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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