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Store server
RunningHost name, root password, reverse names of the addresses, and SSH keys.
The name the server calls itself; it shows in the terminal and in mail the server sends.
For SSH and the terminal. We check its strength and never store it; we only keep that it was set.
The name returned by a reverse lookup of an IP address; it helps mail sent from the server get delivered.
Keys allowed to sign in as root without a password. We keep only the fingerprint.