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45 lines
1.6 KiB
Markdown
45 lines
1.6 KiB
Markdown
# SSH
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`ssh` is a program for logging into a remote machine and for executing commands on a remote machine. It is intended to provide secure encrypted communications between two untrusted hosts over an insecure network.
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## Basics
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```sh
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ssh user@destination <command> # exec <command> in remote machine ($SHELL if omitted)
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ssh user@destination -i <path/to/private-key> # use key for auth
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ssh user@destination -f # exec ssh in the background
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ssh user@destination -N # do not send commands to the server (do not start $SHELL)
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ssh user@destination -g # allow remote hosts to connect to local forwarded ports
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ssh user@destination -t # force pseudo-tty emulation
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```
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> **Note**: use `~` while connected to use the "ssh console".
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### Jump-Hosts
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Connect to the final destination jumping through the specifies other destinations.
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```sh
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ssh -J user_1@destination_1,user_2@destination_2 user@final_destination
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```
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## Port Forwarding
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### Local Port Forwarding
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Start listening on `local_address:local_port` and forward any traffic to `remote_address:remote_port`.
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```sh
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ssh -N -f -L local_address:local_port:remote_address:remote_port user@destination
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ssh -N -f -L local_port:remote_address:remote_port user@destination # local_address defaults to localhost
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```
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### Remote Port Forwarding
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Start listening on `remote_address:remote_port` and forward any traffic to `local_address:local_port`.
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```sh
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ssh -N -f -R remote_address:remote_port:local_address:local_port user@destination
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```
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