PangYeon`s IT Log

간단하게 인증서 설정없이 Docker Private Registry를 k8s에 설치하는 방법이다. 설치 후 UI 적용할 예정.

1. id, password 생성 (굳이 안 해도 됨)

 nerdctl run --entrypoint htpasswd   httpd:2 -Bbn testuser testpassword > auth/htpasswd

2. namespace 생성 및 secret 생성

$ kubectl create ns registry
$ kubectl create secret generic registry-auth --from-file=idpass=./htpasswd -n registry

3. pv, pvc, deployment, service 생성

storageclass가 없을 경우 pv를 생성하고 workernode에 registry폴더를 생성한다.(해당 경로는 적절히 수정해서 사용하면 됨)

1번에 id, password 생성 하지 않았으면, deployment 내 registry-auth 부분들 삭제하고 진행

아래 yaml 생성 후 kubectl apply -f registry.yaml -n registry 명령어 실행

$ vi registry.yaml
$ kubectl apply -f registry.yaml -n registry

apiVersion: v1
kind: PersistentVolume
metadata:
  name: registry-pv
  labels:
    reg: registry
spec:
  capacity:
    storage: 10Gi
  accessModes:
  - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  hostPath:
    path: "/root/registry"
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: registry-pvc
  labels:
    reg: registry
spec:
  accessModes:
  - ReadWriteOnce
  resources:
    requests:
      storage: 10Gi
  selector:
    matchLabels:
      reg: registry
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: registry
  labels:
    reg: registry
spec:
  replicas: 1
  selector:
    matchLabels:
      reg: registry
  template:
    metadata:
      labels:
        reg: registry
    spec:
      containers:
      - name: registry
        image: registry:2
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 5000
        volumeMounts:
        - name: registry-auth
          mountPath: /auth # 이미지 내 기본 registry auth 경로
        - name: registry-data
          mountPath: /var/lib/registry
        env:
        - name: REGISTRY_AUTH_HTPASSWD_PATH # 기본 설정
          value: /auth/idpass # secert에 들어가는 파일을 idpass로 생성
        - name: REGISTRY_AUTH_HTPASSWD_REALM # 기본 설정
          value: "Registry Realm"
        - name: REGISTRY_STORAGE_DELETE_ENABLED
          value: "true"
      volumes:
      - name: registry-auth
        secret:
          secretName: registry-auth
      - name: registry-data
        persistentVolumeClaim:
          claimName: registry-pvc
---
apiVersion: v1
kind: Service
metadata:
  name: registry
spec:
  type: NodePort
  ports:
    - port: 5000
      targetPort: 5000
      nodePort: 30050
      protocol: TCP
  selector:
    reg: registry

4. 테스트

curl localhost:30050/v2/_catalog -u "testuser:testpassword"

5. UI 적용 (UI가 굳이 필요없으면 안 해도 됨)

UI 는 아래 오픈소스를 사용할 예정이다.

https://github.com/Joxit/docker-registry-ui

우선 위에 생성한 registry 에 ingress 를 등록해야한다. (Domain이 일치해야 UI에서 인증을 사용할 수 있음.)

$ vi registry-ingress.yaml
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: registry
  nginx.ingress.kubernetes.io/proxy-body-size: 4096m # 이미지 업로드 용량으로 반드시 설정필요하며 필요에 따라 설정
spec:
  ingressClassName: nginx
  rules:
  - host: registry.wky.kr
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: registry
            port:
              number: 5000

또한, 위에 생성한 Deployment에 환경변수를 추가해야한다.

  $ kubectl edit deploy -n registry registry
  ...
      - env:
        - name: REGISTRY_HTTP_HEADERS_Access-Control-Allow-Origin # 추가
          value: '[http://registry-ui.wky.kr:30080]'
        - name: REGISTRY_HTTP_HEADERS_Access-Control-Allow-Methods # 추가
          value: '[HEAD,GET,OPTIONS,DELETE]'
        - name: REGISTRY_HTTP_HEADERS_Access-Control-Allow-Credentials # 추가
          value: '[true]'
        - name: REGISTRY_HTTP_HEADERS_Access-Control-Allow-Headers # 추가
          value: '[Authorization,Accept]'
        - name: REGISTRY_HTTP_HEADERS_Access-Control-Expose-Headers # 추가
          value: '[Docker-Content-Digest]'
        - name: REGISTRY_STORAGE_DELETE_ENABLED
          value: "true"
        - name: REGISTRY_AUTH_HTPASSWD_PATH
          value: /auth/idpass
        - name: REGISTRY_AUTH_HTPASSWD_REALM
          value: Registry Realm     
  ...

UI 설치

특히 아래 yaml의 NGINX_PROXY_PASS_URL은 k8s service domain을 넣거나 nodeport를 넣거나 ingress를 넣어주면된다.

