{"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\/sv\/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 \/>\nFels\u00f6kning av operativsystemets uppstart p\u00e5 servrar utan KVM \u00e4r en utmaning. Vi skapar KVM-over-IP via en \u00e5terst\u00e4llningsavbildning och en virtuell maskin.<\/p>\n<p>Vid problem med operativsystemet <noindex><a rel=\"nofollow\" href=\"http:\/\/slc.tl\/q58Za\">p\u00e5 den avl\u00e4gsna servern<\/a><\/noindex>, laddar administrat\u00f6ren upp en \u00e5terst\u00e4llningsbild och utf\u00f6r n\u00f6dv\u00e4ndiga \u00e5tg\u00e4rder. Denna metod fungerar utm\u00e4rkt n\u00e4r orsaken till felet \u00e4r k\u00e4nd och \u00e5terst\u00e4llningsbilden och det installerade operativsystemet p\u00e5 servern tillh\u00f6r samma familj. Om orsaken till felet \u00e4nnu inte \u00e4r k\u00e4nd m\u00e5ste man \u00f6vervaka uppstartsprocessen f\u00f6r operativsystemet.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h2>Avl\u00e4gsen KVM<\/h2>\n<p>\n\u00c5tkomst till serverns konsol kan g\u00f6ras via inbyggda verktyg som IPMI eller Intel\u00ae vPro\u2122, eller genom externa enheter kallade IP-KVM. Det finns situationer d\u00e4r alla ovanst\u00e5ende teknologier \u00e4r otillg\u00e4ngliga. Men det \u00e4r inte slutet. Om servern kan startas om p\u00e5 distans till en \u00e5terst\u00e4llningsbild baserad p\u00e5 ett operativsystem fr\u00e5n Linux-familjen kan KVM-over-IP snabbt ordnas.<\/p>\n<p>\u00c5terst\u00e4llningsbilden \u00e4r ett fullst\u00e4ndigt operativsystem som finns i RAM-minnet. D\u00e4rf\u00f6r kan vi k\u00f6ra mjukvara, inklusive virtuella maskiner (VM). Det vill s\u00e4ga att en VM kan startas, d\u00e4r operativsystemet f\u00f6r servern kommer att k\u00f6ras. \u00c5tkomsten till VM-konsolen kan ordnas, till exempel via VNC.<\/p>\n<p>F\u00f6r att starta serverns operativsystem inuti VM m\u00e5ste serverns diskar anges som VM-diskar. I operativsystem fr\u00e5n Linux-familjen representeras fysiska diskar som blockenheter av typen <b>\/dev\/sdX<\/b>, med vilka man kan arbeta som med vanliga filer.<\/p>\n<p>Vissa hypervisorer, s\u00e5som QEMU och VirtualBox, till\u00e5ter lagring av VM-data i 'r\u00e5'-format, det vill s\u00e4ga endast lagringsdata utan hypervisor-metadata. D\u00e4rf\u00f6r kan VM k\u00f6ras med hj\u00e4lp av serverns fysiska diskar.<\/p>\n<p>Denna metod kr\u00e4ver resurser f\u00f6r att k\u00f6ra \u00e5terst\u00e4llningsbilden och VM inuti den. Men med fyra eller fler gigabyte RAM b\u00f6r detta inte vara ett problem.<\/p>\n<h2>F\u00f6rberedelse av milj\u00f6n<\/h2>\n<p>\nSom virtuell maskin kan man anv\u00e4nda ett l\u00e4ttvikts- och enkelt program <noindex><a rel=\"nofollow\" href=\"https:\/\/www.qemu.org\/\">QEMU<\/a><\/noindex>, som oftast inte \u00e4r en del av \u00e5terst\u00e4llningsbilden och d\u00e4rf\u00f6r m\u00e5ste installeras separat. \u00c5terst\u00e4llningsbilden som vi erbjuder v\u00e5ra kunder baseras p\u00e5 <noindex><a rel=\"nofollow\" href=\"https:\/\/www.archlinux.org\/\">Arch Linux<\/a><\/noindex>, d\u00e4r pakethanteraren <b>pacman<\/b>.<\/p>\n<p>F\u00f6rst m\u00e5ste vi s\u00e4kerst\u00e4lla att \u00e5terst\u00e4llningsavbildningen anv\u00e4nder de senaste versionerna av programvaran. En kontroll och uppdatering av alla operativsystemskomponenter kan g\u00f6ras med f\u00f6ljande kommando:<\/p>\n<p><code>pacman -Suy<\/code><\/p>\n<p>Efter uppdateringen m\u00e5ste QEMU installeras. Kommandot f\u00f6r installation via pacman ser ut s\u00e5 h\u00e4r:<\/p>\n<p><code>pacman -S qemu<\/code><\/p>\n<p>Vi kontrollerar att qemu har installerats 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 och QEMU-projektets utvecklare<\/code><\/p>\n<p>Om allt ser bra ut, \u00e4r \u00e5terst\u00e4llningsavbildningen redo f\u00f6r anv\u00e4ndning.<\/p>\n<h2>Starta den virtuella maskinen<\/h2>\n<p>\nF\u00f6rst m\u00e5ste vi best\u00e4mma m\u00e4ngden resurser som ska tilldelas VM, och ta reda p\u00e5 v\u00e4garna till de fysiska diskarna. I v\u00e5rt fall kommer vi att tilldela tv\u00e5 k\u00e4rnor och tv\u00e5 gigabyte RAM till den virtuella maskinen, och diskarna ligger p\u00e5 v\u00e4gen <b>\/dev\/sda<\/b> och <b>\/dev\/sdb<\/b>. L\u00e5t oss starta 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<\/code><\/p>\n<p>Lite mer detaljer om vad varje parameter betyder:<\/p>\n<ul>\n<li><b>-m 2048M<\/b> \u2014 vi tilldelar 2 GB RAM till VM;<\/li>\n<li><b>-net nic -net user<\/b> \u2014 vi l\u00e4gger till en enkel n\u00e4tverksanslutning genom hypervisorn med hj\u00e4lp av NAT (N\u00e4tverksadress\u00f6vers\u00e4ttning);<\/li>\n<li><b>-enable-kvm<\/b> \u2014 vi aktiverar full virtualisering med KVM (Kernel Virtual Machine);<\/li>\n<li><b>-cpu host<\/b> \u2014 vi s\u00e4ger till den virtuella processorn att f\u00e5 hela funktionaliteten fr\u00e5n serverns processor;<\/li>\n<li><b>-M pc<\/b> \u2014 typ av utrustning PC;<\/li>\n<li><b>-smp 2<\/b> \u2014 den virtuella processorn m\u00e5ste vara tv\u00e5k\u00e4rnig;<\/li>\n<li><b>-vga std<\/b> \u2014 vi v\u00e4ljer ett standardgrafikkort som inte st\u00f6der h\u00f6guppl\u00f6sta sk\u00e4rmar;<\/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 v\u00e4gen till blockenheten som representerar serverns disk;<\/li>\n<li><b>format=raw<\/b> \u2014 vi anger att alla data i den angivna filen ligger i \"r\u00e5\" format, det vill s\u00e4ga som p\u00e5 disken;<\/li>\n<li><b>index=0<\/b> \u2014 disknumret, som ska \u00f6ka med en enhet f\u00f6r varje n\u00e4sta disk;<\/li>\n<li><b>media=disk<\/b> \u2014 den virtuella maskinen ska k\u00e4nna igen detta lagringsutrymme som en disk;<\/li>\n<\/ul>\n<\/li>\n<li><b>-vnc :0, password<\/b> \u2014 vi startar VNC-servern som standard p\u00e5 0.0.0.0:5900, med l\u00f6senord som autentisering;<\/li>\n<li><b>-monitor stdio<\/b> \u2014 kommunikationen mellan administrat\u00f6ren och qemu kommer att ske via standard in- och utstr\u00f6m.<\/li>\n<\/ul>\n<p>\nOm allt \u00e4r i ordning kommer QEMU-monitoren att starta: <\/p>\n<p><code>QEMU 4.0.0 \u00f6vervakning - skriv 'hj\u00e4lp' f\u00f6r mer information<br \/>\n(qemu)<\/code><\/p>\n<p>Vi angav att autentisering sker med l\u00f6senord, men angav inte sj\u00e4lva l\u00f6senordet. Det kan g\u00f6ras genom att skicka kommandot change vnc password i QEMU-monitorn. Viktig anm\u00e4rkning: L\u00f6senordet f\u00e5r inte vara l\u00e4ngre \u00e4n \u00e5tta tecken.<\/p>\n<p><code>(qemu) \u00e4ndra vnc-l\u00f6senord<br \/>\nL\u00f6senord: ******<\/code><\/p>\n<p>Efter detta kan vi ansluta med vilken VNC-klient som helst, till exempel Remmina, via IP-adressen till v\u00e5r server med det angivna l\u00f6senordet.<\/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 \/>\nNu kan vi inte bara se eventuella fel under uppstarten, utan ocks\u00e5 hantera dem.