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Kubernetes Developer Guide | Helm Development Guide | Reference Architecture

todo:  https://www.terraform.io/docs/providers/helm/index.html

Helm V2

We can run collocated helm installs by moving the helm binary to helm3 and installing helm2

helm v3 changes from v2 https://helm.sh/docs/faq/

  brew uninstall helm
  brew uninstall helm@2
  brew install helm@2
  helm version
  vi ~/.bash_profile 

add
export PATH="/usr/local/opt/helm@2/bin:$PATH"
  source ~/.bash_profile 
  helm version


# enable tiller in minikube

 kubectl -n kube-system create serviceaccount tiller
 kubectl create clusterrolebinding tiller --clusterrole=cluster-admin --serviceaccount=kube-system:tiller
 helm init --service-account tiller
 kubectl -n kube-system  rollout status deploy/tiller-deploy
 sudo helm init
 helm serve &
 helm repo add local http://127.0.0.1:8879
 helm repo list


Helm V3 

For kubernetes installation/development see Kubernetes Developer Guide

see also Asynchronous Messaging using Kafka#KafkaOperatorCharts

REF-3 - Getting issue details... STATUS

Install helm

Install Helm on OSX

https://helm.sh/docs/intro/install/

Install Brew 

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

biometric:wse_helm michaelobrien$ brew install helm
==> Downloading https://homebrew.bintray.com/bottles/helm-3.0.3.catalina.bottle.tar.gz
==> Downloading from https://akamai.bintray.com/59/5987c80ea21063f3c26a799889ad3e0b35c73275bd3579e5a1f6785d6f3f43d5?__gda__=exp=1581208465~hmac=fcf13391d90275fbcd6c015d86b3a0ec9abeb02aa1583eb3dca3f653da1aa281&response-content-disposition=attachment%3Bfilename%3D%22helm-3.0.3.catali
######################################################################## 100.0%
==> Pouring helm-3.0.3.catalina.bottle.tar.gz
==> Caveats
Bash completion has been installed to:
  /usr/local/etc/bash_completion.d

zsh completions have been installed to:
  /usr/local/share/zsh/site-functions
==> Summary
  /usr/local/Cellar/helm/3.0.3: 7 files, 40.6MB

biometric:wse_helm michaelobrien$ helm version
version.BuildInfo{Version:"v3.0.3", GitCommit:"ac925eb7279f4a6955df663a0128044a8a6b7593", GitTreeState:"clean", GoVersion:"go1.13.7"}

biometric:wse_go michaelobrien$ kubectl get services --all-namespaces
default       tomcat-dev                 LoadBalancer   10.103.194.12    localhost     80:32305/TCP                 75s

biometric:wse_go michaelobrien$ kubectl get pods --all-namespaces
NAMESPACE     NAME                                     READY   STATUS    RESTARTS   AGE
default       tomcat-dev-76d87c8fb6-9xjr6              1/1     Running   0          106s

biometric:wse_go michaelobrien$ helm list
NAME      	NAMESPACE	REVISION	UPDATED                             	STATUS  	CHART       	APP VERSION
tomcat-dev	default  	1       	2020-02-16 11:15:14.196403 -0500 EST	deployed	tomcat-0.4.1	7.0

Upgrade Helm using Brew

brew upgrade helm

==> Upgrading 1 outdated package:
helm 3.0.3 -> 3.2.1
==> Upgrading helm 3.0.3 -> 3.2.1

biometric:wse_helm $ helm version
version.BuildInfo{Version:"v3.2.1", GitCommit:"fe51cd1e31e6a202cba7dead9552a6d418ded79a", GitTreeState:"clean", GoVersion:"go1.13.10"}


Override values.yaml parameters in the default helm chart

root@tomcat-dev-76d87c8fb6-7nxjx:/usr/local/tomcat/logs# curl --head http://127.0.0.1:8080/sample
HTTP/1.1 302 Found
Server: Apache-Coyote/1.1
Location: /sample/
Transfer-Encoding: chunked
Date: Sun, 16 Feb 2020 18:15:28 GMT

root@tomcat-dev-76d87c8fb6-7nxjx:/usr/local/tomcat/logs# curl --head http://127.0.0.1:8080/sample/
HTTP/1.1 200 OK
Server: Apache-Coyote/1.1
Accept-Ranges: bytes
ETag: W/"636-1185812788000"
Last-Modified: Mon, 30 Jul 2007 16:26:28 GMT
Content-Type: text/html
Content-Length: 636
Date: Sun, 16 Feb 2020 18:16:02 GMT

curl http://192.168.20.144:80/sample/
192.168.65.3 - - [16/Feb/2020:18:21:18 +0000] "GET /sample/ HTTP/1.1" 200 636

change the port from 80 to 31111
helm upgrade tomcat-dev stable/tomcat --set service.externalPort=31111
default       tomcat-dev    LoadBalancer   10.97.22.152   localhost     31111:31962/TCP          26m

n> curl http://192.168.20.144:31111/sample/
StatusCode        : 200
StatusDescription : OK


