chore: specify expose port in dockerfile

[croatialu]

What type of PR is this?

/kind improvement

What this PR does / why we need it:

When traefik is used, the host cannot be accessed to 8090 by default after being configured. Therefore, you need to configure loadbalance. The process is complicated, so specify the expose port

当使用 traefik 时， 配置完 host 后无法直接的访问到对应的服务， 需要额外的配置service， loadbalance.port 才能， 所以建议增加一个 expose port， 指定下默认的服务端口

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?

None

[CLAassistant]

All committers have signed the CLA.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[croatialu]

当前 Traefik 的配置如下

  halo:
    image: halohub/halo:2.14
    restart: on-failure:3
    container_name: halo
    depends_on:
      postgres:
        condition: service_healthy
    volumes:
      - halo:/root/.halo2
    healthcheck:
      test: ["CMD", "curl", "-f", "http://halo:8090/actuator/health/readiness"]
      interval: 30s
      timeout: 5s
      retries: 5
      start_period: 30s
    command:
      - --spring.r2dbc.url=r2dbc:pool:postgresql://postgres/halo
      - --spring.r2dbc.username=USER_NAME
      # PostgreSQL 的密码，请保证与下方 POSTGRES_PASSWORD 的变量值一致。
      - --spring.r2dbc.password=PASSWORD
      - --spring.sql.init.platform=postgresql
      # 外部访问地址，请根据实际需要修改
      # - --halo.external-url=http://example.com

    labels:
      - "traefik.http.routers.halo.rule=Host(`example.com`)"
      - "traefik.http.routers.halo.service=svc_halo"
      - "traefik.http.services.svc_halo.loadbalancer.server.port=8090"

如果指定了 Expose 后， 可以变成:

  halo:
    image: halohub/halo:2.14
    restart: on-failure:3
    container_name: halo
    depends_on:
      postgres:
        condition: service_healthy
    volumes:
      - halo:/root/.halo2
    healthcheck:
      test: ["CMD", "curl", "-f", "http://halo:8090/actuator/health/readiness"]
      interval: 30s
      timeout: 5s
      retries: 5
      start_period: 30s
    command:
      - --spring.r2dbc.url=r2dbc:pool:postgresql://postgres/halo
      - --spring.r2dbc.username=USER_NAME
      # PostgreSQL 的密码，请保证与下方 POSTGRES_PASSWORD 的变量值一致。
      - --spring.r2dbc.password=PASSWORD
      - --spring.sql.init.platform=postgresql
      # 外部访问地址，请根据实际需要修改
      # - --halo.external-url=http://example.com

    labels:
      - "traefik.http.routers.halo.rule=Host(`example.com`)"

不用关心里面具体的端口是什么，可以更直接的启动

[ruibaby]

感谢 @croatialu，这看起来会很有用，但是我这里有一个问题：目前用户可以在外挂配置文件中或者参数中（--server.port）指定运行端口，我们需要考虑这种情况吗？或者如果这样配置了其他端口之后，是否会有什么副作用。

ping @halo-dev/sig-halo

[JohnNiang]

经过手动测试，不会对当前的安装流程造成任何影响。

https://docs.docker.com/reference/dockerfile/#expose

/approve

[ruibaby]

/lgtm

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[croatialu]

感谢 @croatialu，这看起来会很有用，但是我这里有一个问题：目前用户可以在外挂配置文件中或者参数中（--server.port）指定运行端口，我们需要考虑这种情况吗？或者如果这样配置了其他端口之后，是否会有什么副作用。

ping @halo-dev/sig-halo

无影响，当手动指定其他端口后，端口映射上修改一下就行。

如果在使用traefik 情况下修改了内部的运行端口， 则需要配置traefik 的load balance，就像我上面所写的。