Portainer supports running in an air-gapped environment.
Make sure you're using the portainer/portainer-ee image.
Add --add-host "api.portainer.io:0.0.0.0" to the Docker command.
Or this when using compose:
extra_hosts:
- "api.portainer.io:0.0.0.0"You can also block it at your firewall/DNS server, but this is enough.
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Mirror: https://vaclive.party/software/portainer