环境准备：
linux版本：阿里云ecs，Red Hat 4.8.5，四台机器（一台主节点，三台从节点）
cdh版本：cdh-6.1.0-install-soft.tar.gz，离线安装
java版本： jdk1.8.0_181-cloudera.tar.gz
关闭防火墙
systemctl stop firewalld 关闭防火墙
systemctl disable firewalld 禁止防火墙开机自启
vi /etc/selinux/config —> SELINUX=disabled (修改)配置主节点到其他节点免密登录
cdh01上执行：
# 生成秘钥
ssh-keygen
# 拷贝秘钥
ssh-copy-id cdh02
ssh-copy-id cdh03安装oracle jdk
# 查询已安装的java
rpm -qa | grep java
# 卸载
yum remove java*#上传jdk压缩包并解压到/use/java/路径下
tar -zxvf jdk1.8.0_181-cloudera.tar.gz# 配置环境变量
vi /etc/profile
#末尾添加
export JAVA_HOME=/usr/java/jdk1.8.0_181-cloudera/
export CLASSPATH=.:$CLASSPATH:$JAVA_HOME/lib
export PATH=$PATH:$JAVA_HOME/bin#验证
source /etc/profile
java -version安装mysql
cdh01上执行：
卸载原生的mariadb
rpm -qa|grep mariadb
rpm -e --nodeps mariadb-libs-5.5.65-1.el7.x86_64在线安装mysql：
# 安装wget下载工具
yum install wget# 下载mysql RPM 源
wget https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm# 安装mysql rpm源
yum -y localinstall mysql57-community-release-el7-11.noarch.rpm# 安装mysql 服务(稍微慢点)
yum -y install mysql-community-server# 设置服务自启
systemctl start mysqld
systemctl enable mysqld# 寻找默认生成的密码（会看到密码）
grep 'password' /var/log/mysqld.log# 登录mysql，修改root密码
mysql ‐uroot ‐pmysql> SET PASSWORD = PASSWORD('ABC123abc.123');# 开启root用户远程登录权限
mysql> grant all privileges on *.* to 'root'@'%' identified by 'ABC123abc.123' with grant option;
mysql> flush privileges;# 创建库(后续安装服务等使用)
create database cmserver default charset utf8 collate utf8_general_ci;
grant all on cmserver.* to 'root'@'%' identified by 'ABC123abc.123';#给hive
create database metastore default charset utf8 collate utf8_general_ci;
grant all on metastore.* to 'root'@'%' identified by 'ABC123abc.123';# 给CM的activity mornitor
create database amon default charset utf8 collate utf8_general_ci;
grant all on amon.* to 'root'@'%' identified by 'ABC123abc.123';# 给CM的Reports Manager
create database rman default charset utf8 collate utf8_general_ci;
grant all on rman.* to 'root'@'%' identified by 'ABC123abc.123';create database oozie default charset utf8 collate utf8_general_ci;
grant all on oozie.* to 'root'@'%' identified by 'ABC123abc.123';create database hue default charset utf8 collate utf8_general_ci;
grant all on hue.* to 'root'@'%' identified by 'ABC123abc.123';安装Httpd服务
cdh01上执行
yum install httpd
systemctl start httpd
#设置httpd服务开机自启
systemctl enable httpd.service 
