CoreDNS配置文件解析

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Coredns配置文件

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.:54 {
    logger {
      level INFO
      processname pfdns
    }


proxy . /etc/resolv.conf
}


# all other domains are subject to interception
:53 {
    logger {
      level INFO
      processname pfdns
    }

    pfdns {
    }
    # Anything not handled by pfdns will be resolved normally

    # Default to system resolv.conf file
    proxy . /etc/resolv.conf
    log stdout
    errors
}

resolv.conf文件解析

resolv.conf包含以下两个关键词：search 和 nameserver
nameserver后指定dns服务器ip，如8.8.8.8为google的dns服务器。
而search 则指定域名参数，当访问的域名参数无法被DNS解析时，resolver会在该域加上search参数，重新发送DNS请求，直到被正确解析或遍历完search中的列表。

例一：

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[root@A hikari]# cat /etc/resolv.conf 
# Generated by NetworkManager
search  localdomain
nameserver 8.8.8.8

root@A hikari]# ping news
ping: news: Name or service not known

例二：

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[root@A hikari]# cat /etc/resolv.conf 
# Generated by NetworkManager
search google.com localdomain
nameserver 8.8.8.8

[root@A hikari]# ping news
PING news.google.com (172.217.24.14) 56(84) bytes of data.