Open Stack

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The instances in openstack are running and I can ssh using the public
address (cactus release). Today I noticed, the vms cannnot connect to
the outside world properly. I don't recall this happening before. The
issue seems to be with name resolution. I can ping fine using the ip
addresses.


$ ssh -i natty2.pem root at xxx.xxx.xx.xxx
Welcome to Ubuntu 11.04 (GNU/Linux 2.6.38-11-virtual x86_64)

Last login: Fri Oct  7 14:17:47 2011 from 129.79.49.229
root at i-000003e4:~# ifconfig eth0
eth0      Link encap:Ethernet  HWaddr 02:16:3e:27:5a:da
          inet addr:10.0.1.7  Bcast:10.0.1.255  Mask:255.255.255.0
          inet6 addr: fe80::16:3eff:fe27:5ada/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3995 errors:0 dropped:0 overruns:0 frame:0
          TX packets:494 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:654810 (654.8 KB)  TX bytes:67031 (67.0 KB)
          Interrupt:11 Base address:0xa000

root at i-000003e4:~# ping www.google.com
ping: unknown host www.google.com
root at i-000003e4:~# ping 72.14.204.103
PING 72.14.204.103 (72.14.204.103) 56(84) bytes of data.
64 bytes from 72.14.204.103: icmp_req=1 ttl=54 time=32.3 ms
64 bytes from 72.14.204.103: icmp_req=2 ttl=54 time=32.4 ms
^C
- --- 72.14.204.103 ping statistics ---


# dig @10.0.1.1 google.com

; <<>> DiG 9.7.3 <<>> @10.0.1.1 google.com
; (1 server found)
;; global options: +cmd
;; connection timed out; no servers could be reached


# dig @8.8.4.4 google.com

; <<>> DiG 9.7.3 <<>> @8.8.4.4 google.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 977
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;google.com.			IN	A

;; ANSWER SECTION:
google.com.		300	IN	A	72.14.204.147
google.com.		300	IN	A	72.14.204.105
google.com.		300	IN	A	72.14.204.103
google.com.		300	IN	A	72.14.204.104
google.com.		300	IN	A	72.14.204.99

;; Query time: 36 msec
;; SERVER: 8.8.4.4#53(8.8.4.4)
;; WHEN: Fri Oct  7 14:39:00 2011
;; MSG SIZE  rcvd: 108


# cat /etc/resolv.conf
nameserver 10.0.1.1
domain novalocal
search novalocal

# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use
Iface
10.0.1.0        0.0.0.0         255.255.255.0   U     0      0        0 eth0
0.0.0.0         10.0.1.1        0.0.0.0         UG    100    0        0 eth0

When I add nameserver 8.8.4.4 in resolv.conf, I can ping them. Any idea?


- --sharif


- -- 
Sharif Islam
Senior Systems Analyst/Programmer
FutureGrid (http://futuregrid.org)
Pervasive Technology Institute, Indiana University Bloomington
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