A simple yet powerful CloudStack API client for Python and the command-line.
Project description
A simple, yet powerful CloudStack API client for python and the command-line.
Python 2.7+ and 3.4+ support.
Async support for Python 3.5+.
All present and future CloudStack API calls and parameters are supported.
Syntax highlight in the command-line client if Pygments is installed.
BSD license.
Installation
pip install cs # with the colored output pip install cs[highlight] # with the async support (Python 3.5+) pip install cs[async] # with both pip install cs[async,highlight]
Usage
In Python:
from cs import CloudStack
cs = CloudStack(endpoint='https://api.exoscale.ch/compute',
key='cloudstack api key',
secret='cloudstack api secret')
vms = cs.listVirtualMachines()
cs.createSecurityGroup(name='web', description='HTTP traffic')From the command-line, this requires some configuration:
cat $HOME/.cloudstack.ini[cloudstack]
endpoint = https://api.exoscale.ch/compute
key = cloudstack api key
secret = cloudstack api secret
# Optional ca authority certificate
verify = /path/to/certs/exoscale_ca.crt
# Optional client PEM certificate
cert = /path/to/client_exoscale.pemThen:
$ cs listVirtualMachines{
"count": 1,
"virtualmachine": [
{
"account": "...",
...
}
]
}$ cs authorizeSecurityGroupIngress \
cidrlist="0.0.0.0/0" endport=443 startport=443 \
securitygroupname="blah blah" protocol=tcpThe command-line client polls when async results are returned. To disable polling, use the --async flag.
To find the list CloudStack API calls go to http://cloudstack.apache.org/api.html
Configuration
Configuration is read from several locations, in the following order:
The CLOUDSTACK_ENDPOINT, CLOUDSTACK_KEY, CLOUDSTACK_SECRET and CLOUDSTACK_METHOD environment variables,
A CLOUDSTACK_CONFIG environment variable pointing to an .ini file,
A CLOUDSTACK_VERIFY (optional) environment variable pointing to a CA authority cert file,
A CLOUDSTACK_CERT (optional) environment variable pointing to a client PEM cert file,
A cloudstack.ini file in the current working directory,
A .cloudstack.ini file in the home directory.
To use that configuration scheme from your Python code:
from cs import CloudStack, read_config
cs = CloudStack(**read_config())Note that read_config() can raise SystemExit if no configuration is found.
CLOUDSTACK_METHOD or the method entry in the configuration file can be used to change the HTTP verb used to make CloudStack requests. By default, requests are made with the GET method but CloudStack supports POST requests. POST can be useful to overcome some length limits in the CloudStack API.
CLOUDSTACK_TIMEOUT or the timeout entry in the configuration file can be used to change the HTTP timeout when making CloudStack requests (in seconds). The default value is 10.
CLOUDSTACK_RETRY or the retry entry in the configuration file (integer) can be used to retry list and queryAsync requests on failure. The default value is 0, meaning no retry.
CLOUDSTACK_JOB_TIMEOUT or the job_timeout` entry in the configuration file (float) can be used to set how long an async call is retried assuming fetch_result is set to true). The default value is None, it waits forever.
CLOUDSTACK_POLL_INTERVAL or the poll_interval entry in the configuration file (number of seconds, float) can be used to set how frequently polling an async job result is done. The default value is 2.
CLOUDSTACK_EXPIRATION or the expiration entry in the configuration file (integer) can be used to set how long a signature is valid. By default, it picks 10 minutes but may be deactivated using any negative value, e.g. -1.
Multiple credentials can be set in .cloudstack.ini. This allows selecting the credentials or endpoint to use with a command-line flag.
[cloudstack]
endpoint = https://some-host/api/compute
key = api key
secret = api secret
[exoscale]
endpoint = https://api.exoscale.ch/compute
key = api key
secret = api secretUsage:
$ cs listVirtualMachines --region=exoscale
Optionally CLOUDSTACK_REGION can be used to overwrite the default region cloudstack.
For the power users that don’t want to put any secrets on disk, CLOUDSTACK_OVERRIDES let you pick which key will be set from the environment even if present in the ini file.
Pagination
CloudStack paginates requests. cs is able to abstract away the pagination logic to allow fetching large result sets in one go. This is done with the fetch_list parameter:
$ cs listVirtualMachines fetch_list=true
Or in Python:
cs.listVirtualMachines(fetch_list=True)
Tracing HTTP requests
Once in a while, it could be useful to understand, see what HTTP calls are made under the hood. The trace flag (or CLOUDSTACK_TRACE) does just that:
$ cs --trace listVirtualMachines $ cs -t listZones
Async client
cs provides the AIOCloudStack class for async/await calls in Python 3.5+.
import asyncio
from cs import AIOCloudStack, read_config
cs = AIOCloudStack(**read_config())
async def main():
vms = await cs.listVirtualMachines(fetch_list=True)
print(vms)
asyncio.run(main())Async deployment of multiple VMs
import asyncio
from cs import AIOCloudStack, read_config
cs = AIOCloudStack(**read_config())
machine = {"zoneid": ..., "serviceofferingid": ..., "templateid": ...}
async def main():
tasks = asyncio.gather(*(cs.deployVirtualMachine(name=f"vm-{i}",
**machine,
fetch_result=True)
for i in range(5)))
results = await tasks
# Destroy all of them, but skip waiting on the job results
await asyncio.gather(*(cs.destroyVirtualMachine(id=result['virtualmachine']['id'])
for result in results))
asyncio.run(main())Links
CloudStack API: http://cloudstack.apache.org/api.html
Example of use: Get Started with the exoscale API client
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