Networker

Re: [Networker] Problem backing up a server with multiple IP addresses

2008-03-28 15:01:41
Subject: Re: [Networker] Problem backing up a server with multiple IP addresses
From: Tim Mooney <Tim.Mooney AT NDSU DOT EDU>
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Date: Fri, 28 Mar 2008 13:58:50 -0500
In regard to: Re: [Networker] Problem backing up a server with multiple IP...:

Here's what I get when I try a recover on this Linux client ...

[root@albatross logs]$ recover
Reverse DNS lookup failed for address 155.247.166.60
53362:recover: Cannot start session with server xxxx.ocis.temple.edu: RPC receive operation failed. A network connection could not be established with the host.

The 155.247.166.60 IP number is not the client's primary address. This client's primary address is 155.247.166.94.

Here's what happens with a server initiated backup ...

NetWorker savegroup: (alert) test2 completed, Total 1 client(s), 1 Failed. Please see group completion details for more information.

Failed: albatross

Start time:   Fri Mar 28 13:01:18 2008
End time:     Fri Mar 28 13:02:02 2008


--- Unsuccessful Save Sets ---

* albatross:All 5 retries attempted
* albatross:All 39078:savefs: SYSTEM error: Host name verification failed - unknown host: 155.247.166.60

We've had problems like this too.  It's not always clear from the
messages, but I would strongly suspect that the issue is that the *client*
cannot successfully do a reverse lookup for 155.247.166.60.

* albatross:All
* albatross:All 7183:savefs: Cannot access nsr server `xxxx'
* albatross:All savefs albatross: failed.
  * <ERROR> :  Failed with error(s)

All the usual network tests (traceroute, nslookup, reverse dns, all work fine between the NSR server and this client).

Yes, but I bet you only tested the primary client name and the primary
server name.  Try doing reverses for each of the client IP addresses.
Run this on the client:

for ip in `sed -ne 's/IPADDR=//p' /etc/sysconfig/network-scripts/ifcfg-*`
do
        dig +short -x "$ip"
done

That should be able to resolve all the IP addresses and turn them into
hostnames or FQDNs.  If you get any errors, that's where your problem is.

Tim
--
Tim Mooney                                        Tim.Mooney AT ndsu DOT edu
Information Technology Services                   (701) 231-1076 (Voice)
Room 242-J6, IACC Building                        (701) 231-8541 (Fax)
North Dakota State University, Fargo, ND 58105-5164

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