Regards,
Miguel
Dear all,
We have a web application served by Apache with Tomcat behind for the JSPs. The database backend is PostgreSQL. I have been asked to do some
research about how to achieve fail tolerance and load balancing in our application. After searching a little bit this is my first impression:
- There are integrated software for high availability using PostgreSQL (i.e.: eRserver) but have commercial licences (you have to pay a lot for it).
- There are some efforts for developing GPL application to achieve replication, or load balancing or even clustering. My impression is that they are in a earlier stage, but some of them look promising. Anyway I am not very sure if any of them will suit into my setup (like pgcluster or dbmirror).
What I have thought that in my setup maybe I just need to do clustering with servers with the same setup: Apache/Tomcat. Then, just do some sort of replication between the PostgreSQL databases that every node of the cluster should have (i dont know which is the best GPL replication software). Even I thought that maybe I could use some sort of dns round- robin approach for load balancing for Apache.
Anyway as you can see I´m pretty lost and I need some guidance to put me in the right direction...
Sorry for my English
Many thanks in advance
Miguel
Se que en Bulma sois mas forofos de MySQL que de PostgreSQL por vuestras experiencias con la web de bulma, pero tengo que hacer un estudio para usar PostgreSQL en un entorno donde se necesita balanceo de carga y tolerancia a fallos.
Realmente lo que tenemos es una aplicacion web, con Apache y Tomcat como servidores de JSPs cuya base de datos es PostgreSQL, digo esto porque he pensado que tal vez lo de buscar un sistema de alta disponibilidad para PostgreSQL no sea necesario para este sistema, y simplemente lo que podria hacerse seria un cluster con Apache, o incluso utilizar un algoritmo round-robin que vaya pasando las solicitudes a los distintos servidores y un sistema de mirroring entre los distintos servidores PostgreSQL.
He estado mirando en la página web de PostgreSQL y navegando un poco, y veo que hay alternativas que ofrecen alta disponibilidad (tolerancia a fallos, balanceo y replicacion), pero de pago.
Como os digo se me ocurre a priori este enfoque que os digo, ya que realmente solo hay una base de datos que mantener sincronizada (creo que esto se puede hacer con dbmirror aunque no se si es solo a nivel de tablas o de bases de datos).
Tambien he visto una herramienta llamada pgcluster. La verdad estoy un poco perdido, alguien me puede echar un cable?
Un saludo
Miguel
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