If you are using Xmanager 7, you can access the Gnome3 based desktop, the default desktop of CentOS. Please refer to the following article for necessary configurations.
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Install Extra Packages for Enterprise Linux
Code Block [root@yourhost ~]# dnf install epel-release
Download lightdm-greeter and install the greeter first
(There is no greeter for lightdm in CentOS 8's epel packages. Therefore, you'll need to install lightdm-gtk-greeter from CentOS 7's epel packages. Because of dependencies, other lightdm packages will be downloaded and installed.)Code Block [root@yourhost ~]# wget https://cdn.netsarang.com/utils/lightdm-gtk-1.8.5-19.el7.x86_64.rpm https://cdn.netsarang.com/utils/lightdm-gtk-common-1.8.5-19.el7.noarch.rpm [root@yourhost ~]# dnf install ./lightdm-gtk-common-1.8.5-19.el7.noarch.rpm ./lightdm-gtk-1.8.5-19.el7.x86_64.rpm Last metadata expiration check: 1 day, 23:05:50 ago on Tue 15 Jun 2021 10:22:22 PM EDT. Dependencies resolved. ====================================================================================================================================================================================== Package Architecture Version Repository Size ====================================================================================================================================================================================== Installing: lightdm-gtk x86_64 1.8.5-19.el7 @commandline 58 k lightdm-gtk-common noarch 1.8.5-19.el7 @commandline 57 k Installing dependencies: lightdm x86_64 1.30.0-6.el8 epel 230 k lightdm-gobject x86_64 1.30.0-6.el8 epel 78 k Transaction Summary ====================================================================================================================================================================================== Install 4 Packages Total size: 423 k Total download size: 308 k Installed size: 1.2 M Is this ok [y/N]: y Downloading Packages: (1/2): lightdm-gobject-1.30.0-6.el8.x86_64.rpm 141 kB/s | 78 kB 00:00 (2/2): lightdm-1.30.0-6.el8.x86_64.rpm 167 kB/s | 230 kB 00:01 -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ... Installed products updated. Installed: lightdm-1.30.0-6.el8.x86_64 lightdm-gobject-1.30.0-6.el8.x86_64 lightdm-gtk-1.8.5-19.el7.x86_64 lightdm-gtk-common-1.8.5-19.el7.noarch Complete!
Configure lightdm.conf for XDMCP
Code Block [root@yourhost ~]# vi /etc/lightdm/lightdm.conf ... [XDMCPServer] enabled=true ...
Stop gdm and disable it to prevent it from starting after rebooting.
Code Block [root@yourhost ~]# systemctl disable gdm; systemctl stop gdm
Start lightdm and enable it to have it start after rebooting.
Code Block [root@yourhost ~]# systemctl enable lightdm; systemctl start lightdm
Disable the OS's firewall or allow UDP port 177 from the firewall's configuration.
Code Block [root@yourhost ~]# systemctl stop firewalld
How to check if XDMCP is configured properly.
Process running
Code Block [root@yourhost ~]# ps -aef |grep lightdm root 8079 1 0 05:31 ? 00:00:00 /usr/sbin/lightdm ...Port listening
Code Block [root@yourhost ~]# netstat -anep |grep :177 udp 0 0 0.0.0.0:177 0.0.0.0:* 0 90932 8079/lightdm udp6 0 0 :::177 :::* 0 90933 8079/lightdm
Checking the Firewall
The firewall status should be one of the following:
In case of an enabled firewall:Code Block [root@yourhost ~]# firewall-cmd --zone=`firewall-cmd --get-default-zone` --list-all public (active) ... ports: 177/udp ...
In case of a disabled firewall:
Code Block [root@yourhost ~]# firewall-cmd --zone=`firewall-cmd --get-default-zone` --list-all FirewallD is not running FirewallD is not running
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