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k8s搭建gitlab_kubernetes部署gitlab

kubernetes部署gitlab

Gitlab官方提供了 Helm 的方式在 Kubernetes 集群中来快速安装,但是在使用的过程中发现 Helm 提供的 Chart 包中有很多其他额外的配置,所以我们这里使用自定义的方式来安装,也就是自己来定义一些资源清单文件。

Gitlab主要涉及到3个应用:Redis、Postgresql、Gitlab 核心程序,实际上我们只要将这3个应用分别启动起来,然后加上对应的配置就可以很方便的安装 Gitlab 了,我们这里选择使用的镜像不是官方的,而是 Gitlab 容器化中使用非常多的一个第三方镜像:sameersbn/gitlab,基本上和官方保持同步更新,地址:Docker GitLab by sameersbn

如果我们已经有可使用的 Redis 或 Postgresql 服务的话,那么直接配置在 Gitlab 环境变量中即可,如果没有的话就单独部署。

创建一个用于存储密码的secret文件:

创建username和password文件:
$ echo -n "admin" > ./username
$ echo -n "1f2d1e2e67df" > ./password
用kubectl生成secret对象:
$ kubectl create secret generic git-user-pass --from-file=./username --from-file=./password
secret "git-user-pass" created

创建PVC和storageclass做持久化:

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apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: gitlab-redis-pvc
  namespace: kube-ops
spec:
  selector:
    matchLabels:
      app: gitlab-redis-pv
  storageClassName: ""
  accessModes:
  - ReadWriteMany
  resources:
    requests:
      storage: 1Gi

---

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: gitlab-postgresql-pvc
  namespace: kube-ops
spec:
  selector:
    matchLabels:
      app: gitlab-postgresql-pv
  storageClassName: ""
  accessModes:
  - ReadWriteMany
  resources:
    requests:
      storage: 1Gi

---

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: gitlab-pvc
  namespace: kube-ops
spec:
  selector:
    matchLabels:
      app: gitlab-pv
  storageClassName: ""
  accessModes:
  - ReadWriteMany
  resources:
    requests:
      storage: 1Gi

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部署需要的 Redis 服务,对应的资源清单文件如下:(gitlab-redis.yaml)

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apiVersion: apps/v1
kind: Deployment
metadata:
  name: redis
  namespace: kube-ops
spec:
  selector:
    matchLabels:
      name: redis
  template:
    metadata:
      labels:
        name: redis
    spec:
      containers:
      - name: redis
        image: sameersbn/redis
        imagePullPolicy: IfNotPresent
        ports:
        - name: redis
          containerPort: 6379
        volumeMounts:
        - mountPath: /var/lib/redis
          name: data
        livenessProbe:
          exec:
            command:
            - redis-cli
            - ping
          initialDelaySeconds: 30
          timeoutSeconds: 5
        readinessProbe:
          exec:
            command:
            - redis-cli
            - ping
          initialDelaySeconds: 5
          timeoutSeconds: 1
      volumes:
      - name: data
        persistentVolumeClaim:
          claimName: gitlab-redis-pvc
---
apiVersion: v1
kind: Service
metadata:
  name: redis
  namespace: kube-ops
  labels:
    name: redis
spec:
  ports:
    - name: redis
      port: 6379
      targetPort: redis
  selector:
    name: redis

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vim gitlab-postgresql-pvc.yaml:

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apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: gitlab-postgresql-pvc
  namespace: kube-ops
spec:
  accessModes:
  - ReadWriteMany
  resources:
    requests:
      storage: 1Gi

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然后是数据库 Postgresql,对应的资源清单文件如下:(gitlab-postgresql.yaml)

