PHP jogando erros no servidor depois que o Ubuntu executou uma sessão de upgrades não assistidos - alguma maneira de determinar a causa?

Question

Acabamos de ter um incidente em um de nossos servidores da web. Vários aplicativos PHP são executados nele e começaram a enviar a seguinte mensagem de erro:

php_network_getaddresses: getaddrinfo failed: Name or service not known

Esta mensagem parece estar relacionada com network / dns. Os registros do servidor indicaram claramente que, na época em que ocorreu o primeiro erro, o Ubuntu iniciou uma sessão unattended-upgrades . Vou anexar a saída de dpkg.log abaixo.

Nós usamos um servidor de banco de dados externo.

Decidimos reiniciar o servidor da Web, o que resolveu o problema, mas a questão agora é:

Existe alguma maneira de descobrir a causa subjacente deste problema para que eu possa preveni-lo no futuro?

Saída de unattended-upgrades.log :

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

Saída de dpkg.log :

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

    

Answer 1

Vimos que isso atingiu nosso ambiente e aconteceu novamente 5 horas depois. Considerando a reversão para uma versão mais antiga do patch libc6.

Aqui está o bug do Ubuntu para este problema que confirma o que todos nós estamos vendo: link

Atualização: o problema já foi corrigido.

Veja os comentários # 16 , # 17 e # 18 no relatório acima. A atualização de libc deve resolver o problema. Recomenda-se uma reinicialização para garantir que os processos em execução que estão sendo executados durante a atualização que faz uso dessa biblioteca continuem funcionando da maneira esperada.