{"id":87364,"date":"2020-07-07T13:42:29","date_gmt":"2020-07-07T11:42:29","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/nastraivaem-drbd-dlya-replikaczii-hranilishha-na-dva-centos-7-servera"},"modified":"2020-07-07T13:42:29","modified_gmt":"2020-07-07T11:42:29","slug":"nastraivaem-drbd-dlya-replikaczii-hranilishha-na-dva-centos-7-servera","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/nastraivaem-drbd-dlya-replikaczii-hranilishha-na-dva-centos-7-servera","title":{"rendered":"Seame DRBD k\u00f5rvale kahe CentOS 7 serveri salvestuse kopeerimiseks","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><b><i>Artikli t\u00f5lge on koostatud kursuse alguse eel\u00f5htul <noindex><a rel=\"nofollow\" href=\"https:\/\/otus.pw\/17x7\/\">\u00abLinuxi administraator. Virtualiseerimine ja klasterdamine\u00bb<\/a><\/noindex>.<\/i><\/b><\/p>\n<p>\nDRBD (Distributed Replicated Block Device \u2014 jaotatud replikatsiooniga plokkseade) on jaotatud, paindlik ja universaalne andmesalvestuse lahendus Linuxile. See peegeldab plokkseadmete, nagu k\u00f5vakettad, jaotused, loogilised mahud jne, sisu serverite vahel. See loob andmete koopiad kahel salvestusseadmel, et \u00fche rikke korral saaks kasutada andmeid teisel.<\/p>\n<p>Seda v\u00f5ib pidada millegi sarnaseks <noindex><a rel=\"nofollow\" href=\"https:\/\/www.tecmint.com\/create-raid1-in-linux\/\">v\u00f5rgukonfiguratsioonile RAID<\/a><\/noindex> 1, kus kettad peegelduvad erinevate serverite peale. Selle t\u00f6\u00f6p\u00f5him\u00f5te on aga t\u00e4iesti erinev RAID-ist (isegi v\u00f5rgu RAID-ist).<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>Algselt kasutati DRBD peamiselt k\u00f5rge k\u00e4ttesaadavuse (HA \u2014 high availability) arvutiklasterites, kuid alates \u00fcheksandast versioonist saab seda kasutada pilvesalvestuslahenduste juurutamiseks.<\/p>\n<p>Selles artiklis r\u00e4\u00e4gime, kuidas paigaldada DRBD CentOS-is ja anname l\u00fchikese \u00fclevaate, kuidas seda kasutada salvestuse (jaotuse) replikatsiooniks kahe serveri vahel. See on ideaalne artikkel DRBD-ga t\u00f6\u00f6 alustamiseks Linuxis.<\/p>\n<h3>Testimisalune<\/h3>\n<p>\nKasutame selle seadistuse jaoks kahe s\u00f5lmega klastrit.<\/p>\n<ul>\n<li>S\u00f5lm 1: 192.168.56.101 \u2013 tecmint.tecmint.lan<\/li>\n<li>S\u00f5lm 2: 192.168.56.102 \u2013 server1.tecmint.lan<\/li>\n<\/ul>\n<p><\/p>\n<h4>Samm 1: DRBD paketide paigaldamine<\/h4>\n<p>\nDRBD on realiseeritud Linuxi kerneli moodulina. See on virtuaalse plokkseadmestiku draiver, seega asub see s\u00fcsteemi sisendi ja v\u00e4ljundi virna k\u00f5ige alumises osas.<\/p>\n<p>DRBD-d saab paigaldada ELRepo v\u00f5i EPEL kaudu. Alustame ELRepo paketti allkirjastamise v\u00f5tme importimise ja repository \u00fchendamisega m\u00f5lemas s\u00f5lmes, nagu allpool n\u00e4idatud.<\/p>\n<pre><code class=\"bash\"># rpm --import https:\/\/www.elrepo.org\/RPM-GPG-KEY-elrepo.org\n# rpm -Uvh http:\/\/www.elrepo.org\/elrepo-release-7.0-3.el7.elrepo.noarch.rpm<\/code><\/pre>\n<p>Seej\u00e4rel peab m\u00f5lemas s\u00f5lmes paigaldama DRBD kerneli mooduli ja utiliidid j\u00e4rgmiste k\u00e4skudega:<\/p>\n<pre><code class=\"bash\"># yum install -y kmod-drbd84 drbd84-utils<\/code><\/pre>\n<p>\nKui teil on SELinux sisse l\u00fclitatud, peate seadistama poliitikad nii, et DRBD protsessid ei oleks SELinux-i kontrolli all.