Changing the name or IP address of the master host Perform this procedure after updating the master host operating system with a new hostname or IP address. Log in to the Control Center web interface. In the Actions column of the Applications table, click Stop for each application running on the master host. In the Stop Services dialog, click Stop Services. Log in to the Control Center master host as root or as a user with sudo privileges. Optional: Update variables in /etc/default/serviced, if necessary. For example, some deployments use the master host IP address for the values of the SERVICED_OUTBOUND_IP or SERVICED_STATIC_IPS variables. Stop Control Center. Ubuntu: sudo stop serviced RHEL/CentOS: systemctl stop serviced Remove the zookeeper file. Ubuntu: sudo rm -rf /opt/serviced/var/isvcs/zookeeper RHEL/CentOS: rm -rf /opt/serviced/var/isvcs/zookeeper Start Control Center. Ubuntu: sudo start serviced RHEL/CentOS: systemctl start serviced Update resource pool hosts with the new master host name or IP address. Each resource pool host includes the master host name or IP address in its /etc/default/serviced file, which must be changed. Perform the following substeps on each resource pool host: Log in to the resource pool host as root or as a user with sudo privileges. Open /etc/default/serviced with a text editor, and then change the name or IP address of the master host. The following variables need to be updated with the new information: SERVICED_ZK SERVICED_DOCKER_REGISTRY SERVICED_ENDPOINT SERVICED_LOG_ADDRESS SERVICED_LOGSTASH_ES SERVICED_STATS_PORT Save the file, and then exit the text editor. Stop and restart Control Center. Ubuntu: sudo stop serviced && sudo start serviced RHEL/CentOS: systemctl stop serviced & systemctl start serviced Return to the Control Center web interface. On the Hosts page, locate the master host with the old system information and click Delete. In the Remove Host dialog, click Remove Host. The master host with the old information is removed from the Hosts table. Click Add Host. In the Add Host dialog, specify the new Host and port, the Resource Pool ID, and RAM Committment, and then click Add Host. The master host is added to the Hosts table with the new system information. On the Applications page, click Start to restart all applications.