Slow hostname resolution on fuel master

[Bartosz Kupidura]

During ssh from fuel master to nodes using names, ssh tries to resolves hostname->ip.

SSH tries to resolve hostname to IPv4 and IPv6.

Cobbler/dnsmasq knows only IPv4. IPv6 is forwarded to internet (google DNS).

In case where Fuel master dont have internet connection (ex. internal network), ssh will be slow.

DNSmasq logs:
Jan 13 14:07:00 dnsmasq[3860]: query[A] node-3.domain.tld from 172.17.42.1
Jan 13 14:07:00 dnsmasq[3860]: /var/lib/cobbler/cobbler_hosts node-3.domain.tld is 192.168.4.153
Jan 13 14:07:00 dnsmasq[3860]: query[AAAA] node-3.domain.tld from 172.17.42.1
Jan 13 14:07:00 dnsmasq[3860]: forwarded node-3.domain.tld to 8.8.8.8

Workaround for this is to force SSH to use only IPv4.

Patch: https://review.openstack.org/#/c/146839/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/146839
Committed: https://git.openstack.org/cgit/stackforge/fuel-library/commit/?id=45fcf34771613a0668a48ae0048efa0a72224330
Submitter: Jenkins
Branch: master

commit 45fcf34771613a0668a48ae0048efa0a72224330
Author: Bartosz Kupidura <email address hidden>
Date: Tue Jan 13 13:16:33 2015 +0100

    Force ssh client on fuel master to use IPv4

    Related-bug: #1410226

    Change-Id: Iaaaa3cf53d1c78484f49b07aeaa547e1cb7386b6

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: stable/6.0
Review: https://review.openstack.org/156687

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/156687
Committed: https://git.openstack.org/cgit/stackforge/fuel-library/commit/?id=8d37d08a99a8968765741398fb8bdfa72656f1fe
Submitter: Jenkins
Branch: stable/6.0

commit 8d37d08a99a8968765741398fb8bdfa72656f1fe
Author: Bartosz Kupidura <email address hidden>
Date: Tue Jan 13 13:16:33 2015 +0100

    Force ssh client on fuel master to use IPv4

    Related-bug: #1410226

    Change-Id: Iaaaa3cf53d1c78484f49b07aeaa547e1cb7386b6
    (cherry picked from commit 45fcf34771613a0668a48ae0048efa0a72224330)

[Maksym Strukov (unbelll)]

{"build_id": "2015-03-16_22-54-44", "ostf_sha": "e86c961ceacfa5a8398b6cbda7b70a5f06afb476", "build_number": "202", "release_versions": {"2014.2-6.1": {"VERSION": {"build_id": "2015-03-16_22-54-44", "ostf_sha": "e86c961ceacfa5a8398b6cbda7b70a5f06afb476", "build_number": "202", "api": "1.0", "nailgun_sha": "874df0d06e32f14db77746cfeb2dd74d4a6e528c", "production": "docker", "python-fuelclient_sha": "2509c9b72cdcdbe46c141685a99b03cd934803be", "astute_sha": "93e427ac49109fa3fd8b0e1d0bb3d14092be2e8c", "feature_groups": ["mirantis"], "release": "6.1", "fuelmain_sha": "608b72a6f79a719cf01c35a19d0091fe20c8288a", "fuellib_sha": "924d73ae4766646e1c3a44d7b59c4120985e45f0"}}}, "auth_required": true, "api": "1.0", "nailgun_sha": "874df0d06e32f14db77746cfeb2dd74d4a6e528c", "production": "docker", "python-fuelclient_sha": "2509c9b72cdcdbe46c141685a99b03cd934803be", "astute_sha": "93e427ac49109fa3fd8b0e1d0bb3d14092be2e8c", "feature_groups": ["mirantis"], "release": "6.1", "fuelmain_sha": "608b72a6f79a719cf01c35a19d0091fe20c8288a", "fuellib_sha": "924d73ae4766646e1c3a44d7b59c4120985e45f0"}

Verified in 6.1