Useful logging commands to troubleshoot

This is a page that's very important in figuring out any issues we have with configuration

systemd logs

• journalctl -xe
• journalctl -f ( the -f means the logs update in real time)
• journalctl -k (any kernel related errors)
• journalctl -p err (looking for any current errors)

Puppet logs

The puppet server, in this case it's our Management server

• sudo tail -f /var/log/puppetlabs/puppetserver/puppetserver.log
• sudo tail -f /var/log/puppetlabs/puppetserver/puppetserver-status.log
• sudo tail -f /var/log/puppetlabs/puppetserver/puppetserver-access.log

Nagios logs

• sudo tail -n 50 /var/log/apache2/error.log
• sudo less /var/log/nagios3/nagios.log

sudo less /var/log/puppetlabs/puppetserver/puppetserver.log | grep "ERROR"

Not so much a log but more so checking for any syntax/config errors for the nagios-related config files:

nagios3 -v <nagios-config-file>

Example: nagios3 -v /etc/nagios3/nagios.cfg

sudo journalctl -u nagios3 -n 50

Link: https://www.puppet.com/docs/pe/2019.8/log-locations-reference.html