安装ambari 2.7.5

参考：
文档：https://cwiki.apache.org/confluence/display/AMBARI/Installation+Guide+for+Ambari+2.7.5
经验：https://blog.csdn.net/jiajane/article/details/103952426

• 环境

1、centos7.8

2、jdk 8

tar -zxvf jdk-8u281-linux-x64.tar.gz
mv jdk1.8.0_281 /opt/tools/installed/
## /etc/profile
export JAVA_HOME=/opt/tools/installed/jdk1.8.0_281
export PATH=$JAVA_HOME/bin:$PATH

3、mvn 3.6.3

tar -zxvf apache-maven-3.6.3-bin.tar.gz
mv apache-maven-3.6.3 /opt/tools/installed/
## /etc/profile
export M2_HOME=/opt/tools/installed/apache-maven-3.6.3
export PATH=$M2_HOME/bin:$PATH

4、nodejs
yum install nodejs

5、rpm-build
yum -y install rpm-build

6、gcc-c++
yum install -y gcc-c++