Kubernetes : Install Helm2023/10/20 |
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Install Helm which helps to manage Kubernetes applications. This example is based on the environment like follows.
+----------------------+ +----------------------+
| [ mgr.srv.world ] | | [ dlp.srv.world ] |
| Manager Node | | Control Plane |
+-----------+----------+ +-----------+----------+
eth0|10.0.0.25 eth0|10.0.0.30
| |
------------+--------------------------+-----------
| |
eth0|10.0.0.51 eth0|10.0.0.52
+-----------+----------+ +-----------+----------+
| [ node01.srv.world ] | | [ node02.srv.world ] |
| Worker Node#1 | | Worker Node#2 |
+----------------------+ +----------------------+
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| [1] | Install Helm. |
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[root@mgr ~]#
curl -O https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3
[root@mgr ~]#
[root@mgr ~]# bash ./get-helm-3 Downloading https://get.helm.sh/helm-v3.13.1-linux-amd64.tar.gz Verifying checksum... Done. Preparing to install helm into /usr/local/bin helm installed into /usr/local/bin/helm helm version version.BuildInfo{Version:"v3.13.1", GitCommit:"3547a4b5bf5edb5478ce352e18858d8a552a4110", GitTreeState:"clean", GoVersion:"go1.20.8"} |
| [2] | Basic Usage of Helm. |
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# search charts by words in Helm Hub [root@mgr ~]# helm search hub wordpress URL CHART VERSION APP VERSION DESCRIPTION https://artifacthub.io/packages/helm/wordpress-... 1.0.2 1.0.0 A Helm chart for deploying Wordpress+Mariadb st... https://artifacthub.io/packages/helm/kube-wordp... 0.1.0 1.1 this is my wordpress package https://artifacthub.io/packages/helm/shubham-wo... 0.1.0 1.16.0 A Helm chart for Kubernetes ..... ..... # add repository # example below is the official Helm Stable repository [root@mgr ~]# helm repo add stable https://charts.helm.sh/stable "stable" has been added to your repositories [root@mgr ~]# helm repo add bitnami https://charts.bitnami.com/bitnami "bitnami" has been added to your repositories # display added repositories [root@mgr ~]# helm repo list NAME URL stable https://charts.helm.sh/stable bitnami https://charts.bitnami.com/bitnami # search charts by words in repository [root@mgr ~]# helm search repo stable NAME CHART VERSION APP VERSION DESCRIPTION stable/acs-engine-autoscaler 2.2.2 2.1.1 DEPRECATED Scales worker nodes within agent pools stable/aerospike 0.3.5 v4.5.0.5 DEPRECATED A Helm chart for Aerospike in Kubern... stable/airflow 7.13.3 1.10.12 DEPRECATED - please use: https://github.com/air... stable/ambassador 5.3.2 0.86.1 DEPRECATED A Helm chart for Datawire Ambassador stable/anchore-engine 1.7.0 0.7.3 Anchore container analysis and policy evaluatio... stable/apm-server 2.1.7 7.0.0 DEPRECATED The server receives data from the El... stable/ark 4.2.2 0.10.2 DEPRECATED A Helm chart for ark ..... ..... # display description of a chart # helm show [all|chart|readme|values] [chart name] [root@mgr ~]# helm show chart bitnami/wordpress
annotations:
category: CMS
images: |
- name: apache-exporter
image: docker.io/bitnami/apache-exporter:1.0.2-debian-11-r10
- name: os-shell
image: docker.io/bitnami/os-shell:11-debian-11-r90
- name: wordpress
image: docker.io/bitnami/wordpress:6.3.2-debian-11-r0
licenses: Apache-2.0
apiVersion: v2
appVersion: 6.3.2
dependencies:
- condition: memcached.enabled
name: memcached
repository: oci://registry-1.docker.io/bitnamicharts
version: 6.x.x
- condition: mariadb.enabled
name: mariadb
repository: oci://registry-1.docker.io/bitnamicharts
version: 14.x.x
- name: common
repository: oci://registry-1.docker.io/bitnamicharts
tags:
- bitnami-common
version: 2.x.x
description: WordPress is the world's most popular blogging and content management
platform. Powerful yet simple, everyone from students to global corporations use
it to build beautiful, functional websites.
home: https://bitnami.com
icon: https://bitnami.com/assets/stacks/wordpress/img/wordpress-stack-220x234.png
keywords:
- application
- blog
- cms
- http
- php
- web
- wordpress
maintainers:
- name: VMware, Inc.
url: https://github.com/bitnami/charts
name: wordpress
sources:
- https://github.com/bitnami/charts/tree/main/bitnami/wordpress
version: 18.0.7
# deploy application by specified chart # helm install [any name] [chart name] [root@mgr ~]# helm install wordpress bitnami/wordpress
NAME: wordpress
LAST DEPLOYED: Fri Oct 20 15:36:37 2023
NAMESPACE: default
STATUS: deployed
REVISION: 1
TEST SUITE: None
NOTES:
CHART NAME: wordpress
CHART VERSION: 18.0.7
APP VERSION: 6.3.2
** Please be patient while the chart is being deployed **
Your WordPress site can be accessed through the following DNS name from within your cluster:
wordpress.default.svc.cluster.local (port 80)
To access your WordPress site from outside the cluster follow the steps below:
1. Get the WordPress URL by running these commands:
NOTE: It may take a few minutes for the LoadBalancer IP to be available.
Watch the status with: 'kubectl get svc --namespace default -w wordpress'
export SERVICE_IP=$(kubectl get svc --namespace default wordpress --template "{{ range (index .status.loadBalancer.ingress 0) }}{{ . }}{{ end }}")
echo "WordPress URL: http://$SERVICE_IP/"
echo "WordPress Admin URL: http://$SERVICE_IP/admin"
2. Open a browser and access WordPress using the obtained URL.
3. Login with the following credentials below to see your blog:
echo Username: user
echo Password: $(kubectl get secret --namespace default wordpress -o jsonpath="{.data.wordpress-password}" | base64 -d)
# display deployed applications [root@mgr ~]# helm list NAME NAMESPACE REVISION UPDATED STATUS CHART APP VERSION wordpress default 1 2023-10-20 15:36:37.141021313 +0900 JST deployed wordpress-18.0.7 6.3.2 # display status of a deployed apprication [root@mgr ~]# helm status wordpress NAME: wordpress LAST DEPLOYED: Fri Oct 20 15:36:37 2023 NAMESPACE: default STATUS: deployed REVISION: 1 TEST SUITE: None NOTES: CHART NAME: wordpress CHART VERSION: 18.0.7 APP VERSION: 6.3.2 ..... ..... # uninstall a deployed application [root@mgr ~]# helm uninstall wordpress release "registry" uninstalled |
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