Prepare the Ambari Server Host for Rollback
To prepare for the rollback procedure:
Steps
Log in to the Ambari server host.
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.
Double check that these environment variables are set correctly.