<\/p>\n<pre><code class=\"bash\"># semanage permissive -a drbd_t\n<\/code><\/pre>\n<p>\nLisaks, kui teie s\u00fcsteemis t\u00f6\u00f6tab tulem\u00fc\u00fcri (firewalld), peate lisama DRBD pordi 7789, et v\u00f5imaldada andmete s\u00fcnkroniseerimist kahe s\u00f5lme vahel.<\/p>\n<p>K\u00e4ivitage need k\u00e4sud esimeses s\u00f5lmes:<\/p>\n<pre><code class=\"bash\"># firewall-cmd --permanent --add-rich-rule='rule family=&quot;ipv4&quot;  source address=&quot;192.168.56.102&quot; port port=&quot;7789&quot; protocol=&quot;tcp&quot; accept'\n# firewall-cmd --reload<\/code><\/pre>\n<p>\nSeej\u00e4rel k\u00e4ivitage need k\u00e4sud teises s\u00f5lmes:<\/p>\n<pre><code class=\"bash\"># firewall-cmd --permanent --add-rich-rule='rule family=&quot;ipv4&quot; source address=&quot;192.168.56.101&quot; port port=&quot;7789&quot; protocol=&quot;tcp&quot; accept'\n# firewall-cmd --reload<\/code><\/pre>\n<p><\/p>\n<h4>Samm 2. Madalamate salvestusruumide ettevalmistamine<\/h4>\n<p>\nN\u00fc\u00fcd, kui meil on DRBD paigaldatud m\u00f5lemas klastris, peame ette valmistama (peaaegu) sama suurusega salvestusruumid. See v\u00f5ib olla k\u00f5vaketta jaotus (v\u00f5i kogu f\u00fc\u00fcsiline k\u00f5vaketas), tarkvara RAID seade, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.tecmint.com\/create-lvm-storage-in-linux\/\">loogiline LVM maht<\/a><\/noindex> v\u00f5i m\u00f5ni muu plokkseade, mis asub teie s\u00fcsteemis.<\/p>\n<p>Selles artiklis loome testplokkseadmestiku suurusega 2 GB k\u00e4su dd abil.<\/p>\n<pre><code class=\"bash\"># dd if=\/dev\/zero of=\/dev\/sdb1 bs=2024k count=1024<\/code><\/pre>\n<p>\nEeldame, et see on kasutamata partitsioon (\/dev\/sdb1) teisel plokkseadmestikul (\/dev\/sdb), mis on \u00fchendatud m\u00f5lema s\u00f5lmega.<\/p>\n<h4>Samm 3. DRBD seadistamine<\/h4>\n<p>\nDRBD p\u00f5hikonfiguratsioonifail on <code>\/etc\/drbd.conf<\/code>, t\u00e4iendavad konfiguratsioonifailid on saadaval kataloogis <code>\/etc\/drbd.d<\/code>.<\/p>\n<p>Kuna peame salvestust replitseerima, peame lisama vajalikud konfiguratsioonid faili <code>\/etc\/drbd.d\/global_common.conf<\/code>, mis sisaldab DRBD globaalset ja \u00fcldist konfiguratsiooni, ja me peame m\u00e4\u00e4ratlusse ressursid <code>.res<\/code> failides.<\/p>\n<p>Teeme varukoopia algsest failist m\u00f5lemas s\u00f5lmes ja seej\u00e4rel avame uue faili redigeerimiseks (kasutage oma lemmiktekstiredaktorit).<\/p>\n<pre><code class=\"bash\"># mv \/etc\/drbd.d\/global_common.conf \/etc\/drbd.d\/global_common.conf.orig\n# vim \/etc\/drbd.d\/global_common.conf <\/code><\/pre>\n<p>\nLisage m\u00f5lemasse faili j\u00e4rgmised read:<\/p>\n<pre><code class=\"bash\">global {\n usage-count  yes;\n}\ncommon {\n net {\n  protocol C;\n }\n}<\/code><\/pre>\n<p>\nSalvestage fail ja seej\u00e4rel sulgege redaktor.<\/p>\n<p>Vaatame korra rea protocol C peale. DRBD toetab kolme erinevat replikatsiooni re\u017eiimi (st kolme taseme s\u00fcnkroonsust), st:<\/p>\n<ul>\n<li>protocol A: as\u00fcnkroonse replikatsiooni protokoll; kasutatakse k\u00f5ige sagedamini suurte vahemaade replikatsioonil.