I've got monit up and running on an Ubuntu 12.04 server, to monitor nginx, but I can't get it to successfully start nginx up again. My setup is thus: the monit config file is:
-rwx------ 1 root root 10329 2015-07-31 09:39 /etc/monit/monitrc
and the content (non commented) of the monitrc file is
set daemon 60
set logfile /var/www/apps/myapp/log/monit.log
set httpd port 2812
use address mysite.com
allow username:password 'password'
check system mysite.com
if loadavg (1min) > 4 then alert
if loadavg (5min) > 2 then alert
if memory usage > 75% then alert
if cpu usage (user) > 70% then alert
if cpu usage (system) > 30% then alert
if cpu usage (wait) > 20% then alert
check process nginx with pidfile /opt/nginx/logs/nginx.pid
start program = "/etc/init.d/nginx restart; touch /var/www/apps/myapp/tmp/restart.txt"
stop program = "/etc/init.d/nginx stop"
I'm starting monit with sudo monit
.
If I kill nginx and then wait for monit to try to start it, I see this in the log file:
[UTC Jul 31 09:39:26] info : Reinitializing monit daemon
[UTC Jul 31 09:39:26] info : Starting monit HTTP server at [mysite.com:2812]
[UTC Jul 31 09:39:26] info : monit HTTP server started
[UTC Jul 31 09:39:26] info : 'myhost.mydomain.tld' Monit reloaded
[UTC Jul 31 09:40:26] error : 'nginx' process is not running
[UTC Jul 31 09:40:26] info : 'nginx' trying to restart
[UTC Jul 31 09:40:26] info : 'nginx' start: /etc/init.d/nginx
[UTC Jul 31 09:40:56] error : 'nginx' failed to start
When I run the nginx restart command myself in the terminal then it works fine:
sudo /etc/init.d/nginx restart; touch /var/www/apps/myapp/tmp/restart.txt
this restarts it fine (the touch
command is to reload a ruby app which is running under Passenger - touching the restart file triggers the restart of the app.)
Taking the touch
command out of the line in the monit config doesn't make any difference. When I try to restart nginx via monit's web interface, that also fails.
I think that if I could somehow get the STDERR and STDOUT streams into the log file as well, when monit tries to start nginx, that would help at least.
Any suggestions?
/opt/nginx/logs/nginx.pid
to know whether or not the process to be watched (nginx
) is alive and running. By running/etc/init.d/nginx restart
doesnginx
certainly createnginx.pid
with its PID in the content?-r-------- 1 root root 5 2015-07-31 10:18 /opt/nginx/logs/nginx.pid