Question

我有多个服务在docker容器中运行，一个nginx服务器在它们前面，所有容器都在同一个docker网络中。在docker 1.10之前，我创建了一个dnsmasq容器并在nginx中设置了解析器，以便可以从nginx中发现我的服务。

但升级到docker 1.10.1后，dnsmasq图像无效。经过一些研究，我尝试使用地址127.0.0.11中的新“嵌入式dns”（我认为这应该是在docker网络中使用的正确方法）。虽然我可以从nginx容器ping到服务容器，但是nginx继续发回could not be resolved (3: Host not found)。

然后我尝试使用host命令，我得到了非常令人困惑的结果:(第一个ip地址，然后找不到主机 - 与我从nginx获得的代码相同）

# host service-ui
service-ui has address 172.18.0.7
Host service-ui not found: 3(NXDOMAIN)
Host service-ui not found: 3(NXDOMAIN)

Ping工作

/# ping service-ui
PING service-ui (172.18.0.7): 56 data bytes
64 bytes from 172.18.0.7: icmp_seq=0 ttl=64 time=1.123 ms
64 bytes from 172.18.0.7: icmp_seq=1 ttl=64 time=0.131 ms
64 bytes from 172.18.0.7: icmp_seq=2 ttl=64 time=0.178 ms

以下是我的配置的简化版本：

搬运工-compose.yml

version: '2'

services:
  nginx:
    build: .
    ports:
      - 80:80   
  service-ui:
    image: service-ui
networks:
  default:
    external:
      name: ssx

容器中的

nginx.conf

 location ~ /([a-z]*)/ {
  resolver 127.0.0.11;
  proxy_pass http://$1-ui:9000$uri$is_args$args;
}

以下是来自主持人的详细结果：

# host -v service-ui
Trying "service-ui"
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 55237
;; flags: qr rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;service-ui.            IN  A

;; ANSWER SECTION:
service-ui.     1800    IN  A   172.18.0.7

Received 52 bytes from 127.0.0.11#53 in 1 ms
Trying "service-ui"
Host service-ui not found: 3(NXDOMAIN)
Received 102 bytes from 127.0.0.11#53 in 1 ms
Received 102 bytes from 127.0.0.11#53 in 1 ms
Trying "service-ui"
Host service-ui not found: 3(NXDOMAIN)
Received 102 bytes from 127.0.0.11#53 in 1 ms
Received 102 bytes from 127.0.0.11#53 in 1 ms

我的码头版

Client:
 Version:      1.10.1
 API version:  1.22
 Go version:   go1.5.3
 Git commit:   9e83765
 Built:        Thu Feb 11 19:27:08 2016
 OS/Arch:      linux/amd64

Server:
 Version:      1.10.1
 API version:  1.22
 Go version:   go1.5.3
 Git commit:   9e83765
 Built:        Thu Feb 11 19:27:08 2016
 OS/Arch:      linux/amd64

任何人都可以帮我弄清楚出了什么问题吗？或者如何深入研究这个问题？

Answer 1

这是因为docker dns服务器不执行ipv6，但是从1.5.8开始，nginx解析器同时查询ipv6和ipv4：http://nginx.org/en/docs/http/ngx_http_core_module.html#resolver

你可以在nginx的解析器行上轻松禁用ipv6（参见上面的链接，它只是ipv6 = off）然后它应该开始为你工作。

Nginx无法从docker 1.10.1中的嵌入式DNS获取主机

1 个答案: