netplan System Events

During system initialization, systemd launches a series of system-generators very early in the startup phase. These generators help with low-level setup on items.

In the netplan case, the netplan generate command is called. netplan generate builds the network configuration from the netplan yaml files in the /etc/netplan/ directory and installs the configuration in the temporary configuration location.

This location on a NetworkManager-based stack is /run/NetworkManager/system-connections/name.nmconnection.

When NetworkManager starts, it processes all the configurations in the /run... directory.

For example, we can find the password for a network adapter within /etc/netplan/50-cloud-init.yaml:

cat /etc/netplan/50-cloud-init.yaml | grep password -B1
             access-points:
                 MY_AP:
                     password: PASSWORD