Docker Swarm 创建overlay网络
Posted liujunjun
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环境：
CentOS Linux release 7.4.1708 (Core) Docker version 19.03.5, build 633a0ea 管理节点：192.168.1.220 工作节点：192.168.1.221 工作节点：192.168.1.222
一、创建网络与服务
1、管理节点：创建overlay网络名字为my-network
[root@docker-01 ~]# docker network create --driver overlay my-network pc3xhx63syp9p65ot6yaqm2ej [root@docker-01 ~]# docker network ls NETWORK ID NAME DRIVER SCOPE pc3xhx63syp9 my-network overlay swarm 00c1eda0108e none null local
2、管理节点：创建服务并使用overlay网络。
注：busybox启动失败后manager尝试重启容器，但是busybox容器内没有持续运行的任务，manager会将它关闭，所以没有启动成功。向容器添加ping www.baidu.com持续动作避免容器关闭。
[root@docker-01 ~]# docker service create --replicas 3 --network my-network --name test busybox ping www.baidu.com 1fvx4gtmbhl2sm8e7g7j8hf8o overall progress: 3 out of 3 tasks 1/3: running [==================================================>] 2/3: running [==================================================>] 3/3: running [==================================================>] verify: Service converged
# 创建服务 docker service create # 副本数 --replicas 3 # 添加网络 --network my-network # 服务名 --name test # 镜像 busybox # 容器执行指令 ping www.baidu.com
[root@docker-01 ~]# docker service ps test ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS h76dz7b16etb test.1 busybox:latest docker-02 Running Running 9 minutes ago lgse45b0hcfz test.2 busybox:latest docker-03 Running Running 9 minutes ago 5vp9r0z0gmhk test.3 busybox:latest docker-01 Running Running 12 minutes ago
二、测试网络连通
1、工作节点1与2：进入容器测试连通情况
[root@docker-02 ~]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 244d215ed21b busybox:latest "ping www.baidu.com" 2 minutes ago Up 2 minutes test.1.h76dz7b16etb3h7n2cm8mrbpe [root@docker-02 ~]# docker exec -it 244d215ed21b sh / # ifconfig eth0 Link encap:Ethernet HWaddr 02:42:0A:00:01:05 inet addr:10.0.1.5 Bcast:10.0.1.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1450 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) eth1 Link encap:Ethernet HWaddr 02:42:AC:12:00:03 inet addr:172.18.0.3 Bcast:172.18.255.255 Mask:255.255.0.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:214 errors:0 dropped:0 overruns:0 frame:0 TX packets:207 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:20235 (19.7 KiB) TX bytes:19570 (19.1 KiB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:4 errors:0 dropped:0 overruns:0 frame:0 TX packets:4 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1 RX bytes:379 (379.0 B) TX bytes:379 (379.0 B)
[root@docker-03 ~]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 0495920cc2c4 busybox:latest "ping www.baidu.com" 4 minutes ago Up 4 minutes test.2.lgse45b0hcfzdbgjke0g6jw5e [root@docker-03 ~]# docker exec -it 0495920cc2c4 sh / # ifconfig eth0 Link encap:Ethernet HWaddr 02:42:0A:00:01:03 inet addr:10.0.1.3 Bcast:10.0.1.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1450 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) eth1 Link encap:Ethernet HWaddr 02:42:AC:12:00:03 inet addr:172.18.0.3 Bcast:172.18.255.255 Mask:255.255.0.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:293 errors:0 dropped:0 overruns:0 frame:0 TX packets:287 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:27775 (27.1 KiB) TX bytes:27180 (26.5 KiB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:4 errors:0 dropped:0 overruns:0 frame:0 TX packets:4 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1 RX bytes:379 (379.0 B) TX bytes:379 (379.0 B) / #
/ # ping 10.0.1.3 PING 10.0.1.3 (10.0.1.3): 56 data bytes 64 bytes from 10.0.1.3: seq=0 ttl=64 time=0.739 ms 64 bytes from 10.0.1.3: seq=1 ttl=64 time=1.145 ms 64 bytes from 10.0.1.3: seq=2 ttl=64 time=1.354 ms ^C --- 10.0.1.3 ping statistics --- 3 packets transmitted, 3 packets received, 0% packet loss round-trip min/avg/max = 0.739/1.079/1.354 ms / # ping 10.0.1.5 PING 10.0.1.5 (10.0.1.5): 56 data bytes 64 bytes from 10.0.1.5: seq=0 ttl=64 time=0.875 ms 64 bytes from 10.0.1.5: seq=1 ttl=64 time=1.055 ms 64 bytes from 10.0.1.5: seq=2 ttl=64 time=1.168 ms 64 bytes from 10.0.1.5: seq=3 ttl=64 time=1.095 ms ^C --- 10.0.1.5 ping statistics --- 4 packets transmitted, 4 packets received, 0% packet loss round-trip min/avg/max = 0.875/1.048/1.168 ms
三、其他动作
将现有服务连接到overlay网络
docker service update --network-add my-network hello
删除正在运行的网络连接
docker service update --network-rm my-network hello
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