nmasse
4 years ago
commit
9ad0b6828f
9 changed files with 543 additions and 0 deletions
@ -0,0 +1,3 @@ |
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golang-health-check |
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__debug_bin |
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bindata.go |
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@ -0,0 +1,158 @@ |
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apiVersion: v1 |
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|
kind: Template |
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|
metadata: |
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|
name: launchpad-builder |
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|
annotations: |
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|
description: This template creates a Build Configuration using an S2I builder. |
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|
tags: instant-app |
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|
parameters: |
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|
- name: SUFFIX_NAME |
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|
description: The suffix name for the template objects |
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|
displayName: Suffix name |
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|
value: '' |
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|
- name: RELEASE_VERSION |
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|
description: The release version number of application |
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|
displayName: Release version |
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|
value: 1.0.0 |
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|
- name: SOURCE_REPOSITORY_URL |
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|
description: The source URL for the application |
||||
|
displayName: Source URL |
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|
required: true |
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|
- name: SOURCE_REPOSITORY_REF |
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|
description: The branch name for the application |
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|
displayName: Source Branch |
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|
value: master |
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|
required: true |
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|
objects: |
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|
- apiVersion: image.openshift.io/v1 |
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|
kind: ImageStream |
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|
metadata: |
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name: 'golang-health-check${SUFFIX_NAME}' |
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labels: |
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version: '${RELEASE_VERSION}' |
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app: golang-health-check |
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spec: {} |
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|
- apiVersion: v1 |
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kind: BuildConfig |
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|
metadata: |
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name: 'golang-health-check-s2i${SUFFIX_NAME}' |
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labels: |
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|
app: golang-health-check |
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version: '${RELEASE_VERSION}' |
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spec: |
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|
output: |
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to: |
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|
kind: ImageStreamTag |
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|
name: 'golang-health-check${SUFFIX_NAME}:${RELEASE_VERSION}' |
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|
postCommit: {} |
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|
resources: {} |
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|
source: |
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|
git: |
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|
uri: '${SOURCE_REPOSITORY_URL}' |
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|
ref: '${SOURCE_REPOSITORY_REF}' |
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|
type: Git |
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|
strategy: |
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|
type: Source |
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|
sourceStrategy: |
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|
from: |
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|
kind: DockerImage |
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|
name: 'registry.fedoraproject.org/f29/golang' |
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|
incremental: true |
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|
status: |
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|
lastVersion: 0 |
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|
- apiVersion: v1 |
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|
kind: Service |
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|
spec: |
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|
ports: |
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|
- protocol: TCP |
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|
port: 8080 |
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targetPort: 8080 |
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type: ClusterIP |
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selector: |
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project: golang-health-check |
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|
provider: golang-starters |
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|
metadata: |
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name: 'golang-health-check${SUFFIX_NAME}' |
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|
labels: |
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app: golang-health-check |
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|
provider: golang-starters |
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|
expose: 'true' |
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|
project: golang-health-check |
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version: '${RELEASE_VERSION}' |
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|
- apiVersion: v1 |
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|
kind: DeploymentConfig |
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|
metadata: |
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|
name: 'golang-health-check${SUFFIX_NAME}' |
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|
labels: |
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|
app: golang-health-check |
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|
provider: golang-starters |
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|
project: golang-health-check |
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|
version: '${RELEASE_VERSION}' |
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|
spec: |
