Please increase your open file limit to at least "
"%llu. Exiting.", oldlimit, maxfiles);
exit(1);
}
redisLog(REDIS_WARNING,"You requested maxclients of %d "
"requiring at least %llu max file descriptors.",
old_maxclients, maxfiles);
redisLog(REDIS_WARNING,"Redis can't set maximum open files "
"to %llu because of OS error: %s.",
maxfiles, strerror(errno));
redisLog(REDIS_WARNING,"Current maximum open files is %llu. "
"maxclients has been reduced to %d to compensate for "
"low ulimit. "
"If you need higher maxclients increase 'ulimit -n'.",
oldlimit, server.maxclients);
} else {
redisLog(REDIS_NOTICE,"Max number of open files set to %d",
(int) maxfiles);
redisLog(REDIS_NOTICE,"Increased maximum number of open files "
"to %llu (it was originally set to %llu).",
maxfiles, oldlimit);
}
}
}