Consulate: A Consul Client Library
Consulate is a Python client library and set of application for the Consul service discovery and configuration system.
Installation
Consulate is available via via pypi and can be installed with easy_install or pip:
pip install consulateIf you require communicating with Consul via a Unix socket, there is an extra dependency that is installed via:
pip install consulate[unixsocket]Command Line Utilities
Consulate comes with two command line utilities that make working with Consul
easier from a management perspective. The consulate application provides
a cli wrapper for common tasks performed.
consulate
The consulate application provides a CLI interface for registering a service, backing up and restoring the contents of the KV database, and actions for getting, setting, and deleting keys from the KV database.
usage: consulate [-h] [--api-scheme API_SCHEME] [--api-host API_HOST]
[--api-port API_PORT] [--datacenter DC] [--token TOKEN]
{register,deregister,kv,run_once} ...
CLI utilities for Consul
optional arguments:
-h, --help show this help message and exit
--api-scheme API_SCHEME
The scheme to use for connecting to Consul with
--api-host API_HOST The consul host to connect on
--api-port API_PORT The consul API port to connect to
--datacenter DC The datacenter to specify for the connection
--token TOKEN ACL token
Commands:
{register,deregister,kv,run_once,services}
register Register a service for this node
deregister Deregister a service for this node
kv Key/Value Database Utilities
run_once Lock command
services List services for this node
If the CONSUL_RPC_ADDR environment variable is set, it will be parsed and used
for default values when connecting.Service Registration Help:
usage: consulate register [-h] [-a ADDRESS] [-p PORT] [-s SERVICE_ID]
[-t TAGS]
name {check,httpcheck,no-check,ttl} ...
positional arguments:
name The service name
optional arguments:
-h, --help show this help message and exit
-a ADDRESS, --address ADDRESS
Specify an address
-p PORT, --port PORT Specify a port
-s SERVICE_ID, --service-id SERVICE_ID
Specify a service ID
-t TAGS, --tags TAGS Specify a comma delimited list of tags
Service Check Options:
{check,httpcheck,no-check,ttl}
check Define an external script-based check
httpcheck Define an HTTP-based check
no-check Do not enable service monitoring
ttl Define a duration based TTL checkKV Database Utilities Help:
usage: consulate kv [-h] {backup,restore,ls,mkdir,get,set,rm} ...
optional arguments:
-h, --help show this help message and exit
Key/Value Database Utilities:
{backup,restore,ls,mkdir,get,set,rm}
backup Backup to stdout or a JSON file
restore Restore from stdin or a JSON file
ls List all of the keys
mkdir Create a folder
get Get a key from the database
set Set a key in the database
rm Remove a key from the databaseLocking Operations Help:
usage: consulate [-h] run_once [-i INTERVAL] prefix command
positional arguments:
prefix the name of the lock which will be held in Consul.
command the command to run
optional arguments:
-h, --help show this help message and exit
-i, --interval hold the lock for INTERVAL secondsService listing Help:
usage: consulate services [-h] [-i INDENT]
optional arguments:
-h, --help show this help message and exit
-i INDENT, --indent INDENT
The indent level for outputAPI Usage Examples
The following examples highlight the usage of Consulate and does not document the scope of the full Consulate API.
Using Consulate with the Consul kv database:
consul = consulate.Consul()
# Set the key named release_flag to True
consul.kv['release_flag'] = True
# Get the value for the release_flag, if not set, raises AttributeError
try:
should_release_feature = consul.kv['release_flag']
except AttributeError:
should_release_feature = False
# Delete the release_flag key
del consul.kv['release_flag']
# Find all keys that start with "fl"
consul.kv.find('fl')
# Find all keys that start with "feature_flag" terminated by "/" separator
consul.kv.find('feature_flag', separator='/')
# Check to see if a key called "foo" is set
if "foo" in consul.kv:
print 'Already Set'
# Return all of the items in the key/value store
consul.kv.items()Working with the Consulate.agent API:
consul = consulate.Consul()
# Get all of the service checks for the local agent
checks = consul.agent.checks()
# Get all of the services registered with the local agent
services = consul.agent.services()
# Add a service to the local agent
consul.agent.service.register('redis',
port=6379,
tags=['master'],
ttl='10s')Fetching health information from Consul:
consul = consulate.Consul()
# Get the health of a individual node
health = consul.health.node('my-node')
# Get all checks that are critical
checks = consul.health.state('critical')For more examples, check out the Consulate documentation.