Xmanager远程桌面CentOS 7
1.安装 lightdm
sudo yum install lightdm2.配置 lightdm，如果不存在，则创建之
sudo vi /etc/lightdm/lightdm.conf内容如下：
[XDMCPServer] enabled=true port=1773.修改默认 display manager 为 lightdm
sudo systemctl disable gdm sudo systemctl enable lightdm4.开始 lightdm，注意，有可能会黑屏，我的是闪屏闪了一断时间后黑屏，不想等，重启后好了。
sudo systemctl start lightdm5.关闭防火墙，或自行开启177端口
sudo systemctl stop firewalld.service6.安装xfce
sudo yum groupinstall xfce7.xmanager选项
由于用到xfce，用xdmcp界面进不去，会直接崩溃掉。而用xstart是可以的，但是界面是支离破碎的，只有2个面板，然后打开某个界面后绘制相应的界面。
配置如下图：
7.效果图
xdmcp图片。注意这个输入密码后会闪退。目前还未找到解决方案。。。。。
可用的如下：
看到图形片正中下方的面板没有，这个是远程的机器上的，点了终端然后弹出了终端的界面，正中间那个界面就是远端机器上的。。。。是不是感觉很不一样。。。。图形界面打散了以元素的形式传递过来了。。。。
8.附上详细配置说明
/etc/lightdm/lightdm.conf
# # General configuration # # start-default-seat = True to always start one seat if none are defined in the configuration # greeter-user = User to run greeter as # minimum-display-number = Minimum display number to use for X servers # minimum-vt = First VT to run displays on # lock-memory = True to prevent memory from being paged to disk # user-authority-in-system-dir = True if session authority should be in the system location # guest-account-script = Script to be run to setup guest account # logind-load-seats = True to automatically set up multi-seat configuration from logind # logind-check-graphical = True to on start seats that are marked as graphical by logind # log-directory = Directory to log information to # run-directory = Directory to put running state in # cache-directory = Directory to cache to # sessions-directory = Directory to find sessions # remote-sessions-directory = Directory to find remote sessions # greeters-directory = Directory to find greeters # backup-logs = True to move add a .old suffix to old log files when opening new ones # [LightDM] start-default-seat=true greeter-user=lightdm #minimum-display-number=0 minimum-vt=1 #lock-memory=true user-authority-in-system-dir=true #guest-account-script=guest-account #logind-load-seats=false #logind-check-graphical=false #log-directory=/var/log/lightdm #run-directory=/var/run/lightdm #cache-directory=/var/cache/lightdm #sessions-directory=/usr/share/lightdm/sessions:/usr/share/xsessions #remote-sessions-directory=/usr/share/lightdm/remote-sessions #greeters-directory=/usr/share/lightdm/greeters:/usr/share/xgreeters #backup-logs=true # # Seat defaults # # type = Seat type (xlocal, xremote) # xdg-seat = Seat name to set pam_systemd XDG_SEAT variable and name to pass to X server # pam-service = PAM service to use for login # pam-autologin-service = PAM service to use for autologin # pam-greeter-service = PAM service to use for greeters # xserver-command = X server command to run (can also contain arguments e.g. X -special-option) # xmir-command = Xmir server command to run (can also contain arguments e.g. Xmir -special-option) # xserver-layout = Layout to pass to X server # xserver-config = Config file to pass to X server # xserver-allow-tcp = True if TCP/IP connections are allowed to this X server # xserver-share = True if the X server is shared for both greeter and session # xserver-hostname = Hostname of X server (only for type=xremote) # xserver-display-number = Display number of X server (only for type=xremote) # xdmcp-manager = XDMCP manager to connect to (implies xserver-allow-tcp=true) # xdmcp-port = XDMCP UDP/IP port to communicate on # xdmcp-key = Authentication key to use for XDM-AUTHENTICATION-1 (stored in keys.conf) # unity-compositor-command = Unity compositor command to run (can also contain arguments e.g. unity-system-compositor -special-option) # unity-compositor-timeout = Number of seconds to wait for compositor to start # greeter-session = Session to load for greeter # greeter-hide-users = True to hide the user list # greeter-allow-guest = True if the greeter should show a guest login option # greeter-show-manual-login = True if the greeter should offer a manual login option # greeter-show-remote-login = True if the greeter should offer a remote login option # user-session = Session to load for users # allow-user-switching = True if allowed to switch users # allow-guest = True if guest login is allowed # guest-session = Session to load for guests (overrides user-session) # session-wrapper = Wrapper script to run session with # greeter-wrapper = Wrapper script to run greeter with # guest-wrapper = Wrapper script to run guest sessions with # display-setup-script = Script to run when starting a greeter session (runs as root) # display-stopped-script = Script to run after stopping the display server (runs as root) # greeter-setup-script = Script to run when starting a greeter (runs as root) # session-setup-script = Script to run when starting a user session (runs as root) # session-cleanup-script = Script to run when quitting a user session (runs as root) # autologin-guest = True to log in as guest by default # autologin-user = User to log in with by default (overrides autologin-guest) # autologin-user-timeout = Number of seconds to wait before loading default user # autologin-session = Session to load for automatic login (overrides user-session) # autologin-in-background = True if autologin session should not be immediately activated # exit-on-failure = True if the daemon should exit if this seat fails # [SeatDefaults] #type=xlocal #xdg-seat=seat0 #pam-service=lightdm #pam-autologin-service=lightdm-autologin #pam-greeter-service=lightdm-greeter xserver-command=X -background none #xmir-command=Xmir #xserver-layout= #xserver-config= xserver-allow-tcp=true #xserver-share=true #xserver-hostname= #xserver-display-number= #xdmcp-manager= xdmcp-port=177 #xdmcp-key= #unity-compositor-command=unity-system-compositor #unity-compositor-timeout=60 greeter-session=lightdm-greeter #greeter-hide-users=false #greeter-allow-guest=true greeter-show-manual-login=true #greeter-show-remote-login=true #user-session=default #allow-user-switching=true #allow-guest=true #guest-session= session-wrapper=/etc/X11/xinit/Xsession #greeter-wrapper= #guest-wrapper= #display-setup-script= #display-stopped-script= #greeter-setup-script= #session-setup-script= #session-cleanup-script= #autologin-guest=false #autologin-user= #autologin-user-timeout=0 #autologin-in-background=false #autologin-session=UNIMPLEMENTED #exit-on-failure=false # # Seat configuration # # Each seat must start with "Seat:". # Uses settings from [SeatDefaults], any of these can be overriden by setting them in this section. # #[Seat:0] # # XDMCP Server configuration # # enabled = True if XDMCP connections should be allowed # port = UDP/IP port to listen for connections on # listen-address = Host/address to listen for XDMCP connections (use all addresses if not present) # key = Authentication key to use for XDM-AUTHENTICATION-1 or blank to not use authentication (stored in keys.conf) # # The authentication key is a 56 bit DES key specified in hex as 0xnnnnnnnnnnnnnn. Alternatively # it can be a word and the first 7 characters are used as the key. # [XDMCPServer] enabled=true port=177 #listen-address= #key= # # VNC Server configuration # # enabled = True if VNC connections should be allowed # command = Command to run Xvnc server with # port = TCP/IP port to listen for connections on # listen-address = Host/address to listen for VNC connections (use all addresses if not present) # width = Width of display to use # height = Height of display to use # depth = Color depth of display to use # [VNCServer] #enabled=false #command=Xvnc #port=5900 #listen-address= #width=1024 #height=768 #depth=8