{"id":37530,"date":"2019-10-31T22:18:10","date_gmt":"2019-10-31T19:18:10","guid":{"rendered":"https:\/\/prohoster.info\/blog\/ip-kvm-cherez-qemu\/"},"modified":"2019-10-31T22:18:10","modified_gmt":"2019-10-31T19:18:10","slug":"ip-kvm-cherez-qemu","status":"publish","type":"post","link":"https:\/\/prohoster.info\/no\/blog\/administrirovanie\/ip-kvm-cherez-qemu","title":{"rendered":"IP-KVM via QEMU","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"IP-KVM via QEMU\" src=\"\/wp-content\/uploads\/2019\/08\/f9620a262b690b4494984658d33805f9.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nFeils\u00f8king ved oppstart av operativsystemet p\u00e5 servere uten KVM er en utfordrende oppgave. Vi oppretter KVM-over-IP gjennom gjenopprettingsbildet og en virtuell maskin.<\/p>\n<p>Hvis det oppst\u00e5r problemer med operativsystemet <noindex><a rel=\"nofollow\" href=\"http:\/\/slc.tl\/q58Za\">p\u00e5 den eksterne serveren<\/a><\/noindex>, laster administratoren opp gjenopprettingsbildet og utf\u00f8rer n\u00f8dvendige arbeider. Denne metoden fungerer utmerket n\u00e5r \u00e5rsaken til feilen er kjent, og gjenopprettingsbildet og det installerte operativsystemet p\u00e5 serveren tilh\u00f8rer samme familie. Hvis \u00e5rsaken til feilen enn\u00e5 ikke er kjent, er det n\u00f8dvendig \u00e5 overv\u00e5ke oppstartsprosessen av operativsystemet.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h2>Fjern-KVM<\/h2>\n<p>\nTilgang til konsollen til serveren kan oppn\u00e5s ved hjelp av innebygde verkt\u00f8y, som IPMI eller Intel\u00ae vPro\u2122, eller ved hjelp av eksterne enheter som kalles IP-KVM. Det finnes situasjoner der alle de nevnte teknologiene ikke er tilgjengelige. Men dette er ikke slutten. Hvis serveren kan startes eksternt i gjenopprettingsbildet basert p\u00e5 et Linux-operativsystem, kan KVM-over-IP raskt opprettes.<\/p>\n<p>Gjenopprettingsbildet er et fullt operativsystem som plasseres i RAM. P\u00e5 denne m\u00e5ten kan vi kj\u00f8re hvilken som helst programvare, inkludert virtuelle maskiner (VM). Dette betyr at vi kan starte en VM der serverens operativsystem vil kj\u00f8re. Tilgang til konsollen til VM kan for eksempel organiseres via VNC.<\/p>\n<p>For \u00e5 starte operativsystemet til serveren inne i VM m\u00e5 serverens disker angis som disker til VM. I Linux-operativsystemer representeres fysiske disker som blokk-enheter av typen <b>\/dev\/sdX<\/b>, som kan behandles som vanlige filer.<\/p>\n<p>Noen hypervisorer, som QEMU og VirtualBox, tillater lagring av data fra VM i \"r\u00e5\" format, det vil si kun lagringsdata uten hypervisorens metadatak. Dermed kan VM startes ved \u00e5 bruke serverens fysiske disker.<\/p>\n<p>Denne metoden krever ressurser for \u00e5 starte gjenopprettingsbildet og VM inni det. Men med fire gigabyte eller mer RAM vil dette ikke v\u00e6re et problem.