consul dns 转发配置

 测试使用dnsmasq。

 优势：可以方便的进行应该编码，进行动态域名解析，容错处理。

  因为consul 默认的dns 为127.0.0.1 8600

 所以配置如下：

 文件目录：

/etc/dnsmasq.d ### 目录下

# Enable forward lookup of the 'consul' domain:
server=/consul/127.0.0.1#8600
# Uncomment and modify as appropriate to enable reverse DNS lookups for
# common netblocks found in RFC 1918, 5735, and 6598:
#rev-server=0.0.0.0/8,127.0.0.1#8600
#rev-server=10.0.0.0/8,127.0.0.1#8600
#rev-server=100.64.0.0/10,127.0.0.1#8600
#rev-server=127.0.0.1/8,127.0.0.1#8600
#rev-server=169.254.0.0/16,127.0.0.1#8600
#rev-server=172.16.0.0/12,127.0.0.1#8600
#rev-server=192.168.0.0/16,127.0.0.1#8600
#rev-server=224.0.0.0/4,127.0.0.1#8600
#rev-server=240.0.0.0/4,127.0.0.1#8600

一些额外的配置

# Accept DNS queries only from hosts whose address is on a local subnet.
#local-service
# Don't poll /etc/resolv.conf for changes.
#no-poll
# Don't read /etc/resolv.conf. Get upstream servers only from the command
# line or the dnsmasq configuration file (see the "server" directive below).
#no-resolv
# Specify IP address(es) of other DNS servers for queries not handled
# directly by consul. There is normally one 'server' entry set for every
# 'nameserver' parameter found in '/etc/resolv.conf'. See dnsmasq(8)'s
# 'server' configuration option for details.
#server=1.2.3.4
#server=208.67.222.222
#server=8.8.8.8
# Set the size of dnsmasq's cache. The default is 150 names. Setting the
# cache size to zero disables caching.
#cache-size=65536

nginx 做为负载均使用的方式

使用nginx  的 resolver  

resolver 127.0.0.1:8600;
        set $backend "nginx.service.consul";
        location / {
          proxy_pass  http://$backend;
        }

详细参考：https://www.consul.io/docs/guides/forwarding.html