我们刚刚在我们的一个networking服务器上发生了一个事件。 几个PHP应用程序运行，并开始吐出以下错误信息：
php_network_getaddresses: getaddrinfo failed: Name or service not known
这个消息似乎是networking/ DNS相关。 服务器日志清楚地表明，在发生第一个错误的时候，Ubuntu开始了unattended-upgrades会话。 我将附上下面的dpkg.log的输出。
我们使用外部数据库服务器。
我们决定重启networking服务器，解决了问题，但现在的问题是：
有什么方法可以找出这个问题的根本原因，以便我可以在将来防止它？
从无人值守升级.log输出：
2017-03-21 15:01:56,279 INFO Starting unattended upgrades script 2017-03-21 15:01:56,279 INFO Allowed origins are: ['o=Ubuntu,a=xenial', 'o=Ubuntu,a=xenial-security'] 2017-03-21 15:02:03,365 INFO Packages that will be upgraded: libc-bin libc-dev-bin libc6 libc6-dev libfreetype6 locales multiarch-support 2017-03-21 15:02:03,365 INFO Writing dpkg log to '/var/log/unattended-upgrades/unattended-upgrades-dpkg.log' 2017-03-21 15:02:12,851 INFO All upgrades installed
从dpkg.log输出：
2017-03-21 15:02:03 startup archives unpack 2017-03-21 15:02:03 upgrade libc6-dev:amd64 2.23-0ubuntu5 2.23-0ubuntu6 2017-03-21 15:02:03 status half-configured libc6-dev:amd64 2.23-0ubuntu5 2017-03-21 15:02:03 status unpacked libc6-dev:amd64 2.23-0ubuntu5 2017-03-21 15:02:03 status half-installed libc6-dev:amd64 2.23-0ubuntu5 2017-03-21 15:02:04 status half-installed libc6-dev:amd64 2.23-0ubuntu5 2017-03-21 15:02:04 status unpacked libc6-dev:amd64 2.23-0ubuntu6 2017-03-21 15:02:04 status unpacked libc6-dev:amd64 2.23-0ubuntu6 2017-03-21 15:02:04 upgrade libc-dev-bin:amd64 2.23-0ubuntu5 2.23-0ubuntu6 2017-03-21 15:02:04 status half-configured libc-dev-bin:amd64 2.23-0ubuntu5 2017-03-21 15:02:04 status unpacked libc-dev-bin:amd64 2.23-0ubuntu5 2017-03-21 15:02:04 status half-installed libc-dev-bin:amd64 2.23-0ubuntu5 2017-03-21 15:02:04 status triggers-pending man-db:amd64 2.7.5-1 2017-03-21 15:02:04 status half-installed libc-dev-bin:amd64 2.23-0ubuntu5 2017-03-21 15:02:04 status unpacked libc-dev-bin:amd64 2.23-0ubuntu6 2017-03-21 15:02:04 status unpacked libc-dev-bin:amd64 2.23-0ubuntu6 2017-03-21 15:02:04 upgrade libc6:amd64 2.23-0ubuntu5 2.23-0ubuntu6 2017-03-21 15:02:04 status triggers-pending libc-bin:amd64 2.23-0ubuntu5 2017-03-21 15:02:04 status half-configured libc6:amd64 2.23-0ubuntu5 2017-03-21 15:02:04 status unpacked libc6:amd64 2.23-0ubuntu5 2017-03-21 15:02:04 status half-installed libc6:amd64 2.23-0ubuntu5 2017-03-21 15:02:05 status half-installed libc6:amd64 2.23-0ubuntu5 2017-03-21 15:02:05 status unpacked libc6:amd64 2.23-0ubuntu6 2017-03-21 15:02:05 status unpacked libc6:amd64 2.23-0ubuntu6 2017-03-21 15:02:05 startup packages configure 2017-03-21 15:02:05 configure libc6:amd64 2.23-0ubuntu6 <none> 2017-03-21 15:02:05 status unpacked libc6:amd64 2.23-0ubuntu6 2017-03-21 15:02:05 status unpacked libc6:amd64 2.23-0ubuntu6 2017-03-21 15:02:05 status half-configured libc6:amd64 2.23-0ubuntu6 2017-03-21 15:02:05 status installed libc6:amd64 2.23-0ubuntu6 2017-03-21 15:02:05 trigproc libc-bin:amd64 2.23-0ubuntu5 <none> 2017-03-21 