<\/li>\n<li>protocol B: pool-s\u00fcnkroonse replikatsiooni protokoll v\u00f5i s\u00fcnkroonse m\u00e4lu protokoll.<\/li>\n<li>protocol C: kasutatakse tavaliselt l\u00fchikeste vahemaade v\u00f5rgu s\u00f5lmedes; see on kindlasti k\u00f5ige sagedamini kasutatav replikatsiooni protokoll DRBD seadistustes.<\/li>\n<\/ul>\n<p>\n<b>Oluline<\/b>: <i>Valiku protokollil replikatsioon m\u00f5jutab kahte juurutamise tegurit: kaitset ja viivitust. L\u00e4bip\u00e4\u00e4s, vastupidi, ei s\u00f5ltu oluliselt valitud replikatsiooniprotokollist.<\/i><\/p>\n<h4>Samm 4. Ressursi lisamine<\/h4>\n<p>\nRessurss (Resource) on kogum m\u00f5iste, mis viitab k\u00f5ikidele aspektidele konkreetsetest replitseeritavatest andmekogumitest. M\u00e4\u00e4ratleme oma ressursi failis <code>\/etc\/drbd.d\/test.res<\/code>.<\/p>\n<p>Lisage m\u00f5lema s\u00f5lme faili j\u00e4rgmist (\u00e4rge unustage asendada muutujad teie keskkonna tegelike v\u00e4\u00e4rtustega).<\/p>\n<p>Pange t\u00e4hele hostinimesid, peame m\u00e4\u00e4rama v\u00f5rgu hostinime, mille saab k\u00e4tte k\u00e4suga uname <code>-n<\/code>.<\/p>\n<pre><code class=\"bash\">resource test {\n        on tecmint.tecmint.lan {\n \t\tdevice \/dev\/drbd0;\n       \t\tdisk \/dev\/sdb1;\n        \t\tmeta-disk internal;\t\n                \taddress 192.168.56.101:7789;\n        }\n        on server1.tecmint.lan  {\n\t\tdevice \/dev\/drbd0;\n        \t\tdisk \/dev\/sdb1;\n        \t\tmeta-disk internal;\n                \taddress 192.168.56.102:7789;\n        }\n}\n}<\/code><\/pre>\n<p>\nkus:<\/p>\n<ul>\n<li><i>on hostname<\/i>: osa, millega seotud on sisemine konfigureerimise operaator.<\/li>\n<li><i>test<\/i>: see on uue ressursi nimi.<\/li>\n<li><i>device \/dev\/drbd0<\/i>: m\u00e4\u00e4rab uue virtuaalse plokkseadmestiku, mida haldab DRBD.<\/li>\n<li><i>disk \/dev\/sdb1<\/i>: see on plokkseadmestiku osa, mis on DRBD seadmekoopia varukoopia.<\/li>\n<li><i>meta-disk<\/i>: m\u00e4\u00e4rab, kus DRBD oma metainfot hoiab. 'Internal' t\u00e4hendab, et DRBD hoiab oma metainfot samal f\u00fc\u00fcsilisel madalal seadmel, kus asuvad tootmisandmed.<\/li>\n<li><i>aadress<\/i>: m\u00e4\u00e4rab vastava s\u00f5lme IP-aadressi ja pordi numbri.<\/li>\n<\/ul>\n<p>\nSamuti pidage meeles, et kui m\u00f5lemal hostil on parameetritel sama v\u00e4\u00e4rtus, v\u00f5ite need otse ressursi jaotises m\u00e4\u00e4rata.<\/p>\n<p>N\u00e4iteks v\u00f5ib \u00fclaltoodud konfiguratsiooni \u00fcmber struktureerida j\u00e4rgmiselt:<\/p>\n<pre><code class=\"bash\">resource test {\n\tdevice \/dev\/drbd0;\n\tdisk \/dev\/sdb1;\n        \tmeta-disk internal;\t\n        \ton tecmint.tecmint.lan {\n \t\taddress 192.168.56.101:7789;\n        \t}\n        \ton server1.tecmint.lan  {\n\t\taddress 192.168.56.102:7789;\n        \t\t}\n}<\/code><\/pre>\n<p><\/p>\n<h4>Samm 5. Ressursi initsialiseerimine ja k\u00e4ivitamine<\/h4>\n<p>\nDRBD-ga suhtlemiseks kasutame j\u00e4rgmisi haldust\u00f6\u00f6riistu (mis suhtlevad kernelimooduliga DRBD ressursside seadistamiseks ja haldamiseks):<\/p>\n<ul>\n<li><i>drbdadm<\/i>: DRBD k\u00f5rgtaseme haldust\u00f6\u00f6riist.<\/li>\n<li><i>drbdsetup<\/i>: madalama taseme haldust\u00f6\u00f6riist, mis \u00fchendab DRBD seadmeid nende varukohtadega, seadistab paaridest DRBD seadmed nende varukohtade peegeldamiseks ning kontrollib t\u00f6\u00f6tavate DRBD seadmete konfiguratsiooni.