<\/p>\n<h2>Forberedelse av milj\u00f8et<\/h2>\n<p>\nSom virtuell maskin kan en lettvekts og enkel programvare brukes <noindex><a rel=\"nofollow\" href=\"https:\/\/www.qemu.org\/\">QEMU<\/a><\/noindex>, som oftest ikke er en del av gjenopprettingsbildet, s\u00e5 den m\u00e5 installeres separat. Gjenopprettingsbildet vi tilbyr kundene v\u00e5re, er basert p\u00e5 <noindex><a rel=\"nofollow\" href=\"https:\/\/www.archlinux.org\/\">Arch Linux<\/a><\/noindex>, der det brukes en pakkebehandler <b>pacman<\/b>.<\/p>\n<p>F\u00f8rst m\u00e5 vi forsikre oss om at gjenopprettingsbildet bruker de nyeste versjonene av programvaren. Du kan sjekke og oppdatere alle operativsystemkomponentene med f\u00f8lgende kommando:<\/p>\n<p><code>pacman -Suy<\/code><\/p>\n<p>Etter oppdateringen m\u00e5 du installere QEMU. Kommandoen for installasjon via pacman vil se slik ut:<\/p>\n<p><code>pacman -S qemu<\/code><\/p>\n<p>La oss sjekke at qemu er installert korrekt:<\/p>\n<p><code>root@sel-rescue ~ # qemu-system-x86_64 --version<br \/>\nQEMU emulator version 4.0.0<br \/>\nCopyright (c) 2003-2019 Fabrice Bellard og QEMU-prosjektets utviklere<\/code><\/p>\n<p>Hvis alt er i orden, er gjenopprettingsbildet klart til bruk.<\/p>\n<h2>Start av den virtuelle maskinen<\/h2>\n<p>\nF\u00f8rst m\u00e5 vi bestemme antall ressurser som tildeles VM, og finne stiene til de fysiske diskene. I v\u00e5rt tilfelle vil vi tildele to kjerner og to gigabyte RAM til den virtuelle maskinen, og diskene er plassert i <b>\/dev\/sda<\/b> og <b>\/dev\/sdb<\/b>. Vi starter VM-en:<\/p>\n<p><code>qemu-system-x86_64 <br \/>\n -m 2048M <br \/>\n -net nic -net user <br \/>\n -enable-kvm <br \/>\n -cpu host,nx <br \/>\n -M pc <br \/>\n -smp 2 <br \/>\n -vga std <br \/>\n -drive file=\/dev\/sda,format=raw,index=0,media=disk <br \/>\n -drive file=\/dev\/sdb,format=raw,index=1,media=disk <br \/>\n -vnc :0,password <br \/>\n -monitor stdio<\/code><\/p>\n<p>Litt mer detaljert om hva hver av parameterne betyr:<\/p>\n<ul>\n<li><b>-m 2048M<\/b> \u2014 vi tildeler 2 GB RAM til VM;<\/li>\n<li><b>-net nic -net user<\/b> \u2014 legger til en enkel nettverksforbindelse via hypervisor ved hjelp av NAT (Network Address Translation);<\/li>\n<li><b>-enable-kvm<\/b> \u2014 aktiverer full virtualisering KVM (Kernel Virtual Machine);<\/li>\n<li><b>-cpu host<\/b> \u2014 vi sier til den virtuelle prosessoren \u00e5 hente all funksjonalitet fra serverens prosessor;<\/li>\n<li><b>-M pc<\/b> \u2014 maskinvaretypen er PC;<\/li>\n<li><b>-smp 2<\/b> \u2014 den virtuelle prosessoren skal v\u00e6re tokjernet;<\/li>\n<li><b>-vga std<\/b> \u2014 vi velger et standard grafikkort som ikke st\u00f8tter h\u00f8ye skjermoppl\u00f8sninger;<\/li>\n<li><b>-drive file=\/dev\/sda,format=raw,index=0,media=disk<\/b>\n<ul>\n<li><b>file=\\\/dev\\\/sdX<\/b> \u2014 stien til blokkoppbevaringsenheten som representerer serverens disk;<\/li>\n<li><b>format=raw<\/b> \u2014 vi merker at i den angitte filen er alle dataene i \"r\u00e5\" format, det vil si som p\u00e5 disken;<\/li>\n<li><b>index=0<\/b> \u2014 nummeret p\u00e5 disken, m\u00e5 \u00f8kes med \u00e9n for hver p\u00e5f\u00f8lgende disk;<\/li>\n<li><b>media=disk<\/b> \u2014 den virtuelle maskinen m\u00e5 gjenkjenne disse lagringsenhetene som disker;<\/li>\n<\/ul>\n<\/li>\n<li><b>-vnc :0, password<\/b> \u2014 vi starter VNC-serveren som standard p\u00e5 0.0.0.0:5900, med et passord for autentisering;<\/li>\n<li><b>-monitor stdio<\/b> \u2014 kommunikasjonen mellom administratoren og qemu vil skje via standard inndata- og utdata-str\u00f8mmer.