How can I detect if ambari-server setup has already been ran

Question

I am creating ansible scripts to bootstrap our ambari servers. I need to check if ambari-server setup has already been ran so that re-running the ansible scripts do not error out when it gets to that step. The easiest way to make these idempotent in ansible is to check for the existence of a file, but I haven't been able to find any obvious file created by the setup process that I can rely on.

jsensharma · Accepted Answer

@maxolasersquad

One very basic test we can do to verify if the "ambari-server setup" was performed or not is to look for JDBC settings.

For example when we simply install ambari server binary on a host then the ambari.properties file will not have any JDBC configs so the output for the following will be empty.

Example: (no output on a server where ambari-server setup was not executed)

# grep 'jdbc' /etc/ambari-server/conf/ambari.properties

However, on a server where setup was executed you will see atleast some jdbc settings as following:

# grep 'jdbc' /etc/ambari-server/conf/ambari.properties 
custom.mysql.jdbc.name=mysql-connector-java.jar
custom.oracle.jdbc.name=ojdbc8.jar
previous.custom.mysql.jdbc.name=mysql-jdbc-driver.jar
server.jdbc.connection-pool=internal
server.jdbc.database=postgres
server.jdbc.database_name=ambari
server.jdbc.postgres.schema=ambari
server.jdbc.user.name=ambari
server.jdbc.user.passwd=${alias=ambari.db.password}

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