Apache Ambari Operations
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Prepare the Ambari Server Host for Rollback

To prepare for the rollback procedure:

Steps

  1. Log in to the Ambari server host.

  2. Set the following environment variables

    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, which you set during installation: 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.

  3. Double check that these environment variables are set correctly.