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Overlay網絡是指通過在現有網絡上疊加一個軟件定義的邏輯網絡，最大程度的保留原有網絡，通過定義其上的邏輯網絡，實現業務邏輯，解決原有數據中心的網絡問題。
快速開始
Docker跨主機網絡方案
docker 原生
第三方方案
之前介紹了Consul搭建集群，所以在此直接選用docker自帶的overlay方案來做，和Consul完美結合。
環境準備
參考之前的一篇《Consul 搭建集群》準備三臺虛機。
| ip | |
|---|---|
| n1 | 172.20.20.10 |
| n2 | 172.20.20.11 |
| n3 | 172.20.20.12 |
在這三臺虛機上啟動consul并創建集群
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
登錄n1
修改 /etc/sysconfig/docker-network為
# /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部分為consul容器節點的ip。
在命令行中輸入 docker network create -d overlay myoverlay創建一個名為myoverlay的網絡,并用 docker network ls檢查docker網絡列表
[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
登錄 n2
修改 /etc/sysconfig/docker-network為
# /etc/sysconfig/docker-network DOCKER_NETWORK_OPTIONS=--cluster-store=consul://172.20.20.11:8500 --cluster-advertise=172.20.20.11:2376
這里不用再次新建立myoverlay網絡了，因為他們是一個集群。直接檢查網絡列表
[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
發現myoverlay已經在其中。
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
啟動容器 驗證overlay網絡
登錄n1以myoverlay啟動一個busybox的容器
[root@n1 sysconfig]# docker run --network myoverlay busybox
查看busybox容器詳情,在最底部有網絡相關的信息
"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"
}
}
可以看到網絡是myoverlay ip 為 10.0.0.2
登錄n2myoverlay啟動一個busybox的容器
[root@n2 sysconfig]# docker run --network myoverlay busybox
查看busybox容器詳情,在最底部有網絡相關的信息
"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"
}
}
這個busybox的ip為10.0.0.3
進入容器,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 網絡搭建成功！
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