安装oracle时./runInstaller报错：

Could not execute auto check for display colors using command /usr/bin/xdpyinfo. Check if the DISPLAY variable is set.

具体错误信息如下:

[oracle@glxybd database]$ ./runInstaller
Starting Oracle Universal Installer...

Checking Temp space: must be greater than 120 MB.   Actual 1008384 MB    Passed
Checking swap space: must be greater than 150 MB.   Actual 16128 MB    Passed
Checking monitor: must be configured to display at least 256 colors
    >>> Could not execute auto check for display colors using command /usr/bin/xdpyinfo. Check if the DISPLAY variable is set.    Failed <<<<

Some requirement checks failed. You must fulfill these requirements before

continuing with the installation,

Continue? (y/n) [n] y

>>> Ignoring required pre-requisite failures. Continuing...
Preparing to launch Oracle Universal Installer from /tmp/OraInstall2019-11-06_11-13-35PM. Please wait ...[oracle@glxybd database]$ Exception in thread "main" java.lang.NoClassDefFoundError
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:164)
	at java.awt.Toolkit$2.run(Toolkit.java:821)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.awt.Toolkit.getDefaultToolkit(Toolkit.java:804)
	at com.jgoodies.looks.LookUtils.isLowResolution(Unknown Source)
	at com.jgoodies.looks.LookUtils.<clinit>(Unknown Source)
	at com.jgoodies.looks.plastic.PlasticLookAndFeel.<clinit>(PlasticLookAndFeel.java:122)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:242)
	at javax.swing.SwingUtilities.loadSystemClass(SwingUtilities.java:1783)
	at javax.swing.UIManager.setLookAndFeel(UIManager.java:480)
	at oracle.install.commons.util.Application.startup(Application.java:758)
	at oracle.install.commons.flow.FlowApplication.startup(FlowApplication.java:164)
	at oracle.install.commons.flow.FlowApplication.startup(FlowApplication.java:181)
	at oracle.install.commons.base.driver.common.Installer.startup(Installer.java:265)
	at oracle.install.ivw.db.driver.DBInstaller.startup(DBInstaller.java:114)
	at oracle.install.ivw.db.driver.DBInstaller.main(DBInstaller.java:132)

原因是oracle客户端ssh认证出现问题 。

当你设置的是export DISPLAY=:10.0时，执行echo $DISPLAY查看DISPLAY是正常的

但运行xterm时报错，这才是导致上面异常的原因

解决方法

root角色执行echo $DISPLAY，发现为 xxx:10.0

[root@glxybd ~]# echo $DISPLAY
localhost:10.0

xauth list找到 :10 对应的那行并复制内容

[root@glxybd ~]#  xauth list
glxybd.ctbu.edu.cn/unix:7  MIT-MAGIC-COOKIE-1  08047574ce998c3b95d87fea02ea0a9b
glxybd.ctbu.edu.cn/unix:10  MIT-MAGIC-COOKIE-1  cb15548cf27a3b2dbfe7c50b3d1b79b3

切换到oracle角色su - oracle,然后执行以下语句添加xauth到oracle认证信息中

注意：向oracle中添加时必须与root角色复制时处在同一次连接操作，不然重新连接服务器时xauth list查询时可能会变

xauth add glxybd.ctbu.edu.cn/unix:10  MIT-MAGIC-COOKIE-1  cb15548cf27a3b2dbfe7c50b3d1b79b3

执行xauth list查看oracle的xauth 信息是否成功添加

[oracle@glxybd root]$ xauth list
glxybd.ctbu.edu.cn/unix:10  MIT-MAGIC-COOKIE-1  cb15548cf27a3b2dbfe7c50b3d1b79b3

设置并查看oracle角色的DISPLAY

[oracle@glxybd root]$ export DISPLAY=:10.0
[oracle@glxybd root]$ echo $DISPLAY
:10.0

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如果配置了图形化界面可跳过直接执行./runInstaller即可成功弹出安装界面，没有配置的话不会弹出界面但也不会报错，可参考下面的图形化界面配置。

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配置图形化界面

1. 先看看是否配置，如果执行xclock报错，command not found
   yum install xorg-x11-apps
2. 安装X窗口包和字体包
   yum -y groupinstall "X Window System" "Fonts"（安装x窗口相关包，和字体显示包）
3. 安装xmanager（步骤略…），设置xshell的隧道关联xmanager
   
4. 关闭当前窗口，重新打开新的窗口进行测试
   xclock会出现时钟界面

执行./runInstaller成功打开窗口。如果未成功打开窗口但也未报错，可能是没配置图形化界面（参考上面配置步骤）。
效果图：

参考文章： Getting “Xlib: PuTTY X11 proxy: wrong authentication protocol attempted”? I have the answer 😃