David Fraser's questions

I'd like to use ssh's ControlMaster feature to share connections for speed increases. I'm trying to script it so that I can start/restart/stop a number of connections to different hosts.

How can I determine whether any of these connections are in use? If I kill them when an ssh session is open, it gets closed

My restart script would ideally look like (pseudo-script) - the stop script would be equivalent without the ssh command at the bottom:

for HOST in $HOST_LIST
  do
    MASTER_PID=`find_master_pid $HOST`
    if $MASTER_PID
      then
        if `find_child_pid`
          echo Connection to $HOST in use: not terminating
        else
          kill -SIGHUP $MASTER_PID
        fi
    ssh -TMNf $HOST

We have a mail server running Zimbra (ZCS 6.0.8). The server has 5 active public IP addresses in the same subnet. (.226-.230). I currently have A records for each of these (host0.domain.com..host4.domain.com), with the main host.domain.com of the machine pointing to .226.

Our host has ended up being listed on the SORBS DUHL list (even though it's in a server farm). According to them you can get removed quickly by checking that your host has an MX record, an A record, and a PTR record that points back to the hostname given in the MX record.

I tried setting the PTR records so that each of these addresses resolved back to their A record (i.e. .228 had a PTR to host2.domain.com). However, I then got mail being rejected from other servers because when Postfix (under Zimbra control) sends out mail, it uses the main hostname for the HELO - there doesn't seem to be any way to override it. So the PTR records currently say host.domain.com for all 5 IP addresses.

What's the correct way to handle this? Should I have an A record for the domain that points to all the IP addresses (for round-robin handling)? I'm nervous of changes that could cause problems, so I'm wondering what the standard way to handle a multiple-IP-address mail server is.

I have a Windows Server 2008 machine running in VirtualBox. On initial installation, only one processor was made available, but now I want to run it as a multiprocessor machine.

I have made all four cores available in the VirtualBox settings (as well as enabling VT-x/AMD-V and Nested Paging), but Task Manager still only shows one CPU. However, the four CPU cores are visible in Device Manager under Processors.

In the event log on startup, I can see the following relevant events:

EventLog.6009 Microsoft (R) Windows (R) 6.00.6002 Service Pack 2 Multiprocessor Free
Kernel-Processor-Power.4 Processor 0 exposes the following: 1 idle state(s), 0 performance state(s), 0 throttle state(s)
Kernel-Processor-Power.4 Processor 255 exposes the following: 0 idle state(s), 0 performance state(s), 0 throttle state(s)
Kernel-Processor-Power.4 Processor 255 exposes the following: 0 idle state(s), 0 performance state(s), 0 throttle state(s)
Kernel-Processor-Power.4 Processor 255 exposes the following: 0 idle state(s), 0 performance state(s), 0 throttle state(s)

How can I make this system actually boot up as a multiprocessor machine?

On our Zimbra 6.0.5 server running on Fedora 6, it seems that all messages are being tagged by spamassassin with NO_DNS_FOR_FROM (despite having legitimate sent addresses).

How should I debug this? It started happening today...

Example header:

Return-Path: [email protected]
Received: from zzzzzz.yyyyyy.com (LHLO zzzzzz.yyyyyy.com) (NN.NNN.NN.NN) by
 zzzzzz.yyyyyy.com with LMTP; Wed, 1 Sep 2010 07:10:44 -0500 (CDT)
Received: from localhost (localhost.localdomain [127.0.0.1])
 by zzzzzz.yyyyyy.com (Postfix) with ESMTP id 84983B90D2D
 for ; Wed,  1 Sep 2010 07:10:42 -0500 (CDT)
X-Virus-Scanned: amavisd-new at zzzzzz.yyyyyy.com
X-Spam-Flag: NO
X-Spam-Score: -1.851
X-Spam-Level: 
X-Spam-Status: No, score=-1.851 tagged_above=-10 required=3.2
 tests=[AWL=-0.748, BAYES_00=-2.599, NO_DNS_FOR_FROM=1.496]
 autolearn=no
Received: from zzzzzz.yyyyyy.com ([127.0.0.1])
 by localhost (zzzzzz.yyyyyy.com [127.0.0.1]) (amavisd-new, port 10024)
 with ESMTP id 7rHCzaW15+sm; Wed,  1 Sep 2010 07:10:37 -0500 (CDT)
Received: from dm-mailman01.mozilla.org (mail.mozilla.org [63.245.208.162])
 by zzzzzz.yyyyyy.com (Postfix) with ESMTP id 0389EB90D24
 for ; Wed,  1 Sep 2010 07:10:37 -0500 (CDT)
Received: from dm-mailman01.mozilla.org (localhost.localdomain [127.0.0.1])
 by dm-mailman01.mozilla.org (Postfix) with ESMTP id 6F52D93E596
 for ; Wed,  1 Sep 2010 05:10:31 -0700 (PDT)
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From: [email protected]
To: [email protected]
X-No-Archive: yes
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Date: Wed, 01 Sep 2010 05:09:29 -0700
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