Docker overlay 网络搭建的方法

Overlay网络是指通过在现有网络上叠加一个软件定义的逻辑网络，最大程度的保留原有网络，通过定义其上的逻辑网络，实现业务逻辑，解决原有数据中心的网络问题。

快速开始

Docker跨主机网络方案

docker 原生

overlay macvlan

第三方方案

flannel weave calico

之前介绍了Consul搭建集群，所以在此直接选用docker自带的overlay方案来做，和Consul完美结合。

环境准备

参考之前的一篇《Consul 搭建集群》准备三台虚机。

ip n1 172.20.20.10 n2 172.20.20.11 n3 172.20.20.12

在这三台虚机上启动consul并创建集群

n1

[root@n1 vagrant]# consul agent -server -bootstrap-expect 3 -data-dir /etc/consul.d -node=node1 -bind=172.20.20.10 -ui -client 0.0.0.0

n2

[root@n2 vagrant]# consul agent -server -bootstrap-expect 3 -data-dir /etc/consul.d -node=node2 -bind=172.20.20.11 -ui -client 0.0.0.0 -join 172.20.20.10

n3

[root@n3 vagrant]# consul agent -server -bootstrap-expect 3 -data-dir /etc/consul.d -node=node3 -bind=172.20.20.12 -ui -client 0.0.0.0 -join 172.20.20.10 [root@n1 vagrant]# consul members Node Address Status Type Build Protocol DC Segment node1 172.20.20.10:8301 alive server 1.1.0 2 dc1 <all> node2 172.20.20.11:8301 alive server 1.1.0 2 dc1 <all> node3 172.20.20.12:8301 alive server 1.1.0 2 dc1 <all>

配置 docker

登录n1

修改 /etc/sysconfig/docker-network为

# /etc/sysconfig/docker-network DOCKER_NETWORK_OPTIONS=–cluster-store=consul://172.20.20.10:8500 –cluster-advertise=172.20.20.10:2376

其中ip部分为consul容器节点的ip。

在命令行中输入 docker network create -d overlay myoverlay创建一个名为myoverlay的网络,并用 docker network ls检查docker网络列表

[root@n1 sysconfig]# docker network ls NETWORK ID NAME DRIVER SCOPE 5a8df7650e34 bridge bridge local 8e574df4fb90 docker_gwbridge bridge local d69aab5b2621 host host local 7301c62bca4d none null local [root@n1 sysconfig]# docker network create -d overlay myoverlay 36feac75fb49edcf8920ed39109424b833501268942fb563708aa306fccfb15c [root@n1 sysconfig]# docker network ls NETWORK ID NAME DRIVER SCOPE 5a8df7650e34 bridge bridge local 8e574df4fb90 docker_gwbridge bridge local d69aab5b2621 host host local 36feac75fb49 myoverlay overlay global 7301c62bca4d none null local

登录 n2

修改 /etc/sysconfig/docker-network为

# /etc/sysconfig/docker-network DOCKER_NETWORK_OPTIONS=–cluster-store=consul://172.20.20.11:8500 –cluster-advertise=172.20.20.11:2376

这里不用再次新建立myoverlay网络了，因为他们是一个集群。直接检查网络列表

[root@n2 vagrant]# docker network ls NETWORK ID NAME DRIVER SCOPE 9f2b7d40a69f bridge bridge local 1d9ee9546c81 docker_gwbridge bridge local e1f72fa7710c host host local 36feac75fb49 myoverlay overlay global 372109bb13bc none null local

发现myoverlay已经在其中。

同理操作n3

[root@n3 vagrant]# docker network ls NETWORK ID NAME DRIVER SCOPE 14cf16d37c9b bridge bridge local ca426545fedb docker_gwbridge bridge local b57d2f555fa2 host host local 36feac75fb49 myoverlay overlay global fcb5da0380e4 none null local

启动容器 验证overlay网络

登录n1以myoverlay启动一个busybox的容器

[root@n1 sysconfig]# docker run –network myoverlay busybox

查看busybox容器详情,在最底部有网络相关的信息

“Networks”: { “myoverlay”: { “IPAMConfig”: null, “Links”: null, “Aliases”: [ “e7d558b35607” ], “NetworkID”: “36feac75fb49edcf8920ed39109424b833501268942fb563708aa306fccfb15c”, “EndpointID”: “6b1c975847b506a151940893e3ac189a7053cb34dda4ec2b5797c93f6eeb3534”, “Gateway”: “”, “IPAddress”: “10.0.0.2”, “IPPrefixLen”: 24, “IPv6Gateway”: “”, “GlobalIPv6Address”: “”, “GlobalIPv6PrefixLen”: 0, “MacAddress”: “02:42:0a:00:00:02” } }

可以看到网络是myoverlay ip 为 10.0.0.2

登录n2myoverlay启动一个busybox的容器

[root@n2 sysconfig]# docker run –network myoverlay busybox

查看busybox容器详情,在最底部有网络相关的信息

“Networks”: { “myoverlay”: { “IPAMConfig”: null, “Links”: null, “Aliases”: [ “f673ccb5ab32” ], “NetworkID”: “36feac75fb49edcf8920ed39109424b833501268942fb563708aa306fccfb15c”, “EndpointID”: “39f8e9e098ce3faf039aa60e275ec90428f86c6378f5b4c54d8682741e71673f”, “Gateway”: “”, “IPAddress”: “10.0.0.3”, “IPPrefixLen”: 24, “IPv6Gateway”: “”, “GlobalIPv6Address”: “”, “GlobalIPv6PrefixLen”: 0, “MacAddress”: “02:42:0a:00:00:03” } }

这个busybox的ip为10.0.0.3

进入容器,ping 10.0.0.2

[root@n2 vagrant]# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES f673ccb5ab32 busybox “sh” 2 minutes ago Up 2 minutes objective_pare [root@n2 vagrant]# docker exec -ti f673ccb5ab32 /sh / # ping 10.0.0.2 PING 10.0.0.2 (10.0.0.2): 56 data bytes 64 bytes from 10.0.0.2: seq=0 ttl=64 time=1.309 ms 64 bytes from 10.0.0.2: seq=1 ttl=64 time=0.535 ms 64 bytes from 10.0.0.2: seq=2 ttl=64 time=1.061 ms 64 bytes from 10.0.0.2: seq=3 ttl=64 time=0.764 ms ^C — 10.0.0.2 ping statistics — 4 packets transmitted, 4 packets received, 0% packet loss round-trip min/avg/max = 0.535/0.917/1.309 ms

ping 是通的， overlay 网络搭建成功！

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