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Awards !!

Si te gusta lo que haces sigue haciéndolo y de momento sin buscar mucho el éxito. Pero no te duermas demasiado. El éxito no es un regalo para el que se entretiene buscando la solución perfecta. La suerte y las influencias tienen mucho que ver. Acaso no conoces algún ejemplo ?. Pues eso, sigue, y sobre todo intenta ser feliz. No tendrás mucho mas tiempo si quieres serlo, y sobretodo si buscas el premio. Pero nunca abandones. Cualquier día hasta te sorprendes. Seguro que está cerca  pero a lo mejor ocurre que todavía no te has dado cuenta.
cba

Vd. puede comentar, publicar, mejorar, desarrollar, … todo el contenido del blog.

No se olvide de citar a la persona o personas que han trabajado de forma desinteresada,  y por algo que puede ser de su interés. Todo el contenido del blog está a su entera disposición, y  siempre que no se olvide de ciertas libertades expresadas de forma fantástica por la FSF (Free Software Foundation) y especialmente por el Dr. Richard Stallman. Nunca las olvide. Se las recordamos a continuación:

___________________________________________________________________________

Libertad 0 –> Usar el software para sus propositos.

Libertad 1 –> Examinar y Modificar el software para ajustarlo a sus necesidades.

Libertad 2 –> Distribuir el software.

Libertad 3 –> Distribuir sus modificaciones como aporte a la comunidad.

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Richard_Stallman

emacs Stallman y Carlos

Stallman en la Guardia

Compartiendo Buenos Libros

— Nadie dice que sus aportaciones sean gratuitas. El mercado es libre también, … —

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Un antiguo filosofo griego decía que:  “Todo fluye, nada permanece“. Pensamos que lo único que permanece es:  la indiferencia y la falta de motivación e interés.

Es obvia la declinación de nuestra responsabilidad ante su Desastre,  y si no interpreta adecuadamente lo expuesto. Nunca mas lejos de nuestra intención. En cualquier caso “good luck”.

Happy Hacking,

(c) 2020 by carlos briso.

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Certificación Fecha Código de verificación Estado Fecha de caducidad
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4 comentarios en “Acerca de:

  1. Shenouda Tawfeek

    Dear.
    Many thanks for your awesome site
    I am interested in odoo
    And I followed your steps at
    Odoo&oq 12 pacemaker ha services
    And drbd
    I noted that there is missing articles I can’t found in the site
    For Instance the series started with
    No 1
    2
    3
    4
    5 and 6 and 8 are missing
    And at the end I see
    90
    Which is talking about previous articles where I can’t found in the site
    Plz if it possible guide me to the complete series to understand
    Many thanks

    Responder
    1. admin Autor

      Hi,

      I currently no longer use DRBD. Now I use GlusterFS. The complete sequence is the one corresponding to version 3.2. I use 9x, for addenda, or general aspects.

      Thanks for your interest,
      cba

      Responder
      1. Shenouda Tawfeek

        thanks a lot
        i follow your guide
        and i am using ubuntu20
        when i install postgresql
        and stop its service to be controlled via the pacmaker
        i faced that error
        Error: /srv/repVol-01/pgsql/data is not accessible or does not exist

        its looks that the cluster is starting the postgresql service befoure gluster-fuse mountig service
        so postgresql is not run
        so to make it run . when i make resource clear or restart postgresql manulaly after the mounting process happen
        But this against the idea of auotmation that cluster can provide
        if i miss some thing please guide me
        best regards

        Responder
        1. admin Autor

          Hello,
          I don’t really know your name. But my name is ‘Carlos’.
          You are absolutely right in what you say. Perhaps I have not made clear the main aspect of the subject.
          In any FS replication system, there must be an arbitration, and / or a quorum.
          In this simulation exercise, pacemaker does his job, but it is not enough. A minimum quorum is half plus one, and that with respect to pacemaker and also analyzing the even or odd servers. The two-node only formula works in a limited way. That is used for very poor resources. Not for lockd (I don’t use it anymore). DRBD (I don’t use it anymore, due to its high cost) or glusterd.
          If you get lost, your data will conflict and it will be difficult to recover them. A safe split-brain. And there are several types, … Better to avoid them! FUSE was an impossible paradox a short time ago. Everything should happen and be managed by the kernel. It is a different and new user space. And it works now at last! (versus> kernel 5.8.x Linus Torvalds).
          The main solution is to use a minimum of three servers from a GlusterFS point of view. The third can be an arbitrator of metadata and file names. In production, I would use real data servers, never a third party for metadata (referee). The cost is really irrelevant.
          The postgresql issue is different in a cluster. If there is not enough quorum, glusterd will break your BB. by DD. But you can use PAF. In the latter case, it would be necessary to change the configuration of the bricks in glusterFS so that postgresql could identify the read marks per server. But then the bricks should be identified in a different way and by each server and I reiterate, and to maintain a GFID consistency. This way it will work for sure.
          However, I have preferred to use a lower level and based on low-level attributes so that GlusterFS itself avoids splits-brains.
          I haven’t used Debian / Ubuntu for a long time. I prefer a configuration destined for the ad-hoc configuration file. And the SELinux environment is important too!
          CentOS / RedHat meets those expectations (Ubuntu / Debian too, but I use another system). Debian / Ubuntu helper tools make you lose perspective.
          Very good your questions!
          Nice to help you, or to help me!

          Best regards,

          carlos

          Responder

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