[K8S] Elasticsearch를 Helm Chart + Kustomize로 배포

• Helm과 k8s(또는 k3s)가 설치 된 이후에 아래 내용 수행 가능

1. Helm Chart 만으로 배포

• helm chart 만 사용하여 Elasticsearch를 배포하는 방법

1. helm chart repo add (예시는 bitnami의 chart를 사용합니다.)

   #repo 추가
   $ helm repo add bitnami https://charts.bitnami.com/bitnami
   "bitnami" has been added to your repositories
   
   #repo list 조회
   $ helm search repo bitnami
   NAME                                            CHART VERSION   APP VERSION     DESCRIPTION
   bitnami/airflow                                 16.2.1          2.8.0           Apache Airflow is a tool to express and execute...
   bitnami/apache                                  10.3.1          2.4.58          Apache HTTP Server is an open-source HTTP serve...
   bitnami/apisix                                  2.4.3           3.7.0           Apache APISIX is high-performance, real-time AP...
   bitnami/appsmith                                2.2.1           1.9.60          Appsmith is an open source platform for buildin...
   bitnami/argo-cd                                 5.4.4           2.9.4           Argo CD is a continuous delivery tool for Kuber...
   bitnami/argo-workflows                          6.2.1           3.5.1           Argo Workflows is meant to orchestrate Kubernet...
   bitnami/aspnet-core                             5.2.1           8.0.1           ASP.NET Core is an open-source framework for we...
   ...

2. 실행 yaml 생성

   $ helm template es bitnami/elasticsearch > es.yaml

3. kubectl apply 로 배포

   $ kubectl apply -f es.yaml -n elastic

1)설정 내용을 변경하여 배포

1. 변경 내용 yaml 작성

   #values.yaml
   master:
     masterOnly: false
     replicaCount: 3

2. 변경 내용을 사용하여 새로운 실행 yaml 생성

   $ helm template es bitnami/elasticsearch -f values.yaml > es_edit.yaml

3. 새로운 yaml로 배포

   $ kubectl apply -f es_edit.yaml -n elastic

2. Kustomize + Helm Chart 배포

• kustomize와 helm을 같이 사용하여 Elasticsearch를 배포하는 방법

1. kustomization.yaml 작성

   helmCharts:
     - name: elastic
       repo: https://charts.bitnami.com/bitnami
       version: 19.13.14
       releaseName: es
       namespace: elastic
       valuesFile: values.yaml

2. 변경 내용 yaml 작성

   #values.yaml
   master:
     masterOnly: false
     replicaCount: 3

3. 변경 내용을 적용한 배포용 yaml 생성

   $ kustomize build . --enable-helm > temp.yaml

4. 배포

   $ kubectl apply -f temp.yaml -n elastic

3. 다수의 Helm Chart 동시 배포

• 여러개의 helm chart를 동시에 배포하는 방법

1. kustomization.yaml 작성

   #/helm/elasticsearch/kustomization.yaml
   helmCharts:
     - name: elastic
       repo: https://charts.bitnami.com/bitnami
       version: 19.13.14
       releaseName: es
       namespace: elastic
       valuesFile: values.yaml
   
   #/helm/postgresql/kustomization.yaml
   helmCharts:
     - name: postgre
       repo: https://charts.bitnami.com/bitnami
       version: 13.2.25
       releaseName: postgre
       namespace: elastic
       valuesFile: values.yaml
   #/helm/kustomization.yaml
   bases:
     - es
     - postgre
   

2. 배포용 yaml 생성

   #/helm
   $ kustomize build . --enable-helm > temp.yaml

3. 배포

   $ kubectl apply -f temp.yaml -n elastic