Osiguranje dostupnosti IT usluga. Petar Koraca
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1 Osiguranje dostupnosti IT usluga Petar Koraca
2 whoami VeleRi informatika, smjer programsko inženjerstvo Infobip, Pula Linux/Windows, High Availability, monitoring, virtualizacija,...
3 Tema? Internet Web Redundancija primjeri Virtualizacija
4 Internet Mreža svih mreža Globalni sustav međusobno povezanih mreža Odvojene mreže koje ujedinjava IP adresiranje te BGP routing TCP/IP protokol
5 Povijest ARPANET (UCLA, Stanford, UCSB, Utah) 1982 TCP/IP postavljen kao standard NSFNET Sir Tim Berners-Lee (CERN) HTTP protokol, Web server, Web browser, HTML prva web stranica: info.cern.ch
6 TCP/IP protokol Gornji slojevi su bliži aplikaciji, donji fizičkom prijenosu podataka 7 slojeva po OSI modelu
7 Internet routing Tier 1 network AT&T, Level3, Deutsche Telekom, Cogent, Sprint, Tata,... Ne kupuju traffic, posjeduju transkontinentalnu optiku Tier 2 network Vodafone, British Telecom, Interoute,... Tier 3 network BGP Border Gateway Protocol IX Internet Exchange
8 Traceroute Tracing route to [ ] 1 * * * Request timed out. 2 7 ms 6 ms 7 ms ms 10 ms 8 ms ms 10 ms 9 ms ms 7 ms * ms 9 ms 8 ms ms 48 ms 46 ms ae ebr2.berlin1.level3.net [ ] ms 49 ms 48 ms ms 39 ms 48 ms ae ebr1.dusseldorf1.level3.net [ ] ms 39 ms 40 ms ae ebr3.frankfurt1.level3.net [ ] ms 45 ms 48 ms ae csw1.frankfurt1.level3.net [ ] ms 51 ms 39 ms ae-1-60.edge3.frankfurt1.level3.net [ ] ms 39 ms 39 ms sprint-level3-ge.frankfurt1.level3.net [ ] ms 56 ms 57 ms sl-bb21-par sprintlink.net [ ] ms 127 ms 125 ms sl-crs1-par sprintlink.net [ ] ms 125 ms 126 ms sl-crs2-nyc sprintlink.net [ ] ms 138 ms 137 ms sl-crs2-rly sprintlink.net [ ] 20 * 138 ms 157 ms sl-crs2-dc sprintlink.net [ ] ms * 168 ms ms 168 ms 168 ms sl-crs4-atl sprintlink.net [ ] ms 187 ms 172 ms * * * Request timed out.
9 IP adrese IPv4 - ~4,3 milijarde IP adresa (10 9 ) Public npr Private 10.x.x.x x.x IPv6
10 Client-Server model Arhitektura mreže Klijent (korisnik) šalje zahtjeve Server (poslužitelj) odgovara na njih Web browsing, igre, video streaming,...
11 Server - karakteristike OS Linux / Windows / Solaris / BSD /... Static IP Public IP ili NAT Network Address Translation Dual Power Supply UPS - Uninterruptible power supply Multiple NIC (teaming) RAID redundantni diskovi Out-of-band management port BIOS Power on/off monitoring Vlasničke implementacije - $$$ Datacentar struja, hlađenje, disaster recovery, ISO, PCI certifikati,...
12 Server
13 Domain name IP Adresa: Domain name: DNS Domain Name Server
14 Web 1.0 Statički sadržaj, jako malo interakcije Hyperlink kao poveznica između stranica Korisnik može uglavnom pregledavati sadržaj Malo prometa Koncentriranje na prezentaciju sadržaja
15 Web 2.0 User generated content Kolaboracijski medij Social networking, blog, wiki, video, music,... Facebook, Twitter, Google Services, Netflix, Instagram,... Web API REST, SOAP, XML i JSON dokumenti
16 Broj korisnika interneta kroz godine
17 May, 2012
18
19
20
21
22 Web 2.0 numbers Twitter 500M tweetova na dan (6000/sec) Netflix 1/3 ukupnog US bandwidtha Salesforce 1B transakcija na dan Facebook - ~500+ M dnevno aktivnih korisnika Tumblr 500M pogleda dnevno, 40k/sec korisničkih zahtjeva Banke, burze,...
23 Client - Server v1 1 web server sa app i bazom
24 Client - Server v2 1 web server 1 db server
25 Daljnji zahtjevi Uptime SLA Service Level Agreement 99,999% - five nines 5.26 min/year 99,99% - four nines min/year Backup je nedovoljan 2 web servera + 2 baze SQL relacijske baze Master / Slave
26 Redundancija Aplikacija / servis Baza podataka Datacentar Struja Hlađenje ISP Internet Service Provider Mrežna oprema (ruter, firewall, switch, kablovi) Serveri Diskovi (RAID) Storage
27 Redundancija hardvera Cluster sustavi, CCERT-PUBDOC , CARNet
28 Load balancing LVS HAProxy Redundancija servisa High Availability Heartbeat, Pulse, Keepalived DRBD Distributed Replicated Block Device Clustering Microsoft Failover Cluster
29 LVS - Piranha LVS Linux Virtual Server Layer 4 load balancer Piranha RedHat implementacija (ipvsadm + pulse + lvsd) mrtav projekt Free & Open Source Direct Routing Sinkronizacija konekcija Active/standby Virtual IP vezan za Virtual Service Real server back end serveri
30 LVS Load Balancing
31 HAProxy Free & Open Source GitHub, Reddit, Farmville, RedHat, StackOverflow, Tumblr, Twitter, Virgin Airlines,... Layer 7 load balancer TCP/HTTP Potrebno je više resursa nego L4 balancer Features: URL rewriting ACL Access Control List (Front-end, back-end) Host header redirecting
32 Virtualizacija Apstrakcija hardvera Iskorištavanje resursa računala za više odvojenih okolina Stvarni OS, virtualni OS Fizičko računalo - host Virtual machine guest
33 Virtualizacija
34 Koristi virtualizacije Bolja iskoristivost resursa Kloniranje Snapshots (Live) Migration Testiranje...
35 Virtualizatori Oracle Virtualbox VMware Microsoft Hyper-V KVM Xen...
36 Primjer HA+LB+virt sustava
37 Georedundancija Razlozi: Zahtjevi klijenata Latencija Anycast oglašavanje istog range-a IP adresa na više lokacija Distribuirani sustavi Npr. baze podataka
38 Cloud IaaS Infrastructure as a Service AWS Amazon Web Services Rackspace PaaS Platform as a Service Heroku SaaS Software as a Service GMail
39 Ispadi 2012 leap second Linux bug NTP Network Time Protocol LinkedIn, Reddit, Mozilla, Netflix,... Skype 24h downtime... Cost of outage: $90,000 per hour in the media sector to about $6.48 million per hour for large online brokerages
40 The end
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