High availability tips & ideas

[George Daflidis-Kotsis]

On Tue, Feb 18, 2003 at 11:39:06AM +0200, Σταμάτης Κεκές wrote:

> Geia xara se olous kai oles sti lista!
> Edo kai kamposo kairo thelo na stiso ena cluster me 2 web servers opou 
> tha exoun kai ftp epano tous gia to upload.
> esto loipon oti o enas exei tin IP 10.0.0.2/24 kai o allos tin 
> 10.0.0.3/24 kai i floating IP einai i 10.0.0.4/24.

Giati enw les IP perigrafeis ena /24 network?

> Mexri stigmis xrisimopoiontas to heartbeat katafera na apo tin proti 
> stigmi na exo mai floating IP kai ola ta requests http kai ftp na 
> ftanoun ston server kai na douleyei mia xara.
> Otan omos erixna ton "active" server pethainan kai ta connections pou 
> eixe kai tin floating IP tin epairne o allos.
> To erotima mou einai to eksis:
> Ksereis kaneis i exei dei kaneis kapoio tropo na ginetai takeover 
> transparently diladi xoris na xathoun ta ftp connections ?
> Eyxaristo prokatavolika osous kai oses apantisoun.
> 
> P.S. Oi distro pou exo kaneis tis dokimes mou itan me RH 7.2 kai 8.0, 
> Debian Potato kai Woody kai me heartbeat oti teleytaio vrika sto 
> linux-ha.org.

Den 3erw an to heartbeat einai kapoio feature tou linux n' kapoio e3wteriko,
commercial, paketo pantws auto pou 8eleis na sumbainei einai na metaferetai
to pass state twn connections.

To floating IP 8a thn parei o standby server profanws, gi' auto einai
floating :-)

HTH.

-- 
[george daflidis-kotsis - systems admin,web/e-commerce - gdk at demon.net]