XManager图形化界面远程连接
采用Xshell的方式可以不用在CentOS系统中配置即可以相连，主要原理就是SSH连接的方式，但是XManager图形化界面远程连接是需要修改CentOS系统的。
安装桌面
有些CentOS系统没有安装图形化界面，那么在此之前需要安装图形化界面。
测试有没有安装：
rpm -qa | grep gnome
或者
yum list installed | grep gnome
查看JDK桌面环境：
[root@hidden ~]
[root@hidden ~]
如果没有安装桌面，则先安装：
yum groupinstall "Desktop"
yum groupinstall "X Window System"
遇到[y/N]全部选y即可。
修改/etc/gdm/custom.conf
# vim /etc/gdm/custom.conf
[daemon]
RemoteGreeter=/usr/libexec/gdm-simple-greeter
[security]
AllowRemoteRoot=true
[xdmcp]
Port=177
Enable=true
DisplaysPerHost=5
[greeter]
[chooser]
[debug]
修改/etc/inttab
# inittab is only used by upstart for the default runlevel.
#
# ADDING OTHER CONFIGURATION HERE WILL HAVE NO EFFECT ON YOUR SYSTEM.
#
# System initialization is started by /etc/init/rcS.conf
#
# Individual runlevels are started by /etc/init/rc.conf
#
# Ctrl-Alt-Delete is handled by /etc/init/control-alt-delete.conf
#
# Terminal gettys are handled by /etc/init/tty.conf and /etc/init/serial.conf,
# with configuration in /etc/sysconfig/init.
#
# For information on how to write upstart event handlers, or how
# upstart works, see init(5), init(8), and initctl(8).
#
# Default runlevel. The runlevels used are:
# 0 - halt (Do NOT set initdefault to this)
# 1 - Single user mode
# 2 - Multiuser, without NFS (The same as 3, if you do not have networking)
# 3 - Full multiuser mode
# 4 - unused
# 5 - X11
# 6 - reboot (Do NOT set initdefault to this)
#
id:5:initdefault:
如果原来是:
id:3:initdefault:
则把3改成5.
(# runlevel)
修改/etc/init/prefdm.conf
vim /etc/init/prefdm.conf
# prefdm - preferred display manager
#
# Starts gdm/xdm/etc by preference
#
# Do not edit this file directly. If you want to change the behaviour,
# please create a file prefdm.override and put your changes there.
start on stopped rc RUNLEVEL=5
stop on starting rc RUNLEVEL=[!5]
console output
respawn
respawn limit 10 120
#exec /etc/X11/prefdm -nodaemon
exec /usr/sbin/gdm
将exec /etc/X11/prefdm -nodaemon注释掉，然后添加exec /usr/sbin/gdm
命令行运行lsof -i 177
[root@zhuzhonghua1-c6uu8 ~]
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
gdm-binar 1664 root 11u IPv4 11186 0t0 UDP *:xdmcp
这样则说明可以采用Xmanager进行连接。
采用Xstart打开
配置会话（随便填个），主机（需要访问的主机ip地址），协议（选择SSH），用户名，密码。
执行命令中填写：/usr/bin/gnome-session –display $DISPLAY
这样就配置完成了，应该可以通过图形化界面远程对侧主机了。
添加中文支持
运行
yum groupinstall "Chinese Support"
或者
yum groupinstall Chinese-Support
之后修改/etc/sysconfig/i18n
LANG="zh_CN.UTF-8"
SYSONT="lat0-sun16"
重启操作系统即可。
安装jdk
查看是否有已安装的JDK
#rpm -qa|grep jdk
如果有东西，先删除：rpm -e –nodeps *
如果没有，继续
tar -zxvf jdk****.tar.gz
然后修改/etc/profile
vim /etc/profile
在末尾添加
export JAVA_HOME=/root/util/jdk1.7.0_75
export JRE_HOME=/root/util/jdk1.7.0_75/jre
export PATH=$PATH:/root/util/jdk1.7.0_75/bin
export CLASSPATH=./:/root/util/jdk1.7.0_75/lib:/root/util/jdk1.7.0_75/jre/lib
保存退出之后
source /etc/profile
立刻生效文件。
