docker 无法指定容器连接

Question

docker 配置： root@ubuntu> ps -ef | grep docker root xxxxx /usr/bin/dockerd -H fd:// -b=br0 --icc=false --iptables=true

启动“网络”容器：

docker run -d --name web -p 8080:80 php-fpm:5.4

启动“测试”容器：

docker run -dit --name test --link web:web blackhole/ubuntu:0.1 bash

iptables 过滤器：

root@ubuntu> sudo iptables -L -n
Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain FORWARD (policy DROP)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         

Chain DOCKER (0 references)
target     prot opt source               destination         
ACCEPT     tcp  --  0.0.0.0/0            192.168.100.2        tcp dpt:80
ACCEPT     tcp  --  192.168.100.3        192.168.100.2        tcp dpt:80
ACCEPT     tcp  --  192.168.100.2        192.168.100.3        tcp spt:80
ACCEPT     tcp  --  192.168.100.3        192.168.100.2        tcp dpt:443
ACCEPT     tcp  --  192.168.100.2        192.168.100.3        tcp spt:443
ACCEPT     tcp  --  192.168.100.3        192.168.100.2        tcp dpt:22
ACCEPT     tcp  --  192.168.100.2        192.168.100.3        tcp spt:22

在“测试”容器中：

sudo docker exec -it test bash
root@00585b9efea8:/# cat /etc/hosts
127.0.0.1   localhost
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
192.168.100.2   web 2cec3235f5fa
192.168.100.3   00585b9efea8
root@00585b9efea8:/# ping web
PING web (192.168.100.2): 56 data bytes
^C--- web ping statistics ---
12 packets transmitted, 0 packets received, 100% packet loss
root@00585b9efea8:/# ping 192.168.100.2
PING 192.168.100.2 (192.168.100.2): 56 data bytes
^C--- 192.168.100.2 ping statistics ---
12 packets transmitted, 0 packets received, 100% packet loss
root@00585b9efea8:/# curl web
^C
root@00585b9efea8:/# curl http://192.168.100.2:80
^C

指定容器的三个条件：

--icc=fasle

--iptables=true

--链接

没问题，为什么不呢？

ubuntu 版本：16.04.2 LTS 码头工人版本：.13.1 内核版本：4.9.0-040900-generic

Answer 1

link 选项一直是 deprecated。对于基于 DNS 的服务发现，您应该创建一个新的桥接网络并指定 --net 以让 docker 容器加入该网络：

创建新的桥接网络：

docker network create --subnet=192.168.177.0/24 --gateway=192.168.177.1 www

在这个网络上创建两个容器：

docker run -d --name=nginx1 --net=www nginx:1-alpine
docker run -d --name=nginx2 --net=www nginx:1-alpine

尝试按名称相互 ping 通：

docker exec -it nginx1 /bin/sh
/ # ping nginx2
PING nginx2 (192.168.177.3): 56 data bytes
64 bytes from 192.168.177.3: seq=0 ttl=64 time=0.113 ms
64 bytes from 192.168.177.3: seq=1 ttl=64 time=0.123 ms

--- nginx2 ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max = 0.113/0.118/0.123 ms

您可以通过执行docker network inspect www查看此网络上的容器

更多信息可以在这里找到： https://docs.docker.com/engine/userguide/networking/