# Cluster Management
HStreamDB supports horizontal scaling for both HServer and HStore. This piece of documentation will focus on how to configure an HServer Cluster
# HServer Cluster: seed-nodes
# Bootstrap with hstream init
The default value of seed-nodes is "localhost" ("localhost:6571"). If the port is not given to the URL, it will use the port value specified in internal-port option. If you want to bootstrap an HServer cluster, please provide the address of all the initial nodes in the configuration file of every seed, such as "192.168.1.1,192.168.1.2,192.168.1.3". Or pass the seed nodes through the command line option --seed-nodes.
hstream-server --config-path ... --seed-nodes "192.168.1.1,192.168.1.2,192.168.1.3" --server-id 100
hstream-server --config-path ... --seed-nodes "192.168.1.1,192.168.1.2,192.168.1.3" --server-id 101
hstream-server --config-path ... --seed-nodes "192.168.1.1,192.168.1.2,192.168.1.3" --server-id 102
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After starting all the seed nodes, it is required to send an init signal to one of the nodes in the cluster to notify that the cluster is ready to serve. The init signal can be sent with "hstream init" command.
hstream --host 192.168.1.1 init
# New Node Join with seed-nodes Configuration
If you want to add a new node to the cluster, you can simply start the new node with the seed-nodes configuration which contains one or more existing nodes in the cluster. The new node will automatically join the cluster. Or pass the seed nodes through the command line option --seed-nodes.
hstream-server --config-path ... --seed-nodes "192.168.1.1" --server-id 103