unbound : change configuration on the fly with unbound-control

unbound 1.4.5

unbound-control set_option で on the fly でコンフィグの変更ができるみたい。
ただし、すべてのオプションを on the fly で変更できるわけではない。
どれが可能 or not は書いてないなー。

unbound-control

set_option opt: val              Set the option to the given value without a reload.   The  cache              is  therefore  not  flushed.  The option must end with a ':' and              whitespace must be between the option and the value.  Some  val-              ues  may  not have an effect if set this way, the new values are              not written to the config file, not all options are supported.       get_option opt              Get the value of the option.  Give the  option  name  without  a              trailing  ':'.  The value is printed.  If the value is "", noth-              ing is printed and the connection closes.  On error 'error  ...'              is  printed  (it  gives  a syntax error on unknown option).  For              some options a list of values, one on  each  line,  is  printed.              Not all options are supported.

現在の設定を取得

root@hat1:~# unbound-control get_option do-tcp no

設定変更

root@hat1:~# unbound-control set_option do-tcp: yes ok

反映された

root@hat1:~# unbound-control get_option do-tcp yes

キャッシュサイズもかえられるのかなー。

root@hat1:~# unbound-control get_option msg-cache-size 4194304

できたっぽい。

root@hat1:~# unbound-control set_option msg-cache-size: 200m ok

root@hat1:~# unbound-control get_option msg-cache-size 209715200

名前解決に使われたネームサーバもチェックできるんだ。

root@hat1:~# unbound-control lookup www.google.co.jp The following name servers are used for lookup of www.google.co.jp. ;rrset 86233 4 0 2 0 google.co.jp. 86233 IN NS ns2.google.com. google.co.jp. 86233 IN NS ns4.google.com. google.co.jp. 86233 IN NS ns3.google.com. google.co.jp. 86233 IN NS ns1.google.com. ;rrset 84681 1 0 8 0 ns1.google.com. 343881 IN A 216.239.32.10 ;rrset 84681 1 0 8 0 ns3.google.com. 343881 IN A 216.239.36.10 ;rrset 84681 1 0 8 0 ns4.google.com. 343881 IN A 216.239.38.10 ;rrset 84681 1 0 8 0 ns2.google.com. 343881 IN A 216.239.34.10 Delegation with 4 names, of which 4 can be examined to query further addresses. It provides 4 IP addresses. 216.239.34.10    rtt 260 msec, 0 lost. EDNS 0 probed. 216.239.38.10    rtt 261 msec, 0 lost. EDNS 0 probed. 216.239.36.10    rtt 189 msec, 0 lost. EDNS 0 probed. 216.239.32.10    rtt 206 msec, 0 lost. EDNS 0 probed.