Custom DNS for OpenFaaS Edge

By default, OpenFaaS Edge will use Google's public DNS servers to look up IP addresses from core-services and from functions. This is done to ensure that the functions can reach the Internet.

If you deploy OpenFaaS Edge within a private VPC, or enterprise network, you may need to configure custom DNS servers for functions for them to reach the Internet.

During installation

You can specify custom DNS servers during the installation phase with:

faasd install --dns-server 1.1.1.1 --dns-server 8.8.4.4

Update an existing installation

Sometimes, it's easier to update the system after the installation.

Update the systemd services for faasd and faasd-provider to include the --dns-server flag.

Edit the following:

• /var/lib/faasd/faasd.service
• /var/lib/faasd-provider/faasd-provider.service

In each, find the ExecStart line and add the --dns-server flag once per DNS server.