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https://issues.apache.org/jira/browse/MESOS-10190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17203878#comment-17203878
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acecile5555555 commented on MESOS-10190:
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Hello [~qianzhang]
How can I check "mount namespace" content ? Because the container fails to
start so I guess it gets deleted.
I guess the only way is to modify the code you have linked to output some
debugging information ? Sadly I'm not skilled enough to play with gdb but I can
rebuild Mesos with added debug info printed to stderr
Regards, Adam.
> libprocess fails with "Failed to obtain the IP address for <uuid>" when using
> CNI on some hosts
> -----------------------------------------------------------------------------------------------
>
> Key: MESOS-10190
> URL: https://issues.apache.org/jira/browse/MESOS-10190
> Project: Mesos
> Issue Type: Bug
> Components: executor
> Affects Versions: 1.9.0
> Reporter: acecile5555555
> Priority: Major
>
> Hello,
>
> We deployed CNI support and 3 of our hosts (all the same) are failing to
> start container with CNI enabled. The log file is:
> {noformat}
> E0917 16:58:11.481551 16770 process.cpp:1153] EXIT with status 1: Failed to
> obtain the IP address for '7c4beac7-5385-4dfa-845a-beb01e13c77c'; the DNS
> service may not be able to resolve it: Name or service not known{noformat}
> So I tried enforcing LIBPROCESS_IP using env variable but I saw Mesos
> overwrites it. So I rebuilt Mesos with additionnal debugging and here is the
> log:
> {noformat}
> Overwriting environment variable 'LIBPROCESS_IP' from '10.99.50.3' to
> '0.0.0.0'
> E0917 16:34:49.779429 31428 process.cpp:1153] EXIT with status 1: Failed to
> obtain the IP address for 'de65bbd8-b237-4884-ba87-7e13cb85078f'; the DNS
> service may not be able to resolve it: Name or service not known{noformat}
> According to the code, it's expected to be set to 0.0.0.0 (MESOS-5127). So I
> tried to understand why libprocess attempts to resolve a container run uuid
> instead of the hostname, here is libprocess code:
>
> {noformat}
> // Resolve the hostname if ip is 0.0.0.0 in case we actually have
> // a valid external IP address. Note that we need only one IP
> // address, so that other processes can send and receive and
> // don't get confused as to whom they are sending to.
> if (__address__.ip.isAny()) {
> char hostname[512];
> if (gethostname(hostname, sizeof(hostname)) < 0) {
> PLOG(FATAL) << "Failed to initialize, gethostname";
> }
> // Lookup an IP address of local hostname, taking the first result.
> Try<net::IP> ip = net::getIP(hostname, __address__.ip.family());
> if (ip.isError()) {
> EXIT(EXIT_FAILURE)
> << "Failed to obtain the IP address for '" << hostname << "';"
> << " the DNS service may not be able to resolve it: " << ip.error();
> }
> __address__.ip = ip.get();
> }
> {noformat}
>
> Well actually this is perfectly fine, except "gethostname" returns the
> container UUID instead of an valid host IP address. How is that even possible
> ?
>
> Any help would be greatly appreciated.
> Regards, Adam.
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