O.K. I have checked all the options from my old tutorial Installing a puppet smart proxy against a katello main server and noticed that --puppet-server-ca
is true by default. So now I get a successful foreman-installer run with:
[root@foreman9-content ~]# foreman-installer --enable-puppet \
--foreman-proxy-puppet true \
--puppet-server true \
--foreman-proxy-puppetca false \
--puppet-ca-server foreman8.example.com \
--puppet-server-ca false