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apiVersion: apps/v1
kind: Deployment
metadata:
  name: postgresql
  namespace: kube-ops
  labels:
    name: postgresql
spec:
  selector:
    matchLabels:
      name: postgresql
  template:
    metadata:
      labels:
        name: postgresql
    spec:
      containers:
      - name: postgresql
        image: sameersbn/postgresql
        imagePullPolicy: IfNotPresent
        env:
        - name: DB_USER
          value: gitlab
        - name: DB_PASS
          value: passw0rd
        - name: DB_NAME
          value: gitlab_production
        - name: DB_EXTENSION
          value: pg_trgm
        ports:
        - name: postgres
          containerPort: 5432
        volumeMounts:
        - mountPath: /var/lib/postgresql
          name: data
        livenessProbe:
          exec:
            command:
            - pg_isready
            - -h
            - localhost
            - -U
            - postgres
          initialDelaySeconds: 30
          timeoutSeconds: 5
        readinessProbe:
          exec:
            command:
            - pg_isready
            - -h
            - localhost
            - -U
            - postgres
          initialDelaySeconds: 5
          timeoutSeconds: 1
      volumes:
      - name: data
        persistentVolumeClaim:
          claimName: gitlab-postgresql-pvc
---
apiVersion: v1
kind: Service
metadata:
  name: postgresql
  namespace: kube-ops
  labels:
    name: postgresql
spec:
  ports:
    - name: postgres
      port: 5432
      targetPort: postgres
  selector:
    name: postgresql

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vim gitlab-pvc.yaml

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apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: gitlab-pvc
  namespace: kube-ops
spec:
  accessModes:
  - ReadWriteMany
  resources:
    requests:
      storage: 1Gi

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然后就是我们最核心的 Gitlab 的应用,对应的资源清单文件如下:(gitlab.yaml)

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apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: gitlab
  namespace: kube-ops
spec:
  selector:
    matchLabels:
      name: gitlab
  template:
    metadata:
      labels:
        name: gitlab
    spec:
      containers:
      - name: gitlab
        image: sameersbn/gitlab:12.1.6
        imagePullPolicy: IfNotPresent
        env:
        - name: TZ
          value: Asia/Shanghai
        - name: GITLAB_TIMEZONE
          value: Beijing
        - name: GITLAB_SECRETS_DB_KEY_BASE
          value: long-and-random-alpha-numeric-string
        - name: GITLAB_SECRETS_SECRET_KEY_BASE
          value: long-and-random-alpha-numeric-string
        - name: GITLAB_SECRETS_OTP_KEY_BASE
          value: long-and-random-alpha-numeric-string
        - name: GITLAB_ROOT_PASSWORD
          valueFrom:
            secretKeyRef:
              name: git-user-pass
              key: password
          # value: admin321
        - name: GITLAB_ROOT_EMAIL
          value: 1369472116@qq.com
        - name: GITLAB_HOST
          value: gitlab.fuyuteng.com
        - name: GITLAB_PORT
          value: "80"
        - name: GITLAB_SSH_PORT
          value: "30022"
        - name: GITLAB_NOTIFY_ON_BROKEN_BUILDS
          value: "true"
        - name: GITLAB_NOTIFY_PUSHER
          value: "false"
        - name: GITLAB_BACKUP_SCHEDULE
          value: daily
        - name: GITLAB_BACKUP_TIME
          value: 01:00
        - name: DB_TYPE
          value: postgres
        - name: DB_HOST
          value: postgresql
        - name: DB_PORT
          value: "5432"
        - name: DB_USER
          value: gitlab
        - name: DB_PASS
          value: passw0rd
        - name: DB_NAME
          value: gitlab_production
        - name: REDIS_HOST
          value: redis
        - name: REDIS_PORT
          value: "6379"
        ports:
        - name: http
          containerPort: 80
        - name: ssh
          containerPort: 22
        volumeMounts:
        - mountPath: /home/git/data
          name: data
        livenessProbe:
          httpGet:
            path: /
            port: 80
          initialDelaySeconds: 180
          timeoutSeconds: 5
        readinessProbe:
          httpGet:
            path: /
            port: 80
          initialDelaySeconds: 5
          timeoutSeconds: 1
      volumes:
      - name: data
        persistentVolumeClaim:
          claimName: gitlab-pvc
---
apiVersion: v1
kind: Service
metadata:
  name: gitlab
  namespace: kube-ops
  labels:
    name: gitlab
spec:
  ports:
    - name: http
      port: 80
      targetPort: http
    - name: ssh
      port: 22
      targetPort: ssh
      nodePort: 30022
  type: NodePort
  selector:
    name: gitlab

---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: gitlab
  namespace: kube-ops
  annotations:
    kubernetes.io/ingress.class: traefik
spec:
  rules:
  - host: gitlab.fuyuteng.com
    http:
      paths:
      - backend:
          serviceName: gitlab
          servicePort: http

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我们这里应用数据都做数据持久化,还有敏感数据用了secret引入到环境变量,比如添加 PV/PVC 或者 StorageClass。

