2. Upgrade Ambari

If you are running Ambari Metrics service in your cluster, stop the service. From Ambari Web, browse to Services > Ambari Metrics and select Stop from the Service Actions menu.
Stop the Ambari Server. On the host running Ambari Server:
ambari-server stop
Stop all Ambari Agents. On each host in your cluster running an Ambari Agent:
ambari-agent stop

Fetch the new Ambari repo and replace the old repository file with the new repository file on all hosts in your cluster.

	Important
	Check your current directory before you download the new repository file to make sure that there are no previous versions of the `ambari.repo` file. If you do not, and a previous version exists, the new download will be saved with a numeric extension, such as `ambari.repo.1`. Make sure that the version you copy is the new version.

Select the repository appropriate for your environment from the following list:

For RHEL/CentOS/Oracle Linux 6:

wget -nv http://public-repo-1.hortonworks.com/ambari/centos6/2.x/updates/2.4.0.1/ambari.repo -O /etc/yum.repos.d/ambari.repo

For RHEL/CentOS/Oracle Linux 7:

wget -nv http://public-repo-1.hortonworks.com/ambari/centos7/2.x/updates/2.4.0.1/ambari.repo -O /etc/yum.repos.d/ambari.repo

For SLES 11:

wget -nv http://public-repo-1.hortonworks.com/ambari/suse11/2.x/updates/2.4.0.1/ambari.repo -O /etc/zypp/repos.d/ambari.repo

For Ubuntu 12:

wget -nv http://public-repo-1.hortonworks.com/ambari/ubuntu12/2.x/updates/2.4.0.1/ambari.list -O /etc/apt/sources.list.d/ambari.list

For Ubuntu 14:

wget -nv http://public-repo-1.hortonworks.com/ambari/ubuntu14/2.x/updates/2.4.0.1/ambari.list -O /etc/apt/sources.list.d/ambari.list

For Debian 7:

wget -nv http://public-repo-1.hortonworks.com/ambari/debian7/2.x/updates/2.4.0.1/ambari.list -O /etc/apt/sources.list.d/ambari.list

	Note
	If your cluster does not have access to the Internet, set up a local repository with this data before you continue. See Using a Local Repository for more information.

	Note
	Ambari Server does not automatically turn off `iptables`. Check that your installation setup does not depend on `iptables` being disabled. After upgrading the server, you must either disable `iptables` manually or make sure that you have appropriate ports available on all cluster hosts. For more information about ports, see Configuring Network Port Numbers.

Upgrade Ambari Server. On the host running Ambari Server:

For RHEL/CentOS/Oracle Linux:
```
yum clean all
yum info ambari-server
```
In the info output, visually validate that there is an available version containing "2.4"
```
yum upgrade ambari-server
```
For SLES:
```
zypper clean
zypper info ambari-server
```
In the info output, visually validate that there is an available version containing "2.4"
```
zypper up ambari-server
```
For Ubuntu/Debian:
```
apt-get clean all
apt-get update 
apt-cache show ambari-server | grep Version 
```
In the info output, visually validate that there is an available version containing "2.4"
```
apt-get install ambari-server 
```

Important

When performing upgrade on SLES, you will see a message "There is an update candidate for 'ambari-server', but it is from different vendor. Use 'zypper install ambari-server-2.4-101.noarch' to install this candidate". You will need to to use yast to update the package, as follows:

From the command line run: > yast.
```
> yast
```
You will see command line UI for YaST program.
Choose Software > Software Management, then click the Enter button.
In the Search Phrase field, enter ambari-server, then click the Enter button.
On the right side you will see the search result ambari-server 2.4. Click Actions, choose Update, then click the Enter button.
Go to Accept, and click enter.

Check for upgrade success by noting progress during the Ambari Server installation process you started in Step 5.

