Multiserver clarifications

Discussion in 'General' started by jmhoms, Mar 18, 2010.

  1. jmhoms

    jmhoms New Member

    OK, thank you for all the clarifications, now i have a perfect idea of how it works and i'm ready to test and deploy.

    Congratulations and best whishes to the project.
     
  2. esmiz

    esmiz New Member

    Multiserver mirror system. Is this a valid way?

    Hello

    First of all, I want to thank jmhoms & till, for such an interesting post.
    It's being a great help to understand the multiserver behaviour.

    I've being testing 3.02, and just set up a couple of servers: one master, and one slave that mirrors it. I'm using 2 failover ips on the master to hold the domains, websites and mail accounts.
    So, I just have to duplicate website contents and databases in the slave, keep them synced, and I can survive a server crash. Well, this is ok, but this way slave does nothing, is just master the one is working, isn't it?

    As I was not 100% happy, I forwarded one of the failover ips to the slave server to see if it could handle some work, and this is what happened:

    1- In the slave, apache just showed one of the websites of its new ip, but I got it fixed after adding a new vhost by hand with some NameVirtualHost directives.

    2- Emails sent to the slave got bounced. This was harder to beat, but after much messing around I saw how..., editing all mysql files in the /etc/postfix folder, and changing server_id = 2, with server_id = 1, solved it.

    Apart from these 2 already solved problems, all the rest of the services dns, mysql, ftp, were working without hassle, so this looked like a better solution than having the master doing all the job.

    This is the first multiserver I've ever built, and to be honest I was convinced that it was going to fail at any time. I would not be surprised if anything breaks or was already broken. Keep on testing I found out that I can put back the ip failover in the master, or even put both failovers in the slave and everything still works beautifully.

    This exactly behaviour is what I've been up to for some time, it cover all my needs, and I'd like to use it as it is, if someone with enough knowledge confirm is harmless.
    I don't know how safe or reliable this setup can be, being used in this way, so any answer or comment will be much appreciated.

    Regards
     
  3. bajodel

    bajodel New Member

    ..this entire post is extremely intresting..

    Soon as possible i'll try to test multi-server features.. and i'm really intrested in a "esmiz scenario" ..it would be extremely usefull to have also the CP on the 'mirror/slave' in order to (eventually) manually promote the mirror to be the master (in emergency).

    bye..

    bajodel
     
  4. till

    till Super Moderator Howtoforge Staff HowtoForge Supporter ISPConfig Developer

    You can not have a controlpanel interface on the slave, it will destroy the data integrity of the replication. Additionally the slave has not all the data that is needed to run the master, so if you would login to to a controlpanel on the slave, there will be no clients and resellers available.
     
    Last edited: Apr 4, 2010

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