Ambari Server Upgrade

You can perform the following steps to upgrade the Ambari Server.

The following steps have to be performed on the installed Ambari Server node.

Stop Infra-Solr Service

Stop the Infra-solr Service from the Ambari UI by navigate to Ambari > Infra Solr > Actions > Stop.

Stop Ambari Server and Agents

Stop the Ambari server and agents by running the following command.

Bash
    
 
ambari-server stopambari-agent stop
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Warning Stop the Ambari Agents on all nodes in the cluster.

Configuration Backup

Take a backup of the Ambari-server configs.

Bash
    
 
cp -r /etc/ambari-server/config /etc/ambari-server/conf_bkp
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Back up Ambari Database

Bash
    
 
mysqldump --databases ambari > /tmp/ambari-server_db_bckp/ambari_mysql_bckp.sql
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Erase the Ambari Server

For RHEL:

Bash
    
 
yum erase ambari-server -y
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For Ubuntu:

Bash
    
 
apt remove ambari-server -y
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Add Ambari Repo on Cluster Nodes

Back up the Old Ambari Repository

For RHEL:

Bash
    
 
mv /etc/yum.repos.d/ambari.repo /tmp/
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For Ubuntu:

Bash
    
 
mv /etc/apt/sources.list.d/ambari.list /tmp/
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Update the Repository Files

Retrieve the latest Ambari repository details from Ambari Repositories and add it to all the cluster nodes.

Update ambari.repo (RedHat) or ambari.list (Ubuntu).

For RHEL:

Bash
    
 
vim /etc/yum.repos.d/ambari.repo
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Bash
    
 
[ambari]async = 1baseurl = https://mirror.odp.acceldata.dev/ODP/rhel/Ambari-2.7.9.2-1/gpgcheck = 0name = ambari Version - ambari-2.7.9.2-1
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For Ubuntu:

Bash
    
 
vim /etc/apt/sources.list.d/ambari.list
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Bash
    
 
deb https://mirror.odp.acceldata.dev/ODP/ubuntu20/Ambari-2.7.9.2-1/ ODP main deb https://mirror.odp.acceldata.dev/ODP/ubuntu20/Ambari-2.7.9.2-1/ ODP-UTILS main
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List the New Packages

Verify the latest Ambari package for the version - 2.7.9.2-1.

For RHEL:

Bash
    
 
yum clean allyum list ambari-*
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For Ubuntu 20:

Bash
    
 
apt clean allapt list ambari-*
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Install the Updated Ambari Packages

For RHEL:

Bash
    
 
yum clean allyum install ambari-server -y
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For Ubuntu:

Bash
    
 
apt cleanapt install ambari-server -y
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Restore the Configuration Files

Copy ambari.properties and password.dat to /etc/ambari-server/conf/.

Once the installation is successful, make sure to set up the following versions.

Set up Java 11

Make sure to install and update the default Java version as 11 on all the cluster nodes.

For RHEL:

Bash
    
 
yum install java-11-openjdk.x86_64yum install java-11-openjdk-devel.x86_64
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For Ubuntu:

Bash
    
 
apt-get install openjdk-11-jdk openjdk-11-jdk-headless
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Ensure not to remove the jdk8 packages at this state.

Bash
    
​x
 
update-alternatives --config java​There are 2 choices for the alternative java (providing /usr/bin/java).​  Selection    Path                                            Priority   Status------------------------------------------------------------* 0            /usr/lib/jvm/java-11-openjdk-amd64/bin/java      1111      auto mode  1            /usr/lib/jvm/java-11-openjdk-amd64/bin/java      1111      manual mode  2            /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java   1081      manual mode​Press <enter> to keep the current choice[*], or type selection number: 1
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Set up Python 3.11

Bash
    
 
yum install python3.11
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Make sure to install and update the default Python version as 3.11 on all the cluster nodes.

Bash
    
 
update-alternatives --config python​There are 4 programs which provide 'python'.  Selection    Command-----------------------------------------------*  1           /usr/libexec/no-python   2           /usr/bin/python3   3           /usr/bin/python2 + 4           /usr/bin/python3.11Enter to keep the current selection[+], or type selection number: 4
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Update JSVC

Make sure to Instal the latest version of the bigtop-jsvc-1.2.4 on all the cluster nodes.

For RHEL:

Bash
    
 
yum install bigtop-jsvc* -y
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For Ubuntu:

Bash
    
 
apt install bigtop-jsvc
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Restore Config Files

Restore the ambari.properties and password.dat files, which are backed-up at this step: Configuration Backup#configuration-backup.

