SSH

PublicKeyAuthentication

keygen

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ssh-keygen -t ed25519 -C "comment"

authorized_keys

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cat ~/.ssh/id_ed25519.pub >> ~/.ssh/authorized_keys

ssh config

/etc/ssh/sshd_config

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Port 22
PermitRootLogin no
#PermitRootLogin prohibit-password
PubkeyAuthentication yes
PasswordAuthentication no
#AllowUsers user1 user2

GatewayPorts

Allow remote port forwarding to bind 0.0.0.0.

ssh config

/etc/ssh/sshd_config

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GatewayPorts yes