paulbouwer/hello-kubernetes

Provides a demo app to deploy to a Kubernetes cluster. It displays a message, the name of the pod and details of the node it's deployed to.

hello-kubernetes's Issues

EXTERNAL-IP stuck on pending status

When I run kubectl get services

NAME               TYPE           CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
hello-kubernetes   LoadBalancer   10.100.179.79   <pending>     80:30607/TCP   37m

and not have any errors in events service

---

edit :
I change the type of service from LoadBalancer to NodePort because I run cluster on-prem. not support type LoadBalancer

Add additional service examples

Refer to: #1

Add examples for local and on-prem clusters that leverage NodePort instead of LoadBalancer.

is it at https://artifacthub.io?

is this one , how can i use it?
https://artifacthub.io/packages/helm/opsmx/hello-kubernetes

PORT env variable not working

Might need to use parseInt such that it gives a number to app.listen

exec format error

Hi, I've deployed hello-kubernetes to a 4 node raspberry pi k3s cluster and I'm getting the following output:

$ kubectl get service hello-kubernetes-custom
NAME                      TYPE           CLUSTER-IP    EXTERNAL-IP   PORT(S)        AGE
hello-kubernetes-custom   LoadBalancer   10.43.27.83   <pending>     80:31288/TCP   13m
$ kubectl get pods
NAME                                       READY   STATUS             RESTARTS   AGE
svclb-hello-kubernetes-custom-snkgf        0/1     Pending            0          13m
svclb-hello-kubernetes-custom-f44xh        0/1     Pending            0          13m
svclb-hello-kubernetes-custom-cghph        0/1     Pending            0          13m
svclb-hello-kubernetes-custom-kfqgg        0/1     Pending            0          13m
hello-kubernetes-custom-6468f86645-x98pq   0/1     CrashLoopBackOff   7          13m
hello-kubernetes-custom-6468f86645-mv2q6   0/1     CrashLoopBackOff   7          13m
hello-kubernetes-custom-6468f86645-gvwcd   0/1     CrashLoopBackOff   7          13m
$ kubectl logs svclb-hello-kubernetes-custom-snkgf
$ kubectl logs hello-kubernetes-custom-6468f86645-x98pq
standard_init_linux.go:211: exec user process caused "exec format error"

What could I look at in order to find out what's going wrong?

When using pathPrefix in helm, Readiness and liveness prob are in failure

Make the path of the Readiness and Liveness prob dynamically with the value of the pathPrefix of the helm chart like this :
livenessProbe:
httpGet:
path: /"{{ .Values.ingress.pathPrefix }}"
port: http
readinessProbe:
httpGet:
path: /"{{ .Values.ingress.pathPrefix }}"
port: http

background-color is slightly off.

the background-color element for the body is close to the K8s image background, but slightly off. This is uncomfortable 😢

Current background is: #303030 and the K8s image has a background color of #333333.

Build error from org.opencontainers.image.description

Failed to build this image using Kaniko. It's unhappy parsing the ' character in the word it's.

error building image: error building stage: failed to process "Provides a demo image to deploy to a Kubernetes cluster. It displays a message, the name of the pod and details of the node it's deployed to.": unexpected end of statement while looking for matching single-quote

Will raise a quick PR to escape this character and link it to this issue 👍

Please provide a single file yaml, it's very useful

Hi! I really love this project, I always use this project as an example when I show how Kubernetes could do to my friends. With a simple kubectl apply -f <link> I could raise some instances of an application, that's awesome.

But after using helm, there are more steps to do and more concepts to introduce, so I think providing a single file manifest might be better.

I think helm template could render that single file manifest without modifying anything already existing.

Document how to delete the deployment

After trying this out (as a very new-to-Kubernetes person) I had a lot of trouble figuring out how to remove it again.

Eventually this worked for me:

kubectl delete deployment hello-kubernetes-hello-world -n hello-kubernetes

Would be great if the README covered this!

