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Thread: Multi-server OSS for Shared Hardware.

  1. #1
    Join Date
    Sep 2005
    Buffalo, NY
    Rep Power

    Lightbulb Multi-server OSS for Shared Hardware.

    Okay before I get smacked for "why would you do that"...
    I am trying to get the most out of my hardware....

    Looked at:

    And here is my situation:
    I have 4 machines running Touchscreen kiosks. The minimum requirements for the kiosks is windows 98, 128 meg ram, pIII 600mhz.

    You cant GET machines that crappy new anywhere... so I got 4 Coreduo 2.0GHZ machines..... I want to use the extra processor time to run zimbra, as the touch screens are only used for "check in" between 9:30am -10:30am on sat, sun, wed and fri....but run 24-7.

    So I'm turning to RHEL 4 with Vmware...
    Native os on the machines is RHEL 4, with win98 running in VMware...
    no problems so far...

    I'm thinking i could breakup the responsibilities as illustrated in a Multiserver setup to these machines and use them to make 1 zimbra server.

    Limitations are: 256 meg memory and 50GB hard drive space per machine:

    Here is my thought:
    machine 1:

    machine 2 and 3:

    machine 4:

    1. We have Static outside IP, If I were doing this a single server,
    I would port forward:
    Remote Queue Manager:22
    Tomcat IMAP SSL:993
    Tomcat POP SSL:995
    Tomcat LMTP:7025
    in my router to the internal IP of the zimbra server... but since its now 3 peices on 4 machines, what ports do I forward to which machines?

    2. For possible IMAP/Pop3 users that are checking their mail via outlook, or palm versamail... can I just point mail server settings to the public ip/web address (with 2 mailstores) or do I have to have multiple external static ips(dns A records).

    3.Any suggestions/warnings/requirements that pertain to my situation other than what is here?:

  2. #2
    Join Date
    Sep 2005
    Buffalo, NY
    Rep Power

    Default Same Issue Thinking Differently

    Okay... I havent gotten a reply to this so I'm rethinking the issue, and squeezing blood (money) from the stone (not-for-profit organization)

    I got them to let me have one of the machines, with a promise they will fundraise for 4 real servers for email....

    Here are my revised questions with hope I can get a response before 10/20/2007 when thier old email provider annual contract ends.

    I have one machine: running RHEL 4. (2.5 GB RAM)
    on that machine I am running:
    Each machine has 256MB ram allocated, plus 50GB of hard drive allocated
    Installed First RHEL4 (domain
    Installed Second RHEL4 (logger on this one) RHEL4
    Installed Last RHEL4

    I have one static external internet IP I am working with and
    (dns A and mx records) point to that ip.

    1.Can I use port forwarding to these internal machines like i would with a single zimbra server or do I need to have multiple public IPs and have each machine outside?

    I ask this because one of the steps in setting up the server is to TURN OFF THE FIREWALL... and I was hoping to keep these machines "port forwarded" so they had a little bit of protection.
    Last edited by gfdos.sys; 10-18-2007 at 10:52 AM.

  3. #3
    Join Date
    Sep 2005
    Buffalo, NY
    Rep Power

    Arrow Necessity is the mother of Zimbrainvention

    This is what I have so far on portforwarding... but its still not perfect, because
    my users can receive incoming mail but cannot send out going mail:
    *Table borrowed from Zimbra Install Guide*

    The following ports are set as defaults when the Zimbra Collaboration Suite is installed.
    Table 1 Zimbra Port Mapping
    Service                  Port         PortForwarded to
    Remote Queue Manager     22 
    Postfix                  25 
    HTTP                     80 
    POP3                     110
    IMAP                     143
    LDAP                     389
    HTTPS                    443
    Tomcat IMAP SSL          993
    Tomcat POP SSL           995
    Tomcat LMTP              7025
    What am I missing?

  4. #4
    Join Date
    Jul 2007
    San Jose, CA
    Rep Power


    You have what I can only describe as a "creative" set-up that I would fear to try . . .

    However since you say everything is behaving except users sending mail, I'm going to guess that your problem is allowed networks (or rather lack thereof) in your MTA. Take a look at your settings in the admin GUI under Global Settings > MTA and look at what is in "MTA Trusted Networks."

    I have my Zimbra server in a DMZ and the addresses are DNAT/SNAT translated by my firewall, but I still have to allow the actual IP range of my clients, AS WELL AS any IPs that are masqueraded by any clients in the port forwarding setup. Missing either and some of my clients can't send mail.

    While you're at it, I would seriously consider upping the RAM allocations on whichever of your virtual machines is responsible for the Tomcat/Zimbra web interface hosting. You'll find significantly increased performance in the web clients if you do so. . .at least in my hardware-only box it made a huge difference when I went from 512 MB to 2 GB.

    Good luck!


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