Support Questions
Find answers, ask questions, and share your expertise
Announcements
Alert: Welcome to the Unified Cloudera Community. Former HCC members be sure to read and learn how to activate your account here.

Is there any way to restore ambari for existing cluster after database crashes?

Highlighted

Is there any way to restore ambari for existing cluster after database crashes?

New Contributor

I had setup the ambari db on postgres.

Also i was using ranger and ranger KMS for advanced authorization and Encryption.

Few days back, my database crashed leaving it totally inaccessible.

Now, i want to know if there is any way to deploy a new ambari server for existing cluster.

The Ranger services however if don't work can be restored later.

I was using ambari 2.2.0 with HDP stack 2.4.3.

1 REPLY 1

Re: Is there any way to restore ambari for existing cluster after database crashes?

Super Mentor

@Sumit Sharma

In order to restore services like Ambari which is dependent on the Ambari Database Data, you will need to have ambari DB dump collected in advance.


Support if you have any recently collected ambari DB dump then you can try the following approach to recover your ambari configs and cluster details.


Importing the DB dump to the DB

# su postgres -c 'psql -f /PATH/TO/latest_ambari_db_dump.sql  -d ambari'


Assuming that your ambari "ambari.properties" file will already be pointing to the same Postgres DB host so you can simply start the ambari server after importing the DB dump insie the ambari DB.

# ambari-server start

If you have imported the ambari Postgres DB dump to a remote (non embedded postgres) then in that case you will have to run ambari-server setup and then choose option [4] PostgreSQL option and then provide the DB host / user/ schema ...etc

details to point ambari to use that DB.

# ambari-server setup
Using python  /usr/bin/python
Setup ambari-server
Checking SELinux...
SELinux status is 'enabled'
SELinux mode is 'permissive'
WARNING: SELinux is set to 'permissive' mode and temporarily disabled.
OK to continue [y/n] (y)? y
Customize user account for ambari-server daemon [y/n] (n)? n
Adjusting ambari-server permissions and ownership...
Checking firewall status...
Checking JDK...
Do you want to change Oracle JDK [y/n] (n)? n
Completing setup...
Configuring database...
Enter advanced database configuration [y/n] (n)? y
Configuring database...
==============================================================================
Choose one of the following options:
[1] - PostgreSQL (Embedded)
[2] - Oracle
[3] - MySQL / MariaDB
[4] - PostgreSQL
[5] - Microsoft SQL Server (Tech Preview)
[6] - SQL Anywhere
[7] - BDB
==============================================================================
Enter choice (4): 4
Hostname : yourambariDB.example.com
Port (5432): 5432
Database name (ambari): ambari 
Postgres schema (ambari): ambari
Username (ambari): ambari
Enter Database Password (bigdata): bigdata
Configuring ambari database...
Configuring remote database connection properties...
WARNING: Before starting Ambari Server, you must run the following DDL against the database to create the schema: /var/lib/ambari-server/resources/Ambari-DDL-Postgres-CREATE.sql
Proceed with configuring remote database connection properties [y/n] (y)? n
WARNING: Remote database setup aborted.
Ambari Server 'setup' completed with warnings.

.

Don't have an account?
Coming from Hortonworks? Activate your account here