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helm cheat sheet

package manager for Kubernetes
( similar to pip for python, similar to apt to debian )

links

helm charts

Architecture

main components

installation

sudo snap install helm --classic
curl https://raw.githubusercontent.com/kubernetes/helm/master/scripts/get | bash

de-installation

helm reset

initialization

helm init

# add new repo
helm repo add my_local_repo https://charts.bitnami.com/bitnami
# helm install --set replica.replicaCount=1 my_local_repo/redis

# sync latest available packages
helm repo update

useful variables

# the location of Helm's configuration
echo $HELM_HOME
# the host and port that Tiller is listening on
echo $TILLER_HOST
# the path to the helm command on your system
echo $HELM_BIN
# the full path to this plugin (not shown above, but we'll see it in a moment).
echo $HELM_PLUGIN_DIR

analyze local package

helm inspect { folder }
helm lint { folder }

search remote package

helm search 
helm describe {full name of the package}

information about remote package

helm info {name of resource}
helm status {name of resource}

create package locally

helm create

folder structure

create package with local templates

ls -la ~/.helm/starters/

install package

helm install { full name of the package }
helm install --name {my name for new package} { full name of the package }
helm install --name {my name for new package} --namespace {namespace} -f values.yml --debug --dry-run { full name of the package }

# some examples 
helm install bitname/postgresql
helm install oci://registry-1.docker.io/bitnamicharts/postgresql
helm install my_own_postgresql bitname/postgresql

install aws plugin

helm plugin install https://github.com/hypnoglow/helm-s3.git

list of installed packages

helm list
helm list --all
helm ls

package upgrade

local package

helm upgrade  {deployment/svc/rs/rc name} . --set replicas=2,maria.db.password="new password"

package by name

helm upgrade {name of package} {folder with helm scripts} --set replicas=2

check upgrade

helm history
helm rollback {name of package} {revision of history}

remove packageHelm

helm delete --purge {name of package}

trouble shooting

issue with 'helm list'

E1209 22:25:57.285192    5149 portforward.go:331] an error occurred forwarding 40679 -> 44134: error forwarding port 44134 to pod de4963c7380948763c96bdda35e44ad8299477b41b5c4958f0902eb821565b19, uid : unable to do port forwarding: socat not found.
Error: transport is closing

solution

sudo apt install socat

incompatible version of client and server

Error: incompatible versions client[v2.12.3] server[v2.11.0]

solution

helm init --upgrade
kubectl get pods --namespace kube-system # waiting for start Tiller
helm version

issue with postgresql, issue with mapping PV ebs.csi.aws.com

"message": "running PreBind plugin \"VolumeBinding\": binding volumes: timed out waiting for the condition",

create local storage class instead of mapping to external ( EBS )

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: local-storage
provisioner: kubernetes.io/no-provisioner
volumeBindingMode: Immediate
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: local-storage
spec:
  capacity:
    storage: 8Gi
  volumeMode: Filesystem
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Delete
  storageClassName: local-storage
  local:
    path: /tmp
  nodeAffinity:
    required:
      nodeSelectorTerms:
        - matchExpressions:
            - key: kubernetes.io/hostname
              operator: In
              values:
                - <NODE_INSTANCE_IP>
helm repo add $HELM_BITNAMI_REPO https://charts.bitnami.com/bitnami
helm install $K8S_SERVICE_POSTGRESQL $HELM_BITNAMI_REPO/postgresql --set global.storageClass=local-storage