<\/li>\n<\/ul>\n<p>\nHvis alt er i orden, vil QEMU-monitoren starte: <\/p>\n<p><code>QEMU 4.0.0 overv\u00e5kingssystem - skriv 'hj\u00e6lp' for mer informasjon<br \/>\n(qemu)<\/code><\/p>\n<p>Vi har angitt at autentiseringen skjer med passord, men vi har ikke spesifisert selve passordet. Dette kan gj\u00f8res ved \u00e5 sende kommandoen change vnc password i QEMU-monteren. Viktig merknad: passordet kan ikke v\u00e6re lenger enn \u00e5tte tegn.<\/p>\n<p><code>(qemu) endre vnc-passord<br \/>\nPassord: ******<\/code><\/p>\n<p>Etter dette kan vi koble til med en hvilken som helst VNC-klient, for eksempel Remmina, ved hjelp av IP-adressen til serveren v\u00e5r og det passordet vi har angitt.<\/p>\n<p><img decoding=\"async\" alt=\"IP-KVM via QEMU\" src=\"\/wp-content\/uploads\/2019\/08\/f735a37d49038b472d6e5c22df4e7570.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"IP-KVM via QEMU\" src=\"\/wp-content\/uploads\/2019\/08\/02a12b62938a7883363807eaa379279f.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nN\u00e5 ser vi ikke bare mulige feil under oppstart, men vi kan ogs\u00e5 h\u00e5ndtere dem.<\/p>\n<p>N\u00e5r arbeidet er fullf\u00f8rt, m\u00e5 den virtuelle maskinen avsluttes. Dette kan gj\u00f8res b\u00e5de innenfor operativsystemet ved \u00e5 sende et avslagssignal, eller ved \u00e5 gi kommandoen <b>system_powerdown<\/b> i QEMU-monitoren. Dette vil v\u00e6re ekvivalent med \u00e5 trykke p\u00e5 av-knappen: operativsystemet inne i den virtuelle maskinen vil avsluttes glatt.<\/p>\n<h2>Installasjon av operativsystemet<\/h2>\n<p>\nDen virtuelle maskinen har full tilgang til serverens disker og kan derfor brukes til manuelt \u00e5 installere operativsystemet. Den eneste begrensningen er mengden RAM: ikke alltid kan ISO-bildet plasseres i RAM. La oss allokere fire gigabyte i RAM for \u00e5 lagre bildet i <b>\/mnt<\/b>:<\/p>\n<p><code>mount -t tmpfs -o size=4G tmpfs \/mnt<\/code><\/p>\n<p>Vi laster ogs\u00e5 ned installasjonsbildet av operativsystemet FreeBSD 12.0:<\/p>\n<p><code>wget -P \/mnt ftp:\/\/ftp.freebsd.org\/pub\/FreeBSD\/releases\/amd64\/amd64\/ISO-IMAGES\/12.0\/FreeBSD-12.0-RELEASE-amd64-bootonly.iso<\/code><\/p>\n<p>N\u00e5 kan vi starte VM:<\/p>\n<p><code>qemu-system-x86_64 <br \/>\n -m 2048M <br \/>\n -net nic -net user <br \/>\n -enable-kvm <br \/>\n -cpu host,nx <br \/>\n -M pc <br \/>\n -smp 2 <br \/>\n -vga std <br \/>\n -drive file=\/dev\/sda,format=raw,index=0,media=disk <br \/>\n -drive file=\/dev\/sdb,format=raw,index=1,media=disk <br \/>\n -vnc :0,password <br \/>\n -monitor stdio <br \/>\n -cdrom \/mnt\/FreeBSD-12.0-RELEASE-amd64-bootonly.iso <br \/>\n -boot d<br \/>\n<\/code><\/p>\n<p>Flagget <b>-boot d<\/b> angir oppstart fra CD-stasjonen. Vi kobler til med VNC-klienten og ser FreeBSD-oppstarteren.