Install Helm on Windows 10

https://github.com/helm/helm/releases/tag/v3.2.0

extract the zip and add the exe to your classpath
F:\opt\helm32\helm.exe

$ helm version
version.BuildInfo{Version:"v3.2.0", GitCommit:"e11b7ce3b12db2941e90399e874513fbd24bcb71", GitTreeState:"clean", GoVersion:"go1.13.10"}

Helm Chart Examples

Install Tomcat from a stable Helm chart

Follow https://github.com/helm/charts/tree/master/stable/tomcat

biometric:wse_go michaelobrien$ helm repo add stable https://kubernetes-charts.storage.googleapis.com
"stable" has been added to your repositories

biometric:wse_go michaelobrien$ helm install tomcat-dev stable/tomcat
NAME: tomcat-dev
LAST DEPLOYED: Sun Feb 16 11:15:14 2020
NAMESPACE: default
STATUS: deployed
REVISION: 1
TEST SUITE: None
NOTES:
1. Get the application URL by running these commands:
     NOTE: It may take a few minutes for the LoadBalancer IP to be available.
           You can watch the status of by running 'kubectl get svc -w tomcat-dev'
  export SERVICE_IP=$(kubectl get svc --namespace default tomcat-dev -o jsonpath='{.status.loadBalancer.ingress[0].hostname}')
  echo http://$SERVICE_IP:
biometric:wse_go michaelobrien$ export SERVICE_IP=$(kubectl get svc --namespace default tomcat-dev -o jsonpath='{.status.loadBalancer.ingress[0].hostname}')
biometric:wse_go michaelobrien$ echo http://$SERVICE_IP:
http://localhost:


Your own Helm charts

https://helm.sh/docs/using_helm/#quickstart-guide  - this example contains a default nginx server

Helm Lifecycle

Create Helm Chart

ubuntu@ip-172-31-81-46:~/obrienlabs$ sudo helm create difference-nbi
Creating difference-nbi
ubuntu@ip-172-31-81-46:~/obrienlabs$ ls difference-nbi/
Chart.yaml  charts  templates  values.yaml

Package Helm Chart

ubuntu@ip-172-31-81-46:~/obrienlabs/difference-nbi$ cd ..
ubuntu@ip-172-31-81-46:~/obrienlabs$ sudo helm package difference-nbi
Successfully packaged chart and saved it to: /home/ubuntu/obrienlabs/difference-nbi-0.1.0.tgz

package to local chart repo

Install Helm Chart

ubuntu@ip-172-31-81-46:~/obrienlabs$ helm install difference-nbi --name difference-nbi
NAME:   difference-nbi
LAST DEPLOYED: Mon Jun 10 19:00:59 2019
ubuntu@ip-172-31-81-46:~/obrienlabs$ kubectl get pods --all-namespaces
NAMESPACE       NAME                                      READY   STATUS      RESTARTS   AGE
default         difference-nbi-5fc754f69-hqkr2            1/1     Running     0          16s
ubuntu@ip-172-31-81-46:~/obrienlabs$ kubectl get services --all-namespaces
NAMESPACE       NAME                                   TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)                                  AGE
default         difference-nbi                         ClusterIP   10.43.82.98     <none>        80/TCP                                   75s
ubuntu@ip-172-31-81-46:~/charts/stable$ sudo helm ls
NAME          	REVISION	UPDATED                 	STATUS  	CHART                       	APP VERSION  	NAMESPACE
difference-nbi	1       	Mon Jun 10 19:00:59 2019	DEPLOYED	difference-nbi-0.1.0        	1.0          	default   

ubuntu@ubuntu:~$ kubectl port-forward difference-nbi-74955fd75b-9kgb2 8180:80
Forwarding from 127.0.0.1:8180 -> 80
Forwarding from [::1]:8180 -> 80

SCP Helm Chart and git commit it

obrienbiometrics:difference-kubernetes michaelobrien$ scp -rp ubuntu@rke.obrienlabs.cloud:~/obrienlabs/* .
Chart.yaml                                                                                                                                                     100%  110     1.4KB/s   00:00    
.helmignore                                                                                                                                                    100%  342     4.5KB/s   00:00    
values.yaml                                                                                                                                                    100% 1070    13.7KB/s   00:00    
service.yaml                                                                                                                                                   100%  611     7.1KB/s   00:00    
deployment.yaml                                                                                                                                                100% 1581    12.7KB/s   00:00    
ingress.yaml                                                                                                                                                   100% 1070    13.2KB/s   00:00    
_helpers.tpl                                                                                                                                                   100% 1066    14.3KB/s   00:00    
test-connection.yaml                                                                                                                                           100%  585     9.9KB/s   00:00    
NOTES.txt                                                                                                                                                      100% 1513    20.9KB/s   00:00


Upgrade Helm Chart

Use helm hooks to key into any part of the lifecycle.

