VNC and X Window Connections

To launch an X application, make an ssh tunnel and then launch the X app an it'll appear locally.

• ssh -X -J admin@usno-serv-1t-ext server-1p
• emacs &

To create a VNC connection:

1. ssh -L 5901:localhost:5901 -J admin@usno-serv-1t-ext admin@server-1
2. Set a password using vncpasswd
3. Start it by doing vncserver. Note the display number (probably one). The ssh tunnel is set up to work with display :1. For display :2 you would need to use 5902 instead of 5901 when creating the tunnel.
4. In a separate local terminal do vncviewer localhost:5901 (for display :1) and enter the vncpassword you selected above when a popup window appears.
5. When done, on the terminal with the tunnel do vncserver -kill :displayNumber (e.g., 1 or 2).
6. Exit from the ssh session if desired.

Viewing the Nagios dashboard on the local browser.

1. To view the nagios dashboard you have to create a tunnel to reach the https port (443). You can do that with a separate tunnel or by adding additional -L clauses to the ssh.
   • Example: ssh -L 10443:localhost:443 -J admin@usno-serv-1t-ext admin@server-1
   • Example: ssh -L 5901:localhost:5901 -L 10443:localhost:443 -J admin@usno-serv-1t-ext admin@server-1
2. On a local browser open https://localhost:10443/nagios. This will ask for the nagios admin user ("admin") and password.