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Merge pull request #2855 from hashicorp/jbs-1628 

docs: add user resource limits FAQ, fixes #1628
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James Phillips 2017-03-30 11:04:27 -07:00 committed by GitHub
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@ -82,3 +82,22 @@ as well as race conditions between data updates and watch registrations.
## Q: What network ports does Consul use?
The [Ports Used](https://www.consul.io/docs/agent/options.html#ports) section of the Configuration documentation lists all ports that Consul uses.
## Q: Does Consul require certain user process resource limits?
There should be only a small number of open file descriptors required for a
Consul client agent. The gossip layers perform transient connections with
other nodes, each connection to the client agent (such as for a blocking
query) will open a connection, and there will typically be connections to one
of the Consul servers. A small number of file descriptors are also required
for watch handlers, health checks, log files, and so on.
For a Consul server agent, you should plan on the above requirements and
an additional incoming connection from each of the nodes in the cluster. This
should not be the common case, but in the worst case if there is a problem
with the other servers you would expect the other client agents to all
connect to a single server and so preparation for this possibility is helpful.
The default ulimits are usually sufficient for Consul, but you should closely
scrutinize your own environment's specific needs and identify the root cause
of any excessive resource utilization before arbitrarily increasing the limits.