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Add notebook on how to create a ConfigMap and use its data in Pods
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‎examples/notebooks/create_configmap.ipynb

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{
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"How to create a ConfigMap and use its data in Pods\n",
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"===========================\n",
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"\n",
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"[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/"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": false,
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"deletable": true,
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"editable": true
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},
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"outputs": [],
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"source": [
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"from kubernetes import client, config, watch\n",
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"from kubernetes.client.rest import ApiException"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": true
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},
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"outputs": [],
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"source": [
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"config.load_kube_config()"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": true
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},
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"outputs": [],
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"source": [
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"api_instance = client.CoreV1Api()\n",
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"cmap = client.V1ConfigMap()"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": true
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},
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"outputs": [],
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"source": [
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"cmap.metadata = client.V1ObjectMeta(name=\"special-config\")\n",
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"cmap.data = {}\n",
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"cmap.data[\"special.how\"] = \"very\"\n",
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"cmap.data[\"special.type\"] = \"charm\""
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"api_instance.create_namespaced_config_map(namespace=\"default\", body=cmap)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": true
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},
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"outputs": [],
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"source": [
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"pod = client.V1Pod()\n",
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"spec = client.V1PodSpec()\n",
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"pod.metadata = client.V1ObjectMeta(name=\"dapi-test-pod\")"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": true
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},
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"outputs": [],
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"source": [
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"container = client.V1Container()\n",
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"container.name = \"test-container\"\n",
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"container.image = \"gcr.io/google_containers/busybox\"\n",
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"container.command = [\"/bin/sh\", \"-c\", \"env\"]"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": true
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},
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"outputs": [],
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"source": [
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"container.env = [client.V1EnvVar(name=\"SPECIAL_LEVEL_KEY\"), client.V1EnvVar(name=\"SPECIAL_TYPE_KEY\")]\n",
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"container.env[0].value_from = client.V1EnvVarSource()\n",
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"container.env[0].value_from.config_map_key_ref = client.V1ConfigMapKeySelector(name=\"special-config\", key=\"special.how\")\n",
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"\n",
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"container.env[1].value_from = client.V1EnvVarSource()\n",
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"container.env[1].value_from.config_map_key_ref = client.V1ConfigMapKeySelector(name=\"special-config\", key=\"special.type\")"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": true
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},
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"outputs": [],
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"source": [
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"spec.restart_policy = \"Never\"\n",
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"spec.containers = [container]\n",
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"pod.spec = spec"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"api_instance.create_namespaced_pod(namespace=\"default\",body=pod)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": false,
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"scrolled": true
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},
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"outputs": [],
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"source": [
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"log = \"\"\n",
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"try: \n",
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" log = api_instance.read_namespaced_pod_log(name=\"dapi-test-pod\", namespace=\"default\")\n",
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"except ApiException as e:\n",
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" if str(e).find(\"ContainerCreating\") != -1:\n",
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" print(\"Creating Pod container.\\nRe-run current cell.\")\n",
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" else:\n",
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" print(\"Exception when calling CoreV1Api->read_namespaced_pod_log: %s\\n\" % e)\n",
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"\n",
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"for line in log.split(\"\\n\"):\n",
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" if line.startswith(\"SPECIAL\"):\n",
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" print(line)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": false
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},
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"outputs": [],
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"source": [
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"api_instance.delete_namespaced_config_map(name=\"special-config\", namespace=\"default\", body=cmap)"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": false,
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"scrolled": true
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},
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"outputs": [],
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"source": [
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"api_instance.delete_namespaced_pod(name=\"dapi-test-pod\", namespace=\"default\", body=client.V1DeleteOptions())"
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]
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {
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"collapsed": true
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},
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"outputs": [],
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"source": []
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 2",
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"language": "python",
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"name": "python2"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 2
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython2",
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"version": "2.7.13"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 2
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}

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