<\/li>\n<li><i>Drbdmeta<\/i>: metainfo haldamise t\u00f6\u00f6riist.<\/li>\n<\/ul>\n<p>\nP\u00e4rast k\u00f5igi algsete ressursikonfiguratsioonide lisamist peame ressursi m\u00f5lemasse s\u00f5lme kutsuma.<\/p>\n<pre><code class=\"bash\"># drbdadm create-md test<\/code><\/pre>\n<p>\n<img decoding=\"async\" alt=\"Seame DRBD k\u00f5rvale kahe CentOS 7 serveri salvestuse kopeerimiseks\" src=\"\/wp-content\/uploads\/2020\/07\/cf084d17f60a125225f2b75668515d4f.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Metainfot hoidva salvestuse initsialiseerimine<\/i><\/p>\n<p>Seej\u00e4rel peame seda k\u00e4ivitama, mis \u00fchendab ressursi selle varukoopiasse, seej\u00e4rel seadistab replikatsiooniseaded ja \u00fchendab ressursi oma paariga:<\/p>\n<pre><code class=\"bash\"># drbdadm up test<\/code><\/pre>\n<p>\nN\u00fc\u00fcd, kui k\u00e4ivitate k\u00e4su <noindex><a rel=\"nofollow\" href=\"https:\/\/www.tecmint.com\/commands-to-collect-system-and-hardware-information-in-linux\/\">lsblk<\/a><\/noindex>, m\u00e4rkate, et DRBD seadme\/mahu drbd0 on seotud varukohta <code>\/dev\/sdb1<\/code>:<\/p>\n<pre><code class=\"bash\"># lsblk<\/code><\/pre>\n<p>\n<img decoding=\"async\" alt=\"Seame DRBD k\u00f5rvale kahe CentOS 7 serveri salvestuse kopeerimiseks\" src=\"\/wp-content\/uploads\/2020\/07\/afb0be2e739c3ce71a556e78c8a55f07.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Plokkseadmestike loend<\/i><\/p>\n<p>Ressursi v\u00e4ltimiseks k\u00e4ivitage:<\/p>\n<pre><code class=\"bash\"># drbdadm down test<\/code><\/pre>\n<p>\nRessursi oleku kontrollimiseks k\u00e4ivitage j\u00e4rgmine k\u00e4sk (pange t\u00e4hele, et sel etapil eeldatakse, et kettade olek <i>Inconsistent\/Inconsistent<\/i>):<\/p>\n<pre><code class=\"bash\"># drbdadm status test\nOR\n# drbdsetup status test --verbose --statistics \t#for  a more detailed status<\/code><\/pre>\n<p>\n<img decoding=\"async\" alt=\"Seame DRBD k\u00f5rvale kahe CentOS 7 serveri salvestuse kopeerimiseks\" src=\"\/wp-content\/uploads\/2020\/07\/a45da69bfbc4199ef263359b623fdd05.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Ressursi oleku kontrollimine su<br \/>\nludes<\/i><\/p>\n<h4>Samm 6: Peamise ressursi\/algse seadme s\u00fcnkroonimise seadmine<\/h4>\n<p>\nDRBD on juba valmis t\u00f6\u00f6ks. N\u00fc\u00fcd peame m\u00e4\u00e4rama, millist s\u00f5lme kasutada algse seadistamise l\u00e4htepunktina.<\/p>\n<p>K\u00e4itage j\u00e4rgmist k\u00e4sku ainult \u00fches s\u00f5lmes, et alustada algset t\u00e4ielikku s\u00fcnkroniseerimist:<\/p>\n<pre><code class=\"bash\"># drbdadm primary --force test\n# drbdadm status test<\/code><\/pre>\n<p>\n<img decoding=\"async\" alt=\"Seame DRBD k\u00f5rvale kahe CentOS 7 serveri salvestuse kopeerimiseks\" src=\"\/wp-content\/uploads\/2020\/07\/6505d6350609e03da02f30eeafecd72c.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Seadistage p\u00f5hiss\u00f5lm algseks seadistamiseks<\/i><br \/>\nS\u00fcnkroniseerimise l\u00f5ppedes peaks m\u00f5lema ketta olukord olema UpToDate.