[Bugs] [Bug 1750265] New: configure name server in host will cause command hanging

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1750265

            Bug ID: 1750265
           Summary: configure name server in host will cause command
                    hanging
           Product: GlusterFS
           Version: 4.1
            Status: NEW
         Component: cli
          Assignee: bugs at gluster.org
          Reporter: wabp2005 at 126.com
                CC: bugs at gluster.org
  Target Milestone: ---
    Classification: Community



Description of problem:


Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1.add nameserver in file "/etc/resolv.conf"
2.execute cli command "gluster volume heal storage info split-brain"
3.cli command will hang some secends, this depends on how much nameserver you
config on host

Actual results:
# time gluster volume heal storage info split-brain
Brick 192.168.2.5:/.storage
Status: Connected
Number of entries in split-brain: 0

Brick 192.168.2.6:/.storage
Status: Connected
Number of entries in split-brain: 0


real    0m45.451s
user    0m0.044s
sys     0m0.027s


Expected results:
sbg_SC-1:~ # time gluster volume heal storage info split-brain
Brick 192.168.2.5:/.storage
Status: Connected
Number of entries in split-brain: 0

Brick 192.168.2.6:/.storage
Status: Connected
Number of entries in split-brain: 0


real    0m0.699s
user    0m0.058s
sys     0m0.011s


Additional info:
according to the tcpdump, I found glusterfs will always send DNS query to the
nameserver configure in host, the query name is "/var/run/glusterd.socket", I
think this cause cli command hangs.

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