Kubernetes Python Client¶
Python client for the kubernetes API.
git clone --recursive https://github.com/kubernetes-client/python.git cd python python setup.py install
From PyPI directly:
pip install kubernetes
list all pods:
from kubernetes import client, config # Configs can be set in Configuration class directly or using helper utility config.load_kube_config() v1 = client.CoreV1Api() print("Listing pods with their IPs:") ret = v1.list_pod_for_all_namespaces(watch=False) for i in ret.items: print("%s\t%s\t%s" % (i.status.pod_ip, i.metadata.namespace, i.metadata.name))
watch on namespace object:
from kubernetes import client, config, watch # Configs can be set in Configuration class directly or using helper utility config.load_kube_config() v1 = client.CoreV1Api() count = 10 w = watch.Watch() for event in w.stream(v1.list_namespace, _request_timeout=60): print("Event: %s %s" % (event['type'], event['object'].metadata.name)) count -= 1 if not count: w.stop() print("Ended.")
More examples can be found in examples folder. To run examples, run this command:
python -m examples.example1
(replace example1 with one of the filenames in the examples folder)
All APIs and Models’ documentation can be found at the Generated client’s README file
client-python follows semver, so until the major version of
client-python gets increased, your code will continue to work with explicitly
supported versions of Kubernetes clusters.
Compatibility matrix of supported client versions¶
- client 9.y.z: Kubernetes 1.12 or below (+-), Kubernetes 1.13 (✓), Kubernetes 1.14 or above (+-)
- client 10.y.z: Kubernetes 1.13 or below (+-), Kubernetes 1.14 (✓), Kubernetes 1.14 or above (+-)
- client 11.y.z: Kubernetes 1.14 or below (+-), Kubernetes 1.15 (✓), Kubernetes 1.16 or above (+-)
- client 12.y.z: Kubernetes 1.15 or below (+-), Kubernetes 1.16 (✓), Kubernetes 1.17 or above (+-)
- client 17.y.z: Kubernetes 1.16 or below (+-), Kubernetes 1.17 (✓), Kubernetes 1.18 or above (+-)
- client 18.y.z: Kubernetes 1.17 or below (+-), Kubernetes 1.18 (✓), Kubernetes 1.19 or above (+-)
See here for an explaination of why there is no v13-v16 release.
✓Exactly the same features / API objects in both client-python and the Kubernetes version.
+client-python has features or API objects that may not be present in the Kubernetes cluster, either due to that client-python has additional new API, or that the server has removed old API. However, everything they have in common (i.e., most APIs) will work. Please note that alpha APIs may vanish or change significantly in a single release.
-The Kubernetes cluster has features the client-python library can’t use, either due to the server has additional new API, or that client-python has removed old API. However, everything they share in common (i.e., most APIs) will work.
See the CHANGELOG for a detailed description of changes between client-python versions.
|Client version||Canonical source for OpenAPI spec||Maintenance status|
|5.0 Alpha/Beta||Kubernetes main repo, 1.9 branch||✗|
|5.0||Kubernetes main repo, 1.9 branch||✗|
|6.0 Alpha/Beta||Kubernetes main repo, 1.10 branch||✗|
|6.0||Kubernetes main repo, 1.10 branch||✗|
|7.0 Alpha/Beta||Kubernetes main repo, 1.11 branch||✗|
|7.0||Kubernetes main repo, 1.11 branch||✗|
|8.0 Alpha/Beta||Kubernetes main repo, 1.12 branch||✗|
|8.0||Kubernetes main repo, 1.12 branch||✗|
|9.0 Alpha/Beta||Kubernetes main repo, 1.13 branch||✗|
|9.0||Kubernetes main repo, 1.13 branch||✗|
|10.0 Alpha/Beta||Kubernetes main repo, 1.14 branch||✗|
|10.0||Kubernetes main repo, 1.14 branch||✗|
|11.0 Alpha/Beta||Kubernetes main repo, 1.15 branch||✗|
|11.0||Kubernetes main repo, 1.15 branch||✗|
|12.0 Alpha/Beta||Kubernetes main repo, 1.16 branch||✗|
|12.0||Kubernetes main repo, 1.16 branch||✓|
|17.0 Alpha/Beta||Kubernetes main repo, 1.17 branch||✗|
|17.0||Kubernetes main repo, 1.17 branch||✓|
|18.0 Alpha/Beta||Kubernetes main repo, 1.18 branch||✗|
|18.0||Kubernetes main repo, 1.18 branch||✓|
See here for an explaination of why there is no v13-v16 release.
✓Changes in main Kubernetes repo are manually (should be automated) published to client-python when they are available.
✗No longer maintained; please upgrade.
Kubernetes supports three minor releases at a time. “Support” means we expect users to be running that version in production, though we may not port fixes back before the latest minor version. For example, when v1.3 comes out, v1.0 will no longer be supported. In consistent with Kubernetes support policy, we expect to support three GA major releases (corresponding to three Kubernetes minor releases) at a time.
Note: There would be no maintenance for alpha/beta releases except the latest one.
Exception to the above support rule: Since we are running behind on releases, we will support Alpha/Beta releases for a greater number of clients until we catch up with the upstream version.
Homogenizing the Kubernetes Python Client versions¶
The client releases v12 and before following a versioning schema where the major version was 4 integer positions behind the Kubernetes minor on which the client is based on. For example, v12.0.0 is based on Kubernetes v1.16, v11.0.0 is based on Kubernetes v1.15 and so on.
This created a lot of confusion tracking two different version numbers for each client release. It was decided to homogenize the version scheme starting from the Kubernetes Python client based on Kubernetes v1.17. The versioning scheme of the client from this release would be vY.Z.P where Y and Z are the Kubernetes minor and patch release numbers from Kubernets v1.Y.Z and P is the client specific patch release numbers to accomodate changes and fixes done specifically to the client. For more details, refer this issue.
Community, Support, Discussion¶
If you have any problem on using the package or any suggestions, please start with reaching the Kubernetes clients slack channel, or filing an issue to let us know. You can also reach the maintainers of this project at SIG API Machinery, where this project falls under.
SSLError on macOS¶
If you get an SSLError, you likely need to update your version of python. The version that ships with macOS may not be supported.
Install the latest version of python with brew:
brew install python
Once installed, you can query the version of OpenSSL like so:
python -c "import ssl; print ssl.OPENSSL_VERSION"
You’ll need a version with OpenSSL version 1.0.0 or later.
Hostname doesn’t match¶
If you get an
ssl.CertificateError complaining about hostname match, your installed packages does not meet version requirements.
urllib3 package versions to make sure they met requirements in requirements.txt file.
Why Exec/Attach calls doesn’t work¶
Starting from 4.0 release, we do not support directly calling exec or attach calls. you should use stream module to call them. so instead
resp = api.connect_get_namespaced_pod_exec(name, ... you should call
resp = stream(api.connect_get_namespaced_pod_exec, name, ....
Using Stream will overwrite the requests protocol in core_v1_api.CoreV1Api() This will cause a failure in non-exec/attach calls. If you reuse your api client object, you will need to recreate it between api calls that use stream and other api calls.
See more at exec example.