Fail2ban

A small shell script that checks your system's fail2ban status.

SNMP Extend

Copy the shell script, fail2ban, to the desired host.

wget https://github.com/librenms/librenms-agent/raw/master/snmp/fail2ban -O /etc/snmp/fail2ban

Make the script executable
```
chmod +x /etc/snmp/fail2ban
```
Edit your snmpd.conf file (usually /etc/snmp/snmpd.conf) and add:
```
extend fail2ban /etc/snmp/fail2ban
```
1. If you want to use the cache, it is as below, by using the -c switch.
```
extend fail2ban /etc/snmp/fail2ban -c
```
2. If you want to use the cache and update it if needed, this can by using the -c and -U switches.
```
extend fail2ban /etc/snmp/fail2ban -c -U
```
3. If you need to specify a custom location for the fail2ban-client, that can be done via the -f switch.
```
extend fail2ban /etc/snmp/fail2ban -f /foo/bin/fail2ban-client
```
  If not specified, /usr/bin/env fail2ban-client is used.
Restart snmpd on your host
```
sudo systemctl restart snmpd
```
2. If you wish to use caching, add the following to /etc/crontab and restart cron.

The following will update the cache every 3 minutes.
```
*/3    *    *    *    *    root    /etc/snmp/fail2ban -u
```

If you have more than a few jails configured, you may need to use caching as each jail needs to be polled and fail2ban-client can't do so in a timely manner for than a few. This can result in failure of other SNMP information being polled.

For additional details of the switches, please see the POD in the script it self at the top.