Systemd

The systemd application polls systemd and scrapes systemd units' load, activation, and sub states.

SNMP Extend

Copy the python script, systemd.py, to the desired host

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

Make the script executable
```
chmod +x /etc/snmp/systemd.py
```
Edit your snmpd.conf file and add:
```
extend systemd /etc/snmp/systemd.py
```
(Optional) Create a /etc/snmp/systemd.json file and specify:
1. "systemctl_cmd" - String path to the systemctl binary [Default: "/usr/bin/systemctl"]
2. "include_inactive_units" - True/False string to include inactive units in results [Default: "False"]
```
{
    "systemctl_cmd": "/bin/systemctl",
    "include_inactive_units": "True"
}
```
(Optional) If you have SELinux in Enforcing mode, you must add a module so the script can access systemd state:

cat << EOF > snmpd_systemctl.te
module snmpd_systemctl 1.0;

require {
        type snmpd_t;
        type systemd_systemctl_exec_t;
        type init_t;
        class file { execute execute_no_trans map open read };
        class unix_stream_socket connectto;
        class system status;
}

#============= snmpd_t ==============
allow snmpd_t init_t:system status;
allow snmpd_t init_t:unix_stream_socket connectto;
allow snmpd_t systemd_systemctl_exec_t:file { execute execute_no_trans map open read };
EOF
checkmodule -M -m -o snmpd_systemctl.mod snmpd_systemctl.te
semodule_package -o snmpd_systemctl.pp -m snmpd_systemctl.mod
semodule -i snmpd_systemctl.pp

Restart snmpd.
```
sudo systemctl restart snmpd
```