<\/p>\n<p><img decoding=\"async\" alt=\"IP-KVM via QEMU\" src=\"\/wp-content\/uploads\/2019\/08\/722f904ba4212bcce8746ca473489d50.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSiden DHCP ble brukt for \u00e5 f\u00e5 tilgang til Internett, kan det v\u00e6re n\u00f8dvendig etter oppsett \u00e5 starte opp i det nyinstallerte systemet og korrigere nettverksinnstillingene. I noen tilfeller kan det v\u00e6re n\u00f8dvendig \u00e5 installere drivere for nettverksadapteren, da det nettverkskortet som er installert p\u00e5 serveren og som emuleres i VM, er forskjellige.<\/p>\n<h2>Konklusjon<\/h2>\n<p>\nDenne metoden for \u00e5 organisere ekstern tilgang til serverens konsoll bruker en del av serverressursene, men stiller ingen spesielle krav til serverens maskinvare, og kan derfor utf\u00f8res under praktisk talt alle forhold. Bruken av en slik l\u00f8sning gj\u00f8r det betydelig enklere \u00e5 diagnostisere programvarefeil og gjenopprette den eksterne serverens funksjonalitet.<br \/>\n<br \/>Kilde: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/selectel\/blog\/464565\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0423\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435 \u043d\u0435\u0438\u0441\u043f\u0440\u0430\u0432\u043d\u043e\u0441\u0442\u0435\u0439 \u043f\u0440\u0438 \u0437\u0430\u0433\u0440\u0443\u0437\u043a\u0435 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u043d\u0430 \u0441\u0435\u0440\u0432\u0435\u0440\u0430\u0445 \u0431\u0435\u0437 KVM \u2014 \u043d\u0435\u043f\u0440\u043e\u0441\u0442\u043e\u0435 \u0437\u0430\u043d\u044f\u0442\u0438\u0435. \u0421\u043e\u0437\u0434\u0430\u0435\u043c \u0441\u0435\u0431\u0435 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\u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u044b\u0435 \u0440\u0430\u0431\u043e\u0442\u044b. \u0422\u0430\u043a\u043e\u0439 \u0441\u043f\u043e\u0441\u043e\u0431 \u043e\u0442\u043b\u0438\u0447\u043d\u043e \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442, \u043a\u043e\u0433\u0434\u0430 \u043f\u0440\u0438\u0447\u0438\u043d\u0430 \u0441\u0431\u043e\u044f \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u0430, \u0430 \u043e\u0431\u0440\u0430\u0437 \u0432\u043e\u0441\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u0438 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u043d\u0430\u044f \u043d\u0430 \u0441\u0435\u0440\u0432\u0435\u0440\u0435 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":28165,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-37530","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.5 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0423\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435 \u043d\u0435\u0438\u0441\u043f\u0440\u0430\u0432\u043d\u043e\u0441\u0442\u0435\u0439 \u043f\u0440\u0438 \u0437\u0430\u0433\u0440\u0443\u0437\u043a\u0435 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u043d\u0430 \u0441\u0435\u0440\u0432\u0435\u0440\u0430\u0445.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" 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