SpamapS.org – Full Frontal Nerdity

Clint Byrum's Personal Stuff

‘service foo restart’ on Ubuntu 12.04 will “Do the right thing”

Just a quick note.. I was watching Artur Bergman’s rant about Full Stack awareness at Velocity Europe with glee, until I saw how we, the Ubuntu devs, had drawn his ire for breaking something so simple, ‘restart’.

I’ve heard this before, and I realized that its true! Restart should ignore that the service is stopped, and just start it, otherwise just restart it as I requested.

So, first off, instead of:

/etc/init.d/apache2 restart

or (for upstart controlled services)

restart mysql

get in the habit of doing:

service apache2 restart

This command will do the right thing more often than not (including clearing out the environment for sysvinit jobs, which can help solve the “why does the service only work when I restart it manually”). And as of 12.04, it will start doing the right thing with restart too.

Its not perfect, and there are still bugs in upstart, but the version of ‘sysvinit’ that I just uploaded to Precise Pangolin (the future 12.04 / LTS release of Ubuntu) at least gives scripters and sysadmins a chance at uniformity by making upstart jobs and sysvinit scripts do the same thing with restart. I don’t think we can backport this all the way to 10.04, so sorry for that. However, please, users, keep the rants coming.. we need them!

November 16, 2011 at 1:38 am Comments (0)

Time for some ghetto monitoring

If you came here between April 28 and about an hour ago, you got a “couldn’t connect to database” error. Oops! Seems my limited memory EC2 instance got a little overwhelmed by php processes and decided the db server, drizzled, should die to make more room for PHP. Ooops! Time to drop pm.max_children.

I don’t have any monitoring setup for the site, so I just now figured it out. Until I get proper monitoring, I’ve installed this fancy bit of duct-tape upstart magic:

start on stopping
task
script
env | mail -s "$JOB is stopping!" me@myemail.com
end script

What does this do? Well is emails me whenever upstart gives up respawning something, or I manually stop a service.

Its not monitoring. I need monitoring. But this is a nice little hack to prevent a regression while I figure that out.

May 2, 2011 at 4:54 pm Comments (0)