Install Ambari 2.2.0 from Public Repositories（Hadoop）

Step1: Download the Ambari repository on the Ambari Server host

For Redhat/CentOS/Oracle:

cd /etc/yum.repos.d/

wget <ambari-repo-url>

For SUSE:

cd /etc/zypp/repos.d

wget <ambari-repo-url>

For Ubuntu/Debian:

cd /etc/apt/sources.list.d

wget <ambari-repo-url>

Choose an appropriate <ambari-repo-url> based on the platform used:

https://docs.hortonworks.com/HDPDocuments/Ambari-2.2.0.0/bk_Installing_HDP_AMB/content/_ambari_repositories.html

Ambari 2.2 Repositories

OS	Format	URL
RedHat 6 CentOS 6 Oracle Linux 6	Base URL	http://public-repo-1.hortonworks.com/ambari/centos6/2.x/updates/2.2.0.0
	Repo File	http://public-repo-1.hortonworks.com/ambari/centos6/2.x/updates/2.2.0.0/ambari.repo
	Tarball md5 \|asc	http://public-repo-1.hortonworks.com/ambari/centos6/2.x/updates/2.2.0.0/ambari-2.2.0.0-centos6.tar.gz
RedHat 7 CentOS 7 Oracle Linux 7	Base URL	http://public-repo-1.hortonworks.com/ambari/centos7/2.x/updates/2.2.0.0
	Repo File	http://public-repo-1.hortonworks.com/ambari/centos7/2.x/updates/2.2.0.0/ambari.repo
	Tarball md5 \|asc	http://public-repo-1.hortonworks.com/ambari/centos7/2.x/updates/2.2.0.0/ambari-2.2.0.0-centos7.tar.gz
SLES 11	Base URL	http://public-repo-1.hortonworks.com/ambari/suse11/2.x/updates/2.2.0.0
	Repo File	http://public-repo-1.hortonworks.com/ambari/suse11/2.x/updates/2.2.0.0/ambari.repo
	Tarball md5 \|asc	http://public-repo-1.hortonworks.com/ambari/suse11/2.x/updates/2.2.0.0/ambari-2.2.0.0-suse11.tar.gz
Ubuntu 12	Base URL	http://public-repo-1.hortonworks.com/ambari/ubuntu12/2.x/updates/2.2.0.0
	Repo File	http://public-repo-1.hortonworks.com/ambari/ubuntu12/2.x/updates/2.2.0.0/ambari.list
	Tarball md5 \|asc	http://public-repo-1.hortonworks.com/ambari/ubuntu12/2.x/updates/2.2.0.0/ambari-2.2.0.0-ubuntu12.tar.gz
Ubuntu 14	Base URL	http://public-repo-1.hortonworks.com/ambari/ubuntu14/2.x/updates/2.2.0.0
	Repo File	http://public-repo-1.hortonworks.com/ambari/ubuntu14/2.x/updates/2.2.0.0/ambari.list
	Tarball md5 \|asc	http://public-repo-1.hortonworks.com/ambari/ubuntu14/2.x/updates/2.2.0.0/ambari-2.2.0.0-ubuntu14.tar.gz
Debian 7	Base URL	http://public-repo-1.hortonworks.com/ambari/debian7/2.x/updates/2.2.0.0
	Repo File	http://public-repo-1.hortonworks.com/ambari/debian7/2.x/updates/2.2.0.0/ambari.list
	Tarball md5 \|asc	http://public-repo-1.hortonworks.com/ambari/debian7/2.x/updates/2.2.0.0/ambari-2.2.0.0-debian7.tar.gz

Step 2: Install, Setup, and Start Ambari Server

Install Ambari Server from the public Ambari repository:

For Redhat/CentOS/Oracle:

yum install ambari-server

如果遇到 Another app is currently holding the yum lock; waiting for it to exit. 可以通过执行rm -rf /var/run/yum.pid 来强行解除锁定