Restore ambari.properties file

Bash
    
 
cp /etc/ambari-server/conf_bkp/ambari.properties /etc/ambari-server/conf/
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Please override the file by prompting 'y'.

Restore password.dat file

Bash
    
 
cp /etc/ambari-server/conf_bkp/password.dat /etc/ambari-server/conf/
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Update the java.home and Stack.java.home

In this case, set JAVA_HOME to /usr/lib/jvm/java-11-openjdk

File path - /etc/ambari-server/conf/ambari.properties | grep -i java.home

Bash
    
 
java.home=/usr/lib/jvm/java-11-openjdkstack.java.home=/usr/lib/jvm/java-11-openjdk
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Upgrade the Ambari Server Database Schema

Bash
    
 
ambari-server upgrade -v
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Upon running the command, the response will be as shown in the screenshot.

Make sure to take the database backup as mentioned earlier and enter 'y' here.

Start the Ambari Server

Once started, you are able to access the Ambari UI using the same url as it was earlier.

Bash
    
 
ambari-server start
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Access the Ambari UI

Use your browser to access the Ambari UI.

Check the Upgraded Version

To verify the upgraded Ambari version, navigate to Admin → About in the top-right corner of the Ambari UI.

All the services also must be working normally without any downtime.

Install Mpacks and Restoring Configurations

Follow the steps on the Guide for Management Packs page for installing mpacks and restoring configurations.

Known Issues

Pip dependency missing

Error:

Bash
    
 
[root@ce19 ~]# ambari-server upgradeUsing python  /usr/bin/python3Upgrading ambari-serverTraceback (most recent call last):  File "/usr/sbin/ambari-server.py", line 28, in <module>    from ambari_commons.exceptions import FatalException, NonFatalException  File "/usr/lib/ambari-server/lib/ambari_commons/init.py", line 21, in <module>    from ambari_commons.os_check import OSCheck, OSConst  File "/usr/lib/ambari-server/lib/ambari_commons/os_check.py", line 25, in <module>    import distroModuleNotFoundError: No module named 'distro'
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Workaround:

Bash
    
 
pip3 install distro
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If still hitting the distro module not found error, follow the below steps:

Step 1:

Download the get-pip.py script:

Bash
    
 
curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
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Install pip for Python 3.11:

Bash
    
 
/usr/bin/python3.11 get-pip.py
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Step 2: Install the distro module using pip3.11

Once `pip` is installed for Python 3.11, you can now use it to install the missing `distro` module:

Bash
    
 
/usr/bin/python3.11 -m pip install distro
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Step 3: Verify the installation.

After installing the distro module, verify that it’s correctly installed:

Bash
    
 
/usr/bin/python3.11 -c "import distro"
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The ambari-server upgrade -v upgrade is successfully done.

Mpacks uninstallation not done

Bash
    
 
Traceback (most recent call last):  File "/usr/lib/ambari-server/lib/ambari_simplejson/scanner.py", line 49, in _scan_once    nextchar = string[idx]IndexError: string index out of range​During handling of the above exception, another exception occurred:​Traceback (most recent call last):  File "/usr/sbin/ambari-server.py", line 1083, in <module>    mainBody()  File "/usr/sbin/ambari-server.py", line 1053, in mainBody    main(options, args, parser)  File "/usr/sbin/ambari-server.py", line 999, in main    action_obj.execute()  File "/usr/sbin/ambari-server.py", line 78, in execute    self.fn(*self.args, **self.kwargs)  File "/usr/lib/ambari-server/lib/ambari_server/serverUpgrade.py", line 262, in upgrade    retcode = run_schema_upgrade(args)  File "/usr/lib/ambari-server/lib/ambari_server/serverUpgrade.py", line 162, in run_schema_upgrade    upgrade_response = json.loads(stdout)  File "/usr/lib/ambari-server/lib/ambari_simplejson/init.py", line 538, in loads    return _default_decoder.decode(s)  File "/usr/lib/ambari-server/lib/ambari_simplejson/decoder.py", line 378, in decode    obj, end = self.raw_decode(s)  File "/usr/lib/ambari-server/lib/ambari_simplejson/decoder.py", line 408, in raw_decode    return self.scan_once(s, idx=_w(s, idx).end())  File "/usr/lib/ambari-server/lib/ambari_simplejson/scanner.py", line 93, in scan_once    return _scan_once(string, idx)  File "/usr/lib/ambari-server/lib/ambari_simplejson/scanner.py", line 51, in _scan_once    raise JSONDecodeError(errmsg, string, idx)ambari_simplejson.errors.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
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Workaround: Uninstall all the ambari-mpacks.

Bash
    
 
ambari-server uninstall-mpack --mpack-name=<installed mpack>
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