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I have used this at some point in past:

echo $RANDOM | sha512sum | head -c 128; echo

Then insert it in the config.yaml You can change 128 to 64 if you don't fancy the long token...

Yes, that was it. Thanks!

I often use the

apg

tool (stands for Automatic Password Generator) as I think it's in Debian/Ubuntu & RHEL repos and it gives you the fine grained control you may want for choosing.