For SUSE:

zypper install ambari-server

For Ubuntu/Debian:

apt-key adv --recv-keys --keyserver keyserver.ubuntu.com B9733A7A07513CAD

apt-get update

apt-get install ambari-server

Run the setup command to configure your Ambari Server, Database, JDK, LDAP, and other options:

ambari-server setup

Fixed a warnings：

--------------------------------------------------------------

A. Close SELinux：

1、临时关闭（不用重启机器）：

setenforce 0 ##设置SELinux 成为permissive模式

##setenforce 1 设置SELinux 成为enforcing模式

2、修改配置文件需要重启机器：

修改/etc/selinux/config 文件

将SELINUX=enforcing改为SELINUX=disabled

重启机器即可

--------------------------------------------------------------------------

B. Close iptables

1. Linux防火墙(Iptables)重启系统生效

开启： chkconfig iptables on
关闭： chkconfig iptables off

2.Linux防火墙(Iptables) 即时生效，重启后失效

开启： service iptables start
关闭： service iptables stop

--------------------------------------------------------------------------

Start Ambari Server:

ambari-server start

Step 3: Deploy Cluster using Ambari Web UI

Open up a web browser and go to http://<ambari-server-host>:8080.

ssh 无密码登录要使用公钥与私钥。linux下可以用用ssh-keygen生成公钥/私钥对，下面我以CentOS为例。
有机器A(192.168.1.155)，B(192.168.1.181)。现想A通过ssh免密码登录到B。首先以root账户登陆为例。

1.在A机下生成公钥/私钥对。

[root@A ~]# ssh-keygen -t rsa -P ''

-P表示密码，-P '' 就表示空密码，也可以不用-P参数，这样就要三车回车，用-P就一次回车。该命令将在/root/.ssh目录下面产生一对密钥id_rsa和id_rsa.pub。

一般采用的ssh的rsa密钥: id_rsa 私钥 id_rsa.pub 公钥下述命令产生不同类型的密钥 ssh-keygen -t dsa ssh-keygen -t rsa ssh-keygen -t rsa1
2.把A机下的/root/.ssh/id_rsa.pub 复制到B机的 /root/.ssh/authorized_keys文件里，先要在B机上创建好 /root/.ssh 这个目录，用scp复制。

[root@A ~]# scp /root/.ssh/id_rsa.pub root@192.168.1.181:/root/.ssh/authorized_keys root@192.168.1.181's password: id_rsa.pub 100% 223 0.2KB/s 00:

由于还没有免密码登录的，所以要输入一次B机的root密码。
3.authorized_keys的权限要是600!!!

[root@B ~]# chmod 600 /root/.ssh/authorized_keys

[dave@caprice dave]$ ssh 192.168.1.3 -v

  [I edited out the verbose output, and entered the password]

  [Remember kids, always use -v so dont try this at home :) ]

[dave@julia dave]$ mkdir .ssh

[dave@julia dave]$ chmod 700 .ssh

[dave@julia dave]$ cd .ssh

[dave@julia .ssh]$ touch authorized_keys

[dave@julia .ssh]$ chmod 600 authorized_keys

[dave@julia .ssh]$ cat ../identity.pub >> authorized_keys

[dave@julia .ssh]$ rm ../identity.pub

//错误：INFO 2016-01-07 11:52:03,525 NetUtil.py:60 - Connecting to https://ha0.ggz.bluefir:8440/ca的解决方法：

如果已经错了，可以去每台机器/etc/ambari-agent/conf/ambari-agent.ini修改ambari-server主机信息

//设置jdk：ambari-server setup -j /opt/jdk1.8/

//解决openssl错误：yum update openssl

//手工安装ambari-agent的步骤

RHEL/CentOS/Oracle Linux 6

Install the Ambari Agent on every host in your cluster.

yum install ambari-agent
Using a text editor, configure the Ambari Agent by editing the ambari-agent.ini file as shown in the following example:

vi /etc/ambari-agent/conf/ambari-agent.ini

[server] hostname=<your.ambari.server.hostname>

url_port=8440

secured_url_port=8441
Start the agent on every host in your cluster.

ambari-agent start

The agent registers with the Server on start.

//遇到The following hosts have Transparent Huge Pages (THP) enabled. THP should be disabled to avoid potential Hadoop performance issues.错误的解决方法：

解决办法,在Linux下执行：

echo never > /sys/kernel/mm/redhat_transparent_hugepage/defrag

echo never > /sys/kernel/mm/redhat_transparent_hugepage/enabled

echo never > /sys/kernel/mm/transparent_hugepage/enabled

echo never > /sys/kernel/mm/transparent_hugepage/defrag