2 linux server and LOAD BALANCING & HIGH AVAILABILITY

[Chaneque]

Hello, I have 2 servers with redhat Enterprise IS. I need have LOAD BALANCING & HIGH AVAILABILITYY in both servers and to handle plesk. Some idea, or where to begin to investigate.

thanks

 

[sieb@]

Plesk Expand...

PSA itself is not built for clustering without alot of work. ART is the only person I know that has pulled it off, but then again, hes a creator of PSA.. Two server load balancing would actually require three servers. Search the forum.

 

[hardweb]

Plesk does not imposes additional problems to a HA project, but it does not make the life easier. I recommend you to consider a shared disk project like DRBD as its extremely complicated to implement and does not involve large costs.

 

[atomicturtle]

One interesting project perlboy pointed me to the other day is openssi.org, which abstracts away multiple physical servers into one virtual server. 2 systems probably wouldnt be enough for something like that (4 is probably a good start), but in terms of integration with psa, I set up an 8 node system running rh9/GFS and PSA installed just like a normal box. Nothing special required, I just installed psa like normal.

 

[sieb@]

One thing I have been toying with is since I am virtualizing all my hosting servers to VMWare GSX server, I can share a physical disk between the servers per their clustering how-tos. That along with multiple interfaces that can talk over their own internal swich, can make for a nice HA cluster. Only thing I'd worry about is getting MySql to sync nicely, its something I haven't messed with yet.

 

[atomicturtle]

yeah I've done a lot of clusters that way, where the physical servers each have a standalone OS and then you glue the whole thing together with LDAP, NFS and sqlrelay. Its always been a major hassle to set up and maintain. It is doable though, you've just got to run a really tight ship on the way each node is set up.