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Firewalld Cheat Sheet
Notes and Tips To list all services firewalld is aware in an easy to read format use command firewall-cmd –get-services | tr ” ” “\n” Default firewalld service .xml files can be found under /usr/lib/firewalld/services For all commands that support the –zone= option if no zone is provided it will use the default zone. To make changes persistent add […]
Create Permanent alias on CentOS/Redhat
The ‘alias’ command in CentOS allows for you to create an alias to a command. For example, if you want to use the vim text editor, but are used to typing vi file-to-edit.txt, you can create an alias to automatically start vim instead of vi when typing the command. Showing current aliases To show the […]
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 […]