--- Manh Cuong <[EMAIL PROTECTED]> wrote:
> vay thi kho' qua', con cach nao don gian hon khong
> Bien ?
>
> bay gio truoc het lam sao cho hai server no' lien
> lac voi nhau de server nay chet toi thi` server kia
> thay the.
> tai. chua lam bao gio nen cung khong hieu la minh
> dang noi cai gi nua :(
>
Vie^'t la.i dda^`u ba`i mo^.t chu't:
Ca^`n thie^'t la^.p mo^.t he^. tho^'ng sa(~n sa`ng
cao, trong ddo' co':
- Servers: 2 hoa(.c nhie^`u ho+n cha.y o+? che^' ddo^.
active/standby, ta.i mo^.t tho+`i ddie^?m chi? co'
mo^.t server phu.c vu. clients, phu.c vu. mo^.t loa.i
di.ch vu. gi` ddo' du+.a tre^n ne^`n TCP/IP. Ca'c
server na`y se~ su+? du.ng chung mo^.t hostname/ip duy
nha^'t dde^? client no^'i to+'i, co' the^? go.i la`
server a?o cha(?ng ha.n
- Client: chi? ca^`n bie^'t mo^.t hostname/ip cu?a
server a?o dde^? no^'i to+'i, co`n thu+.c su+. server
va^.t ly' na`o phu.c vu. no' thi` no' kho^ng quan ta^m
- Mu+'c ddo^. dda'p u+'ng:
+ Phi tra.ng tha'i (stateless): clients lu'c na`o
ca^`n thi` no^'i, ddang no^'i ma` bi. ho?ng thi` no^'i
la.i cu~ng ddu+o+.c, kho^ng sao,vi' du.: nhu+ browser
no^'i va`o ca'c web server chi? co' ca'c trang web
ti~nh. Du`ng DNS Round-Robin la` dda~ co' the^? la`m
ddu+o+.c chuye^.n na`y ro^`i (mu+'c naming), cao ca^'p
ho+n thi` co' the^? thie^'t la^.p load balancing
(mu+'c IP)
+ Theo tra.ng tha'i (statefull); clients ma` ddang
ke^'t no^'i, ne^'u ho?ng pha?i switch toa`n bo^.
tra.ng tha'i cu?a session ddo' sang ma'y kha'c mo^.t
ca'ch tu+. ddo^.ng dde^? client kho^ng bi. ma^'t
session ddo'. Ca'ch na`y pha?i dda?m ba?o ddu+o+.c
ca'c co+ che^' ve^` switch IP, du+~ lie^.u pha?i
ddu+o+.c chia se?, du`ng chung (chu+' kho^ng pha?i la`
ddo^`ng bo^.) va` pha?i co' co+ che^' kie^?m soa't
tra.ng tha'i cu?a ca'c server (dda?m ba?o chi? co' 1
server thu+.c su+. phu.c vu. ngu+o+`i du`ng, tra'nh
chuye^.n tranh cha^'p ta`i nguye^n:
storage/ip/hostname...), dda^y la` li~nh vu+.c ma`
nhu+~ng tha(`ng nhu+ ServiceGuard for Linux cu?a HP
hay LifeKeeper cu?a Steeleye co' the^? la`m ddu+o+.c.
- Ta^'t ca? dde^`u phu. thuo^.c va`o dda(.c ti'nh cu?a
u+'ng du.ng nu+~a, co' loa.i ba('t buo^.c pha?i theo
tra.ng tha'i ke^'t no^'i, co' loa.i kho^ng.
Va^.y Cu+o+`ng ca^`n co+~ na`o ?? ro^`i sau ddo' mo+'i
ti`m gia?i pha'p dda'p u+'ng cho+'
Bie^n
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