ONAP references to helm upgrade

https://gitlab.com/obriensystems/oom/-/blob/master/kubernetes/helm/plugins/deploy/deploy.sh

https://git.onap.org/oom/tree/kubernetes/helm/plugins/deploy/deploy.sh#n184

https://docs.onap.org/en/elalto/submodules/oom.git/docs/oom_quickstart_guide.html

Issues with pod deletion - see https://github.com/obrienlabs/onap-root/blob/master/cd.sh#L63


Uninstall/delete Helm Chart

delete the chart, delete handing pods, optionally delete the pvc then pv.
sudo helm delete kafka
sudo helm del --purge kafka
kubectl delete pvc/datadir-kafka-0
or delete all in order

kubectl delete pvc --all
kubectl delete pv --all


Helm Backup Plugin

see https://github.com/maorfr/helm-backup from https://v2.helm.sh/docs/related/

sudo helm plugin install https://github.com/maorfr/helm-backup
helm install --namespace kafka --name kafka kafka/
sudo helm backup kafka
helm delete --purge kafka
sudo helm backup kafka --restore
biometric:incubator michaelobrien$ kubectl get pods --all-namespaces | grep kafka
kafka         kafka-0                                1/1     Running   1          2m53s
kafka         kafka-1                                1/1     Running   0          80s
kafka         kafka-2                                1/1     Running   0          47s
kafka         kafka-zookeeper-0                      1/1     Running   1          2m53s
kafka         kafka-zookeeper-1                      1/1     Running   0          2m17s
kafka         kafka-zookeeper-2                      1/1     Running   0          113s


Kubectl apply from Helm get/pull backup

There are cases where a deployed helm chart can be backed up to a single yaml using "helm get".  In order to redeploy this yaml without doing a helm install - the yaml must be edited to remove the initial values.yaml extract at the top before the first apiVersion line.

biometric:incubator michaelobrien$ sudo helm get kafka > kafka_get.yaml
biometric:incubator michaelobrien$ helm delete --purge kafka

biometric:incubator michaelobrien$ vi kafka_get.yaml
remove the following to avoid
error: error parsing kafka_get.yaml: error converting YAML to JSON: yaml: line 7: could not find expected ':'

REVISION: 1
RELEASED: Thu Jul 23 14:26:00 2020
CHART: kafka-0.21.2
USER-SUPPLIED VALUES: {}
...
to
HOOKS:

biometric:incubator michaelobrien$ kubectl apply -f kafka_get.yaml
pod/kafka-test-topic-create-consume-produce created
poddisruptionbudget.policy/kafka-zookeeper created
configmap/kafka-zookeeper created
service/kafka-zookeeper-headless created
service/kafka-zookeeper created
service/kafka created
service/kafka-headless created
statefulset.apps/kafka-zookeeper created
statefulset.apps/kafka created

biometric:incubator michaelobrien$ kubectl get pods --all-namespaces | grep kafka
default       kafka-0                                   1/1     Running   1          4m58s
default       kafka-1                                   1/1     Running   0          3m37s
default       kafka-2                                   1/1     Running   0          3m5s
default       kafka-test-topic-create-consume-produce   0/1     Error     0          4m58s
default       kafka-zookeeper-0                         1/1     Running   1          4m58s
default       kafka-zookeeper-1                         1/1     Running   0          4m24s
default       kafka-zookeeper-2                         1/1     Running   0          3m58s

biometric:incubator michaelobrien$ kubectl delete -f kafka_get.yaml 
pod "kafka-test-topic-create-consume-produce" deleted
poddisruptionbudget.policy "kafka-zookeeper" deleted
configmap "kafka-zookeeper" deleted
service "kafka-zookeeper-headless" deleted
service "kafka-zookeeper" deleted
service "kafka" deleted
service "kafka-headless" deleted
statefulset.apps "kafka-zookeeper" deleted
statefulset.apps "kafka" deleted


Helm v3 API

https://helm.sh/docs/faq/


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1 Comment

  1. Michael O'Brien

    For deployments

    pre kubernetes 1.16

    apiVersion: extensions/v1beta1

    kubernetes 1.16+ 

    apiVersion: apps/v1

    to avoid

    biometric:reference-helm michaelobrien$ helm install --name reference-nbi reference-nbi-0.1.0.tgz

    Error: validation failed: unable to recognize "": no matches for kind "Deployment" in version "extensions/v1beta1"


    with apps/v1

    biometric:reference-helm michaelobrien$ helm install --name reference-nbi reference-nbi-0.1.0.tgz

    NAME:   reference-nbi

    LAST DEPLOYED: Wed Jul 15 21:18:54 2020

    NAMESPACE: default

    STATUS: DEPLOYED


    RESOURCES:

    ==> v1/Deployment

    NAME           READY  UP-TO-DATE  AVAILABLE  AGE

    reference-nbi  0/1    1           0          0s


    default       reference-nbi-6bf49d969d-wrhrh     1/1     Running   0          33s

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