最近需要安装Oracle数据库，那就需要通过VNC来安装了
查询是否安装VNC Server
如果什么都没打印，说明没有安装vnc
安装VNC
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| yum install tigervnc
yum install tigervnc-server
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安装VNC Server
配置 VNC 登录密码
执行如下命令：
首次执行提示设置密码，根据提示输入两次密码即可
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You will require a password to access your desktops.
Password:
Verify:
xauth: file /root/.Xauthority does not exist
New 'OP-APM-11:1 (root)' desktop is OP-APM-11:1
Creating default startup script /root/.vnc/xstartup
Starting applications specified in /root/.vnc/xstartup
Log file is /root/.vnc/OP-APM-11:1.log
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为desktop OP-APM-11:1设置密码。
配置防火墙策略，避免因网络问题无法访问。
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| -A INPUT -m state --state NEW -m tcp -p tcp --dport 5900:5910 -j ACCEPT
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在Mac安装VNC客户端
安装Caskroom/cask/vnc-viewer
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| brew install Caskroom/cask/vnc-viewer
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| Updating Homebrew...
==> Auto-updated Homebrew!
Updated 1 tap (homebrew/php).
==> Updated Formulae
homebrew/php/adminer homebrew/php/n98-magerun2 homebrew/php/php70-xdebug homebrew/php/php71-xdebug homebrew/php/php72-xdebug
==> Tapping caskroom/cask
Cloning into '/usr/local/Homebrew/Library/Taps/caskroom/homebrew-cask'...
remote: Counting objects: 4011, done.
remote: Compressing objects: 100% (3982/3982), done.
remote: Total 4011 (delta 35), reused 722 (delta 25), pack-reused 0
Receiving objects: 100% (4011/4011), 1.37 MiB | 448.00 KiB/s, done.
Resolving deltas: 100% (35/35), done.
Tapped 0 formulae (4,020 files, 4.3MB)
==> brew cask install Caskroom/cask/vnc-viewer
==> Creating Caskroom at /usr/local/Caskroom
==> We'll set permissions properly so we won't need sudo in the future
Password:
==> Satisfying dependencies
==> Downloading https://www.realvnc.com/download/file/viewer.files/VNC-Viewer-6.17.1113-MacOSX-x86_64.dmg
#
==> Verifying checksum for Cask vnc-viewer
==> Installing Cask vnc-viewer
==> Moving App 'VNC Viewer.app' to '/Applications/VNC Viewer.app'.
?? vnc-viewer was successfully installed!
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启动VNC-Viewer链接VNC
连接vnc-viewer
此时，RHEL6.4上安装vncserver就已经完成了。