Red Hat Bugzilla – Bug 826769
DNS problems on Windows XP
Last modified: 2015-05-14 21:56:28 EDT
Description of problem: Windows XP DNS causes spurious DNS errors after creating an app. I am guessing we saw some of these errors previously -- and they drove users mad. When an app is created, domain name resolution of the new app is not working. Git errors out with an authentication error - so users go into a wild goose chase for bad ssh keys, when the real reason is broken gethostbyname() call. My best guess of the root cause is http://www.fencepost.net/2009/11/dns-fails-nslookup-works-fix/ Version-Release number of selected component (if applicable): Windows XP SP3, fully patched client tools How reproducible: The problem can usually be observed for a minute up to 10 minutes after app creation. DNS resolution eventually corrects itself. Steps to Reproduce: 1. Create new OpenShift app. 2. ping app-domain.rhcloud.com 3. nslookup app-domain.rhcloud.com Actual results: ping fails. git fails. Expected results: git works.
Sounds tricky, not sure if we will have a fix for this but at least we can think about a workaround like displaying a message if we detect the DNS lookup fails in the first time.
Fotios suggested having a look if we can use something like ipconfig /flushdns.
Implemented a workaround, running tests right now and I'll pull request right after that.
"Fixed" in rhc-0.94.7-1+. This is not something that could be fixed easily according to our research, and fixing it would probably require the installation of additional tools and service packs. So from now on when we detect this issue happening (by checking the platform and then running ping and nslookup) we will not rollback the app creation but show a message warning the user to do a git clone manually after a few minutes.
verified in rhc-0.94.7 after app creation,successfully ping,nslookup and git clone without errors. defect fiexd in rhc-0.94.7
Here are some detailed information for this verification: OS : infomation:Windows XP Service Pack 3 rhc : rhc-0.94.7 App creation: C:\test>rhc app create -a testdns -t jbossas-7 Password: ****** ...... testdns published: http://testdns-nn4.int.rhcloud.com/ git url: ssh://01257fe0af83446aa8cf4e241584fede@testdns-nn4.int.rhcloud.com/~/g it/testdns.git/ Successfully created application: testdns C:\test>ping testdns-nn4.int.rhcloud.com Pinging ec2-184-72-165-106.compute-1.amazonaws.com [184.72.165.106] with 32 byte s of data: Reply from 184.72.165.106: bytes=32 time=279ms TTL=45 Reply from 184.72.165.106: bytes=32 time=278ms TTL=45 Reply from 184.72.165.106: bytes=32 time=274ms TTL=45 Reply from 184.72.165.106: bytes=32 time=274ms TTL=45 Ping statistics for 184.72.165.106: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 274ms, Maximum = 279ms, Average = 276ms C:\test>nslookup testdns-nn4.int.rhcloud.com *** Can't find server name for address 192.168.122.1: Non-existent domain *** Default servers are not available Server: UnKnown Address: 192.168.122.1 Non-authoritative answer: Name: ec2-184-72-165-106.compute-1.amazonaws.com Address: 184.72.165.106 Aliases: testdns-nn4.int.rhcloud.com, ex-sml-node1.int.rhcloud.com Visit application website successfully git clone: C:\test\tmp>git clone ssh://01257fe0af83446aa8cf4e241584fede@testdns-nn4.int.rh cloud.com/~/git/testdns.git/ Cloning into 'testdns'... remote: Counting objects: 39, done. remote: Compressing objects: 100% (29/29), done. remote: Total 39 (delta 1), reused 0 (delta 0) Receiving objects: 100% (39/39), 19.51 KiB, done. Resolving deltas: 100% (1/1), done. C:\test\tmp>dir testdns Volume in drive C has no label. Volume Serial Number is 38F0-8B4B Directory of C:\test\tmp\testdns 06/21/2012 01:01 PM <DIR> . 06/21/2012 01:01 PM <DIR> .. 06/21/2012 01:01 PM 8 .gitignore 06/21/2012 01:01 PM <DIR> .openshift 06/21/2012 01:01 PM <DIR> deployments 06/21/2012 01:01 PM 1,744 pom.xml 06/21/2012 01:01 PM 7,775 README 06/21/2012 01:01 PM <DIR> src 3 File(s) 9,527 bytes 5 Dir(s) 7,606,976,512 bytes free