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<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://jira.qos.ch/browse/LOGBACK-1325" style="color: #3b73af; text-decoration: none">Re: ERROR in ch.qos.logback.classic.pattern.SyslogStartConverter@2a314cb4 - Could not determine local host name java.net.UnknownHostException: usagem: usagem: Name or service not known at java.net.UnknownHostException: </a> </span> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin: 10px 0 0 0; margin-top: 0">The way the centos 7 and centos 6 behaves when the name servers are not available is different.</p> <p style="margin: 10px 0 0 0"> </p>
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<td class="confluenceTd" style="padding: 0px; border-collapse: collapse; border: 1px solid #cccccc; padding: 3px 4px 3px 4px; font: normal 14px/20px Arial, sans-serif"><span class="error">[root@ip-172-31-67-0 centos]</span># cat /etc/redhat-release<br> <ins><b>CentOS release 6.9 (Final)</b></ins><br> <span class="error">[root@ip-172-31-67-0 centos]</span># cat /etc/resolv.conf<br> ; generated by /sbin/dhclient-script<br> #search ec2.internal<br> #nameserver 172.31.0.2<br> <span class="error">[root@ip-172-31-67-0 centos]</span># hostname<br> ip-172-31-67-0<br> <ins><em><b><span class="error">[root@ip-172-31-67-0 centos]</span># ping ip-172-31-67-0</b></em></ins><br> <ins><em><b>ping: unknown host ip-172-31-67-0</b></em></ins><br> <span class="error">[root@ip-172-31-67-0 centos]</span>#</td>
<td class="confluenceTd" style="padding: 0px; border-collapse: collapse; border: 1px solid #cccccc; padding: 3px 4px 3px 4px; font: normal 14px/20px Arial, sans-serif"><span class="error">[root@ip-172-31-70-19 centos]</span># cat /etc/redhat-release<br> <ins><b>CentOS Linux release 7.3.1611 (Core)</b></ins><br> <span class="error">[root@ip-172-31-70-19 centos]</span># cat /etc/redhat-release<br> CentOS Linux release 7.3.1611 (Core)<br> <span class="error">[root@ip-172-31-70-19 centos]</span># cat /etc/resolv.conf<br> ; generated by /usr/sbin/dhclient-script<br> #search ec2.internal<br> #nameserver 172.31.0.2<br> <span class="error">[root@ip-172-31-70-19 centos]</span># hostname<br> ip-172-31-70-19<br> <ins><b><em><span class="error">[root@ip-172-31-70-19 centos]</span># ping ip-172-31-70-19</em></b></ins><br> <ins><b><em>PING ip-172-31-70-19 (172.31.70.19) 56(84) bytes of data.</em></b></ins><br> <ins><b><em>64 bytes from ip-172-31-70-19 (172.31.70.19): icmp_seq=1 ttl=64 time=0.007 ms</em></b></ins><br> 64 bytes from ip-172-31-70-19 (172.31.70.19): icmp_seq=2 ttl=64 time=0.027 ms<br> 64 bytes from ip-172-31-70-19 (172.31.70.19): icmp_seq=3 ttl=64 time=0.027 ms<br> ^C<br> — ip-172-31-70-19 ping statistics —<br> 3 packets transmitted, 3 received, 0% packet loss, time 1999ms<br> rtt min/avg/max/mdev = 0.007/0.020/0.027/0.010 ms<br> <span class="error">[root@ip-172-31-70-19 centos]</span>#</td>
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</div> <p style="margin: 10px 0 0 0"> </p> <p style="margin: 10px 0 0 0">As you can see above, in case of Centos 7, even when the name servers are commented out, the ping to the hostname works.</p> <p style="margin: 10px 0 0 0">Whereas in case of Centos 6, the ping doesn’t work making the hostname not known.</p> <p style="margin: 10px 0 0 0">The /etc/hosts doesn’t have any entry for the hostname in both the cases.</p> <p style="margin: 10px 0 0 0"> </p> <p style="margin: 10px 0 0 0">So essentially the ping to the hostname, if is successful, will make the SysLog part work.</p> </td>
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