1.最近想整理点大数据知识，使用ambari工具搭建hadoop，将来再搭建spark，storm其他组件。
环境列表，四台centos7
/etc/hosts的配置：
172.16.192.130 hadoop1
172.16.192.129 hadoop2
172.16.192.131 hadoop3
172.16.192.132 ambari-server
ambari-server向hadoop1，hadoop2，hadoop3搭建hadoop节点
2.Ambari-server免密登录hadoop1，hadoop2，hadoop3配置
在ambari-server节点生成密钥，和免密命令
（1）ssh-keygen
（2）ssh-copy-id hadoop1
（3）ssh-copy-id hadoop2
（4）ssh-copy-id hadoop3
同理,hadoop1，hadoop2，hadoop3也要无密码能登录ambari-server
- 安装ambari私有源，
（1）下载ambari源
wget http://public-repo-1.hortonworks.com/ambari/centos7/2.x/updates/2.4.2.0/ambari.repo
（2）拷贝ambari.repo /etc /yum/repos.d
cp ambari.repo. /etc /yum/repos.d/
（3）清除现有源和查看源
yum clean all
yum list | grep ambari
（4）安装ambari
(4) 安装ambari-server
sudo yum install ambari-server
下载jdk,设置数据库，我使用的mariadb，需要拷贝jar到/usr/share/java
(5) 安装mariadb
sudo yum install mariadb-server mariadb-client
创建数据库：ambari，并创立权限
grant all privileges on . to ambari@'%' identified by 'bigdata' with grant option;
grant all privileges on . to ambari@'ambari-server' identified by 'bigdata' with grant option;
flush privileges;
(6)安装成功,设置ambari：
sudo ambari-server setup
说明，一律采用默认配置
【1】数据库类型mysql：mariadb 用户名 ambari 密码（默认）bigdata
[botter@ambari-server ~]$ sudo ambari-server setup
[sudo] password for botter:
Using python /usr/bin/python
Setup ambari-server
Checking SELinux...
SELinux status is 'enabled'
SELinux mode is 'permissive'
WARNING: SELinux is set to 'permissive' mode and temporarily disabled.
OK to continue [y/n] (y)? y
Customize user account for ambari-server daemon [y/n] (n)? y
Enter user account for ambari-server daemon (botter):
Adjusting ambari-server permissions and ownership...
Checking firewall status...
WARNING: iptables is running. Confirm the necessary Ambari ports are accessible. Refer to the Ambari documentation for more details on ports.
OK to continue [y/n] (y)? y
Checking JDK...
Do you want to change Oracle JDK [y/n] (n)? y
[1] Oracle JDK 1.8 + Java Cryptography Extension (JCE) Policy Files 8
[2] Oracle JDK 1.7 + Java Cryptography Extension (JCE) Policy Files 7
[3] Custom JDK
==============================================================================
Enter choice (1): 1
JDK already exists, using /var/lib/ambari-server/resources/jdk-8u77-linux-x64.tar.gz
Installing JDK to /usr/jdk64/
Successfully installed JDK to /usr/jdk64/
JCE Policy archive already exists, using /var/lib/ambari-server/resources/jce_policy-8.zip
Installing JCE policy...
Completing setup...
Configuring database...
Enter advanced database configuration [y/n] (n)? y
Configuring database...
==============================================================================
Choose one of the following options:
[1] - PostgreSQL (Embedded)
[2] - Oracle
[3] - MySQL / MariaDB
[4] - PostgreSQL
[5] - Microsoft SQL Server (Tech Preview)
[6] - SQL Anywhere
[7] - BDB
==============================================================================
Enter choice (3): 3
Hostname (localhost):
Port (3306):
Database name (ambari):
Username (ambari):
Enter Database Password (bigdata):
Configuring ambari database...
Copying JDBC drivers to server resources...
Configuring remote database connection properties...
WARNING: Before starting Ambari Server, you must run the following DDL against the database to create the schema: /var/lib/ambari-server/resources/Ambari-DDL-MySQL-CREATE.sql
Proceed with configuring remote database connection properties [y/n] (y)? y
Extracting system views...
ambari-admin-2.4.2.0.136.jar
............
Adjusting ambari-server permissions and ownership...
Ambari Server 'setup' completed successfully.
【2】遇到的坑
连接不上数据库：，找到ambari-server的配置目录，修改去。
[botter@ambari-server tools]$ whereis ambari-server
ambari-server: /usr/sbin/ambari-server.py /usr/sbin/ambari-server /usr/lib/ambari-server /etc/ambari-server
（1）修改mysql 连接配置:/etc/ambari-server/conf/ambari.properties,搜索mysql关键字，修改mysql的连接url
（2）导入sql，sql的路径：/var/lib/ambari-server/resources/Ambari-DDL-MySQL-CREATE.sql
[root@ambari-server ambari-server]# mysql
Welcome to the MariaDB monitor. Commands end with ; or \g.
Your MariaDB connection id is 440
Server version: 5.5.56-MariaDB MariaDB Server
Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MariaDB [(none)]> create database ambari;
Query OK, 1 row affected (0.00 sec)
MariaDB [(none)]> use ambari;
Database changed
MariaDB [ambari]> source /var/lib/ambari-server/resources/Ambari-DDL-MySQL-CREATE.sql
配置和启动完成的标志：端口是8080
Make sure that you include only one mysql-connector-java.jar in the java class path '/etc/ambari-server/conf:/usr/lib/ambari-server/*:/usr/share/java/mysql-connector-java.jar'.
Ambari database consistency check started...
No errors were found.
Ambari database consistency check finished
Server PID at: /var/run/ambari-server/ambari-server.pid
Server out at: /var/log/ambari-server/ambari-server.out
Server log at: /var/log/ambari-server/ambari-server.log
Waiting for server start....................
Ambari Server 'start' completed successfully.
平台登录：http://localhost:8080/ 默认用户和密码均是admin
