How to install daemontools (supervise) on centos 5

centos5daemontoolsprocess

I'd like to use supervise to monitor httpd, mysqld and hudson processes on Centos 5. When any of these processes go down I'd like to use a tool to automatically restart them.

I've read and heard about supervise, but couldn't find a way to install it on centos.

Can anyone help me with that? Any other tools are also good, as long as they can be easily installed on centos 5 and allow me to automatically restart httpd, mysqld, hudson.

Thanks for your help!

Best Answer

Maybe it can be worth to try out runit

It is compatible with daemontools and has rpm packages available. The install instructions are http://smarden.org/runit/install.html (if you compile from source instead)

You can stick to daemontools if you want http://cr.yp.to/daemontools/install.html

Tell the error messages if you get stuck with the install process.

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Check the values of your mysql server. Are you using default users in mysql? I'd also take a look at two things:

Be sure that only specific servers can connect to the mysql database. If you have a user that is connecting from % be sure that you have a good password (and good reason).
Be sure that someone isn't sending queries to your application outside of the code requirements that you have in place to run the application. Someone may be injecting data into your database without even visiting your site.

Keep track of you active connections for a while by paying close attention to netstat. The wait_timeout is an indication that someone/something has queried your server. Keeping close track will help you discover who they are. Once you do that if you need to quickly block them without making drastic changes, use iptables.

One last thing... enable mysql logging briefly. Your server will take a hit but you'll see exactly what's going on with mysql.

edit the my.cnf file and add (or update) this:

log             = /var/log/mysql/mysql.log

EDIT: I made the preceding suggestions because the NULL value in the info field indicates that no statements are being executed.

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I think that the number of processes forked per sec is a bit too high on one of the servers

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You can do it by combination of ps and watch command (paging version):

watch 'ps -eo ppid,pid,comm --forest'

Best Answer

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