[erlang-questions] Forming a cluster
Wed Oct 24 15:48:09 CEST 2007
What is the recommended procedure for setting up a cluster of nodes,
each running an Erlang VM (all with the same .erlang.cookie)? The
nodes are all in the same subnet, behind a firewall. The node
population is reasonably static, but nodes there may be occasional
additions. When a node joins, the nodes already in the cluster need
to know about it. Each node has to know about every other node, (e.g.
by calling nodes()).
net_kernel:monitor_nodes will indicate when a node joins, but only if
the new node sends a message to some node in the cluster. How does
the new node know who is present? There seems to be a bootstrapping
problem. Also, requiring a new node to know about a cluster member is
problematic since the selected node might be down.
net_adm and the .erlang.hosts file is a possible solution, but that
seems static. It doesn't seem to accomodate nodes joining after the
initial cluster forms.
Is there a dynamic solution that doesn't require the new node to know
anything about the existing cluster members?
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