问题
[root@#localhost java-1.8.0-openjdk-1.8.0.262.b10-1.el7.x86_64]# javac -version
bash: javac: 未找到命令...
相似命令是： 'java'
[root@#localhost java-1.8.0-openjdk-1.8.0.262.b10-1.el7.x86_64]# java -version
openjdk version "1.8.0_392"
OpenJDK Runtime Environment (build 1.8.0_392-b08)
OpenJDK 64-Bit Server VM (build 25.392-b08, mixed mode)[root@#localhost ~]# /opt/cm-5.14.0/share/cmf/schema/scm_prepare_database.sh mysql -h hadoop250 -uroot -p'123456' --scm-host hadoop250 scm scm '123456'
JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.262.b10-0.el7_8.x86_64
Verifying that we can write to /opt/cm-5.14.0/etc/cloudera-scm-server
/opt/cm-5.14.0/share/cmf/schema/scm_prepare_database.sh:行379: /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.262.b10-0.el7_8.x86_64/bin/java: 没有那个文件或目录
--> Error 127, giving up (use --force if you wish to ignore the error)[root@#localhost ~]# cd /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.262.b10-1.el7.x86_64/
[root@#localhost java-1.8.0-openjdk-1.8.0.262.b10-1.el7.x86_64]# ls
jre[root@#localhost java-1.8.0-openjdk-1.8.0.262.b10-1.el7.x86_64]# javac -version
bash: javac: 未找到命令...
相似命令是： 'java'
[root@#localhost java-1.8.0-openjdk-1.8.0.262.b10-1.el7.x86_64]# java -version
openjdk version "1.8.0_392"
OpenJDK Runtime Environment (build 1.8.0_392-b08)
OpenJDK 64-Bit Server VM (build 25.392-b08, mixed mode)
[root@#localhost java-1.8.0-openjdk-1.8.0.262.b10-1.el7.x86_64]# 原因：
openjdk安装完只有默认的运行环境，没有开发环境
解决办法：
1，运行一下代码安装jdk开发环境
yum install java-1.8.0-openjdk-devel.x86_64
2，配置环境变量
参考
#set java environment
export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.292.b10-0.el8_3.x86_64
export JRE_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.292.b10-0.el8_3.x86_64/jre
export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
export PATH=$PATH:$JRE_HOME/bin:$JAVA_HOME/bin我的
单独列出配置文件吧，方便看
[root@#localhost java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64]# cat /etc/profile.d/myenv.sh
#jdk
#export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.262.b10-0.el7_8.x86_64
#java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64
#/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin[root@#localhost ~]# cd /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64
[root@#localhost java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64]# ls
jre
[root@#localhost java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64]# yum install java-1.8.0-openjdk-devel.x86_64[root@#localhost java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64]# ls
ASSEMBLY_EXCEPTION bin include jre lib LICENSE tapset THIRD_PARTY_README[root@#localhost java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64]# pwd
/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64
[root@#localhost java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64]# vim /etc/profile.d/myenv.sh
[root@#localhost java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64]# cat /etc/profile.d/myenv.sh
#jdk
#export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.262.b10-0.el7_8.x86_64
#java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64
#/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64
export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin
[root@#localhost java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64]# ls
ASSEMBLY_EXCEPTION bin include jre lib LICENSE tapset THIRD_PARTY_README
[root@#localhost java-1.8.0-openjdk-1.8.0.392.b08-2.el7_9.x86_64]# source etc/profile
然后javac -version能正常运行了
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