Apache Ambari User Guide
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Prepare the Ambari Server Host for Rollback

Log into the Ambari server host and set the following environment variables to prepare for the rollback procedure:

Variable

Value

export AMBARI_USER=AMBARI_USERNAME

Substitute the value of the administrative user for Ambari Web. The default value is admin.

export AMBARI_PW=AMBARI_PASSWORD

Substitute the value of the administrative password for Ambari Web. The default value is admin.

export AMBARI_PORT=AMBARI_PORT

Substitute the Ambari Web port. The default value is 8080.

export AMBARI_PROTO=AMBARI_PROTOCOL

Substitute the value of the protocol for connecting to Ambari Web. Options are http or https. The default value is http.

export CLUSTER_NAME=CLUSTER_NAME

Substitute the name of your cluster, set during the Ambari Install Wizard process. For example: mycluster.

export NAMENODE_HOSTNAME=NN_HOSTNAME

Substitute the FQDN of the host for the non-HA NameNode. For example: nn01.mycompany.com.

export ADDITIONAL_NAMENODE_HOSTNAME=ANN_HOSTNAME

Substitute the FQDN of the host for the additional NameNode in your HA setup.

export SECONDARY_NAMENODE_HOSTNAME=SNN_HOSTNAME

Substitute the FQDN of the host for the secondary NameNode for the non-HA setup.

export JOURNALNODE1_HOSTNAME=JOUR1_HOSTNAME

Substitute the FQDN of the host for the first Journal Node.

export JOURNALNODE2_HOSTNAME=JOUR2_HOSTNAME

Substitute the FQDN of the host for the second Journal Node.

export JOURNALNODE3_HOSTNAME=JOUR3_HOSTNAME

Substitute the FQDN of the host for the third Journal Node.

Double check that these environment variables are set correctly.