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linux/ssh: improved ssh key login with link to automation video

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wiki/linux/ssh.md
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@ -41,6 +41,9 @@ You can use the modified command below for ease of use:
cat ~/.ssh/id_rsa.pub | ssh username@server 'cat >> ~/.ssh/authorized_keys' cat ~/.ssh/id_rsa.pub | ssh username@server 'cat >> ~/.ssh/authorized_keys'
``` ```
This can also be more or less fully automated using the `-G` flag of SSH as described in
[a YouTube video by nixhero](https://www.youtube.com/watch?v=xCX14u9XzE8).
### Mount Directory With SSHFS ### Mount Directory With SSHFS
This section is loosely based on This section is loosely based on
@ -71,7 +74,7 @@ Host server
User user User user
``` ```
### X-Forwarding ### X-Forwarding
The following sections address the usage of X-forwarding which makes it possible to use graphical The following sections address the usage of X-forwarding which makes it possible to use graphical
programs remotely over SSH. programs remotely over SSH.
@ -80,7 +83,7 @@ programs remotely over SSH.
This section is based on a This section is based on a
[blog by rc nectar](https://tutorials.rc.nectar.org.au/x11forwarding/02-enable-x11-on-virtual-machine). [blog by rc nectar](https://tutorials.rc.nectar.org.au/x11forwarding/02-enable-x11-on-virtual-machine).
For the server setup of X-forwarding edit the file `/etc/ssh/sshd_config` and make sure For the server setup of X-forwarding edit the file `/etc/ssh/sshd_config` and make sure
X-forwarding is enabled by editing a line to look like the following. X-forwarding is enabled by editing a line to look like the following.
```txt ```txt
@ -112,7 +115,7 @@ following lines.
``` ```
ForwardX11 yes ForwardX11 yes
ForwardX11Trusted yes ForwardX11Trusted yes
``` ```
The functionality of X-forwarding can easily be tested by running a graphical program when remotely The functionality of X-forwarding can easily be tested by running a graphical program when remotely
connected. connected.
@ -120,13 +123,13 @@ An example for this could be the simple clock program `xclock`.
### Port Tunneling ### Port Tunneling
This section is based on the This section is based on the
[documentation of PostgreSQL](https://www.postgresql.org/docs/current/ssh-tunnels.html). [documentation of PostgreSQL](https://www.postgresql.org/docs/current/ssh-tunnels.html).
A specific port can be tunneled from a remote host to a client via SSH. A specific port can be tunneled from a remote host to a client via SSH.
This could be especially useful when coding remotely and wanting to access a database like This could be especially useful when coding remotely and wanting to access a database like
PostgreSQL or other services. PostgreSQL or other services.
For the forwarding of a port run the following command. For the forwarding of a port run the following command.
`<local address>` (for example `localhost`) and `<local port>` (for example `63333`) are the `<local address>` (for example `localhost`) and `<local port>` (for example `63333`) are the
target (and most of the time local) address and port to tunnel the service to. target (and most of the time local) address and port to tunnel the service to.
`<address of server>` (for example `joe@foo.com` or an alias) specifies the address and username of `<address of server>` (for example `joe@foo.com` or an alias) specifies the address and username of
@ -141,14 +144,14 @@ After running the command the tunnel will stay established until the process is
This can be done by running a command identical or similar to the following which is used to find This can be done by running a command identical or similar to the following which is used to find
the process. the process.
```sh ```sh
ps aux | grep "ssh -f -N -L <local port>" ps aux | grep "ssh -f -N -L <local port>"
``` ```
Afterwards it can be killed by running the follwing command where `<process-id>` is the id of the Afterwards it can be killed by running the follwing command where `<process-id>` is the id of the
process found with the previous command. process found with the previous command.
```sh ```sh
kill <process-id> kill <process-id>
``` ```