{"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\/hr\/blog\/administrirovanie\/ip-kvm-cherez-qemu","title":{"rendered":"IP-KVM putem QEMU","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"IP-KVM putem QEMU\" src=\"\/wp-content\/uploads\/2019\/08\/f9620a262b690b4494984658d33805f9.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nRje\u0161avanje problema pri pokretanju operativnog sustava na serverima bez KVM-a \u2014 nije lak zadatak. Kreiramo KVM-over-IP putem slike za oporavak i virtualne ma\u0161ine.<\/p>\n<p>U slu\u010daju problema s operativnim sustavom <noindex><a rel=\"nofollow\" href=\"http:\/\/slc.tl\/q58Za\">na udaljenom serveru<\/a><\/noindex>, administrator u\u010ditava sliku za oporavak i provodi potrebne radnje. Ova metoda odli\u010dno funkcionira kada je uzrok kvara poznat, a slika za oporavak i instalirani operativni sustav na serveru pripadaju jednoj obitelji. Ako uzrok kvara jo\u0161 nije poznat, potrebno je pratiti tijek pokretanja operativnog sustava.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h2>Udaljeni KVM<\/h2>\n<p>\nPristup konzoli servera mo\u017ee se dobiti pomo\u0107u ugra\u0111enih alata, poput IPMI ili Intel\u00ae vPro\u2122, ili putem vanjskih ure\u0111aja, poznatih kao IP-KVM. Postoje situacije kada sve navedene tehnologije nisu dostupne. Me\u0111utim, to nije kraj. Ako se server mo\u017ee udaljeno ponovno pokrenuti s slikom za oporavak temeljenom na operativnom sustavu Linux, mogu\u0107e je brzo organizirati KVM-over-IP.<\/p>\n<p>Slika za oporavak predstavlja potpuno funkcionalni operativni sustav koji se smje\u0161ta u radnu memoriju. Na taj na\u010din mo\u017eemo pokretati bilo koji softver, uklju\u010duju\u0107i i virtualne ma\u0161ine (VM). To zna\u010di da mo\u017eemo pokrenuti VM unutar kojeg \u0107e raditi operativni sustav servera. Pristup konzoli VM mo\u017ee se organizirati, na primjer, putem VNC-a.<\/p>\n<p>Za pokretanje operativnog sustava servera unutar VM potrebno je odrediti diskove servera kao diskove VM. U operativnim sustavima obitelji Linux fizi\u010dki diskovi predstavljaju se kao blok ure\u0111aji tipa <b>\/dev\/sdX<\/b>, s kojima se mo\u017ee raditi kao s obi\u010dnim datotekama.<\/p>\n<p>Neki hipervizori, kao \u0161to su QEMU i VirtualBox, omogu\u0107uju pohranu podataka VM u 'sirovom' formatu, odnosno samo podaci pohrane bez metapodataka hipervizora. Na taj na\u010din, VM se mo\u017ee pokrenuti s fizi\u010dkih diskova servera.<\/p>\n<p>Ovakav pristup zahtijeva resurse za pokretanje slike za oporavak i VM unutar nje. Me\u0111utim, u prisustvu \u010detiri i vi\u0161e gigabajta radne memorije, to ne\u0107e biti problem.<\/p>\n<h2>Priprema okru\u017eenja<\/h2>\n<p>\nKao virtualnu ma\u0161inu mo\u017ee se koristiti lagani i jednostavan program. <noindex><a rel=\"nofollow\" href=\"https:\/\/www.qemu.org\/\">QEMU<\/a><\/noindex>, koja \u010desto nije deo slike za oporavak, pa se mora instalirati odvojeno. Slika za oporavak koju nudimo klijentima zasniva se na <noindex><a rel=\"nofollow\" href=\"https:\/\/www.archlinux.org\/\">Arch Linux<\/a><\/noindex>, u kojoj se koristi menad\u017eer paketa <b>pacman<\/b>.<\/p>\n<p>Prvo je potrebno osigurati da slika za oporavak koristi najnovije verzije softvera. Proverite i a\u017eurirajte sve komponente OS-a slede\u0107om komandom:<\/p>\n<p><code>pacman -Suy<\/code><\/p>\n<p>Nakon a\u017euriranja potrebno je instalirati QEMU. Komanda za instalaciju putem pacmana bi\u0107e:<\/p>\n<p><code>pacman -S qemu<\/code><\/p>\n<p>Proverimo da li je qemu ispravno instaliran:<\/p>\n<p><code>root@sel-rescue ~ # qemu-system-x86_64 --version<br \/>\nQEMU emulator verzija 4.0.0<br \/>\nAutorska prava (c) 2003-2019 Fabrice Bellard i developeri QEMU projekta<\/code><\/p>\n<p>Ako je sve u redu, slika za oporavak je spremna za rad.<\/p>\n<h2>Pokretanje virtuelne ma\u0161ine<\/h2>\n<p>\nPrvo je potrebno odlu\u010diti koliko resursa \u0107e biti dodeljeno VM-u, i utvrditi put do fizi\u010dkih diskova. U na\u0161em slu\u010daju dodeli\u0107emo dva jezgra i dva gigabajta RAM-a virtuelnoj ma\u0161ini, dok se diskovi nalaze na putu <b>\/dev\/sda<\/b> i <b>\/dev\/sdb<\/b>. Pokre\u0107emo 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>Malo detaljnije o tome \u0161ta svaki parametar zna\u010di:<\/p>\n<ul>\n<li><b>-m 2048M<\/b> \u2014 dodeljujemo 2 GB RAM-a za VM;<\/li>\n<li><b>-net nic -net user<\/b> \u2014 dodajemo jednostavno povezivanje sa mre\u017eom preko hipervizora koriste\u0107i NAT (Network Address Translation);<\/li>\n<li><b>-enable-kvm<\/b> \u2014 uklju\u010dujemo potpunu