Ingress example not working

Hello,

The ingress example isn't working because now the api used is the networking v1 and the syntax doesn't seem to be recognized
Tested with GKE 1.21.5
Thank you.

Name:             hello-kubernetes-ingress
Namespace:        hello-kubernetes
Address:          
Default backend:  default-http-backend:80 (10.20.0.7:8080)
TLS:
  hello-prod terminates XXXXXXXXXXX
Rules:
  Host        Path  Backends
  ----        ----  --------
  *           
              /hello-world(/|$)(.*)   hello-kubernetes-hello-world:80 (10.20.0.31:8080,10.20.1.30:8080)
Annotations:  acme.cert-manager.io/http01-edit-in-place: true
              cert-manager.io/cluster-issuer: letsencrypt
              kubernetes.io/ingress.class: nginx
              nginx.ingress.kubernetes.io/rewrite-target: /$2
Events:
  Type     Reason          Age                   From                      Message
  ----     ------          ----                  ----                      -------
  Warning  Rejected        <invalid>             nginx-ingress-controller  hello-kubernetes/hello-kubernetes-ingress was rejected: with error: spec.rules[0].host: Required value
  Warning  Rejected        <invalid>             nginx-ingress-controller  hello-kubernetes/hello-kubernetes-ingress was rejected: with error: spec.rules[0].host: Required value
  Warning  Rejected        <invalid>             nginx-ingress-controller  spec.rules[0].host: Required value
  Warning  Rejected        <invalid>             nginx-ingress-controller  spec.rules[0].host: Required value

Handlebar value injection refactor necessary to prevent unstyled content and missing images on missing env var

This and this - the leading slash in the template causes this to occur when RENDER_PATH_PREFIX is undefined and the context root of the application is not / (e.g. this container is deployed to a path behind a LB on a route):

I suggest adding the slash at the end of the injected env var here:

hello-kubernetes/src/app/server.js

Line 22 in 6e9ac0e

'/' + process.env.RENDER_PATH_PREFIX.replace(/^[\\/]+/, '').replace(/[\\/]+$/, '') :

- a trailing slash, even if redundant should not affect route resolution, so it would be a safer default IMO.

Docker build issue

Hello.

I tried to build my own docker image of hello-kubernetes but it failed with the following:

pruzicka@peru:/tmp$ git clone https://github.com/paulbouwer/hello-kubernetes.git
Cloning into 'hello-kubernetes'...
remote: Enumerating objects: 47, done.
remote: Total 47 (delta 0), reused 0 (delta 0), pack-reused 47
Unpacking objects: 100% (47/47), done.

