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Add notebook on how to watch changes to an object #281

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Aug 28, 2017
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Add notebook on how to watch changes to an object #281

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129 changes: 129 additions & 0 deletions examples/notebooks/watch_notebook.ipynb
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{
"cells": [
{
"cell_type": "markdown",
"metadata": {
"deletable": true,
"editable": true
},
"source": [
"How to watch changes to an object\n",
"==================\n",
"\n",
"In this notebook, we learn how kubernetes API resource Watch endpoint is used to observe resource changes. It can be used to get information about changes to any kubernetes object."
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true,
"deletable": true,
"editable": true
},
"outputs": [],
"source": [
"from kubernetes import client, config, watch"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### Load config from default location."
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"config.load_kube_config()"
]
},
{
"cell_type": "markdown",
"metadata": {
"deletable": true,
"editable": true
},
"source": [
"### Create API instance"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true,
"deletable": true,
"editable": true
},
"outputs": [],
"source": [
"api_instance = client.CoreV1Api()"
]
},
{
"cell_type": "markdown",
"metadata": {
"deletable": true,
"editable": true
},
"source": [
"### Run a Watch on the Pods endpoint. \n",
"Watch would be executed and produce output about changes to any Pod. After running the cell below, You can test this by running the Pod notebook [create_pod.ipynb](create_pod.ipynb) and observing the additional output here. You can stop the cell from running by restarting the kernel."
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": false,
"deletable": true,
"editable": true
},
"outputs": [],
"source": [
"w = watch.Watch()\n",
"for event in w.stream(api_instance.list_pod_for_all_namespaces):\n",
" print(\"Event: %s %s %s\" % (event['type'],event['object'].kind, event['object'].metadata.name))"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true,
"deletable": true,
"editable": true
},
"outputs": [],
"source": []
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 2",
"language": "python",
"name": "python2"
},
"language_info": {
"codemirror_mode": {
"name": "ipython",
"version": 2
},
"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython2",
"version": "2.7.6"
}
},
"nbformat": 4,
"nbformat_minor": 2
}