virtualizaciju KVM (Kernel Virtual Machine);<\/li>\n<li><b>-cpu host<\/b> \u2014 ka\u017eemo virtuelnom procesoru da preuzme sve funkcionalnosti procesora servera;<\/li>\n<li><b>-M pc<\/b> \u2014 tip opreme PC;<\/li>\n<li><b>-smp 2<\/b> \u2014 virtuelni procesor treba da bude dvojezgarni;<\/li>\n<li><b>-vga std<\/b> \u2014 biramo standardnu grafi\u010dku kartu koja ne podr\u017eava velika ekran rezolucije;<\/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 put do blok ure\u0111aja koji predstavlja disk servera;<\/li>\n<li><b>format=raw<\/b> \u2014 ozna\u010davamo da su svi podaci u navedenom fajlu u \"sirom\" obliku, tj. kao na disku;<\/li>\n<li><b>index=0<\/b> \u2014 broj diska, mora se pove\u0107avati za jedan za svaki slede\u0107i disk;<\/li>\n<li><b>media=disk<\/b> \u2014 virtuelna ma\u0161ina treba da prepozna ovu jedinicu kao disk;<\/li>\n<\/ul>\n<\/li>\n<li><b>-vnc :0, password<\/b> \u2014 pokre\u0107emo VNC server podrazumevano na 0.0.0.0:5900, koriste\u0107i lozinku za autorizaciju;<\/li>\n<li><b>-monitor stdio<\/b> \u2014 komunikacija administratora sa qemu odvija\u0107e se kroz standardne ulazno-izlazne tokove.<\/li>\n<\/ul>\n<p>\nAko je sve u redu, pokrenu\u0107e se QEMU monitor: <\/p>\n<p><code>QEMU 4.0.0 monitor - upi\u0161ite 'help' za vi\u0161e informacija<br \/>\n(qemu)<\/code><\/p>\n<p>Navedeno je da autorizacija ide putem lozinke, ali nismo naveli samu lozinku. To se mo\u017ee uraditi slanjem komande change vnc password u QEMU-monitor. Va\u017ena napomena: lozinka ne mo\u017ee biti du\u017ea od osam simbola.<\/p>\n<p><code>(qemu) promjena vnc lozinke<br \/>\nLozinka: ******<\/code><\/p>\n<p>Nakon toga mo\u017eemo se povezati bilo kojim VNC klijentom, poput Remmina, putem IP adrese na\u0161eg servera i navedenom lozinkom.<\/p>\n<p><img decoding=\"async\" alt=\"IP-KVM putem 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 putem QEMU\" src=\"\/wp-content\/uploads\/2019\/08\/02a12b62938a7883363807eaa379279f.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSada ne samo da vidimo mogu\u0107e gre\u0161ke tijekom pokretanja, ve\u0107 se tako\u0111er mo\u017eemo boriti protiv njih.<\/p>\n<p>Nakon zavr\u0161enih radova potrebno je isklju\u010diti virtualnu ma\u0161inu. To se mo\u017ee u\u010diniti unutar operativnog sustava, slanjem signala za isklju\u010divanje, ili putem naredbe <b>system_powerdown<\/b> u QEMU monitoru. To \u0107e biti ekvivalentno jednom pritisku tipke za isklju\u010divanje: operativni sustav unutar virtualne ma\u0161ine \u0107e se glatko isklju\u010diti.<\/p>\n<h2>Instalacija operativnog sustava<\/h2>\n<p>\nVirtualna ma\u0161ina ima potpun pristup diskovima servera i stoga se mo\u017ee koristiti za ru\u010dnu instalaciju operativnog sustava. Jedino ograni\u010denje odnosi se na koli\u010dinu radne memorije: ISO slika ne mo\u017ee uvijek stati u radnu memoriju. Dodijelit \u0107emo \u010detiri gigabajta u radnu memoriju za pohranu slike u <b>\/mnt<\/b>:<\/p>\n<p><code>mount -t tmpfs -o size=4G tmpfs \/mnt<\/code><\/p>\n<p>Tako\u0111er \u0107emo preuzeti instalacijski obraz operativnog sustava 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>Sada mo\u017eemo pokrenuti 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>Oznaka <b>-boot d<\/b> postavlja pokretanje s CD pogona. Povezujemo se VNC klijentom i vidimo bootloader FreeBSD-a.<\/p>\n<p><img decoding=\"async\" alt=\"IP-KVM putem QEMU\" src=\"\/wp-content\/uploads\/2019\/08\/722f904ba4212bcce8746ca473489d50.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nBudu\u0107i da je za pristup internetu kori\u0161teno dobivanje adrese putem DHCP-a, mo\u017eda \u0107e nakon postavljanja biti potrebno podi\u0107i upravo instalirani sustav i ispraviti mre\u017ene postavke. U nekim slu\u010dajevima mo\u017ee biti potrebna instalacija drajvera mre\u017enog adaptera, jer se mre\u017ena kartica instalirana na serveru i emulirana u VM-u razlikuju.<\/p>\n<h2>Zaklju\u010dak<\/h2>\n<p>\nOvaj na\u010din organizacije daljinskog pristupa konzoli servera tro\u0161i dio resursa servera, ali ne postavlja nikakve posebne zahtjeve prema hardverskoj konfiguraciji servera, pa se mo\u017ee izvoditi u gotovo svakim uvjetima. Kori\u0161tenje takvog rje\u0161enja zna\u010dajno olak\u0161ava dijagnostiku softverskih gre\u0161aka i obnovu funkcionalnosti udaljenog servera.<br \/>\n<br \/>Izvor: <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 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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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