You should have installed and configured Eucalyptus before starting the Walrus Backend.
If you not using Walrus as your object storage backend, or if you installed Walrus on the same host as the CLC, you can skip this.
To start the Walrus
If you want the Walrus Backend service to start at each boot-time, run this command:
systemctl enable eucalyptus-cloud.service
Log in to the Walrus Backend host machine and enter the following command:
systemctl start eucalyptus-cloud.service