> On Sun, 9 Mar 2014, Tanky Woo wrote: > > > rsyslog version is 5.8 > > > > I found rsyslogd will be blocked, if the remote server domain name can’t > > resolve because of timeout. > > > > I configured the rsyslogd to send log to remote by udp: > > > > *.* @xxx.com:514 > > > > now the name server has problem and the dns request will timeout(only > > timeout will cause this problem). the cause the rsyslogd can’t work right. > > > > I use logger to send log, and no log will write in /var/log/syslog。 > > > > I just add the domain in /etc/hosts to solve this problem. But is there any > > other way, or is it a bug in v5? > > The message where the timeout happens will eventually get into the log, but > the > problem is that while it is stalled waiting for the timeout, other UDP > messages > will end up getting dropped. > > you can disable name resolution entirely by starting rsyslog with the -x flag > (it won't even use /etc/hosts at that point) > > This is a problem with basically every syslog daemon from the beginning. > Rsyslog > 7+ has a DNS cache, but I'm not sure that it will cach failures, so you may > still have a problem (I think it also changes the point at which the DNS > resolution happens, so it may receive message without a problem, but then get > stuck writing them out) > > David Lang I have already setted the `-x` options: RSYSLOGD_OPTIONS="-c5 -Q -x” and it will still blocked. and the manual say: -x Disable DNS for remote messages. if I disable it, it will not do name resolution, how can the rsyslog to use xxx.com in configuration? then: > The message where the timeout happens will eventually get into the log, but > the problem is that while it is stalled waiting for the timeout, other UDP > messages will end up getting dropped. If it is stalled waiting for the timeout, and the udp messages will dropped, why rsyslog won’t write message to file, I just move that statements to the end of the configuration.
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