如何使用覆盖网络模式设置 Docker Swarm 集群

Question

我在 2 Linux 机器上创建了一个 docker swarm 集群，但是当我使用 docker-compose up -d 启动容器时，出现了一些错误。

这是我的 docker 信息：

Containers: 4
 Running: 4
 Paused: 0
 Stopped: 0
Images: 28
Server Version: swarm/1.2.5
Role: primary
Strategy: spread
Filters: health, port, containerslots, dependency, affinity, constraint
Nodes: 2
 ozcluster01: 192.168.168.41:2375
  └ ID: CKCO:JGAA:PIOM:F4PL:6TIH:EQFY:KZ6X:B64Q:HRFH:FSTT:MLJT:BJUY
  └ Status: Healthy
  └ Containers: 2 (2 Running, 0 Paused, 0 Stopped)
  └ Reserved CPUs: 0 / 2
  └ Reserved Memory: 0 B / 3.79 GiB
  └ Labels: executiondriver=native-0.2, kernelversion=3.10.0-    327.13.1.el7.x86_64, operatingsystem=CentOS Linux 7 (Core),     storagedriver=devicemapper
  └ UpdatedAt: 2016-11-04T02:05:08Z
  └ ServerVersion: 1.10.3
 ozcluster02: 192.168.168.42:2375
  └ ID: 73GR:6M7W:GMWD:D3DO:UASW:YHJ2:BTH6:DCO5:NJM6:SXPN:PXTY:3NHI
  └ Status: Healthy
  └ Containers: 2 (2 Running, 0 Paused, 0 Stopped)
  └ Reserved CPUs: 0 / 2
  └ Reserved Memory: 64 MiB / 3.79 GiB
  └ Labels: executiondriver=native-0.2, kernelversion=3.10.0-327.10.1.el7.x86_64, operatingsystem=CentOS Linux 7 (Core), storagedriver=devicemapper
  └ UpdatedAt: 2016-11-04T02:05:06Z
  └ ServerVersion: 1.10.3

这是我的docker-compose.yml

version: '2'
services:
  rabbitmq:
    image: rabbitmq
    ports:
     - "5672:5672"
     - "15672:15672"
    network_mode: "bridge"
  config-service:
    image: ozms/config-service
    ports:
     - "8888:8888"
    volumes:
     - ~/ozms/configs:/var/tmp/
     - ~/ozms/log:/log
    network_mode: "bridge"
    labels:
     - "affinity:image==ozms/config-service"
  eureka-service:
    image: ozms/eureka-service
    ports:
    - "8761:8761"
    volumes:
     - ~/ozms/log:/log
    links:
     - config-service
     - rabbitmq
    environment:
     - SPRING_RABBITMQ_HOST=rabbitmq
    network_mode: "bridge"

执行docker-compose up -d后，服务rabbitmq和config-service可以启动，但是eureka-service报错：

[dannil@ozcluster01 ozms]$ docker-compose up -d
Creating ozms_config-service_1
Creating ozms_rabbitmq_1
Creating ozms_eureka-service_1
ERROR: Unable to find a node that satisfies the following conditions 
[port 8761 (Bridge mode)]
[available container slots]
[--link=ozms_config-service_1:config-service --link=ozms_config-service_1:config-service_1 --link=ozms_config-service_1:ozms_config-service_1 --link=ozms_rabbitmq_1:ozms_rabbitmq_1 --link=ozms_rabbitmq_1:rabbitmq --link=ozms_rabbitmq_1:rabbitmq_1]

然后我执行 docker ps:

CONTAINER ID        IMAGE                 COMMAND                  CREATED             STATUS              PORTS                                                                                           NAMES
871afc8e1eb6        rabbitmq              "docker-entrypoint.sh"   2 minutes ago       Up 2 minutes        4369/tcp, 192.168.168.41:5672->5672/tcp, 5671/tcp, 25672/tcp, 192.168.168.41:15672->15672/tcp   ozcluster01/ozms_rabbitmq_1
8ef3f666a7b9        ozms/config-service   "java -Djava.security"   2 minutes ago       Up 2 minutes        192.168.168.42:8888->8888/tcp                                                                   ozcluster02/ozms_config-service_1

我发现 rabbitmq 在机器 ozculster01 上启动，配置服务在机器 ozculster02 上启动。

当docker-compose start config-service时，没有links，所以可以启动成功。但是当我在机器 ozculster02 上启动 eureka-service 时，有一个 links 到 rabbitmq，但是服务 rabbitmq 在机器 ozculster01 上，发生错误。

我该如何解决这个问题？
在 Docker Swarm 集群中使用 network_mode: "bridge" 是正确的吗？

Answer 1

我自己解决了这个问题。

在 swarm 模式下，docker 个容器无法与 network_mode:bridge 的另一个容器联系。

集群模式下，必须使用network_mode : overlay。如果您使用的是 compose-file formate 版本 2，则默认使用覆盖。

查看更多详细信息： Setting up a Docker Swarm with network overlay

使用overlay模式，docker-compose.yml文件不需要配置likns，容器可以通过${service_name_in_composeFile}[=18联系另一个容器=]

示例：

我可以进入容器 config-service 和 $ ping eureka-service，并且工作正常！

这是我写的-file.yml :

version: '2'
services:
  rabbitmq:
    image: rabbitmq
    ports:
     - "5672:5672"
     - "15672:15672"
  config-service:
    image: ozms/config-service
    ports:
     - "8888:8888"
    volumes:
     - ~/ozms/configs:/var/tmp/
     - ~/ozms/log:/log
    labels:
     - "affinity:image==ozms/config-service"
  eureka-service:
    image: ozms/eureka-service
    ports:
    - "8761:8761"
    volumes:
     - ~/ozms/log:/log
    #links:    it is no need  in overlay mode
    # - config-service
    # - rabbitmq
    environment:
     - SPRING_RABBITMQ_HOST=rabbitmq

如何使用覆盖网络模式设置 Docker Swarm 集群

How to set up a Docker Swarm cluster with overlay network mode

docker

docker-compose

docker-swarm