Difference between revisions of "Helm"

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(Miscellaneousg examples)
 
Line 40: Line 40:
 
<pre>
 
<pre>
 
$ helm delete --purge ${MY_CHART_NAME}
 
$ helm delete --purge ${MY_CHART_NAME}
 +
</pre>
 +
 +
==Example Helm Charts==
 +
 +
===ConfigMap===
 +
 +
<pre>
 +
.
 +
├── Chart.yaml
 +
├── templates
 +
│   └── configmap.yaml
 +
└── values.yaml
 +
 +
$ cat values.yaml
 +
vaultConfigMap:
 +
  name: vault-demo
 +
  namespace: default
 +
  certificateAuthorityPem: |
 +
    -----BEGIN CERTIFICATE-----
 +
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
 +
    BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
 +
    CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
 +
    DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD==
 +
    -----END CERTIFICATE-----
 +
 +
$ cat templates/configmap.yaml
 +
apiVersion: v1
 +
kind: ConfigMap
 +
metadata:
 +
  name: {{ .Values.vaultConfigMap.name }}
 +
  namespace: {{ .Values.vaultConfigMap.namespace }}
 +
data:
 +
  ca.pem: |
 +
{{ .Values.vaultConfigMap.certificateAuthorityPem | indent 4 }}
 +
 +
$ helm template .
 +
---
 +
# Source: foobar/templates/configmap.yaml
 +
apiVersion: v1
 +
kind: ConfigMap
 +
metadata:
 +
  name: vault-demo
 +
  namespace: default
 +
data:
 +
  ca.pem: |
 +
    -----BEGIN CERTIFICATE-----
 +
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
 +
    BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
 +
    CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
 +
    DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD==
 +
    -----END CERTIFICATE-----
 +
 +
$ helm template . | kubectl create -f -
 +
configmap/vault-demo created
 +
 +
$ kubectl get cm vault-demo -o yaml
 +
apiVersion: v1
 +
data:
 +
  ca.pem: |
 +
    -----BEGIN CERTIFICATE-----
 +
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
 +
    BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
 +
    CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
 +
    DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD==
 +
    -----END CERTIFICATE-----
 +
kind: ConfigMap
 
</pre>
 
</pre>
  

Latest revision as of 17:02, 9 July 2020

Helm is a package manager for Kubernetes.

Commands

  • completion — generate autocompletions script for the specified shell (bash or zsh)
  • create — create a new chart with the given name
  • delete — given a release name, delete the release from Kubernetes
  • dependency — manage a chart's dependencies
  • fetch — download a chart from a repository and (optionally) unpack it in local directory
  • get — download a named release
  • help — help about any command
  • history — fetch release history
  • home — displays the location of HELM_HOME
  • init — initialize Helm on both client and server
  • inspect — inspect a chart
  • install — install a chart archive
  • lint — examines a chart for possible issues
  • list — list releases
  • package — package a chart directory into a chart archive
  • plugin — add, list, or remove Helm plugins
  • repo — add, list, remove, update, and index chart repositories
  • reset — uninstalls Tiller from a cluster
  • rollback — roll back a release to a previous revision
  • search — search for a keyword in charts
  • serve — start a local http web server
  • status — displays the status of the named release
  • template — locally render templates
  • test — test a release
  • upgrade — upgrade a release
  • verify — verify that a chart at the given path has been signed and is valid
  • version — print the client/server version information

Miscellaneous examples

  • Install a Helm Chart with:
$ helm upgrade --install ${MY_CHART_NAME} -f values.yaml --namespace=default .
  • Delete this Helm Chart (i.e., destroy what it created) with:
$ helm delete --purge ${MY_CHART_NAME}

Example Helm Charts

ConfigMap

.
├── Chart.yaml
├── templates
│   └── configmap.yaml
└── values.yaml

$ cat values.yaml 
vaultConfigMap:
  name: vault-demo
  namespace: default
  certificateAuthorityPem: |
    -----BEGIN CERTIFICATE-----
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
    CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
    DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD==
    -----END CERTIFICATE-----

$ cat templates/configmap.yaml 
apiVersion: v1
kind: ConfigMap
metadata:
  name: {{ .Values.vaultConfigMap.name }}
  namespace: {{ .Values.vaultConfigMap.namespace }}
data:
  ca.pem: |
{{ .Values.vaultConfigMap.certificateAuthorityPem | indent 4 }}

$ helm template .
---
# Source: foobar/templates/configmap.yaml
apiVersion: v1
kind: ConfigMap
metadata:
  name: vault-demo
  namespace: default
data:
  ca.pem: |
    -----BEGIN CERTIFICATE-----
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
    CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
    DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD==
    -----END CERTIFICATE-----

$ helm template . | kubectl create -f -
configmap/vault-demo created

$ kubectl get cm vault-demo -o yaml
apiVersion: v1
data:
  ca.pem: |
    -----BEGIN CERTIFICATE-----
    AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
    BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
    CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
    DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD==
    -----END CERTIFICATE-----
kind: ConfigMap

Deployment order

Helm collects all of the resources in a given Chart and its dependencies, groups them by resource type, and then installs them in the following order (as shown here):

  1. Namespace
  2. ResourceQuota
  3. LimitRange
  4. PodSecurityPolicy
  5. Secret
  6. ConfigMap
  7. StorageClass
  8. PersistentVolume
  9. PersistentVolumeClaim
  10. ServiceAccount
  11. CustomResourceDefinition
  12. ClusterRole
  13. ClusterRoleBinding
  14. Role
  15. RoleBinding
  16. Service
  17. DaemonSet
  18. Pod
  19. ReplicationController
  20. ReplicaSet
  21. Deployment
  22. StatefulSet
  23. Job
  24. CronJob
  25. Ingress
  26. APIService

During uninstallation of a release, the order is reversed (as shown here).

External links