ngx_zeromq is a transport module which allows nginx to use ZeroMQ
message-oriented transport layer when communicating with upstream servers.
It's level 7 protocol agnostic, which means that it can be used with any
well-behaving upstream modules (proxy, fastcgi, uwsgi, scgi, etc.).
This is experimental module.
At this time, ngx_zeromq support only REQ/REP ZeroMQ sockets, which means
that upstream response must be delivered in a single ZeroMQ message (although
it can be multipart message).
Each message part must fit into upstream buffer (as defined by
proxy_buffer_size, proxy_buffers and other directives).
ZeroMQ is hungry for file descriptors, it will crash and bring worker process
down with it once it runs out of them. In order to guarantee that it doesn't
happen, worker connections limit (see: worker_connections) should be set
few times lower than the file descriptors limit (see: worker_rlimit_nofile).
SSL is another transport module, which means that it cannot be combined with
ngx_zeromq on the same connection (but this matters only for communication
with upstream servers, clients can still use SSL when connecting to nginx).
- syntax:
zeromq_threads <number> - default:
1 - context:
main
Configure number of ZeroMQ I/O threads to be used by each worker process.
- syntax:
zeromq_local <socket_type> <local_endpoint> - default:
none - context:
upstream
Configure local ZeroMQ endpoint (must use random port numbers).
- syntax:
zeromq_remote <socket_type> <remote_endpoint> - default:
none - context:
upstream
Configure remote ZeroMQ endpoint (cannot use random port numbers).
- syntax:
zeromq_single on|off - default:
off - context:
upstream
Enable single mode which allows use of predefined port numbers for local
endpoints. It comes at a price (only one worker can bind to such endpoint
and it will stop working after nginx reload) and it's supposed to be used
only during testing and development. Do not use this mode in production.
Use HTTP over ZeroMQ (using standard proxy module).
http {
upstream blackhole {
zeromq_remote REQ tcp://127.0.0.1:5555;
}
server {
location / {
proxy_pass http://blackhole;
}
}
}
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Copyright (c) 2012-2014, Piotr Sikora <piotr.sikora@frickle.com>
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