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https://issues.apache.org/jira/browse/CLOUDSTACK-107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13456409#comment-13456409
]
Mice Xia commented on CLOUDSTACK-107:
-------------------------------------
[Root Cause]
When creating a VM with multiple NICs, each NIC acquired DNS server info from
their corresponding vRouter via DHCP; on CentOS, DNS and Search Domain are
written to /etc/resolve.conf, and command hostname --fqdn relies on this config
file to retrieve hostname.
As the VM boots, every time NIC gets activiated, DNS and search domain are
flushed into resolve.conf as a part of DHCP process. This will give the result
that the last NIC in boot sequence succeeds in writing these infos. DNS server
is already set to the one associated with default NIC for all NICs, but search
domain is not set in the same way. Finally the DNS comes from one vrouter
associated with default NIC while search domain may come from others.
One quick workaround is adding PEERDNS=no in the network config files for
non-default NICs on guest VM, this will prevent DHCP client from updating.
To solve this issue, modify DhcpEntryCommand and adding 'domain name' entry in
dhcpopts.txt can fix this. Not diffcult for coding but needs to test it on
other guest OS.
> Network domain guest suffix is not getting programmed as part of hostnames on
> Guest VMs that are part of Isolated and Shared Guest Networks
> -------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: CLOUDSTACK-107
> URL: https://issues.apache.org/jira/browse/CLOUDSTACK-107
> Project: CloudStack
> Issue Type: Bug
> Components: Management Server
> Affects Versions: pre-4.0.0
> Reporter: Chandan Purushothama
> Assignee: Mice Xia
> Fix For: 4.0.0
>
>
> ===========================================================
> Observations on the User VMs present on Isolated and Shared Guest Networks:
> ===========================================================
> **Observe the hostname --fqdn Information on the Guest VMs **
> [root@atoms-regnet-shdnet-vm2 ~]# ip route
> 10.223.137.128/26 dev eth1 proto kernel scope link src 10.223.137.133
> 10.1.1.0/24 dev eth0 proto kernel scope link src 10.1.1.134
> 169.254.0.0/16 dev eth1 scope link
> default via 10.1.1.1 dev eth0
> [root@atoms-regnet-shdnet-vm2 ~]# ifconfig
> eth0 Link encap:Ethernet HWaddr 02:00:59:14:00:03
> inet addr:10.1.1.134 Bcast:10.1.1.255 Mask:255.255.255.0
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:8463 errors:0 dropped:0 overruns:0 frame:0
> TX packets:8676 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:7452424 (7.1 MiB) TX bytes:639913 (624.9 KiB)
> eth1 Link encap:Ethernet HWaddr 06:F8:3E:00:00:2C
> inet addr:10.223.137.133 Bcast:10.223.137.191 Mask:255.255.255.192
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:16260 errors:0 dropped:0 overruns:0 frame:0
> TX packets:30005 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:1080956 (1.0 MiB) TX bytes:7215858 (6.8 MiB)
> lo Link encap:Local Loopback
> inet addr:127.0.0.1 Mask:255.0.0.0
> UP LOOPBACK RUNNING MTU:16436 Metric:1
> RX packets:87 errors:0 dropped:0 overruns:0 frame:0
> TX packets:87 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:12034 (11.7 KiB) TX bytes:12034 (11.7 KiB)
> [root@atoms-regnet-shdnet-vm2 ~]# ip route
> 10.223.137.128/26 dev eth1 proto kernel scope link src 10.223.137.133
> 10.1.1.0/24 dev eth0 proto kernel scope link src 10.1.1.134
> 169.254.0.0/16 dev eth1 scope link
> default via 10.1.1.1 dev eth0
> [root@atoms-regnet-shdnet-vm2 ~]# hostname
> atoms-regnet-shdnet-vm2
> [root@atoms-regnet-shdnet-vm2 ~]# hostname --fqdn
> hostname: Unknown host
> [root@atoms-regnet-shdnet-vm2 ~]# cat /etc/hosts
> # Do not remove the following line, or various programs
> # that require network functionality will fail.
> 127.0.0.1 localhost.localdomain localhost
> ::1 localhost6.localdomain6 localhost6
> [root@atoms-regnet-shdnet-vm2 ~]# exit
> logout
> Connection to 10.223.137.133 closed.
