Linux一般不需要图形化，但是偶尔也是需要的，基于X11协议的图形化XDMCP很受推广，VNC也是很不错的。。。
前提：
关闭防火墙，不关闭需要配置177端口放行
关闭selinux,不关闭自己配置selinux上下文
00、服务端图形化组件检测
yum groupinstall -y 'X Window System' 'Desktop' #根据平台不同自己选择安装图形化组件包
yum install -y gdm xdm #安装xdmcp依赖包
01、调整配置文件
vim /etc/X11/xdm/Xaccess
去掉这一行最前面的#号
* #any host can get a login window
[root@mvp gdm]# cat /etc/X11/xdm/Xaccess # $XdotOrg: Xaccess,v 1.3 2000/08/17 19:54:17 cpqbld Exp $ # $Xorg: Xaccess,v 1.3 2000/08/17 19:54:17 cpqbld Exp $ # $XFree86: xc/programs/xdm/config/Xaccess,v 1.4 2003/07/09 15:27:40 tsi Exp $ # # Access control file for XDMCP connections #xdmcp访问控制 # # To control Direct and Broadcast access: # # pattern # # To control Indirect queries: # # pattern list of hostnames and/or macros ... # # To use the chooser: # # pattern CHOOSER BROADCAST # # or # # pattern CHOOSER list of hostnames and/or macros ... # # To define macros: # # %name list of hosts ... # # To control which addresses xdm listens for requests on: # # LISTEN address [list of multicast groups ... ] # # The first form tells xdm which displays to respond to itself. # The second form tells xdm to forward indirect queries from hosts matching # the specified pattern to the indicated list of hosts. # The third form tells xdm to handle indirect queries using the chooser; # the chooser is directed to send its own queries out via the broadcast # address and display the results on the terminal. # The fourth form is similar to the third, except instead of using the # broadcast address, it sends DirectQuerys to each of the hosts in the list # The fifth form tells xdm which addresses to listen for incoming connections # on. If present, xdm will only listen for connections on the specified # interfaces and/or multicast groups. # # In all cases, xdm uses the first entry which matches the terminal; # for IndirectQuery messages only entries with right hand sides can # match, for Direct and Broadcast Query messages, only entries without # right hand sides can match. # * #any host can get a login window 任何主机都可以登录 # # To hardwire a specific terminal to a specific host, you can # leave the terminal sending indirect queries to this host, and # use an entry of the form: # #terminal-a host-a # # The nicest way to run the chooser is to just ask it to broadcast # requests to the network - that way new hosts show up automatically. # Sometimes, however, the chooser can't figure out how to broadcast, # so this may not work in all environments. # #* CHOOSER BROADCAST #any indirect host can get a chooser # # If you'd prefer to configure the set of hosts each terminal sees, # then just uncomment these lines (and comment the CHOOSER line above) # and edit the %hostlist line as appropriate # #%hostlist host-a host-b #* CHOOSER %hostlist # # # If you have a machine with multiple network interfaces or IP addresses # you can control which interfaces accept XDMCP packets by listing a LISTEN # line for each interface you want to listen on. You can additionally list # one or more multicast groups after each address to listen on those groups # on that address. # # If no LISTEN is specified, the default is the same as "LISTEN *" - listen on # all unicast interfaces, but not for multicast packets. If any LISTEN lines # are specified, then only the listed interfaces will be listened on. # # IANA has assigned FF0X:0:0:0:0:0:0:12B as the permanently assigned # multicast addresses for XDMCP, where X in the prefix may be replaced # by any valid scope identifier, such as 1 for Node-Local, 2 for Link-Local, # 5 for Site-Local, and so on. The default is equivalent to the example shown # here using the Link-Local version to most closely match the old IPv4 subnet # broadcast behavior. # # LISTEN * ff02:0:0:0:0:0:0:12b # This example shows listening for multicast on all scopes up to site-local # # LISTEN * ff01:0:0:0:0:0:0:12b ff02:0:0:0:0:0:0:12b ff03:0:0:0:0:0:0:12b ff04:0:0:0:0 :0:0:12b ff05:0:0:0:0:0:0:12b
vim /etc/gdm/custom.conf
[root@mvp gdm]# cat /etc/gdm/custom.conf # GDM configuration storage [daemon] [security] AllowRemoteRoot=true #许可root远程登录 [xdmcp] Enable=true Port=177 [greeter] [chooser] [debug]
02、Server运行方式切换
init 5 # init 3 && init 5
看到监听端口177，说明xdmcp服务没问题
[root@mvp xdm]# lsof -i:177 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME gdm-binar 3780 root 11u IPv4 26854 0t0 UDP *:xdmcp
03、xbrowser登录xdmcp
打开测试
