UniFi Additions and Modifications

Revised:Dec 17 09:59:24 EST 2024
Original:Feb 4 06:51:14 EST 2024

A few things added to and modified on UniFi systems. This page will expand with details over time.

DHCP lease renewal on switch

• renew the lease on a UniFi switch without rebooting the switch
• killall -HUP udhcpc # this restarts the /sbin/udhcpc process

on_boot system

• on_boot system that provides persistent modifications and additions with every boot despite UniFi updates that erase so many things. This system is based on a github project but greatly simplified.
• Add legitimate LetsEncrypt certificates via on_boot to controller and manually to cameras to make local access more pleasant.
• Install ssh keys via on_boot for convenient login
• tailor dnsmasq via on_boot for local name servers and reserved addresses etc

Ookla Speedtest on Gateway

• Refer to ookla page
• Use script on referenced page
• armhf for raspberry 32 bit
• aarch64 for unifi, unvr, cloudkey, etc and raspberry pi 64 bit

SNMP Install and Configure

• Add snmpd to gateway for MRTG to access. Avoid turning SNMP on for the whole network, just the gateway.
• works on UniFi UGX and UDM, probably any gateway
• Reference
• must run apt-get update prior to install
• apt-get install snmp snmpd libsnmp-dev
• configuration must be in two locations
• /usr/share/snmp/snmpd.conf
/etc/snmp/snmpd.conf
• Need systemd unit file to start snmpd (comes with snmpd install)
• /lib/systemd/system/snmpd.service
• Some unifi updates remove the snmpd binary. If this happens must stop and start the snmpd.service after reinstalling snmpd. This could be incorporated into on_boot
• Install commands

  apt-get update
  apt-get -y install snmp snmpd libsnmp-dev
  cp snmpd.conf-src /usr/share/snmp/snmpd.conf
  cp snmpd.conf-src /etc/snmp/snmpd.conf
          

References