使用HAProxy和Docker进行动态DNS解析

Question

我正在尝试在Docker主机中设置HAProxy.

使用HAProxy 1.7和Docker 1.12

我的haproxy.cfg看起来像:

# Simple configuration for an HTTP proxy listening on port 81 on all
# interfaces and forwarding requests to a single backend "servers" with a
# single server "server1" listening on 127.0.0.1:8000
global
    daemon
    maxconn 256

resolvers docker
    # nameserver dnsmasq 127.0.0.1:53
    nameserver dns 127.0.0.1:53

defaults
    mode http
    timeout connect 5000ms
    timeout client 50000ms
    timeout server 50000ms
    default-server init-addr none

frontend http-in
    bind *:80
    default_backend www_somedomain1_com

    # Define hosts
    acl host_www_somedomain1_com hdr(host) -i somedomain1.com
    acl host_www_somedomain1_com hdr(host) -i www.somedomain1.com
    acl host_www_somedomain2_com hdr(host) -i www.somedomain2.com

    ## figure out which one to use
    use_backend www_somedomain1_com if host_www_somedomain1_com
    use_backend www_somedomain2_com if host_www_somedomain2_com

backend www_somedomain1_com
    # Utilizing the Docker DNS to resolve below host
    # server server1 www-somedomain1-com maxconn 32 check port 80
    server server1 www-somedomain1-com resolvers docker check maxconn 32

backend www_somedomain2_com
    # Utilizing the Docker DNS to resolve below host
    # server server1 www-somedomain2-com maxconn 32 check resolvers docker resolve-prefer ipv4
    server server1 www-somedomain2-com maxconn 32 check port 80

我想使用Docker的嵌入式DNS系统 - 据我所知,只有在使用用户定义的网络时才启用.

所以我创建了一个网络(使用默认的桥驱动程序)

docker network create mynetwork

当我运行我的两个命名的docker容器(my-haproxy和www-somedomain1-com)时,我将它们添加到带有--net标志的网络中.

Docker运行命令:

docker run --name myhaproxy --net mynetwork -p 80:80 -d haproxy
docker run --name www-somedomain1-com --net mynetwork -d nginx

我知道Docker dns是有用的,因为当我在bash shell中跳转时,我可以从一个容器解析到另一个容器.我无法在HAProxy中获得正确的组合/配置以启用动态DNS解析.

HAProxy stats页面总是将下游后端显示为棕色/分辨率问题....

一些有帮助的事情: - "default-server init-addr none"有助于在启动时传递haproxy配置检查.

非常感谢任何指导!

Answer 1

我认为您的问题是127.0.0.1:53，当它需要127.0.0.11:53用于docker bridge网络时，您正在使用您的解析器dns 。

这是我为开发人员docker设置的haproxy设置：

global
    quiet

defaults
    log global
    mode http
    option forwardfor
    timeout connect 60s
    timeout client 60s
    timeout server 60s
    default-server init-addr none

resolvers docker_resolver
    nameserver dns 127.0.0.11:53

frontend https-proxy
    bind 0.0.0.0:80
    bind 0.0.0.0:443 ssl crt /usr/local/etc/haproxy/dev_server.pem
    redirect scheme https if !{ ssl_fc }

    acl is_api_server hdr(host) -i mywebsite

    use_backend api_server if is_api_server

backend api_server
    server haproxyapi api-server-dev:80 check inter 10s resolvers docker_resolver resolve-prefer ipv4