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|
template: |
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|
spec: |
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|
containers: |
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|
- readinessProbe: |
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|
httpGet: |
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|
path: /api/health |
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|
port: 8080 |
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|
scheme: HTTP |
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|
failureThreshold: 3 |
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|
initialDelaySeconds: 10 |
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|
periodSeconds: 5 |
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|
successThreshold: 1 |
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|
timeoutSeconds: 1 |
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|
livenessProbe: |
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|
httpGet: |
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|
path: /api/health |
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|
port: 8080 |
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|
scheme: HTTP |
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|
failureThreshold: 2 |
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|
initialDelaySeconds: 60 |
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|
periodSeconds: 3 |
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|
successThreshold: 1 |
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|
timeoutSeconds: 1 |
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image: '' |
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name: golang-health-check |
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securityContext: |
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|
privileged: false |
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|
ports: |
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|
- containerPort: 8080 |
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|
name: http |
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|
protocol: TCP |
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|
metadata: |
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|
labels: |
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|
app: golang-health-check |
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|
project: golang-health-check |
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|
provider: golang-starters |
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|
version: '${RELEASE_VERSION}' |
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|
replicas: 1 |
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|
selector: |
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|
app: golang-health-check |
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|
project: golang-health-check |
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|
provider: golang-starters |
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|
triggers: |
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|
- type: ConfigChange |
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|
- type: ImageChange |
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|
imageChangeParams: |
||||
|
automatic: true |
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|
containerNames: |
||||
|
- golang-health-check |
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|
from: |
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|
kind: ImageStreamTag |
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|
name: 'golang-health-check${SUFFIX_NAME}:${RELEASE_VERSION}' |
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|
- apiVersion: v1 |
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|
kind: Route |
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|
metadata: |
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|
labels: |
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|
app: golang-health-check |
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|
project: golang-health-check |
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|
provider: golang-starters |
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|
version: '${RELEASE_VERSION}' |
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|
name: 'golang-health-check${SUFFIX_NAME}' |
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|
spec: |
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|
port: |
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|
targetPort: 8080 |
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|
to: |
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|
kind: Service |
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|
name: 'golang-health-check${SUFFIX_NAME}' |
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@ -0,0 +1,13 @@ |
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{ |
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|
"version": "0.2.0", |
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|
"configurations": [ |
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|
|
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|
{ |
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|
"name": "Debug current file", |
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|
"type": "go", |
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|
"request": "launch", |
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|
"mode": "auto", |
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|
"program": "${fileDirname}" |
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|
} |
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|
] |
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|
} |
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@ -0,0 +1,201 @@ |
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|
Apache License |
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|
Version 2.0, January 2004 |
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|
http://www.apache.org/licenses/ |
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|
|
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|
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION |
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|
1. Definitions. |
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"License" shall mean the terms and conditions for use, reproduction, |
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and distribution as defined by Sections 1 through 9 of this document. |
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"Licensor" shall mean the copyright owner or entity authorized by |
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the copyright owner that is granting the License. |
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"Legal Entity" shall mean the union of the acting entity and all |
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"control" means (i) the power, direct or indirect, to cause the |
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direction or management of such entity, whether by contract or |
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|
"You" (or "Your") shall mean an individual or Legal Entity |
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"Source" form shall mean the preferred form for making modifications, |
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END OF TERMS AND CONDITIONS |
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APPENDIX: How to apply the Apache License to your work. |
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To apply the Apache License to your work, attach the following |
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Licensed under the Apache License, Version 2.0 (the "License"); |
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Unless required by applicable law or agreed to in writing, software |
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See the License for the specific language governing permissions and |
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limitations under the License. |
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@ -0,0 +1,16 @@ |
|||||
|
# Golang Health Check |
||||
|
A booster demonstrating health checks and recovery using the kubernetes/openshift |
||||
|
`liveliness` and `readiness` probes. |
||||
|
|
||||
|
|
||||
|
# How to run |
||||
|
The project uses openshift s2i to build docker image. Run the following command |
||||
|
to build the docker image |
||||
|
|
||||
|
```s2i build . registry.fedoraproject.org/f29/golang golang-health-check``` |
||||
|
|
||||
|
To start the web service, run |
||||
|
|
||||
|
```docker run -p 8080:8080 golang-health-check``` |
||||
|
|
||||
|
The web service should now be accessible on `http://localhost:8080` |
||||
@ -0,0 +1,3 @@ |
|||||
|
module github.com/golang-starters/golang-health-check |
||||
|
|
||||
|
require github.com/elazarl/go-bindata-assetfs v1.0.0 |
||||
@ -0,0 +1,2 @@ |
|||||
|
github.com/elazarl/go-bindata-assetfs v1.0.0 h1:G/bYguwHIzWq9ZoyUQqrjTmJbbYn3j3CKKpKinvZLFk= |
||||
|
github.com/elazarl/go-bindata-assetfs v1.0.0/go.mod h1:v+YaWX3bdea5J/mo8dSETolEo7R71Vk1u8bnjau5yw4= |
||||
@ -0,0 +1,45 @@ |
|||||
|
package main |
||||
|
|
||||
|
import ( |
||||
|
"fmt" |
||||
|
"log" |
||||
|
"net/http" |
||||
|
) |
||||
|
|
||||
|
var isOnline = true |
||||
|
|
||||
|
func main() { |
||||
|
http.HandleFunc("/api/greeting", greeting) |
||||
|
http.HandleFunc("/api/stop", stop) |
||||
|
http.HandleFunc("/api/health", health) |
||||
|
http.Handle("/", http.FileServer(assetFS())) |
||||
|
fmt.Println("Web server running on port 8080") |
||||
|
|
||||
|
log.Fatal(http.ListenAndServe(":8080", nil)) |
||||
|
} |
||||
|
|
||||
|
func greeting(w http.ResponseWriter, r *http.Request) { |
||||
|
if isOnline { |
||||
|
message := "World" |
||||
|
if m := r.FormValue("name"); m != "" { |
||||
|
message = m |
||||
|
} |
||||
|
fmt.Fprintf(w, "Hello %s!", message) |
||||
|
return |
||||
|
} |
||||
|
w.WriteHeader(503) |
||||
|
w.Write([]byte("Not Online")) |
||||
|
} |
||||
|
|
||||
|
func stop(w http.ResponseWriter, r *http.Request) { |
||||
|
isOnline = false |
||||
|
w.Write([]byte("Stopping HTTP Server")) |
||||
|
} |
||||
|
|
||||
|
func health(w http.ResponseWriter, r *http.Request) { |
||||
|
if isOnline { |
||||
|
w.WriteHeader(200) |
||||
|
return |
||||
|
} |
||||
|
w.WriteHeader(500) |
||||
|
} |
||||
@ -0,0 +1,102 @@ |
|||||
|
<html> |
||||
|
<head> |
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|
<meta charset="utf-8"> |
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|
<title>Health Check Mission - Golang</title> |
||||
|
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" |
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|
crossorigin="anonymous"> |
||||
|
</head> |
||||
|
|
||||
|
<body> |
||||
|
<div class="container"> |
||||
|
<div> |
||||
|
<div class="sect1"> |
||||
|
<h2 id="_health_check_booster">Health Check Booster</h2> |
||||
|
<div class="sectionbody"> |
||||
|
<div class="paragraph"> |
||||
|
<p>Demonstrates how the Kubernetes/Openshift health checks work to determine if a container is still alive (the <em>liveness</em> |
||||
|
of the container) and ready to serve the traffic for the HTTP endpoints of the application (the <em>readiness</em> |
||||
|
of the container).</p> |
||||
|
</div> |
||||
|
<div class="paragraph"> |
||||
|
<p>To demonstrate this behavior, the application configures a <code>/health</code> HTTP endpoint, which is |
||||
|
used |
||||
|
by Kubernetes/Openshift to issue HTTP requests. If the container is still alive—which means the Health HTTP |
||||
|
endpoint |
||||
|
is able to reply—the management platform will receive HTTP code 200 as a response, and no further action |
||||
|
is taken. After you click the |
||||
|
<code>Stop Service</code> button, the HTTP endpoint starts |
||||
|
returning a 500 response, and the platform then |
||||
|
restarts |
||||
|
the pod with the failed container. While the pod is down, the booster UI polls the service |
||||
|
periodically |
||||
|
until the pod is restarted. In the meantime, do <strong>not</strong> refresh the page because it will |
||||
|
not be served until the pod finishes restarting.</p> |
||||
|
</div> |
||||
|
<div class="sect2"> |
||||
|
<h3 id="_using_the_greeting_service">Using the greeting service</h3> |
||||
|
</div> |
||||
|
</div> |
||||
|
</div> |
||||
|
|
||||
|
<form class="form-inline"> |
||||
|
<div class="form-group"> |
||||
|
<label for="name">Name</label> |
||||
|
<input type="text" class="form-control" id="name" placeholder="World"> |
||||
|
</div> |
||||
|
<button id="invoke" type="submit" class="btn btn-success">Invoke</button> |
||||
|
<button id="stop" type="submit" class="btn btn-danger">Stop Service</button> |
||||
|
</form> |
||||
|
|
||||
|
<h3>Result:</h3> |
||||
|
<pre><code id="greeting-result">Invoke the service to see the result.</code></pre> |
||||
|
</div> |
||||
|
</div> |
||||
|
|
||||
|
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script> |
||||
|
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" |
||||
|
crossorigin="anonymous"></script> |
||||
|
|
||||
|
<script> |
||||
|
var stopTime; |
||||
|
var attempts; |
||||
|
|
||||
|
function invokeService() { |
||||
|
var n = $("#name").val() || "World"; |
||||
|
$.get("/api/greeting?name=" + n, function (res) { |
||||
|
$("#greeting-result").html(res); |
||||
|
}); |
||||
|
} |
||||
|
|
||||
|
function invokeServiceandRetryUponFailures() { |
||||
|
var n = $("#name").val() || "World"; |
||||
|
$.get("/api/greeting?name=" + n, function (res) { |
||||
|
var rebirth = new Date(); |
||||
|
var diff = (stopTime.getTime() - rebirth.getTime()) / 1000; |
||||
|
var abs = Math.abs(diff); |
||||
|
$("#greeting-result").html(res + " (the recovery took " + abs + " seconds)"); |
||||
|
}) |
||||
|
.fail(function () { |
||||
|
$("#greeting-result").html("[" + ++attempts + "] Service not available... Retrying in 2 seconds"); |
||||
|
setTimeout(invokeServiceandRetryUponFailures, 2000); |
||||
|
}); |
||||
|
} |
||||
|
|
||||
|
$(document).ready(function () { |
||||
|
$("#invoke").click(function (e) { |
||||
|
invokeService(); |
||||
|
e.preventDefault(); |
||||
|
}); |
||||
|
|
||||
|
$("#stop").click(function (e) { |
||||
|
$.get("/api/stop", function (data) { |
||||
|
$("#greeting-result").html("The application has been stopped..."); |
||||
|
stopTime = new Date(); |
||||
|
attempts = 0; |
||||
|
setTimeout(invokeServiceandRetryUponFailures, 2000); |
||||
|
}); |
||||
|
e.preventDefault(); |
||||
|
}); |
||||
|
}); |
||||
|
</script> |
||||
|
</body> |
||||
|
</html> |
||||
Loading…
Reference in new issue