Linux: Difference between revisions
No edit summary |
|||
Line 63: | Line 63: | ||
</pre> | </pre> | ||
<code>prime-select query</code> will print either <code>nvidia</code> or <code>intel</code> to stdout. | <code>prime-select query</code> will print either <code>nvidia</code> or <code>intel</code> to stdout. | ||
==Environment Variables== | |||
[https://help.ubuntu.com/community/EnvironmentVariables Ubuntu Help Reference] |
Revision as of 18:56, 16 October 2019
A collection of notes on using Linux systems, in particular Ubuntu.
SSH
SSH Keys
Generate an ssh-key for every client
ssh-keygen -t ed25519 -a 100 [-C "comment your client name"] [-f output_path]
Some older software such as Solid file explorer require RSA keys in PEM key format
ssh-keygen -t rsa -b 4096 -a 100 -m PEM [-C "comment your client name"] [-f output_path]
You can also convert existing keys to PEM format
ssh-keygen -p -m PEM [-C "comment your client name"] [-f output_path]
Manage ssh keys
# On the client
ssh-copy-id [email protected]
# On the server
vim ~/.ssh/authorized_keys
Notes:
- According to this you should avoid using ECDSA and DSA keys.
Port Forwarding
Also: SSH Tunneling, SSH Proxy, SSH Reverse Proxy
If you need to access a port on the remote computer, you can use the -L
option to forward ports from the remote to the local machine.
ssh -L <localport>:localhost:<remoteport> <remoteurl>
# E.g. ssh -L 8080:localhost:80 [email protected]
You can also do the reverse, giving the remote access to a local port using -R
ssh -R <localport>:host:<remoteport> <remoteurl>
# E.g. ssh -R 8080:localhost:80 [email protected]
VNC
x11vnc
Reference I recommend not exposing VNC. Set it to localhost only and use ssh port forwarding.
Remmina
How to use Remmina to connect to over ssh tunnel
Nvidia
Switching between Nvidia and Intel
Reference
Make sure the Nvidia graphics drivers are installed. Then you can select between Nvidia and Intel GPUs using the Nvidia X Server Settings application nvidia-settings
. Alternatively, you can use the following commands in the terminal.
To switch to the Nvidia GPU:
sudo prime-select nvidia
To switch back to the Intel GPU:
sudo prime-select intel
prime-select query
will print either nvidia
or intel
to stdout.