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the firewall

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Feng 2016-04-02 15:59:02 +08:00
parent 9ed5d4fb86
commit 2d1b6775a8
1 changed files with 24 additions and 4 deletions
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docs/source/cluster.rst
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@ -236,12 +236,32 @@ If a persistent MQTT client connected to node1 first, then disconnected and conn
client-->| connection |<--|
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Notice: NetSplit
----------------
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The Firewall
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The emqttd cluster does not support deployment across IDC, and the cluster will not handle NetSplit automatically. If NetSplit occures, nodes have to be rebooted manually.
If there is a firewall between clustered nodes, the cluster requires to open 4369 port used by epmd daemon, and a port segment for nodes' communication.
Configure the port segment in etc/emqttd.config, for example::
[{kernel, [
...
{inet_dist_listen_min, 20000},
{inet_dist_listen_max, 21000}
]},
...
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Network Partitions
------------------
The emqttd 1.0 cluster requires reliable network to avoid network partitions. The cluster will not recover from a network partition automatically.
If a network partition occures, there will be critical logs in log/emqttd_error.log::
Mnesia inconsistent_database event: running_partitioned_network, emqttd@host
To recover from a network partition, you have to stop the nodes in a partition, clean the 'data/mneisa' of these nodes and reboot to join the cluster again.
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Consistent Hash and DHT