It is recommended to disable any automatic package upgrades of the OS, as this may cause problems with Heartbeat or other compiled software like Asterisk and Kamailio. Package/OS upgrades should be done manually under the supervision of an engineer to avoid outages.

Ubuntu:

To check if automatic updates are enabled run:

• systemctl status unattended-upgrades

If they are, then edit /etc/apt/apt.conf.d/20auto-upgrades and set:

APT::Periodic::Unattended-Upgrade

to 0. Then run:

• systemctl stop unattended-upgrades
• systemctl disable --now unattended-upgrades

Red Hat-based Systems:

To check if automatic updates are enabled, open the file /etc/dnf/automatic.conf. If the value:

apply_updates

is set to yes, then automtic updates are enabled. In that case, set this to no and run:

• systemctl stop dnf-automatic.timer
• systemctl disable dnf-automatic.timer