虚拟机测试环境，最小化默认安装rhel7，然后开始建用户、目录、挂载dm8安装包
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[dmdba@localhost ~]$ ls
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dm8_20210607_x86_rh6_64_ent_8.1.2.18_pack2.iso
[dmdba@localhost ~]$ cat /etc/re*se
Red Hat Enterprise Linux Server release 7.6 (Maipo)
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[dmdba@localhost ~]$ dbca.sh
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Exception: java.lang.NoClassDefFoundError thrown from the UncaughtExceptionHandler in thread "main"
安装了X11后，执行xclock没问题，检查java没有
解决方法：
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挂载os光盘
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mount -r /dev/sr0 /mnt
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cat > /etc/yum.repos.d/yum.repo<<EOF
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[RHEL77]
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name=RHEL77
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baseurl=file:///mnt
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gpgcheck=0
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EOF
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yum -y groupinstall "Server with GUI"
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