<\/p>\n<h4>Samm 7: DRBD seadistuse testimine <\/h4>\n<p>\nL\u00f5puks peame kontrollima, kas DRBD seade t\u00f6\u00f6tab \u00f5igesti replikatsioonitud andmete salvestamiseks. Pidage meeles, et kasutasime t\u00fchja ketta mahtu, seega peame seadistama seadmele faili s\u00fcsteemi ja monteerima selle, et kontrollida, kas saame seda kasutada replikatsioonitud andmete salvestamiseks.<\/p>\n<p>Peame seadmele faili s\u00fcsteemi loomiseks k\u00e4ivitama j\u00e4rgmise k\u00e4su s\u00f5lmes, millelt alustasime algset t\u00e4ielikku s\u00fcnkroniseerimist (s\u00f5lm, millel on p\u00f5hijoon):<\/p>\n<pre><code class=\"bash\"># mkfs -t ext4 \/dev\/drbd0<\/code><\/pre>\n<p>\n<img decoding=\"async\" alt=\"Seame DRBD k\u00f5rvale kahe CentOS 7 serveri salvestuse kopeerimiseks\" src=\"\/wp-content\/uploads\/2020\/07\/32c9ac65a06993e58d9ce3b568fadca1.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Loome faili s\u00fcsteemi Drbd mahul<\/i><\/p>\n<p>Seej\u00e4rel monteerige see nagu n\u00e4idatud (v\u00f5ite andmiseks monteerimiskohale sobiva nime):<\/p>\n<pre><code class=\"bash\"># mkdir -p \/mnt\/DRDB_PRI\/\n# mount \/dev\/drbd0 \/mnt\/DRDB_PRI\/\n<\/code><\/pre>\n<p>\nKopeerige v\u00f5i looge n\u00fc\u00fcd m\u00f5ni fail \u00fclaltoodud monteerimiskohas ja looge pikk loend k\u00e4e kaudu <noindex><a rel=\"nofollow\" href=\"https:\/\/www.tecmint.com\/tag\/linux-ls-command\/\">k\u00e4sk ls<\/a><\/noindex>:<\/p>\n<pre><code class=\"bash\"># cd \/mnt\/DRDB_PRI\/\n# ls -l <\/code><\/pre>\n<p>\n<img decoding=\"async\" alt=\"Seame DRBD k\u00f5rvale kahe CentOS 7 serveri salvestuse kopeerimiseks\" src=\"\/wp-content\/uploads\/2020\/07\/a32321e2b5c587215dc06d2b3960a4bc.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Kuvage p\u00f5himaht Drbd sisu loend<\/i><\/p>\n<p>Seej\u00e4rel eemaldage seade (veenduge, et monteerimine ei oleks avatud, vahetage katalooge p\u00e4rast eemaldamist, et v\u00e4ltida vigu) ja muutke s\u00f5lme roll primaarsetelt sekundaarseteks:<\/p>\n<pre><code class=\"bash\"># umount \/mnt\/DRDB_PRI\/\n# cd\n# drbdadm secondary test<\/code><\/pre>\n<p>\nTeisest s\u00f5lmest (millel on ressurss sekundaarse rolliga) tehke primaarne, seej\u00e4rel \u00fchendage sellele seade ja viige l\u00e4bi pikk nimekiri monteerimiskohtadest. Kui seadistus t\u00f6\u00f6tab normaalselt, peaks k\u00f5ik ketas hoitud failid olema seal:<\/p>\n<pre><code class=\"bash\"># drbdadm primary test\n# mkdir -p \/mnt\/DRDB_SEC\/\n# mount \/dev\/drbd0 \/mnt\/DRDB_SEC\/\n# cd \/mnt\/DRDB_SEC\/\n# ls  -l <\/code><\/pre>\n<p>\n<img decoding=\"async\" alt=\"Seame DRBD k\u00f5rvale kahe CentOS 7 serveri salvestuse kopeerimiseks\" src=\"\/wp-content\/uploads\/2020\/07\/c54d7754a01987765a19b5bde95fc555.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Kontrollige DRBD seadistust, mis t\u00f6\u00f6tab sekundaarse s\u00f5lme peal.<\/i><\/p>\n<p>Lisainformatsiooni saamiseks vaadake haldustoodete abilehti:<\/p>\n<pre><code class=\"bash\"># man drbdadm\n# man drbdsetup\n# man drbdmeta<\/code><\/pre>\n<p>\nAbi: <noindex><a rel=\"nofollow\" href=\"https:\/\/docs.linbit.com\/docs\/users-guide-8.4\/\">DRBD kasutajamanuaal<\/a><\/noindex>.<\/p>\n<h4>Elulookirjeldus<\/h4>\n<p>\nDRBD on \u00e4\u00e4rmiselt paindlik ja mitmekesine, mist\u00f5ttu sobib see ladustamise replikatsiooni lahenduseks, millega saab lisada HA praktiliselt igasse rakendusse. K\u00e4esolevas artiklis n\u00e4itasime, kuidas DRBD installida CentOS 7-le, ja andsime l\u00fchikese \u00fclevaate selle kasutamisest ladustamise replikatsiooniks. Olete teretulnud jagama meile oma m\u00f5tteid alloleva tagasiside vormi kaudu.