From fa1e29023fc8680202566490b003e70233b05a0a Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Nicolas=20Mass=C3=A9?= Date: Thu, 12 Jul 2018 22:20:39 +0200 Subject: [PATCH] final version --- Custom-HTTP-Probe/.gitignore | 1 + Custom-HTTP-Probe/README.md | 149 +++++++++++ Custom-HTTP-Probe/package-lock.json | 373 ++++++++++++++++++++++++++++ Custom-HTTP-Probe/probe.py | 30 +++ 4 files changed, 553 insertions(+) create mode 100644 Custom-HTTP-Probe/.gitignore create mode 100644 Custom-HTTP-Probe/README.md create mode 100644 Custom-HTTP-Probe/package-lock.json create mode 100755 Custom-HTTP-Probe/probe.py diff --git a/Custom-HTTP-Probe/.gitignore b/Custom-HTTP-Probe/.gitignore new file mode 100644 index 0000000..b512c09 --- /dev/null +++ b/Custom-HTTP-Probe/.gitignore @@ -0,0 +1 @@ +node_modules \ No newline at end of file diff --git a/Custom-HTTP-Probe/README.md b/Custom-HTTP-Probe/README.md new file mode 100644 index 0000000..8676187 --- /dev/null +++ b/Custom-HTTP-Probe/README.md @@ -0,0 +1,149 @@ +# Custom HTTP Probe + +## Context + +An application is deployed in OpenShift and has no built-in liveness/readiness +probes. This example shows how to implement a custom probe. + +## The sample application + +This sample app has three probes: + +- a standard liveness probe +- a standard readiness probe +- a custom probe + +The app takes about 30 seconds to boot and then exhibit two endpoints: + +- `/please-die` will switch the liveness probe to "dead" +- `/please-resuscitate` will switch the liveness probe to "alive" + +The custom probe is a mix of everything you can find in a business app: + +- when the app is alive, it returns a non-200 HTTP status with JSON content +- when the app is dead, it returns a 500 HTTP status with HTML content + +## Deploy the sample application + +```sh +oc new-app nodejs~https://github.com/nmasse-itix/OpenShift-Examples.git --name myapp --context-dir=Custom-HTTP-Probe +oc expose svc/myapp +``` + +## Play with it + +```sh +export SAMPLE_APP_URL="http://$(oc get route myapp -o jsonpath='{.spec.host}')" && echo $SAMPLE_APP_URL +``` + +Print some help: + +```sh +curl $SAMPLE_APP_URL/ -D - +``` + +Check if the app is ready: + +```sh +curl $SAMPLE_APP_URL/probe/readiness -D - +``` + +Let the app die: + +```sh +curl $SAMPLE_APP_URL/please-die -D - +``` + +Check if the app is alive: + +```sh +curl $SAMPLE_APP_URL/probe/liveness -D - +``` + +Let the app resuscitate: + +```sh +curl $SAMPLE_APP_URL/please-resuscitate -D - +``` + +Inspect the custom probe: + +```sh +curl $SAMPLE_APP_URL/please-die -D - +curl $SAMPLE_APP_URL/probe/custom -D - +``` + +```sh +curl $SAMPLE_APP_URL/please-resuscitate -D - +curl $SAMPLE_APP_URL/probe/custom -D - +``` + +## Use the standard probes + +Add the liveness probe: + +```sh +oc patch dc myapp --type=json -p '[ { "op": "add", "path": "/spec/template/spec/containers/0/livenessProbe", "value": { "initialDelaySeconds": 5, "timeoutSeconds": 5, "httpGet": { "path": "/probe/liveness", "port": 8080 } } } ]' +``` + +Add the readiness probe: + +```sh +oc patch dc myapp --type=json -p '[ { "op": "add", "path": "/spec/template/spec/containers/0/readinessProbe", "value": { "initialDelaySeconds": 20, "timeoutSeconds": 5, "httpGet": { "path": "/probe/readiness", "port": 8080 } } } ]' +``` + +Watch the deployment: + +```sh +oc get pods -w +``` + +Let the app die: + +```sh +curl $SAMPLE_APP_URL/please-die -D - +``` + +Watch the app being restarted: + +```sh +oc get pods -w +``` + +## Use the custom probe + +Review the [probe.py code](probe.py). + +Create a configMap containing the custom probe code: + +```sh +oc create configmap myapp-probe --from-file probe.py +``` + +Mount the configMap on `/opt/probe`: + +```sh +oc volume dc/myapp --add --overwrite --type=configMap --configmap-name=myapp-probe --default-mode=755 --mount-path=/opt/probe --name probe --confirm +``` + +Replace the standard liveness and readiness probes by the custom one: + +```sh +oc patch dc myapp --type=json -p '[ { "op": "replace", "path": "/spec/template/spec/containers/0/livenessProbe", "value": { "initialDelaySeconds": 5, "timeoutSeconds": 5, "exec": { "command": [ "/opt/probe/probe.py", "http://localhost:8080/probe/custom" ] } } } ]' +``` + +```sh +oc patch dc myapp --type=json -p '[ { "op": "replace", "path": "/spec/template/spec/containers/0/readinessProbe", "value": { "initialDelaySeconds": 5, "timeoutSeconds": 5, "exec": { "command": [ "/opt/probe/probe.py", "http://localhost:8080/probe/custom" ] } } } ]' +``` + +Let the app die: + +```sh +curl $SAMPLE_APP_URL/please-die -D - +``` + +Watch the app being restarted: + +```sh +oc get pods -w +``` \ No newline at end of file diff --git a/Custom-HTTP-Probe/package-lock.json b/Custom-HTTP-Probe/package-lock.json new file mode 100644 index 0000000..52d1a60 --- /dev/null +++ b/Custom-HTTP-Probe/package-lock.json @@ -0,0 +1,373 @@ +{ + "name": "sample-app", + "version": "0.0.1", + "lockfileVersion": 1, + "requires": true, + "dependencies": { + "accepts": { + "version": "1.3.5", + "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.5.tgz", + 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0000000..5df18f2 --- /dev/null +++ b/Custom-HTTP-Probe/probe.py @@ -0,0 +1,30 @@ +#!/usr/bin/python + +import sys +import httplib +from urlparse import urlparse + +if len (sys.argv) != 2 : + print "Usage: probe.py url" + sys.exit(1) + +url = sys.argv[1] +print("Checking " + url + "...") + +components = urlparse(url) + +connection = httplib.HTTPConnection(components.netloc, timeout = 5) +connection.request("GET", components.path) +response = connection.getresponse() + +status = response.status +content_type = response.getheader('Content-Type', "") +response.read() +connection.close() + +if status == 418 and content_type.startswith('application/json') : + print("OK") + sys.exit(0) +else : + print("KO " + str(status) + " " + content_type) + sys.exit(1)