$ vi registry-ui.yaml
$ kubectl apply -f registry-ui -n registry

apiVersion: apps/v1
kind: Deployment
metadata:
  name: registry-ui
  labels:
    reg: registry-ui
spec:
  replicas: 1
  selector:
    matchLabels:
      reg: registry-ui
  template:
    metadata:
      labels:
        reg: registry-ui
    spec:
      containers:
      - name: registry-ui
        image: joxit/docker-registry-ui:main
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 80
        env:
        - name: SINGLE_REGISTRY
          value: "true"
        - name: REGISTRY_TITLE
          value: Docker Registry UI
        - name: DELETE_IMAGES
          value: "true"
        - name: SHOW_CONTENT_DIGEST
          value: "true"
        - name: SHOW_CATALOG_NB_TAGS
          value: "true"
        - name: CATALOG_MIN_BRANCHES
          value: "1"
        - name: CATALOG_MAX_BRANCHES
          value: "1"
        - name: TAGLIST_PAGE_SIZE
          value: "100"
        - name: REGISTRY_SECURED
          value: "true"
        - name: CATALOG_ELEMENTS_LIMIT
          value: "1000"
        - name: NGINX_PROXY_PASS_URL
          value: http://registry.registry:5000 #  http://registry.wky.kr:30050 또는 http://registry.wky.kr:30080
        - name: REGISTRY_SECURED
          value: "true"
---
apiVersion: v1
kind: Service
metadata:
  name: registry-ui
spec:
  type: NodePort
  ports:
    - port: 80
      targetPort: 80
      nodePort: 30051
      protocol: TCP
  selector:
    reg: registry-ui
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: registry-ui
spec:
  ingressClassName: nginx
  rules:
  - host: registry-ui.wky.kr
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: registry-ui
            port:
              number: 80

결과 확인

기타 : https 로 여는법

사설 인증서를 생성하고, 사설인증서이기 때문에 해당 registry를 실제 사용할 서버를 위해 ca파일도 생성한다.

# 사설 인증서 생성
$ openssl req -newkey rsa:4096 -nodes -sha256 -keyout domain.key -subj "/CN=registry.wky.kr" -addext "subjectAltName=DNS:registry.wky.kr" -x509 -days 365 -out domain.crt

# 이미지 push 또는 pull 위한 ca 파일 생성
$ cat domain.crt domain.key > domain.pem

registry에 마운트할 secret과 ingress에 등록할 secert 2개를 생성한다.

# registry 인증서용
$ kubectl create secret generic https-registry --from-file=domain.crt=./domain.crt --from-file=domain.key=./domain.key -n registry
 
# registry ingress용
$ kubectl create secret tls tls-registry --key ./domain.key --cert ./domain.crt -n registry

deployment와 service, ingress 수정

# deployment
apiVersion: apps/v1
kind: Deployment
metadata:
  name: registry
  labels:
    reg: registry
spec:
  replicas: 1
  selector:
    matchLabels:
      reg: registry
  template:
    metadata:
      labels:
        reg: registry
    spec:
      containers:
      - name: registry
        image: registry:2
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 443 # 443으로 수정
        volumeMounts:
        - name: registry-auth
          mountPath: /auth 
        - name: registry-data
          mountPath: /var/lib/registry
        - name: https-registry # 인증서파일 마운트
          mountPath: /tmp
        env:
        - name: REGISTRY_HTTP_HEADERS_Access-Control-Allow-Origin
          value: '[http://registry-ui.wky.kr:30080]'
        - name: REGISTRY_HTTP_HEADERS_Access-Control-Allow-Methods 
          value: '[HEAD,GET,OPTIONS,DELETE]'
        - name: REGISTRY_HTTP_HEADERS_Access-Control-Allow-Credentials 
          value: '[true]'
        - name: REGISTRY_HTTP_HEADERS_Access-Control-Allow-Headers
          value: '[Authorization,Accept]'
        - name: REGISTRY_HTTP_HEADERS_Access-Control-Expose-Headers 
          value: '[Docker-Content-Digest]'
        - name: REGISTRY_STORAGE_DELETE_ENABLED
          value: "true"
        - name: REGISTRY_AUTH_HTPASSWD_PATH
          value: /auth/idpass
        - name: REGISTRY_AUTH_HTPASSWD_REALM
          value: Registry Realm     
        - name: REGISTRY_STORAGE_DELETE_ENABLED
          value: "true"
        - nmae: REGISTRY_HTTP_TLS_CERTIFICATE # 인증서 설정
          value: /tmp/domain.crt
        - name: REGISTRY_HTTP_TLS_KEY  # 인증서 설정
          value: /tmp/domain.key
        - name: REGISTRY_HTTP_ADDR # 443으로 포트 열기
          value: 0.0.0.0:443
      volumes:
      - name: registry-auth
        secret:
          secretName: registry-auth
      - name: registry-data
        persistentVolumeClaim:
          claimName: registry-pvc
      - name: https-registry # 인증서 secret 마운트
        secret:
          secretName: https-registry
 
# serivce 
apiVersion: v1
kind: Service
metadata:
  name: registry
spec:
  type: ClusterIP # NodePort도 관계없음.
  ports:
    - port: 443 # 443으로 수정
      targetPort: 443  # 443으로 수정
      protocol: TCP
  selector:
    reg: registry
    
# ingress
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: registry
  nginx.ingress.kubernetes.io/backend-protocol: HTTPS # HTTPS 통신
  nginx.ingress.kubernetes.io/proxy-body-size: 4096m 
spec:
  ingressClassName: nginx
  rules:
  - host: registry.wky.kr
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: registry
            port:
              number: 443
  tls: # tls secret 마운트
  - hosts:
    - registry.wky.kr
  secretName: tls-registry

참고 : 

https://distribution.github.io/distribution/

https://github.com/Joxit/docker-registry-ui