zhmg23

ubuntu14.04下docker swarm集群的搭建并验证overlay跨主机网络通信

1、安装说明

操作系统：Ubuntu 14.04 LTS

测试环境：2台虚拟机，IP分别为192.168.85.155/157

swarm manager: 192.168.85.155 swarm集群的管理机, 简称管理机

swarm node1: 192.168.85.155 swarm集群的节点机1, 简称节点1，主机名：udocker01

swarm node2: 192.168.85.157 swarm集群的节点机2, 简称节点2，主机名：udocker03

注意: 必须确保节点机的hostname不相同。

Docker Swarm工作原理

Docker Swarm使用cli.go（https://github.com/codegangsta/cli）作为CLI的框架开发Swarm CLI，目前支持4个子命令：

Create – 向Docker Hub服务发现服务器申请一个全球唯一的token标识此集群

List – 列举当前集群的所有节点

Join – 加入一个集群

Manage – 管理一个集群

2、初始化swarm集群，创建管理节点

# docker swarm init --listen-addr 192.168.85.155:2377

Swarm initialized: current node (cnyyivx55xgydeuc7brd3tsd9) is now a manager.

To add a worker to this swarm, run the following command:

    docker swarm join \

    --token SWMTKN-1-0e266os2zpywu0x78t05yqlle4hcy1xrr9r20boghvih6joc59-e6eaut3wc2ycrxpfyhnt957zw \

    192.168.85.155:2377

To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.

--listen-addr指定监听的ip与端口

 

查看结果

# docker node ls

3、把节点2添加到swarm集群

在udocker03上执行操作

#  docker swarm join --token SWMTKN-1-0e266os2zpywu0x78t05yqlle4hcy1xrr9r20boghvih6joc59-e6eaut3wc2ycrxpfyhnt957zw  192.168.85.155:2377

注：如果不加上 --token SWMTKN-1-0e266os2zpywu0x78t05yqlle4hcy1xrr9r20boghvih6joc59-e6eaut3wc2ycrxpfyhnt957zw ,会报错：Error response from daemon: rpc error: code = 3 desc = A valid join token is necessary to join this cluster

到节点1上，查看添加结果

# docker node ls

ID                           HOSTNAME   STATUS  AVAILABILITY  MANAGER STATUS

avnp4j9domfznqg6h4kfsgige    udocker03  Ready   Active        

cnyyivx55xgydeuc7brd3tsd9 *  udocker01  Ready   Active        Leader

 

4、创建一个overlay 跨主机网络

4.1 先查看原有网络

# docker network ls

NETWORK ID          NAME                DRIVER              SCOPE

9ef2e25b796c        bridge              bridge              local               

dd5975e2146c        deploy_default      bridge              local               

94ecadd78224        docker_gwbridge     bridge              local               

42f8a2c775b6        host                host                local               

7yqnnxtm87mw        ingress             overlay             swarm               

0597476b0bcf        none                null                local          

4.2 创建一个新的overlay网络

# docker network create --driver overlay docker-nethlg

d0qvi5993lgdg4c2szp9rh4kq

#  docker network ls

NETWORK ID          NAME                DRIVER              SCOPE

9ef2e25b796c        bridge              bridge              local               

dd5975e2146c        deploy_default      bridge              local               

d0qvi5993lgd        docker-nethlg       overlay             swarm               

94ecadd78224        docker_gwbridge     bridge              local               

42f8a2c775b6        host                host                local               

7yqnnxtm87mw        ingress             overlay             swarm               

0597476b0bcf        none                null                local    

 

4.3 在新的跨主机overlay 网络(docker-nethlg)上创建应用

# docker service create --replicas 2 --name helloworld --network=docker-nethlg  alpine ping docker.com

aoeoclf85dtsxo5q2hiujxvgq

 

4.4 查看部署结果

# docker service ls

ID            NAME        REPLICAS  IMAGE   COMMAND

aoeoclf85dts  helloworld  2/2       alpine  ping docker.com

# docker service ps helloworld

ID                         NAME              IMAGE   NODE       DESIRED STATE  CURRENT STATE                    ERROR

atf4jxs9k9tewnjiisa8bxll7  helloworld.1      alpine  udocker01  Running        Running 13 minutes ago           

2q1f6mx8l5lmk0hk42ala5d5v  helloworld.2      alpine  udocker03  Running        Running less than a second ago   

5py2lcuy6o5p944twe2rdu1h6   \_ helloworld.2  alpine  udocker03  Shutdown       Rejected less than a second ago  "No such image: alpine:latest"

cqddi64bwyiakfr8azrzcvu0i   \_ helloworld.2  alpine  udocker03  Shutdown       Rejected less than a second ago  "No such image: alpine:latest"

8awxp109kwvj823x0rjlvqjaq   \_ helloworld.2  alpine  udocker03  Shutdown       Rejected less than a second ago  "No such image: alpine:latest"

3twgl1dydh9chfgii4xryr6s4   \_ helloworld.2  alpine  udocker03  Shutdown       Rejected less than a second ago  "No such image: alpine:latest"

 

可以看到两个实例分别运行在两个节点上,helloworld.1运行在udocker01上，helloworld.2运行在udocker03上

4.5 在节点2连接容器测试

# docker  exec -it helloworld.2.2q1f6mx8l5lmk0hk42ala5d5v sh

/ # ping helloworld.1.atf4jxs9k9tewnjiisa8bxll7     // 进入容器，ping helloworld.1.atf4jxs9k9tewnjiisa8bxll7 测试网络连通性

PING helloworld.1.atf4jxs9k9tewnjiisa8bxll7 (10.0.0.3): 56 data bytes

64 bytes from 10.0.0.3: seq=0 ttl=64 time=15.526 ms

64 bytes from 10.0.0.3: seq=1 ttl=64 time=0.911 ms

64 bytes from 10.0.0.3: seq=2 ttl=64 time=0.593 ms

64 bytes from 10.0.0.3: seq=3 ttl=64 time=0.907 ms

64 bytes from 10.0.0.3: seq=4 ttl=64 time=0.672 ms

^C

--- helloworld.1.atf4jxs9k9tewnjiisa8bxll7 ping statistics ---

5 packets transmitted, 5 packets received, 0% packet loss

round-trip min/avg/max = 0.593/3.721/15.526 ms

ctrl+p+q 退出容器

至此，完成对ubuntu14.04下docker swarm集群的搭建并验证overlay跨主机网络通信