pruzicka@peru:/tmp$ cd hello-kubernetes/

pruzicka@peru:/tmp/hello-kubernetes$ docker build --no-cache --build-arg IMAGE_VERSION="1.5" --build-arg IMAGE_CREATE_DATE="`date -u +"%Y-%m-%dT%H:%M:%SZ"`" --build-arg IMAGE_SOURCE_REVISION="`git rev-parse HEAD`" -f Dockerfile -t "hello-kubernetes:1.5" .
STEP 1: FROM node:8.1.0-alpine
STEP 2: ARG IMAGE_CREATE_DATE
--> e2b7778e11159a7e1424b87c84ca8d27a237858623843af3e8a397a7020d0931
STEP 3: FROM e2b7778e11159a7e1424b87c84ca8d27a237858623843af3e8a397a7020d0931
STEP 4: ARG IMAGE_VERSION
--> e46d921f61fc5e811ce82df8e59034bce4b54969dfc8af33b967f0048efe9702
STEP 5: FROM e46d921f61fc5e811ce82df8e59034bce4b54969dfc8af33b967f0048efe9702
STEP 6: ARG IMAGE_SOURCE_REVISION
--> 1fd41214b517592d27f59fbf15adcc026330d3762e40d17c1aed3388817ef155
STEP 7: FROM 1fd41214b517592d27f59fbf15adcc026330d3762e40d17c1aed3388817ef155
STEP 8: LABEL org.opencontainers.image.title="Hello Kubernetes!"       org.opencontainers.image.description="Provides a demo image to deploy to a Kubernetes cluster. It displays a message, the name of the pod and details of the node it's deployed to."       org.opencontainers.image.created=$IMAGE_CREATE_DATE       org.opencontainers.image.version=$IMAGE_VERSION       org.opencontainers.image.authors="Paul Bouwer"       org.opencontainers.image.url="https://hub.docker.com/r/paulbouwer/hello-kubernetes/"       org.opencontainers.image.documentation="https://github.com/paulbouwer/hello-kubernetes/README.md"       org.opencontainers.image.vendor="Paul Bouwer"       org.opencontainers.image.licenses="MIT"       org.opencontainers.image.source="https://github.com/paulbouwer/hello-kubernetes.git"       org.opencontainers.image.revision=$IMAGE_SOURCE_REVISION 
--> d74196ebbc209a93d1b4c947201f03e22f1a577da1ebceaab20b33747fde3d63
STEP 9: FROM d74196ebbc209a93d1b4c947201f03e22f1a577da1ebceaab20b33747fde3d63
STEP 10: RUN mkdir -p /usr/src/app
--> 1bff185a722521479a48a5096323f28cc3f6c526da0925e9a1451cd899bbd110
STEP 11: FROM 1bff185a722521479a48a5096323f28cc3f6c526da0925e9a1451cd899bbd110
STEP 12: WORKDIR /usr/src/app
--> 7a406bc68e4ec7cb316cf727702002f32b6a53b32c9717ebc21d3466722f0145
STEP 13: FROM 7a406bc68e4ec7cb316cf727702002f32b6a53b32c9717ebc21d3466722f0145
STEP 14: COPY package.json /usr/src/app/
--> 1d344902b0e799ad643b0f50764ecf47c3874fd32b5ade8aac547f32e4fcdc45
STEP 15: FROM 1d344902b0e799ad643b0f50764ecf47c3874fd32b5ade8aac547f32e4fcdc45
STEP 16: RUN npm install
npm info it worked if it ends with ok
npm info using [email protected]
npm info using [email protected]
npm info lifecycle [email protected]~preinstall: [email protected]
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npm WARN [email protected] No repository field.
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npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, chown '/usr/src/app/node_modules/.staging/escape-html-19e422e3/index.js'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fs.realpath):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, chown '/usr/src/app/node_modules/.staging/fs.realpath-3a55e89b/LICENSE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/commander):
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npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/promise):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, open '/usr/src/app/node_modules/.staging/promise-259b0227/core.js'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/forwarded):
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npm WARN optional SKIPPING OPTIONAL DEPENDENCY: File exists: /usr/src/app/node_modules/.staging/forwarded-d3060e18
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/fresh):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, open '/usr/src/app/node_modules/.staging/fresh-a5e59a9e/index.js'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/proxy-addr):
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: EEXIST: file already exists, mkdir '/usr/src/app/node_modules/.staging/proxy-addr-f1ed8e03'
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npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/qs):
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npm WARN optional SKIPPING OPTIONAL DEPENDENCY: File exists: /usr/src/app/node_modules/.staging/qs-e6c3fcbe
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/object.assign):
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npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, open '/usr/src/app/node_modules/.staging/function-bind-bb6ddbb5/LICENSE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/parseurl):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, open '/usr/src/app/node_modules/.staging/parseurl-16e134eb/LICENSE'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/cookie):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, open '/usr/src/app/node_modules/.staging/cookie-a49deb4e/index.js'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/asap):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, open '/usr/src/app/node_modules/.staging/asap-cefcd946/browser-asap.js'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/mime-db):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, utime '/usr/src/app/node_modules/.staging/mime-db-2f461d15/db.json'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/define-properties):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, utime '/usr/src/app/node_modules/.staging/define-properties-a059d705/.travis.yml'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/balanced-match):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, chmod '/usr/src/app/node_modules/.staging/balanced-match-3704cf2b/LICENSE.md'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/concat-map):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, chmod '/usr/src/app/node_modules/.staging/concat-map-224ae118/README.markdown'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/cookie-signature):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, chmod '/usr/src/app/node_modules/.staging/cookie-signature-33da35d7/Readme.md'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/accepts):
npm WARN enoent SKIPPING OPTIONAL DEPENDENCY: ENOENT: no such file or directory, chmod '/usr/src/app/node_modules/.staging/accepts-1f775a13/README.md'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: [email protected] (node_modules/object-keys):
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: EEXIST: file already exists, mkdir '/usr/src/app/node_modules/.staging/object-keys-4605d883'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: File exists: /usr/src/app/node_modules/.staging/object-keys-4605d883

