Doorkeeper for consul discovered services.
ianitor is a doorkeeper for your services discovered using consul. It can automatically register new services through consul API and manage TTL health checks.
Consul/Python versions compatibility
ianitor is compatibile with Python 2.7, 3.3, 3.4, and 3.5 versions. It is also tested against each latest patch version of every major/minor consul release starting from 0.4.1 version.
For details of our test matrix see travis.yml file.
Installation and usage
Simply install with pip:
$ pip install ianitor
And you’re ready to go with:
$ ianitor appname -- ./yourapp --some-switch
You can check if service is registered diggin’ into consul DNS service:
$ dig @localhost -p 8600 appname.service.consul ; <<>> DiG 9.9.3-P1 <<>> @localhost -p 8600 appname.service.consul ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 25966 ;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; WARNING: recursion requested but not available ;; QUESTION SECTION: ;appname.service.consul. IN A ;; ANSWER SECTION: appname.service.consul. 0 IN A 10.54.54.214 ;; Query time: 44 msec ;; SERVER: 127.0.0.1#8600(127.0.0.1) ;; WHEN: Tue Oct 28 13:53:09 CET 2014 ;; MSG SIZE rcvd: 78
usage: ianitor [-h] [--consul-agent hostname[:port]] [--ttl seconds] [--heartbeat seconds] [--tags tag] [--id ID] [--port PORT] [-v] service-name -- command [arguments] Doorkeeper for consul discovered services. positional arguments: service-name service name in consul cluster optional arguments: -h, --help show this help message and exit --consul-agent=hostname[:port] set consul agent address --ttl=seconds set TTL of service in consul cluster --heartbeat=seconds set process poll heartbeat (defaults to ttl/10) --tags=tag set service tags in consul cluster (can be used multiple times) --id=ID set service id - must be node unique (defaults to service name) --port=PORT set service port -v, --verbose enable logging to stdout (use multiple times to increase verbosity)
How does ianitor work?
ianitor spawns process using python’s subprocess.Popen() with command line specified after -- . It redirects its own stdin to child’s stdin and childs stdout/stderr to his own stdout/stderr.
This way ianitor does not interfere with logging of managed service if it logs to stdout. Moreover ianitor does not log anything to make it easier to plug it in your existing process supervision tool.
ianitor handles service registration in consul agent as well as keeping registered service entry in consul in “healthy” state by continously requesting it’s TTL health check endpoint.
Example supervisord config
Assuming that you have some service under supervisord supervision:
[program:rabbitmq] command=/usr/sbin/rabbitmq-server priority=0 autostart=true
Simply wrap it with ianitor call:
[program:rabbitmq] command=/usr/local/bin/ianitor rabbitmq -- /usr/sbin/rabbitmq-server priority=0 autostart=true
ianitor is licensed under LGPL license, version 3.
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