LXD/LXC

Fire up an Debian 10 in a LXC Container and name it "docker-registry
lxc launch images:debian/10 docker-registry

Adjust the behavior of the LXC Container, otherwise docker wont't be able to work

lxc config set docker-registry security.nesting true
lxc config set docker-registry security.privileged true

cat <

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on the foreman server I had to run:

puppet cert clean client-certname

on the client

rm -rf /var/lib/puppet/ssl

and

puppet agent -td --server=

Additional Hints

To fix this, remove the certificate from both the master and the agent and then start a puppet run, which will automatically regenerate a certificat...

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