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Important Linux Commands

### Check Inode usage for i in /*; do echo $i; find $i |wc -l; done ### How do you empty a linux directory with a large size/number of files? -bash: /bin/rm: Argument list too long find . -name “*” | xargs -n 10 rm

Update oVirt hosted-engine host certificates VM if the are expired

Environment: Red Hat Virtualization 4.4 Issue:  All the hosted-engine hosts vdsm certificates are expired. The hosted-engine VM is down and it’s unable to start it using hosted-engine –vm-start because of expired certificates. Resolution: Since CA of the RHV environment is the RHV manager which is down, we have to get the CA certificates and keys to the host […]

Sending SNMP Traps from Nagios

As well as receiving SNMP traps in Nagios, you can send SNMP traps from Nagios to a remote SNMP management station like HP OpenView (NNM) or the like. The easiest way to do this is to create a notification command that generates an SNMP trap. This way, you can use an SNMP management station as […]