15:02:05 status half-configured libc-bin:amd64 2.23-0ubuntu5 2017-03-21 15:02:05 status installed libc-bin:amd64 2.23-0ubuntu5 2017-03-21 15:02:05 trigproc man-db:amd64 2.7.5-1 <none> 2017-03-21 15:02:05 status half-configured man-db:amd64 2.7.5-1 2017-03-21 15:02:05 status installed man-db:amd64 2.7.5-1 2017-03-21 15:02:05 startup archives unpack 2017-03-21 15:02:05 upgrade locales:all 2.23-0ubuntu5 2.23-0ubuntu6 2017-03-21 15:02:05 status half-configured locales:all 2.23-0ubuntu5 2017-03-21 15:02:05 status unpacked locales:all 2.23-0ubuntu5 2017-03-21 15:02:05 status half-installed locales:all 2.23-0ubuntu5 2017-03-21 15:02:06 status triggers-pending man-db:amd64 2.7.5-1 2017-03-21 15:02:06 status half-installed locales:all 2.23-0ubuntu5 2017-03-21 15:02:06 status unpacked locales:all 2.23-0ubuntu6 2017-03-21 15:02:06 status unpacked locales:all 2.23-0ubuntu6 2017-03-21 15:02:06 upgrade libc-bin:amd64 2.23-0ubuntu5 2.23-0ubuntu6 2017-03-21 15:02:06 status half-configured libc-bin:amd64 2.23-0ubuntu5 2017-03-21 15:02:06 status unpacked libc-bin:amd64 2.23-0ubuntu5 2017-03-21 15:02:06 status half-installed libc-bin:amd64 2.23-0ubuntu5 2017-03-21 15:02:06 status half-installed libc-bin:amd64 2.23-0ubuntu5 2017-03-21 15:02:06 status unpacked libc-bin:amd64 2.23-0ubuntu6 2017-03-21 15:02:06 status unpacked libc-bin:amd64 2.23-0ubuntu6 2017-03-21 15:02:06 trigproc man-db:amd64 2.7.5-1 <none> 2017-03-21 15:02:06 status half-configured man-db:amd64 2.7.5-1 2017-03-21 15:02:07 status installed man-db:amd64 2.7.5-1 2017-03-21 15:02:07 startup packages configure 2017-03-21 15:02:07 configure libc-bin:amd64 2.23-0ubuntu6 <none> 2017-03-21 15:02:07 status unpacked libc-bin:amd64 2.23-0ubuntu6 2017-03-21 15:02:07 status unpacked libc-bin:amd64 2.23-0ubuntu6 2017-03-21 15:02:07 status unpacked libc-bin:amd64 2.23-0ubuntu6 2017-03-21 15:02:07 status unpacked libc-bin:amd64 2.23-0ubuntu6 2017-03-21 15:02:07 status unpacked libc-bin:amd64 2.23-0ubuntu6 2017-03-21 15:02:07 status unpacked libc-bin:amd64 2.23-0ubuntu6 2017-03-21 15:02:07 status half-configured libc-bin:amd64 2.23-0ubuntu6 2017-03-21 15:02:07 status installed libc-bin:amd64 2.23-0ubuntu6 2017-03-21 15:02:07 startup archives unpack 2017-03-21 15:02:07 upgrade multiarch-support:amd64 2.23-0ubuntu5 2.23-0ubuntu6 2017-03-21 15:02:07 status half-configured multiarch-support:amd64 2.23-0ubuntu5 2017-03-21 15:02:07 status unpacked multiarch-support:amd64 2.23-0ubuntu5 2017-03-21 15:02:07 status half-installed multiarch-support:amd64 2.23-0ubuntu5 2017-03-21 15:02:07 status half-installed multiarch-support:amd64 2.23-0ubuntu5 2017-03-21 15:02:07 status unpacked multiarch-support:amd64 2.23-0ubuntu6 2017-03-21 15:02:07 status unpacked multiarch-support:amd64 2.23-0ubuntu6 2017-03-21 15:02:07 startup packages configure 2017-03-21 15:02:07 configure multiarch-support:amd64 2.23-0ubuntu6 <none> 2017-03-21 15:02:07 status unpacked multiarch-support:amd64 2.23-0ubuntu6 2017-03-21 15:02:07 status half-configured multiarch-support:amd64 2.23-0ubuntu6 2017-03-21 15:02:07 status installed multiarch-support:amd64 2.23-0ubuntu6 2017-03-21 15:02:07 startup archives unpack 2017-03-21 15:02:07 upgrade libfreetype6:amd64 2.6.1-0.1ubuntu2 2.6.1-0.1ubuntu2.1 2017-03-21 15:02:07 status triggers-pending libc-bin:amd64 2.23-0ubuntu6 2017-03-21 15:02:07 status half-configured libfreetype6:amd64 2.6.1-0.1ubuntu2 2017-03-21 15:02:07 status unpacked libfreetype6:amd64 2.6.1-0.1ubuntu2 2017-03-21 15:02:07 status half-installed libfreetype6:amd64 2.6.1-0.1ubuntu2 2017-03-21 15:02:07 status half-installed libfreetype6:amd64 2.6.1-0.1ubuntu2 2017-03-21 15:02:07 status unpacked libfreetype6:amd64 2.6.1-0.1ubuntu2.1 2017-03-21 15:02:07 status unpacked libfreetype6:amd64 2.6.1-0.1ubuntu2.1 2017-03-21 15:02:07 trigproc libc-bin:amd64 2.23-0ubuntu6 <none> 2017-03-21 15:02:07 status half-configured libc-bin:amd64 2.23-0ubuntu6 2017-03-21 15:02:07 status installed libc-bin:amd64 2.23-0ubuntu6 2017-03-21 15:02:07 startup packages configure 2017-03-21 15:02:07 configure libc-dev-bin:amd64 2.23-0ubuntu6 <none> 2017-03-21 15:02:07 status unpacked libc-dev-bin:amd64 2.23-0ubuntu6 2017-03-21 15:02:07 status half-configured libc-dev-bin:amd64 2.23-0ubuntu6 2017-03-21 15:02:07 status installed libc-dev-bin:amd64 2.23-0ubuntu6 2017-03-21 15:02:07 configure libc6-dev:amd64 2.23-0ubuntu6 <none> 2017-03-21 15:02:07 status unpacked libc6-dev:amd64 2.23-0ubuntu6 2017-03-21 15:02:07 status half-configured libc6-dev:amd64 2.23-0ubuntu6 2017-03-21 15:02:07 status installed libc6-dev:amd64 2.23-0ubuntu6 2017-03-21 15:02:07 configure locales:all 2.23-0ubuntu6 <none> 2017-03-21 15:02:07 status unpacked locales:all 2.23-0ubuntu6 2017-03-21 15:02:07 status unpacked locales:all 2.23-0ubuntu6 2017-03-21 15:02:07 status half-configured locales:all 2.23-0ubuntu6 2017-03-21 15:02:11 status installed locales:all 2.23-0ubuntu6 2017-03-21 15:02:11 configure libfreetype6:amd64 2.6.1-0.1ubuntu2.1 <none> 2017-03-21 15:02:11 status triggers-pending libc-bin:amd64 2.23-0ubuntu6 2017-03-21 15:02:11 status unpacked libfreetype6:amd64 2.6.1-0.1ubuntu2.1 2017-03-21 15:02:11 status half-configured libfreetype6:amd64 2.6.1-0.1ubuntu2.1 2017-03-21 15:02:11 status installed libfreetype6:amd64 2.6.1-0.1ubuntu2.1 2017-03-21 15:02:11 trigproc libc-bin:amd64 2.23-0ubuntu6 <none> 2017-03-21 15:02:11 status half-configured libc-bin:amd64 2.23-0ubuntu6 2017-03-21 15:02:11 status installed libc-bin:amd64 2.23-0ubuntu6 2017-03-21 15:02:11 startup packages configure
我们看到这种情况影响了我们的环境，并在5小时后再次发生。 考虑回滚到较旧版本的libc6补丁。
这个问题的Ubuntu错误，确认我们都看到： https : //bugs.launchpad.net/ubuntu/+source/eglibc/+bug/1674532
更新：问题已经被修复。
请参阅上述报告中的评论＃16 ， ＃17和＃18 。 更新libc应该可以解决问题。 build议重新启动以确保使用此库的更新期间正在运行的任何正在运行的进程以应有的方式运行。