Start Hyper-Converged Database (HCD) as a service

Hyper-Converged Database (HCD) runs a service when installed from RHEL or Debian packages.

All nodes in the cluster must have the same version of HCD installed from a package. Nodes might not be able to join the ring if they are running different versions of HCD or other Cassandra-based database distributions.

If you are restarting a node, stop HCD before starting it again.
Start HCD:
```
sudo service hcd start
```
If the following error appears, see HCD cannot start with YAML parsing error.
```
WARNING: Timed out while waiting for HCD to start.
```
If you need to start HCD on multiple nodes, repeat the previous steps on each node.
Verify that the cluster is running:
```
nodetool status
```
Make sure all nodes report UN (Up/Normal).

Start Hyper-Converged Database (HCD) as a service

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