VNC over SSH
Revision as of 17:04, 18 August 2022 by Digimer (talk | contribs) (→If connection via a gateway ssh machine)
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Alteeve Wiki :: How To :: VNC over SSH |
This tutorial covers setting up VNC over SSH on EL8.3+ (RHEL 8, CentOS Stream 8, etc). and EL9.
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Note: Make sure all admin users are logged out (Gnome and terminal). There is a bug we don't know the source of yet that can break the ability to log into gnome. |
VNC Server Setup
SSH into the Striker dashboard as the root user.
dnf install tigervnc-server
Last metadata expiration check: 0:19:19 ago on Wed 17 Aug 2022 12:06:35 PM EDT.
Dependencies resolved.
==============================================================================================================
Package Architecture Version Repository Size
==============================================================================================================
Installing:
tigervnc-server x86_64 1.12.0-5.el8 appstream 285 k
Installing dependencies:
tigervnc-license noarch 1.12.0-5.el8 appstream 40 k
tigervnc-selinux noarch 1.12.0-5.el8 appstream 48 k
tigervnc-server-minimal x86_64 1.12.0-5.el8 appstream 1.1 M
Transaction Summary
==============================================================================================================
Install 4 Packages
Total download size: 1.5 M
Installed size: 3.4 M
Is this ok [y/N]: y
Downloading Packages:
(1/4): tigervnc-license-1.12.0-5.el8.noarch.rpm 223 kB/s | 40 kB 00:00
(2/4): tigervnc-selinux-1.12.0-5.el8.noarch.rpm 216 kB/s | 48 kB 00:00
(3/4): tigervnc-server-1.12.0-5.el8.x86_64.rpm 982 kB/s | 285 kB 00:00
(4/4): tigervnc-server-minimal-1.12.0-5.el8.x86_64.rpm 4.9 MB/s | 1.1 MB 00:00
--------------------------------------------------------------------------------------------------------------
Total 2.7 MB/s | 1.5 MB 00:00
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Running scriptlet: tigervnc-selinux-1.12.0-5.el8.noarch 1/4
Installing : tigervnc-selinux-1.12.0-5.el8.noarch 1/4
Running scriptlet: tigervnc-selinux-1.12.0-5.el8.noarch 1/4
Installing : tigervnc-license-1.12.0-5.el8.noarch 2/4
Installing : tigervnc-server-minimal-1.12.0-5.el8.x86_64 3/4
Installing : tigervnc-server-1.12.0-5.el8.x86_64 4/4
Running scriptlet: tigervnc-server-1.12.0-5.el8.x86_64 4/4
Verifying : tigervnc-license-1.12.0-5.el8.noarch 1/4
Verifying : tigervnc-selinux-1.12.0-5.el8.noarch 2/4
Verifying : tigervnc-server-1.12.0-5.el8.x86_64 3/4
Verifying : tigervnc-server-minimal-1.12.0-5.el8.x86_64 4/4
Installed:
tigervnc-license-1.12.0-5.el8.noarch tigervnc-selinux-1.12.0-5.el8.noarch
tigervnc-server-1.12.0-5.el8.x86_64 tigervnc-server-minimal-1.12.0-5.el8.x86_64
Complete!
Edit /etc/tigervnc/vncserver.users to enable the admin access via VNC.
diff -u /root/vncserver.users /etc/tigervnc/vncserver.users
--- /root/vncserver.users 2022-08-17 13:59:09.924844674 -0400
+++ /etc/tigervnc/vncserver.users 2022-08-17 14:02:37.893980059 -0400
@@ -5,4 +5,4 @@
#
# :2=andrew
# :3=lisa
-
+:2=admin
Now edit to enable defaults.
diff -u /root/vncserver-config-mandatory /etc/tigervnc/vncserver-config-mandatory
--- /root/vncserver-config-mandatory 2022-08-17 13:53:31.861747957 -0400
+++ /etc/tigervnc/vncserver-config-mandatory 2022-08-17 13:58:45.678479131 -0400
@@ -9,8 +9,8 @@
# Several common settings are shown below. Uncomment and modify to your
# liking.
-# session=gnome
-# securitytypes=vncauth,tlsvnc
-# geometry=2000x1200
-# localhost
-# alwaysshared
+session=gnome
+securitytypes=vncauth,tlsvnc
+geometry=1920x1080
+localhost
+alwaysshared
| Variables | Description |
|---|---|
| session | Is set to a valid Xsession name as per configuration files in /usr/share/xsessions/ |
| securitytypes | Denotes the authentication options presented to clients |
| desktop | Sets the name of the desktop session displayed by various components, including the vnc client |
| geometry | Denotes the aspect ratio and native resolution of the session |
| localhost | Denotes the host to which the server will bind |
| alwaysshared | Sets all incoming connections as shared, regardless of client settings |
Switch to the admin user.
su - admin
Last login: Wed Aug 17 12:13:44 EDT 2022 on tty2
[admin@an-striker01 ~]$
Now run vncpasswd and enter the password you will use to connect.
vncpasswd
Password:
Verify:
Would you like to enter a view-only password (y/n)? n
A view-only password is not used
Exit back to the root user.
exit
logout
[root@an-striker01 ~]#
Now enable the daemon;
systemctl enable --now vncserver@:2.service
Created symlink /etc/systemd/system/multi-user.target.wants/vncserver@:2.service → /usr/lib/systemd/system/vncserver@.service.
Connect
Now you can try to connect!
If connecting directly to the target
Open the tunnel;
ssh -L 5902:localhost:5902 -N -f -l $user $host_name
Then on the local machine, run tigervnc, then connect to localhost:2:
If connection via a gateway ssh machine
Connect to the gateway;
- The initial 5903 is used if the source computer is already using 5902. If not, 5902 can be used. The next available port opened by default when firewalld is told to enable the vnc-server service. The 590 is then dropped, and 3 will be used for the localhost:3 later. Or you can use the full 5903.
- The 5902 is the VNC port the target is listening on.
- The 2502 is the port forward setup by the target's firewall port forwarding, and could be 22 or whatever other port the target setup.
ssh -L 5903:localhost:5902 root@gateway.example.com -p 2502
Then from the gateway, connect to the target;
ssh -L 5902:localhost:5902 root@an-striker01
- The localhost:5903 uses the same port as the initial call above. You could use localhost:3 as well.
Then on the local machine, run tigervnc, then connect to localhost:5903:
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