> [root@atoms-shdnet-regnet-vm3 ~]#
> [root@atoms-shdnet-regnet-vm3 ~]#
> [root@atoms-shdnet-regnet-vm3 ~]#
> [root@atoms-shdnet-regnet-vm3 ~]# ifconfig
> eth0 Link encap:Ethernet HWaddr 06:15:2E:00:00:2A
> inet addr:10.223.137.131 Bcast:10.223.137.191 Mask:255.255.255.192
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:49444 errors:0 dropped:0 overruns:0 frame:0
> TX packets:35070 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:15282991 (14.5 MiB) TX bytes:6945191 (6.6 MiB)
> eth1 Link encap:Ethernet HWaddr 02:00:1B:9C:00:04
> inet addr:10.1.1.175 Bcast:10.1.1.255 Mask:255.255.255.0
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:129 errors:0 dropped:0 overruns:0 frame:0
> TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:6119 (5.9 KiB) TX bytes:768 (768.0 b)
> lo Link encap:Local Loopback
> inet addr:127.0.0.1 Mask:255.0.0.0
> UP LOOPBACK RUNNING MTU:16436 Metric:1
> RX packets:83 errors:0 dropped:0 overruns:0 frame:0
> TX packets:83 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:11602 (11.3 KiB) TX bytes:11602 (11.3 KiB)
> [root@atoms-shdnet-regnet-vm3 ~]# ip route
> 10.223.137.128/26 dev eth0 proto kernel scope link src 10.223.137.131
> 10.1.1.0/24 dev eth1 proto kernel scope link src 10.1.1.175
> 169.254.0.0/16 dev eth1 scope link
> default via 10.223.137.129 dev eth0
> [root@atoms-shdnet-regnet-vm3 ~]# hostname
> atoms-shdnet-regnet-vm3
> [root@atoms-shdnet-regnet-vm3 ~]# hostname --fqdn
> hostname: Unknown host
> [root@atoms-shdnet-regnet-vm3 ~]#
> =========================================
> Database Information pertaining to the Guest Networks:
> =========================================
> mysql> select * from networks where id in (204,205) \G
> *************************** 1. row ***************************
> id: 204
> name: TestNetwork-atoms
> uuid: 6ebeed0b-7de9-4d7c-a00e-03b6ec134bd9
> display_text: TestNetwork-atoms
> traffic_type: Guest
> broadcast_domain_type: Vlan
> broadcast_uri: vlan://2485
> gateway: 10.1.1.1
> cidr: 10.1.1.0/24
> mode: Dhcp
> network_offering_id: 8
> physical_network_id: 200
> data_center_id: 1
> guru_name: ExternalGuestNetworkGuru
> state: Implemented
> related: 204
> domain_id: 1
> account_id: 3
> dns1: NULL
> dns2: NULL
> guru_data: NULL
> set_fields: 0
> acl_type: Account
> network_domain: atoms.lab.vmops.com
> reservation_id: 90d524f0-6397-4ecf-80ba-c9891e0fb551
> guest_type: Isolated
> restart_required: 0
> created: 2012-09-12 00:59:37
> removed: NULL
> specify_ip_ranges: 0
> vpc_id: NULL
> *************************** 2. row ***************************
> id: 205
> name: SharedNetwork-All
> uuid: a06fcc28-4a82-403b-a5c1-63650f89fc96
> display_text: SharedNetwork-All
> traffic_type: Guest
> broadcast_domain_type: Vlan
> broadcast_uri: vlan://1372
> gateway: 10.223.137.129
> cidr: 10.223.137.128/26
> mode: Dhcp
> network_offering_id: 7
> physical_network_id: 200
> data_center_id: 1
> guru_name: DirectNetworkGuru
> state: Setup
> related: 205
> domain_id: 1
> account_id: 1
> dns1: NULL
> dns2: NULL
> guru_data: NULL
> set_fields: 0
> acl_type: Domain
> network_domain: shdntwkall1.lab.vmops.com
> reservation_id: NULL
> guest_type: Shared
> restart_required: 0
> created: 2012-09-12 21:45:58
> removed: NULL
> specify_ip_ranges: 1
> vpc_id: NULL
> 2 rows in set (0.00 sec)
> mysql>
> ==========================================================================
> On a VM present on Regular Isolated Network alone, which is created from
> DefaultNetworkOfferingWithSourceNATServiceEnabled, the hostname has the guest
> domain suffix as expected:
> ==========================================================================
> [root@atoms-regnet-vm1 ~]# ifconfig
> eth0 Link encap:Ethernet HWaddr 02:00:46:34:00:01
> inet addr:10.1.1.41 Bcast:10.1.1.255 Mask:255.255.255.0
> UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> RX packets:11721 errors:0 dropped:0 overruns:0 frame:0
> TX packets:11697 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:1000
> RX bytes:8753984 (8.3 MiB) TX bytes:842033 (822.2 KiB)
> lo Link encap:Local Loopback
> inet addr:127.0.0.1 Mask:255.0.0.0
> UP LOOPBACK RUNNING MTU:16436 Metric:1
> RX packets:112 errors:0 dropped:0 overruns:0 frame:0
> TX packets:112 errors:0 dropped:0 overruns:0 carrier:0
> collisions:0 txqueuelen:0
> RX bytes:16119 (15.7 KiB) TX bytes:16119 (15.7 KiB)
> [root@atoms-regnet-vm1 ~]#
> [root@atoms-regnet-vm1 ~]# hostname --fqdn
> atoms-regnet-vm1.atoms.lab.vmops.com
> [root@atoms-regnet-vm1 ~]# cat /etc/hosts
> # Do not remove the following line, or various programs
> # that require network functionality will fail.
> 127.0.0.1localhost.localdomain localhost
> ::1localhost6.localdomain6 localhost6
> [root@atoms-regnet-vm1 ~]# ip route
> 10.1.1.0/24 dev eth0 proto kernel scope link src 10.1.1.41
> 169.254.0.0/16 dev eth0 scope link
> default via 10.1.1.1 dev eth0
> [root@atoms-regnet-vm1 ~]#
> =======
> Git Info:
> =======
> Git Revision: 03df2fa9dd45c938f72cd1866044b09d1b0cc978
> Git URL: https://git-wip-us.apache.org/repos/asf/incubator-cloudstack.git
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