As the process runs, the console displays output similar, although not identical, to the following:
```
Setting up Upgrade Process
Resolving Dependencies
--> Running transaction check
```
If the upgrade fails, the console displays output similar to the following:
```
Setting up Upgrade Process
No Packages marked for Update
```
A successful upgrade displays output similar to the following:
```
Updated:
   ambari-server.noarch 0:2.4-111 
Complete!
```

	Note
	Confirm there is only one ambari-server.jar file in `/usr/lib/ambari-server`. If there is more than one JAR file with name ambari-server.jar, move all JARs except ambari-server-2.4.*.jar to /tmp before proceeding with upgrade.

Upgrade all Ambari Agents. On each host in your cluster running an Ambari Agent:

For RHEL/CentOS/Oracle Linux:
```
yum upgrade ambari-agent
```

For SLES:

zypper up ambari-agent

	Note
	Ignore the warning that begins with "There are some running programs that use files deleted by recent upgrade".

Important

When performing upgrade on SLES, you will see a message "There is an update candidate for 'ambari-agent', but it is from different vendor. Use 'zypper install ambari-agent-2.4-101.noarch' to install this candidate". You will need to to use yast to update the package, as follows:

From the command line run: > yast
```
> yast
```
You will see command line UI for YaST program.
Choose Software > Software Management, then click the Enter button.
In the Search Phrase field, enter ambari-agent, then click the Enter button.
On the right side you will see the search result ambari-agent 2.4. Click Actions, choose Update, then click the Enter button.
Go to Accept, and click enter.

For Ubuntu/Debian:

apt-get update
apt-get install ambari-agent

After the upgrade process completes, check each host to make sure the new files have been installed:
- For RHEL/CentOS/Oracle Linux 6:
```
rpm -qa | grep ambari-agent
```
- For RHEL/CentOS/Oracle Linux 7:
```
rpm -qa | grep ambari-agent
```
- For SLES 11:
```
rpm -qa | grep ambari-agent
```
- For SLES 12:
```
rpm -qa | grep ambari-agent
```
- For Ubuntu 12:
```
dpkg -l ambari-agent
```
- For Ubuntu 14:
```
dpkg -l ambari-agent
```
- For Debian 7:
```
dpkg -l ambari-agent
```
Upgrade Ambari Server database schema. On the host running Ambari Server:
```
ambari-server upgrade
```
Start the Ambari Server. On the host running Ambari Server:
```
ambari-server start
```
Start all Ambari Agents. On each host in your cluster running an Ambari Agent:
```
ambari-agent start
```
Open Ambari Web.
Point your browser to http://<your.ambari.server>:8080
where <your.ambari.server> is the name of your ambari server host. For example, c6401.ambari.apache.org.
Important
Refresh your browser so that it loads the new version of the Ambari Web code. If you have problems, clear your browser cache manually, then restart Ambari Server.
Log in, using the Ambari administrator credentials that you have set up.
For example, the default name/password is admin/admin.
You will see a Restart indicator next to each service after upgrading. Ambari upgrade has added to/adjusted the configuration properties of your cluster based on new configuration types and properties being made available for each service with this release of Ambari. Review these changes by comparing the previous configuration with the latest version created by "ambari-upgrade".
If you have configured Ambari to authenticate against an external LDAP or Active Directory, you must re-run "ambari-server setup-ldap”. For more information, see Set Up LDAP or Active Directory Authentication.
If you have configured your cluster for Hive or Oozie with an external database (Oracle, MySQL or PostgreSQL), you must re-run “ambari-server setup --jdbc-db and --jdbc-driver” to get the JDBC driver JAR file in place. For more information, see Using Non-Default Databases - Hive and Using Non-Default Databases - Oozie.
If you are running Ambari Metrics service in your cluster, Upgrade Ambari Metrics service and add the Grafana component.
If your cluster includes the SmartSense service, you must upgrade it along with Ambari, Upgrade SmartSense Service.
Perform any other Post-Upgrade Tasks as required.

	Important
	Refresh your browser so that it loads the new version of the Ambari Web code. If you have problems, clear your browser cache manually, then restart Ambari Server.

​2. Upgrade Ambari