要注意的是其中 Redis 和 Postgresql 相关的环境变量配置,另外,我们这里添加了一个 Ingress 对象,来为我们的 Gitlab 配置一个域名git.qikqiak.com,这样应用部署完成后,我们就可以通过该域名来访问了,然后直接部署即可:

$ kubectl create -f gitlab-redis.yaml gitlab-postgresql.yaml gitlab.yaml

创建完成后,查看 Pod 的部署状态:

  1. $ kubectl get pods -n kube-ops
  2. NAME READY STATUS RESTARTS AGE
  3. gitlab-7d855554cb-twh7c 1/1 Running 0 10m
  4. postgresql-8566bb959c-2tnvr 1/1 Running 0 17h
  5. redis-8446f57bdf-4v62p 1/1 Running 0 17h

可以看到都已经部署成功了,然后我们可以通过 Ingress 中定义的域名git.qikqiak.com(需要做 DNS 解析或者在本地 /etc/hosts 中添加映射)来访问 Portal:

gitlab portalgitlab portal

使用用户名 root,和部署的时候指定的超级用户密码GITLAB_ROOT_PASSWORD=admin321即可登录进入到首页:

gitlab homepagegitlab homepage

Gitlab 运行后,我们可以注册为新用户并创建一个项目,还可以做很多的其他系统设置,比如设置语言、设置应用风格样式等等。

点击Create a project创建一个新的项目,和之前 Github 使用上没有多大的差别:

create gitlab projectcreate gitlab project

创建完成后,我们可以添加本地用户的一个SSH-KEY,这样我们就可以通过 SSH 来拉取或者推送代码了。SSH 公钥通常包含在~/.ssh/id_rsa.pub 文件中,并以ssh-rsa开头。如果没有的话可以使用ssh-keygen命令来生成,id_rsa.pub里面的内容就是我们需要的 SSH 公钥,然后添加到 Gitlab 中。

由于平时使用的 ssh 默认是 22 端口,现在如果用默认的 22 端口去连接,是没办法和 Gitlab 容器中的 22 端口进行映射的,因为我们只是通过 Service 的 22 端口进行了映射,要想通过节点去进行 ssh 链接就需要在节点上一个端口和容器内部的22端口进行绑定,所以这里我们可以通过 NodePort 去映射 Gitlab 容器内部的22端口,比如我们将环境变量设置为GITLAB_SSH_PORT=30022,将 Gitlab 的 Service 也设置为 NodePort 类型:

  1. apiVersion: v1
  2. kind: Service
  3. metadata:
  4. name: gitlab
  5. namespace: kube-ops
  6. labels:
  7. name: gitlab
  8. spec:
  9. ports:
  10. - name: http
  11. port: 80
  12. targetPort: http
  13. - name: ssh
  14. port: 22
  15. targetPort: ssh
  16. nodePort: 30022
  17. type: NodePort
  18. selector:
  19. name: gitlab

注意上面 ssh 对应的 nodePort 端口设置为 30022,这样就不会随机生成了,重新更新下 Deployment 和 Service,更新完成后,现在我们在项目上面 Clone 的时候使用 ssh 就会带上端口号了:

gitlab sshgitlab ssh

现在就可以使用Clone with SSH的地址了,由于上面我们配置了 SSH 公钥,所以就可以直接访问上面的仓库了:

  1. $ git clone ssh://git@git.qikqiak.com:30022/root/gitlab-demo.git
  2. Cloning into 'gitlab-demo'...
  3. warning: You appear to have cloned an empty repository.
  4. Checking connectivity... done.

然后随便在该项目下面添加一些资源:

  1. $ echo "# hello world" > README.md
  2. $ git add .
  3. $ git commit -m 'hello world'
  4. [master (root-commit) 63de7cb] hello world
  5. 1 file changed, 1 insertion(+)
  6. create mode 100644 README.md
  7. $ git push origin master
  8. Counting objects: 3, done.
  9. Writing objects: 100% (3/3), 224 bytes | 0 bytes/s, done.
  10. Total 3 (delta 0), reused 0 (delta 0)
  11. To ssh://git@git.qikqiak.com:30022/root/gitlab-demo.git
  12. * [new branch] master -> master

然后刷新浏览器,就可以看到刚刚创建的 Git 仓库中多了一个 README.md 的文件:

git commit

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