Mumakombiyuta ekutengesa, CDN inomirira kana Content Delivery Network kana Content Distribution Network . CDN inoparadzirwa client / server system yakagadzirirwa kuvandudza kuvimbika nekushanda kwekushandisa kweInternet.
Nhoroondo yeCDNs
Zvakaburitswa Kuendesa Mitambo zvakatanga kugadzirirwa seWorld Wide Web (WWW) yakaputirwa mukuzivikanwa muma1999s. Vatungamiri veMagetsi vakaona kuti Indaneti haigoni kubata nehuwandu hwechikwata chekutengesa kwenzira pasina nzira dzakangwara dzekutarisira kuderera kwe data.
Yakatangwa muna 1998, Akamai Technologies ndiyo yekutanga kambani yekuvaka bhizimisi rekukomberedza maCDN. Vamwe vakatevedzana nezvidimbu zvakasiyana zvekubudirira. Gare gare, makambani akasiyana-siyana ekutengesa terevhizheni akadai AT & T, Deutsche Telekom, uye Telstra vakavaka maCDN avowo. Zviripo Kuendesa Mitambo mazuva ano zvinotakura chikamu chakakura cheWebhu zvakagadzirwa, kunyanya mafaira akadai semavhidhiyo uye zvinyorwa zvekushandisa. MaCDN ose ezvokutengeserana uye asingasviki aripo.
Kuti CDN Inoshanda Sei
Mumwe mupi weCDN anoisa mavharivha awo munzvimbo dzinonyanya kudarika Indaneti. Sirivha imwe neimwe inosanganisira yakawanda yekuchengetedzwa kwemunharaunda pamwe nekwanisi yekufananidza makopi ayo data nedzimwe mavhareji pahutano hwehutano kuburikidza nehutano hunonzi kudzokorora . Aya ma servers anoita se data caches. Kuti vawane zvinhu zvakachengetedzwa kune vatengi munyika yose zvakanyanya, vashandi veCDN vanoisa mavhareji avo munzvimbo dzakasiyana-siyana-dzakapararira "nzvimbo dzomumakomo" - nzvimbo dzinobatanidza zvakananga kuInternet backbone , kazhinji munzvimbo dzinochengetedza nzvimbo dziri pedyo neInternet Service Providers (ISPs) . Vamwe vanhu vanovatumidza kuti Point Of Presence (PoP) sevhisi kana kuti "makumbo makumbo" maererano.
Muparidzi anogadzirisa uyo anoda kugovera deta yavo neCDN vanyori nevanopa. Vakuru veNCDN vanopa vaparidzi kuti vauye kune server yavo iyo mavambo ezvinyorwa zvezvinhu zvinowanikwa (kazhinji mafaira kana mapoka emafaira) anogona kuiswa panzvimbo yekuparadzira uye caching. Vapiro vanotsigirawo URL kana zvinyorwa zvinoparidzirwa nevaparidzi munzvimbo dzavo kuti vataure kune zvinhu zvakachengetedzwa zvinhu.
Kana vashandisi veIndaneti (MaWebhusevhisi kana mamwe mapurogiramu akafanana) kutumira zvikumbiro zvezvakagadzirwa, muparidzi akagamuchira sevha inopindura uye inokonzera chikumbiro kumaseva eCDN sezvaanoda. Maseva eCDN anokodzera anosarudzwa kuti abudise zvinyorwa maererano nenzvimbo yemutengi. Iyo CDN inobudirira inounza dheedze pedyo neunokumbira kuti kuderedze kushanda kunodiwa kuitumira iyo paInternet.
Kana server yeCDN inokumbirwa kutumira chinhu chekugadzirisa asi isina chepi, ichaitawo, inokumbira mubereki weCDN imwechete. Mukuwedzera pakuendesa kopi kune munhu anenge akumbira, server yeCDN ichachengetedza (cache) kopi yayo kuitira kuti zvikumbiro zvechimwe chinhu chinotevera zvizadzike kunze kwekuda kubvunza mubereki zvakare. Zvinhu zvinodzingwa kubva pachidziro kana iyo sevha inoda kusunungura nzvimbo (iyo inonzi kudzingwa ) kana iyo chinhu chisina kukumbirwa kwenguva yakati (chirongwa chinonzi kukwegura ).
Makomborero eNyaya Inoburitsa Mitambo
CDNs pamwe chete vanobatsira, vaparidzi vehupenyu, uye vatengi (vashandisi) nenzira dzakasiyana-siyana:
- Vakuru vakakura vakaita saAkamai vakaita mabhizimusi makuru kubva kumaCDN, asi makambani maduku akabudirira zvakare. Izvi zvinoparidzirwa maitiro anobatsira kuderedza mutoro wepasi rose pasi paInternet, kuita kuti webhu inoshanda zvakanyanya kune wese wese.
- CDNs dzinogona kuvandudza unhu hwemuparidzi hwehutano. Nokuita kuti hukama hwavo huve nehuwandu hwekuteerera uye huwandu hwekutsvaga, vaparidzi vanowedzera kugutsikana kwevatengi vavo (uye vanowanzokwezva vamwe vatengi).
- Vashandi vekambani vanonakidzwa nekutsvaga zvakanyanya zvinyorwa zvakagadzirirwa neCDN zvakadai semavhidhiyo uye kazhinji kutaridzika kwepamusoro (lower network latency , nguva shomanana yokufamba rwendo) dzeIndaneti.
Matambudziko ane CDNs
Vashandi veCDN vanowanzobhadhara vatengi vavo maererano nehuwandu hwehutachiona hutachiona humwe hunogadzira kuburikidza nekushanda kwavo uye mabasa. Mitero inogona kuwedzera nokukurumidza, kunyanya apo vatengi vanobhadhara kumagadzirirwo emasangano uye vanopfuura kudarika kwavo. Kamwe kamwe-kamwe kunokonzerwa nemigwagwa inokonzerwa nezviitiko zvisingafananidzi zvevanhu uye zvezvinoitika, kana dzimwe nguva kunyange Kuramba kweShu (DoS) kurwiswa, kunogona kunge kunonetsa zvikuru.
Kushandisa CDN kunowedzera muparidzi wehupenyu kuvimba nemabhizimisi evanhu vatatu. Kana mupiro akawana nyaya dzehutano nehutano hwaro, vashandisi vanogona kuwana hukuru hwekugadzirisa matambudziko akadai sekusvibiswa kwevhidhiyo kana network networkouts. Izvo zvinyorwa zvespaiti vedzimba dzinogona kugamuchira zvikwangwani sekuguma kwevatengi kazhinji hazvizivikanwi neCDNs.