有更好的解决方案吗?
绝对!容器之间的通讯完全不需要主机ip。如果将link
容器包含在docker-compose.yaml
文件中,则可以访问许多环境变量,可用于发现服务的ip地址。
例如,考虑具有两个容器的docker-compose配置:一个使用consul
,另一个运行需要与领事交谈的服务。
consul:
image: progrium/consul
command: -server -bootstrap
webserver:
image: larsks/mini-httpd
links:
- consul
首先,从consul
just开头-server -bootstrap
,consul
找出它自己的广告地址,例如:
consul_1 | ==> Consul agent running!
consul_1 | Node name: 'f39ba7ef38ef'
consul_1 | Datacenter: 'dc1'
consul_1 | Server: true (bootstrap: true)
consul_1 | Client Addr: 0.0.0.0 (HTTP: 8500, HTTPS: -1, DNS: 53, RPC: 8400)
consul_1 | Cluster Addr: 172.17.0.4 (LAN: 8301, WAN: 8302)
consul_1 | Gossip encrypt: false, RPC-TLS: false, TLS-Incoming: false
consul_1 | Atlas: <disabled>
在webserver
容器中,我们发现以下环境变量可用于pid 1:
CONSUL_PORT=udp://172.17.0.4:53
CONSUL_PORT_8300_TCP_START=tcp://172.17.0.4:8300
CONSUL_PORT_8300_TCP_ADDR=172.17.0.4
CONSUL_PORT_8300_TCP_PROTO=tcp
CONSUL_PORT_8300_TCP_PORT_START=8300
CONSUL_PORT_8300_UDP_END=udp://172.17.0.4:8302
CONSUL_PORT_8300_UDP_PORT_END=8302
CONSUL_PORT_53_UDP=udp://172.17.0.4:53
CONSUL_PORT_53_UDP_ADDR=172.17.0.4
CONSUL_PORT_53_UDP_PORT=53
CONSUL_PORT_53_UDP_PROTO=udp
CONSUL_PORT_8300_TCP=tcp://172.17.0.4:8300
CONSUL_PORT_8300_TCP_PORT=8300
CONSUL_PORT_8301_TCP=tcp://172.17.0.4:8301
CONSUL_PORT_8301_TCP_ADDR=172.17.0.4
CONSUL_PORT_8301_TCP_PORT=8301
CONSUL_PORT_8301_TCP_PROTO=tcp
CONSUL_PORT_8301_UDP=udp://172.17.0.4:8301
CONSUL_PORT_8301_UDP_ADDR=172.17.0.4
CONSUL_PORT_8301_UDP_PORT=8301
CONSUL_PORT_8301_UDP_PROTO=udp
CONSUL_PORT_8302_TCP=tcp://172.17.0.4:8302
CONSUL_PORT_8302_TCP_ADDR=172.17.0.4
CONSUL_PORT_8302_TCP_PORT=8302
CONSUL_PORT_8302_TCP_PROTO=tcp
CONSUL_PORT_8302_UDP=udp://172.17.0.4:8302
CONSUL_PORT_8302_UDP_ADDR=172.17.0.4
CONSUL_PORT_8302_UDP_PORT=8302
CONSUL_PORT_8302_UDP_PROTO=udp
CONSUL_PORT_8400_TCP=tcp://172.17.0.4:8400
CONSUL_PORT_8400_TCP_ADDR=172.17.0.4
CONSUL_PORT_8400_TCP_PORT=8400
CONSUL_PORT_8400_TCP_PROTO=tcp
CONSUL_PORT_8500_TCP=tcp://172.17.0.4:8500
CONSUL_PORT_8500_TCP_ADDR=172.17.0.4
CONSUL_PORT_8500_TCP_PORT=8500
CONSUL_PORT_8500_TCP_PROTO=tcp
映像的每个端口EXPOSE
d都有一组变量consul
。例如,在第二张图中,我们可以通过连接到以下命令来与领事REST API进行交互:
http://${CONSUL_PORT_8500_TCP_ADDR}:8500/