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Add notebook on how to create a ConfigMap and use its data in Pods #304

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Merged
merged 2 commits into from
Sep 19, 2017
Merged

Add notebook on how to create a ConfigMap and use its data in Pods #304

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Add notebook on how to create a ConfigMap and use its data in Pods
djkonro Jul 23, 2017
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Merge branch 'master' into create_configmap
mbohlool Sep 19, 2017
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314 changes: 314 additions & 0 deletions examples/notebooks/create_configmap.ipynb
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{
"cells": [
{
"cell_type": "markdown",
"metadata": {
"deletable": true,
"editable": true
},
"source": [
"How to create a ConfigMap and use its data in Pods\n",
"===========================\n",
"\n",
"[ConfigMaps](https://kubernetes.io/docs/tasks/configure-pod-container/configmap/) allow you to decouple configuration artifacts from image content to keep containerized applications portable. In this notebook we would learn how to create a ConfigMap and also how to use its data in Pods as seen in https://kubernetes.io/docs/tasks/configure-pod-container/configure-pod-configmap/"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": false,
"deletable": true,
"editable": true
},
"outputs": [],
"source": [
"from kubernetes import client, config\n",
"from kubernetes.client.rest import ApiException"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### Load config from default location"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true,
"deletable": true,
"editable": true
},
"outputs": [],
"source": [
"config.load_kube_config()"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### Create API endpoint instance and API resource instances"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true,
"deletable": true,
"editable": true
},
"outputs": [],
"source": [
"api_instance = client.CoreV1Api()\n",
"cmap = client.V1ConfigMap()"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### Create key value pair data for the ConfigMap"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true,
"deletable": true,
"editable": true
},
"outputs": [],
"source": [
"cmap.metadata = client.V1ObjectMeta(name=\"special-config\")\n",
"cmap.data = {}\n",
"cmap.data[\"special.how\"] = \"very\"\n",
"cmap.data[\"special.type\"] = \"charm\""
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### Create ConfigMap"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": false,
"deletable": true,
"editable": true
},
"outputs": [],
"source": [
"api_instance.create_namespaced_config_map(namespace=\"default\", body=cmap)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### Create API endpoint instance and API resource instances for test Pod"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true,
"deletable": true,
"editable": true
},
"outputs": [],
"source": [
"pod = client.V1Pod()\n",
"spec = client.V1PodSpec()\n",
"pod.metadata = client.V1ObjectMeta(name=\"dapi-test-pod\")"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### Initialize test Pod container"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true,
"deletable": true,
"editable": true
},
"outputs": [],
"source": [
"container = client.V1Container()\n",
"container.name = \"test-container\"\n",
"container.image = \"gcr.io/google_containers/busybox\"\n",
"container.command = [\"/bin/sh\", \"-c\", \"env\"]"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### Define Pod environment variables with data from ConfigMaps"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true,
"deletable": true,
"editable": true
},
"outputs": [],
"source": [
"container.env = [client.V1EnvVar(name=\"SPECIAL_LEVEL_KEY\"), client.V1EnvVar(name=\"SPECIAL_TYPE_KEY\")]\n",
"container.env[0].value_from = client.V1EnvVarSource()\n",
"container.env[0].value_from.config_map_key_ref = client.V1ConfigMapKeySelector(name=\"special-config\", key=\"special.how\")\n",
"\n",
"container.env[1].value_from = client.V1EnvVarSource()\n",
"container.env[1].value_from.config_map_key_ref = client.V1ConfigMapKeySelector(name=\"special-config\", key=\"special.type\")\n",
"\n",
"spec.restart_policy = \"Never\"\n",
"spec.containers = [container]\n",
"pod.spec = spec"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### Create Pod"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": false,
"deletable": true,
"editable": true
},
"outputs": [],
"source": [
"api_instance.create_namespaced_pod(namespace=\"default\",body=pod)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### View ConfigMap data from Pod log"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": false,
"deletable": true,
"editable": true,
"scrolled": true
},
"outputs": [],
"source": [
"log = \"\"\n",
"try: \n",
" log = api_instance.read_namespaced_pod_log(name=\"dapi-test-pod\", namespace=\"default\")\n",
"except ApiException as e:\n",
" if str(e).find(\"ContainerCreating\") != -1:\n",
" print(\"Creating Pod container.\\nRe-run current cell.\")\n",
" else:\n",
" print(\"Exception when calling CoreV1Api->read_namespaced_pod_log: %s\\n\" % e)\n",
"\n",
"for line in log.split(\"\\n\"):\n",
" if line.startswith(\"SPECIAL\"):\n",
" print(line)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### Delete ConfigMap"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": false,
"deletable": true,
"editable": true
},
"outputs": [],
"source": [
"api_instance.delete_namespaced_config_map(name=\"special-config\", namespace=\"default\", body=cmap)"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"### Delete Pod"
]
},
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": false,
"deletable": true,
"editable": true,
"scrolled": true
},
"outputs": [],
"source": [
"api_instance.delete_namespaced_pod(name=\"dapi-test-pod\", namespace=\"default\", body=client.V1DeleteOptions())"
]
},
{
"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
}