向時光許愿

Linux一般不需要圖形化，但是偶爾也是需要的，基于X11協議的圖形化XDMCP很受推廣，VNC也是很不錯的。。。

前提：

關閉防火墻，不關閉需要配置177端口放行

關閉selinux,不關閉自己配置selinux上下文

00、服務端圖形化組件檢測#

yum   groupinstall   -y   'X Window System' 'Desktop'    #根據平臺不同自己選擇安裝圖形化組件包

yum   install -y gdm  xdm      #安裝xdmcp依賴包

01、調整配置文件#

vim  /etc/X11/xdm/Xaccess   

去掉這一行最前面的#號

*    #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訪問控制
#
# 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 任何主機都可以登錄

#
# 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

# GDM configuration storage

[daemon]

[security]
AllowRemoteRoot=yes #允許root登錄
DisallowTCP=false #允許客戶端使用TCP進行聯接

[xdmcp]
Enable=true
port=177

[greeter]

[chooser]

[debug]

02、Server運行方式切換#

init 5   # init 3    && init 5

看到監聽端口177，說明xdmcp服務沒問題

03、xbrowser登錄xdmcp#

[root@ldap-master ~]# ps -ef | grep 2270
root 2270 1 0 21:33 ? 00:00:00 /usr/sbin/gdm-binary -nodaemon
root 2351 2270 0 21:33 ? 00:00:00 /usr/libexec/