High availability tips & ideas

[George Daflidis-Kotsis]

On Wed, Feb 19, 2003 at 12:13:04AM +0200, V13 wrote:

> On Tuesday 18 February 2003 11:39, Σταμάτης Κεκές wrote:
> >  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.
> 
> Xoris na exo asxolithei me to thema pistevo oti kati tetoio einai adynato. 
> Efoson o kathe ftpd trexei topika sto kathe mixanima tote den arkei apla na 
> metaferthei h syndesi sto allo mixanima, alla prepei na metaferthei kai h 
> esoteriki 'katastasi' toy ftpd (diladi olo to process)... Kati tetoio 
> **isos** na mporei na ginei me kapoio parallilo systima typoy mosix opoy an 
> psofisei ena mixanima ta processes ta opoia toy exoyn stalei na ektelese den 
> xanontai alla kai ekei yparxei ena kentriko systima apo to opoio 
> eksartasai...

Wpa, miso giati den dieukrinisthke kati e3arxhs:

Egw auto pou katalaba einai pws o Stamaths exei:


                                 switch

                  Load-balancer-1      Load-alancer-2
                     (active)            (standby)


        ftp-server-1    ftp-server-2   ftp-server-2   ftp-server-N


Opote skotwneis ton active kai kanei takeover o standby.

To ftp server farm apo pisw einai zwntano sto sunolo.

Ta katalaba swsta?

An auto pou ennoouse o Stamaths pws psofaei einai enas ftp server, sumfwnw,
den mporei na metafernei to connection se kapoio allo ftp server.

Filika.

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