npm ERR! path /usr/src/app/node_modules/.staging/content-type-2bcca7b5
npm ERR! code EINVAL
npm ERR! errno -22
npm ERR! syscall chown
npm ERR! EINVAL: invalid argument, chown '/usr/src/app/node_modules/.staging/content-type-2bcca7b5'

npm ERR! A complete log of this run can be found in:
npm ERR!     /root/.npm/_logs/2019-05-06T11_21_24_423Z-debug.log
Error: error building at step {Env:[PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin NPM_CONFIG_LOGLEVEL=info NODE_VERSION=8.1.0 YARN_VERSION=0.24.6 IMAGE_SOURCE_REVISION=ec9d94923148f2a6bf99b725fc9f4e9acb260e3c IMAGE_VERSION=1.5 IMAGE_CREATE_DATE=2019-05-06T11:21:04Z] Command:run Args:[npm install] Flags:[] Attrs:map[] Message:RUN npm install Original:RUN npm install}: error while running runtime: exit status 234

Any idea how to fix it?

Thank you...

Not working when Policy runAsNonRoot is set, need to set securityContext.runAsUser

In our company's internally managed k8s platform the policy runAsNonRoot is set and this causes the deployment to fail with

Error: container has runAsNonRoot and image has non-numeric user (node), cannot verify user is non-root

After editing deployment.yaml and inserting this

      securityContext:
        runAsUser: 1000
        runAsGroup: 1000

in

hello-kubernetes/deploy/helm/hello-kubernetes/templates/deployment.yaml

Line 18 in c9d0a54

containers:

the chart could be installed successfully.

Vulnerability report - 5 Oct 2021

Update the base image to cater for the following CVEs:

• CVE-2021-3712 Package: libssl1.1 | openssl: Read buffer overruns processing ASN.1 strings
• CVE-2021-3711 Package: libssl1.1 | openssl: SM2 Decryption Buffer Overflow
• CVE-2021-3712 Package: libcrypto1.1 | openssl: Read buffer overruns processing ASN.1 strings
• CVE-2021-3711 Package: libcrypto1.1 | openssl: SM2 Decryption Buffer Overflow
• CVE-2021-36159 Package: apk-tools

Remediation:

• Update to Alpine 3.13
• Update container base image to node:16-alpine3.13

Readme - Yarn Over NPM

In the Develop Application section of the readme.md , you say to run the app with npm start.. It looks like in the Dockerfile you use yarn instead.. To avoid bundling the app with both yarn and npm I'd recommend to change the phrase in the Develop Application section from:

If you run npm start in the app

To

If you run yarn start in the app

EXTERNAL-IP stays in <pending> state

When I applied your .yaml to my two node cluster (one master, one worker) the external-ip stays in Here's the service and pod:

NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
hello-kubernetes LoadBalancer 10.110.156.22 80:30210/TCP 18m
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
hello-kubernetes-594f6f475f-4s9nw 1/1 Running 0 18m
hello-kubernetes-594f6f475f-7zb4h 1/1 Running 0 28s
hello-kubernetes-594f6f475f-jlrwb 1/1 Running 0 28s

Browser requests to port 30210 on either host is successful, but I should still be able to get an external-ip to connect on port 8080.

Do I need to change something in the .yaml to run on my two node cluster?

dg