Upgrade Ambari Server

Follow the steps below to upgrade the Ambari server.

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Stop Infra-solr Service

Stop the Infra-solr Service from Ambari-UI.

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Stop Ambari Server and Agents

Stop Ambari Server

ambari-server stop

Stop Agents

Stop Ambari-agent on every cluster node.

ambari-agent stop

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Back up Ambari Database

Take the Ambari-server backend database backup from the server host.

DB Backup Commands

mkdir /tmp/ambari-server_db_bckp
mysqldump --databases ambari > /tmp/ambari-server_db_bckp/ambari_mysql_bckp.sql
The upgraded version Ambari-2.7.8.6-3 supports only Python 3. Please ensure Python 3 is installed and configured on all cluster nodes before proceeding with the upgrade.

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Verify the Python Version

python -V
Response: Python 3.x.x.

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Add Ambari Repo on Cluster Nodes

Back up the Old Ambari Repository

mv /etc/yum.repos.d/ambari.repo /tmp/
Retrieve the latest Ambari repository details from Accessing Acceldata Repositories and add it to all cluster nodes.

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List the existing Ambari packages

On RHEL

rpm -qa | grep ambari
On Ubuntu

apt list ambari-*
Example Output (if the current Ambari version is 2.7.6.0-1):

ambari-infra-solr-2.7.6.0-1.noarch
ambari-agent-2.7.6.0-1.x86_64
ambari-server-2.7.6.0-1.x86_64
ambari-infra-solr-client-2.7.6.0-1.noarch

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Remove the Existing Ambari Packages

• On the Ambari Server node, remove the installed packages before upgrading:

On RHEL:

yum remove ambari-server
On Ubuntu:

apt remove ambari-server

• On the Ambari agents node, remove the installed packages before upgrading:

On RHEL:

yum remove ambari-agent
On Ubuntu:

apt remove ambari-agent

• On the Ambariinfra-solrnode, remove the installed packages before upgrading:

On RHEL:

rpm -e --nodeps ambari-infra-solr-client ambari-infra-solr -y
On Ubuntu:

dpkg --remove --force-depends ambari-infra-solr-client ambari-infra-solr -y

• Adjust the package names based on the installed versions on each node.
• You can verify installed packages before removal using:

On RHEL

rpm -qa | grep ambari
On Ubuntu

apt list ambari-*
Make sure the Amabri packages are not installed.

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Install Ambari packages

Install the latest Ambari-server only on ambari-server node.

Ambari Server Node

For RHEL:

yum clean all
yum install ambari-server -y
For Ubuntu:

apt clean
apt update
apt install ambari-server -y

Ambari Agent Node

For RHEL:

yum clean all
yum install ambari-agent -y
For Ubuntu:

apt clean
apt update
apt install ambari-agent -y

Infra-solr Nodes

For RHEL:

yum clean all
yum install ambari-infra-solr ambari-infra-solr-client -y
For Ubuntu:

apt clean
apt update
apt install ambari-infra-solr ambari-infra-solr-client-y

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Ambari Server Configuration Files Restore

Restore the configuration files backed up at step 4 (Backup Taken in step 4).

Restore ambari.propertoies File

cp conf_12_02_25_16_52.save/ambari.properties conf/
When prompted, enter 'y' to confirm.

cp: overwrite 'conf/ambari.properties'? y

Restore passwd.dat File

cp /etc/ambari-server/conf_12_02_25_16_52.save/password.dat /etc/ambari-server/conf/password.dat

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Java and JSVC upgrade

Set up Java 11 on all nodes

# Install Java 11 on ALL nodes
yum install -y java-11-openjdk java-11-openjdk-devel
# Configure Java 11 on ALL nodes
update-alternatives --config java
update-alternatives --config javac
Install JSVC

yum install bigtop-jsvc* -y

Ambari Server Schema Upgrade

Before upgrading, ensure a database backup has been taken (as mentioned in Step 6).

Update ambari.properies

# Update java homes with JDK 11
java.home=/usr/lib/jvm/java-11-openjdk
stack.java.home=/usr/lib/jvm/java-11-openjdk
Add new properties in ambari.properties

ambari-server upgrade -v
Response when prompted:

Ambari Server configured for MySQL. Confirm you have made a backup of the Ambari Server database [y/n] (n)? y
Enter 'y' to confirm.
After the successful completion, you must see the following message.

Ambari Server 'upgrade' completed successfully.

Start Ambari Server

ambari-server start

Start Ambari Agent

ambari-agent start
Once started, verify that the Ambari UI is accessible using the same URL as before.

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Verify Ambari Version

Verify the upgraded Ambari version in admin->about on the top right corner in Ambari UI.

The Ambari version is upgraded successfully.