1. Upgrading From older Ambari Server versions to 1.2.5

This process upgrades Ambari Server from older, 1.x versions to version 1.2.5. It does not change the underlying Hadoop Stack. This is a 12-step manual process.

	Note
	You must know the location of the Nagios server for Step 9. Use the Services View-> Summary panel to locate the host on which it is running.

Stop the Ambari Server and all Ambari Agents. From the Ambari Server host:
```
ambari-server stop
```
From each Ambari Agent host:
```
ambari-agent stop
```

Get the new Ambari bits. Use wget to fetch the repository file and replace the old repository file with the new repository file on every host.

Fetch the new repository file:

For RHEL/CentOS 5/Oracle Linux 5

wget http://public-repo-1.hortonworks.com/ambari/centos5/1.x/updates/1.2.5.17/ambari.repo

For RHEL/CentOS 6/Oracle Linux 6

wget http://public-repo-1.hortonworks.com/ambari/centos6/1.x/updates/1.2.5.17/ambari.repo

For SLES 11

wget http://public-repo-1.hortonworks.com/ambari/suse11/1.x/updates/1.2.5.17/ambari.repo

	Important
	Check your current directory before you download the new repository file to make sure that there are no previous versions of the 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.

Replace the old repository file with the new repository file.
For RHEL/CentOS 5/Oracle Linux 5
```
cp ambari.repo /etc/yum.repos.d/ambari.repo
```
For RHEL/CentOS 6/Oracle Linux 6
```
cp ambari.repo /etc/yum.repos.d/ambari.repo
```
For SLES 11
```
cp ambari.repo /etc/zypp/repos.d/ambari.repo
```

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

Upgrade Ambari Server. From the Ambari Server host:

RHEL/CentOS/Oracle Linux

yum clean all
yum upgrade ambari-server-1.2.5.17 ambari-log4j-1.2.5.17

SLES

zypper clean
zypper up ambari-server-1.2.5.17 ambari-log4j-1.2.5.17

Check for upgrade success:

As the process runs, the console should produce output similar, although not identical, to this:

Setting up Upgrade Process
Resolving Dependencies
--> Running transaction check
---> Package ambari-agent.x86_64 0:1.2.2.3-1 will be updated
---> Package ambari-agent.x86_64 0:1.2.2.4-1 will be updated ...
---> Package ambari-agent.x86_64 0:1.2.2.5-1 will be an update ...

After the process is complete, check each host to make sure the new 1.2.4 files have been installed:

rpm -qa | grep ambari

If the upgrade fails, the console should produce output similar to this:
```
Setting up Upgrade Process
No Packages marked for Update
```

Check to see if you have a folder named /etc/ambari-server/conf.save. If you do, rename it back:
```
mv /etc/ambari-server/conf.save /etc/ambari-server/conf
```
Upgrade the Ambari Server schema. From the Ambari Server host:
```
ambari-server upgrade
```
Upgrade the Ambari Agent on all hosts. From each Ambari Agent host:
- RHEL/CentOS/Oracle Linux
```
yum upgrade ambari-agent ambari-log4j
```
- SLES
```
zypper up ambari-agent ambari-log4j
```
  Note
  If you get a warning that begins "There are some running programs that use files deleted by recent upgrade" you can ignore it.
Check to see if you have a file named /etc/ambari-agent/conf.save on each Agent host. If you do, rename it back. On each Agent host:
```
mv /etc/ambari-agent/conf.save /etc/ambari-agent/conf
```

Upgrade the Nagios and Ganglia add-ons package and restart. On the Nagios/Ganglia host:

RHEL/CentOS/Oracle Linux

yum upgrade hdp_mon_nagios_addons hdp_mon_ganglia_addons
service httpd restart

SLES

zypper up hdp_mon_nagios_addons hdp_mon_ganglia_addons
service apache2 restart

Start the Server and the Agents on all hosts. From the Server host:
```
ambari-server start
```
From each Agent host:
```
ambari-agent start
```

Open Ambari Web. Point your browser to http://{your.ambari.server}:8080

	Important
	You need to refresh your browser so that it loads the new version of the code. Hold the Shift key down while clicking the refresh button on the browser. If you have problems, clear your browser cache manually and restart Ambari Server.

Use the Admin name and password you have set up to log in.

Re-start the Ganglia, Nagios, and MapReduce services. In Ambari Web.
1. Go to the Services View and select each service.
2. Use the Management Header to stop and re-start each service.

Legal notices

	Note
	If you get a warning that begins "There are some running programs that use files deleted by recent upgrade" you can ignore it.