Uchechukwu Onyekwuluje's Knowledge & Brain Dumps

Helm Repository

Helm is a package manager for kubernetes. You can manage your applications using Helm. Helm accomplishes this by using charts, templates, values. Upon initialization, you have predefined configs to use. While it’s possible using package and artifact managers like Artifactory, Nexus, GitHub, GitLab etc it’s also nice to have a better feel for the building blocks on a bare server.

Requirements

For this server, we will be using Linux

Packages

Install the following packages on the server

yum install -y sysstat unzip gcc kernel-devel kernel-headers dnf-plugins-core python3-pip \
device-mapper-persistent-data lvm2 libxml2 libxml2-devel libxslt libxslt-devel wget libffi-devel \
openssl-devel make openssl-devel bzip2-devel vim nc yum-utils runc net-tools epel-release httpd-tools

yum groupinstall -y "Development Tools"
yum install -y nginx

NOTE: Make package changes as needed. Your must haves are nginx, httpd-tools and epel-release

Storage

We will be using the primary partion. I’ll create a folder

sudo mkdir -p /data/helm/charts

NOTE: Configure folder permissions as needed. I am making it world accessible

Setup Basic Auth

Setup basic auth for our test helm chart

mkdir -p /data/helm/charts/appnginx
chmod 7777 /data/helm/charts/appnginx
htpasswd -c /data/helm/charts/appnginx/.htpasswd admin     [admin/password]

Update Nginx

Create a new location and update nginx in /etc/nginx/nginx.conf

 location /appnginx {
    root /data/helm/charts;
    auth_basic "Helm Login";
    auth_basic_user_file /data/helm/charts/appnginx/.htpasswd;
    dav_methods  PUT DELETE MKCOL COPY MOVE;
    create_full_put_path   on;
    dav_access             group:rw  all:r;
    client_max_body_size 10000m;
    autoindex on;
    allow all;
 }

Stop and restart nginx. Test to ensure you can login with the credentials

sudo systemctl stop nginx
sudo systemctl start nginx

# Test
http://<server_name>/appnginx/

Create Custom Nginx Package

Create chart directory

helm create appnginx

change directory cd appnginx and update as needed. In our case, we want something basic

rm -Rf *
mkdir template

bash -c 'cat <<EOF> Chart.yaml
apiVersion: v2
name: appnginx
description: Nginx 1.16.1 Helm Chart
type: application
version: 0.1.0
appVersion: "1.1.1"
EOF'

bash -c 'cat <<EOF> values.yaml 
namespace: nginx

replicaCount: 4

image:
  repository: "nginx"
  pullPolicy: "IfNotPresent"
  tag: "1.16.1"

imagePullSecrets: []
nameOverride: "nginx-app"
fullnameOverride: "nginx-chart"
EOF'


bash -c 'cat <<EOF> templates/namespace.yaml 
---
apiVersion: v1
kind: Namespace
metadata:
  name: 
EOF'

bash -c 'cat <<EOF> templates/deployment.yaml 
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: -deployment
  namespace: 
spec:
  selector:
    matchLabels:
      app: 
  replicas: 
  template:
    metadata:
      labels:
        app: 
    spec:
      containers:
      - name: 
        image: ":"
        imagePullPolicy: 
        ports:
        - containerPort: 80

---
apiVersion: v1
kind: Service
metadata:
  name: -service
  namespace: 
  labels: 
    app: 
spec:
  ports:
  - port: 80
    protocol: TCP
  selector:
    app:  
EOF'

Create Package

cd ../
helm package appnginx/

Initialize

mv appnginx-0.0.1.tgz appnginx/
helm repo index appnginx --url http://192.168.1.32/appnginx

Publish Chart

curl -u admin:password -T appnginx/index.yaml http://192.168.1.32/appnginx/
curl -u admin:password -T appnginx/appnginx-0.0.1.tgz http://192.168.1.32/appnginx/

Add Helm Repository

helm repo add appnginx http://192.168.1.32/appnginx/ --username admin --password password

Install Package

helm install appnginx appnginx/appnginx

List helm list

NAME        NAMESPACE   REVISION    UPDATED                                 STATUS      CHART           APP VERSION
appnginx    default     2           2022-05-10 05:16:24.19386226 -0400 EDT  deployed    appnginx-0.0.1  1.1.0

Delete Chart helm delete appnginx