<\/p>\n<p>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/otus.pw\/17x7\/\">Tutvu kursusega l\u00e4hemalt.<\/a><\/noindex><\/p>\n<p>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/otus\/blog\/509710\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0435\u0440\u0435\u0432\u043e\u0434 \u0441\u0442\u0430\u0442\u044c\u0438 \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d \u0432 \u043f\u0440\u0435\u0434\u0434\u0432\u0435\u0440\u0438\u0438 \u0441\u0442\u0430\u0440\u0442\u0430 \u043a\u0443\u0440\u0441\u0430 \u00ab\u0410\u0434\u043c\u0438\u043d\u0438\u0441\u0442\u0440\u0430\u0442\u043e\u0440 Linux. \u0412\u0438\u0440\u0442\u0443\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f \u0438 \u043a\u043b\u0430\u0441\u0442\u0435\u0440\u0438\u0437\u0430\u0446\u0438\u044f\u00bb. DRBD (Distributed Replicated Block Device \u2014 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u0435 \u0440\u0435\u043f\u043b\u0438\u0446\u0438\u0440\u0443\u0435\u043c\u043e\u0435 \u0431\u043b\u043e\u0447\u043d\u043e\u0435 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u043e) \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 \u0441\u043e\u0431\u043e\u0439 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u043d\u043e\u0435, \u0433\u0438\u0431\u043a\u043e\u0435 \u0438 \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0430\u043b\u044c\u043d\u043e \u0440\u0435\u043f\u043b\u0438\u0446\u0438\u0440\u0443\u0435\u043c\u043e\u0435 \u0440\u0435\u0448\u0435\u043d\u0438\u0435 \u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u0434\u0430\u043d\u043d\u044b\u0445 \u0434\u043b\u044f Linux. \u041e\u043d\u043e \u043e\u0442\u0440\u0430\u0436\u0430\u0435\u0442 \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0435 \u0431\u043b\u043e\u0447\u043d\u044b\u0445 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432, \u0442\u0430\u043a\u0438\u0445 \u043a\u0430\u043a \u0436\u0435\u0441\u0442\u043a\u0438\u0435 \u0434\u0438\u0441\u043a\u0438, \u0440\u0430\u0437\u0434\u0435\u043b\u044b, \u043b\u043e\u0433\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0442\u043e\u043c\u0430 \u0438 \u0442.\u0434. \u043c\u0435\u0436\u0434\u0443 \u0441\u0435\u0440\u0432\u0435\u0440\u0430\u043c\u0438. \u041e\u043d\u043e \u0441\u043e\u0437\u0434\u0430\u0435\u0442 \u043a\u043e\u043f\u0438\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u043d\u0430 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":87365,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-87364","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041f\u0435\u0440\u0435\u0432\u043e\u0434 \u0441\u0442\u0430\u0442\u044c\u0438 \u043f\u043e\u0434\u0433\u043e\u0442\u043e\u0432\u043b\u0435\u043d \u0432 \u043f\u0440\u0435\u0434\u0434\u0432\u0435\u0440\u0438\u0438 \u0441\u0442\u0430\u0440\u0442\u0430 \u043a\u0443\u0440\u0441\u0430 \u00ab\u0410\u0434\u043c\u0438\u043d\u0438\u0441\u0442\u0440\u0430\u0442\u043e\u0440 Linux.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta 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