简介

GitLab社区版是免费的，和github不同，他可以免费的建立私有仓库，非常适合我们的项目开发。
为了组内的CI/CD工作，现在需要部署一个gitlab来做代码仓库。

部署

假设读者已经有一个kubernetes集群了，我这里是ocp(openshift container platform)。
gitlab官网用的是helm安装，都是chart的形式，为了方便起见，我们直接用命令行 apply yaml来部署，从IBM的sample下载的yaml，在自己的环境中部署会有问题，我修改了，下面直接把yaml贴出来。
redis.yaml:

---
apiVersion: v1
kind: Service
metadata:
  name: redis
  labels:
    app: gitlab
spec:
  ports:
    - port: 6379
      targetPort: 6379
  selector:
    app: gitlab
    tier: backend
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: redis-claim
  labels:
    app: gitlab
spec:
  storageClassName: gluster-dyn
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 2Gi
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: redis
  labels:
    app: gitlab
spec:
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: gitlab
        tier: backend
    spec:
      containers:
        - image: redis:3.0.7-alpine
          name: redis
          ports:
            - containerPort: 6379
              name: redis
          volumeMounts:
            - name: redis
              mountPath: /data
      volumes:
        - name: redis
          persistentVolumeClaim:
            claimName: redis-claim

postgers.yaml

---
apiVersion: v1
kind: Service
metadata:
  name: postgresql
  labels:
    app: gitlab
spec:
  ports:
    - port: 5432
  selector:
    app: gitlab
    tier: postgreSQL
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: postgres-claim
  labels:
    app: gitlab
spec:
  storageClassName: gluster-dyn
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 2Gi
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: postgresql
  labels:
    app: gitlab
spec:
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: gitlab
        tier: postgreSQL
    spec:
      containers:
        - image: postgres:9.6.2-alpine
          name: postgresql
          env:
            - name: POSTGRES_USER
              value: gitlab
            - name: POSTGRES_DB
              value: gitlabhq_production
            - name: POSTGRES_PASSWORD
              value: gitlab
          ports:
            - containerPort: 5432
              name: postgresql
          volumeMounts:
            - name: postgresql
              mountPath: /var/lib/postgresql/data
              subPath: postgres
      volumes:
        - name: postgresql
          persistentVolumeClaim:
            claimName: postgres-claim

gitlab.yaml:

---
apiVersion: v1
kind: Service
metadata:
  name: gitlab
  labels:
    app: gitlab
spec:
  ports:
    - name: gitlab-ui
      port: 80
      protocol: TCP
      targetPort: 30080
    - name: gitlab-ssh
      port: 22
      protocol: TCP
      targetPort: 22
  selector:
    app: gitlab
    tier: frontend
  type: ClusterIP
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: gitlab-claim
  labels:
    app: gitlab
spec:
  storageClassName: gluster-dyn
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 5Gi
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: gitlab
  labels:
    app: gitlab
spec:
  strategy:
    type: Recreate
  template:
    metadata:
      labels:
        app: gitlab
        tier: frontend
    spec:
      containers:
        - image: gitlab/gitlab-ce:9.1.0-ce.0
          name: gitlab
          env:
            - name: GITLAB_OMNIBUS_CONFIG
              value: |
                postgresql['enable'] = false
                gitlab_rails['db_username'] = "gitlab"
                gitlab_rails['db_password'] = "gitlab"
                gitlab_rails['db_host'] = "postgresql"
                gitlab_rails['db_port'] = "5432"
                gitlab_rails['db_database'] = "gitlabhq_production"
                gitlab_rails['db_adapter'] = 'postgresql'
                gitlab_rails['db_encoding'] = 'utf8'
                redis['enable'] = false
                gitlab_rails['redis_host'] = 'redis'
                gitlab_rails['redis_port'] = '6379'
                gitlab_rails['gitlab_shell_ssh_port'] = 30022
                external_url 'http://gitlab.example.com:30080'
          ports:
            - containerPort: 30080
              name: gitlab
          volumeMounts:
            - name: gitlab
              mountPath: /var/opt/gitlab
              subPath: gitlab_data
            - name: gitlab
              mountPath: /etc/gitlab
              subPath: gitlab_configuration
      volumes:
        - name: gitlab
          persistentVolumeClaim:
            claimName: gitlab-claim

下载的yaml部署后，postgres起不来，遇到下面的问题：

[root@localhost ~]# kubectl logs postgresql-778895955c-vqtgx 
The files belonging to this database system will be owned by user "postgres".
This user must also own the server process.
The database cluster will be initialized with locale "en_US.utf8".
The default database encoding has accordingly been set to "UTF8".
The default text search configuration will be set to "english".
Data page checksums are disabled.
initdb: directory "/var/lib/postgresql/data" exists but is not empty
It contains a dot-prefixed/invisible file, perhaps due to it being a mount point.
Using a mount point directly as the data directory is not recommended.
Create a subdirectory under the mount point.

stackoverflow已经给出了答案：

Error you get is because you want to use root folder of mounted volume `/` as postgresql Data dir 
and postgresql complains that it is not best practice to do so since it is not empty and contains already some data inside 
(namely `lost+found` directory).

It is far better to locate data dir in separate empty subfolder 
(`/postgres` for example) and give postgresql clean slate when creating its file structure. 
You didn't get same thing on minicube since you most probably mounted host folder that didn't have anything inside (was empty) and didn't trigger such a complaint.

To do so, you would need initially empty [subPath](https://kubernetes.io/docs/concepts/storage/volumes/#using-subpath) 
of your volume (empty `/postgres` subfolder on your PV for example) 
mounted to appropriate mount point (`/var/lib/posgresql/data`) in your pod. 
Note that you can name subPath and mount point end folder the same name, 
they are different here just as an example where `test-db-volume/postgres` folder 
would be mounted on pod to `/var/lib/postgresql/data` folder:
...
volumeMounts:
- mountPath: /var/lib/postgresql/data
  name: test-db-volume
  subPath: postgres
...

部署后，我们再部署一个相应的ingress：
gitlab-ingress.yaml:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: gitlab-ingress
spec:
  rules:
  - host: gitlab.mine.com
    http:
      paths:
      - backend:
          serviceName: gitlab
          servicePort: 80

在pc上修改hosts：

x.x.x.x gitlab.mine.com

就可以通过浏览器http://gitlab.mine.com访问了，默认用户名密码：root，root。
登录后提示修改默认密码。

待续...