<\/p>\n<p>N\u00e4r arbetet \u00e4r slutf\u00f6rt m\u00e5ste den virtuella maskinen st\u00e4ngas av. Detta kan g\u00f6ras antingen inuti operativsystemet genom att skicka en signal f\u00f6r avst\u00e4ngning, eller genom att ge kommandot <b>system_powerdown<\/b> i QEMU-monitoren. Detta kommer att vara ekvivalent med att trycka p\u00e5 str\u00f6mbrytaren en g\u00e5ng: operativsystemet inuti den virtuella maskinen kommer att avslutas smidigt.<\/p>\n<h2>Installation av operativsystemet<\/h2>\n<p>\nDen virtuella maskinen har full tillg\u00e5ng till serverns diskar och kan d\u00e4rf\u00f6r anv\u00e4ndas f\u00f6r att installera operativsystemet manuellt. Den enda begr\u00e4nsningen \u00e4r m\u00e4ngden RAM-minne: ISO-bilden f\u00e5r inte alltid plats i RAM-minnet. Vi tilldelar fyra gigabyte i RAM-minnet f\u00f6r att lagra bilden i <b>\/mnt<\/b>:<\/p>\n<p><code>mount -t tmpfs -o size=4G tmpfs \/mnt<\/code><\/p>\n<p>Vi laddar ocks\u00e5 ner installationsbilden 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>Nu kan vi starta 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>Flagga <b>-boot d<\/b> st\u00e4ller in uppstart fr\u00e5n CD-enheten. Vi ansluter med VNC-klienten och ser FreeBSD-laddaren.<\/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 \/>\nEftersom internet\u00e5tkomst skedde genom att h\u00e4mta en adress via DHCP kan det vara n\u00f6dv\u00e4ndigt att starta det just installerade systemet och korrigera n\u00e4tverksinst\u00e4llningarna efter konfigurationen. I vissa fall kan det kr\u00e4vas installation av drivrutiner f\u00f6r n\u00e4tverkskortet, eftersom n\u00e4tverkskortet som \u00e4r installerat i servern och emuleras i VM skiljer sig.<\/p>\n<h2>Slutsats<\/h2>\n<p>\nDenna metod f\u00f6r att organisera fj\u00e4rr\u00e5tkomst till serverkonsolen anv\u00e4nder en del av serverns resurser, men st\u00e4ller inga s\u00e4rskilda krav p\u00e5 serverns h\u00e5rdvara, och kan d\u00e4rf\u00f6r utf\u00f6ras under n\u00e4stan vilka f\u00f6rh\u00e5llanden som helst. Anv\u00e4ndningen av en s\u00e5dan l\u00f6sning g\u00f6r det betydligt l\u00e4ttare att diagnostisera programvarufel och \u00e5terst\u00e4lla funktionaliteten hos den fj\u00e4rrstyrda servern.<br \/>\n<br \/>K\u00e4lla: <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 KVM-over-IP \u0447\u0435\u0440\u0435\u0437 \u043e\u0431\u0440\u0430\u0437 \u0432\u043e\u0441\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u0438 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u0443\u044e \u043c\u0430\u0448\u0438\u043d\u0443. \u0412 \u0441\u043b\u0443\u0447\u0430\u0435 \u0432\u043e\u0437\u043d\u0438\u043a\u043d\u043e\u0432\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c \u0441 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u043e\u0439 \u043d\u0430 \u0443\u0434\u0430\u043b\u0435\u043d\u043d\u043e\u043c \u0441\u0435\u0440\u0432\u0435\u0440\u0435, \u0430\u0434\u043c\u0438\u043d\u0438\u0441\u0442\u0440\u0430\u0442\u043e\u0440 \u0437\u0430\u0433\u0440\u0443\u0436\u0430\u0435\u0442 \u043e\u0431\u0440\u0430\u0437 \u0432\u043e\u0441\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f 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[&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 5.0.4 - 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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