Question

我在FreeBSD 10桌面上使用Unbound作为本地DNS缓存解析器，但是，我不知道如何在其配置文件中为“cache-min-ttl”确定正确的值。我在Google上搜索过，但似乎没有明确的答案。目前，1800是我的选择但不确定。这是我的配置文件Unbound：

server:
    interface: 0.0.0.0
    verbosity: 1
    cache-min-ttl: 1800
    logfile: /var/unbound/unbound.log
    pidfile: /var/run/local_unbound.pid

forward-zone:
      name: "."
      forward-addr: 114.114.114.114        # 114 DNS
      forward-addr: 114.114.115.115        # 114 DNS
      forward-addr: 8.8.8.8        # Google Public DNS
      forward-addr: 8.8.4.4        # Google Public DNS
      forward-addr: 199.85.126.10        # Norton DNS
      forward-addr: 199.85.127.10        # Norton DNS

Answer 1

对于桌面，您不需要自己编写配置文件。脚本local-unbound-setup将自动为您执行此操作。自动生成的设置如下所示：

# Generated by local-unbound-setup
server:
        username: unbound
        directory: /var/unbound
        chroot: /var/unbound
        pidfile: /var/run/local_unbound.pid
        auto-trust-anchor-file: /var/unbound/root.key

（resolv.conf中的姓名服务器将添加到/var/unbound/forward.conf。请参阅/usr/sbin/local-unbound-setup。

这意味着cache-min-ttl保持默认值，根据unbound.conf（5）手册页，该值为零;

   cache-min-ttl: <seconds>
          Time to live minimum for  RRsets  and  messages  in  the  cache.
          Default  is  0.  If the the minimum kicks in, the data is cached
          for longer than the domain owner intended, and thus less queries
          are  made  to look up the data.  Zero makes sure the data in the
          cache is as the domain owner intended, higher values, especially
          more  than an hour or so, can lead to trouble as the data in the
          cache does not match up with the actual data any more.

如何确定“cache-min-ttl”的正确值

1 个答案: