{"id":1025,"date":"2021-05-06T10:09:46","date_gmt":"2021-05-06T10:09:46","guid":{"rendered":"https:\/\/dev.sourcecode.sk\/wsczkb\/?post_type=ht_kb&p=1025"},"modified":"2021-10-12T14:02:06","modified_gmt":"2021-10-12T12:02:06","slug":"nedostatek-ram-pameti-na-virtualnim-serveru","status":"publish","type":"ht_kb","link":"https:\/\/www.websupport.cz\/podpora\/kb\/nedostatek-ram-pameti-na-virtualnim-serveru\/","title":{"rendered":"Nedostatek RAM pam\u011bti na virtu\u00e1ln\u00edm serveru"},"content":{"rendered":"\n

Mno\u017estv\u00ed pam\u011bti RAM m\u00e1 pravd\u011bpodobn\u011b nejv\u011bt\u0161\u00ed dopad na v\u00fdkon va\u0161eho\u00a0virtu\u00e1ln\u00edho serveru (VPS)<\/a>\u00a0a na po\u010det n\u00e1v\u0161t\u011bvn\u00edk\u016f, kter\u00fd dok\u00e1\u017ee obslou\u017eit. Nedostatek pam\u011bti RAM se m\u016f\u017ee projevit v\u00edcer\u00fdmi zp\u016fsoby, nej\u010dast\u011bji v\u0161ak nestabilitou b\u011b\u017e\u00edc\u00edch slu\u017eeb jako FTP nebo MySQL server, nebo dlouh\u00fdmi na\u010d\u00edtac\u00edmi \u010dasy str\u00e1nek.<\/p>\n\n\n\n

M\u00e1 moje VPS probl\u00e9m s nedostatkem RAM?<\/strong><\/h3>\n\n\n\n
\n\n\n\n

Aktu\u00e1ln\u00ed stav pam\u011bti RAM je mo\u017en\u00e9 zkontrolovat po p\u0159ihl\u00e1\u0161en\u00ed na SSH<\/a>: u\u017eivatelsky p\u0159\u00edv\u011btiv\u00e9 zobrazen\u00ed poskytuje program htop:<\/p>\n\n\n\n

\"\"
V tomto p\u0159\u00edpad\u011b m\u00e1 server obsazen\u00fdch 2847MB RAM z celkov\u00fdch 4096MB.<\/em>
<\/figcaption><\/figure>\n\n\n\n

Mo\u017en\u00e9 p\u0159\u00edznaky nedostatku RAM<\/strong><\/h3>\n\n\n\n
\n\n\n\n

1. Na\u010d\u00edt\u00e1n\u00ed str\u00e1nek trv\u00e1 o mnoho d\u00e9le ne\u017e oby\u010dejn\u011b.<\/strong><\/h4>\n\n\n\n

Zv\u00fd\u0161en\u00e1 n\u00e1v\u0161t\u011bvnost str\u00e1nek na VPS m\u016f\u017ee m\u00edt za n\u00e1sledek zv\u00fd\u0161en\u00e9 pam\u011b\u0165ov\u00e9 n\u00e1roky. Pokud VPS nedok\u00e1\u017ee dr\u017eet v\u0161echny pr\u00e1v\u011b na\u010d\u00edtan\u00e9 webstr\u00e1nky v RAM, za\u010dne pou\u017e\u00edvat tzv. virtu\u00e1ln\u00ed pam\u011b\u0165 (swap partition, obdoba str\u00e1nkovac\u00edho souboru Windows). Tato dopl\u0148kov\u00e1 pam\u011b\u0165 je v\u0161ak n\u011bkolikan\u00e1sobn\u011b pomalej\u0161\u00ed ne\u017e RAM, a tak p\u0159i jej\u00edm vyu\u017eit\u00ed doch\u00e1z\u00ed k drastick\u00e9mu sn\u00ed\u017een\u00ed v\u00fdkonu VPS.<\/p>\n\n\n\n

Tomuto chov\u00e1n\u00ed m\u016f\u017eeme zabr\u00e1nit bu\u010f nav\u00fd\u0161en\u00edm dostupn\u00e9 pam\u011bti RAM, nebo omezen\u00edm mno\u017estv\u00ed RAM, kterou m\u016f\u017ee webserver spot\u0159ebovat.<\/p>\n\n\n\n

Trochu matematiky<\/strong><\/p>\n\n\n\n

U ka\u017ed\u00e9ho na\u010d\u00edt\u00e1n\u00ed str\u00e1nky se na pozad\u00ed spust\u00ed PHP proces, kter\u00fd ze zdrojov\u00fdch soubor\u016f vygeneruje v\u00fdsledn\u00fd HTML k\u00f3d, kter\u00fd m\u016f\u017ee odeslat prohl\u00ed\u017ee\u010di. B\u011bhem tohoto procesu spot\u0159ebuje PHP ur\u010dit\u00e9 mno\u017estv\u00ed pam\u011bti RAM, kter\u00e9 z\u00e1le\u017e\u00ed na aplikaci – WordPress v z\u00e1kladn\u00ed instalaci vysta\u010d\u00ed s 48MB, kde\u017eto Drupal s n\u011bkolika pozap\u00ednan\u00fdmi pluginy si m\u016f\u017ee vy\u017e\u00e1dat n\u011bkolik stovek MB RAM. Toto mno\u017estv\u00ed se n\u00e1sob\u00ed s ka\u017ed\u00fdm dal\u0161\u00edm n\u00e1v\u0161t\u011bvn\u00edkem str\u00e1nky – pokud si n\u00e1\u0161 hypotetick\u00fd WordPress prohl\u00ed\u017e\u00ed nar\u00e1z deset n\u00e1v\u0161t\u011bvn\u00edk\u016f, spot\u0159ebuj\u00ed spolu 10 x 48 = 480MB RAM.<\/p>\n\n\n\n

Pokud m\u00e1 na\u0161e VPS dostupn\u00fdch 512MB RAM, dok\u00e1\u017ee obslou\u017eit 10 n\u00e1v\u0161t\u011bvn\u00edk\u016f, ale u jeden\u00e1ct\u00e9ho mu dojde dostupn\u00e1 RAM pam\u011b\u0165 a za\u010dne swapovat na disk. Pro zachov\u00e1n\u00ed optim\u00e1ln\u00edho v\u00fdkonu n\u00e1m Apache webserver nab\u00edz\u00ed mo\u017enost omezit po\u010det n\u00e1v\u0161t\u011bvn\u00edk\u016f (klient\u016f), kter\u00e9 bude nar\u00e1z obsluhovat. <\/p>\n\n\n\n

N\u00e1v\u0161t\u011bvn\u00edci, kte\u0159\u00ed p\u0159ekro\u010d\u00ed tento limit p\u0159i pokusu o na\u010d\u00edt\u00e1n\u00ed str\u00e1nky dostanou okam\u017eit\u011b chybovou hl\u00e1\u0161ku. Toto m\u016f\u017ee zn\u00edt kontraproduktivn\u011b, ale ve v\u011bt\u0161in\u011b p\u0159\u00edpad\u016f je ide\u00e1ln\u011bj\u0161\u00ed, pokud server pracuje na pln\u00fd v\u00fdkon pro v\u0161echny n\u00e1v\u0161t\u011bvn\u00edky kter\u00e9 zvl\u00e1dne, ne\u017e aby se sna\u017eil obslou\u017eit v\u0161ech a zasekl se p\u0159i tom.<\/p>\n\n\n\n

Limitujeme n\u00e1v\u0161tevn\u00edky<\/strong><\/p>\n\n\n\n

Nastaven\u00ed, kter\u00e9 limituje po\u010det soub\u011b\u017en\u011b b\u011b\u017e\u00edc\u00edch proces\u016f se naz\u00fdv\u00e1 MaxClients v Apache 2.2 (dod\u00e1van\u00e9ho s Ubuntu 12.04) a MaxRequestWorkers v Apache 2.4 (Ubuntu 14.04). M\u016f\u017eeme ho upravit v n\u00e1sledovn\u00fdch konfigura\u010dn\u00edch souborech:<\/p>\n\n\n\n

Apache 2.2: \/etc\/apache2\/apache2.conf:<\/p>\n\n\n\n

<IfModule mpm_prefork_module><\/p>\n\n\n\n

    StartServers                5 <\/p>\n\n\n\n

    MinSpareServers             5 <\/p>\n\n\n\n

    MaxSpareServers             5<\/p>\n\n\n\n

    MaxClients                  150<\/p>\n\n\n\n

    ServerLimit                 150<\/p>\n\n\n\n

    MaxRequestsPerChild         200 <\/p>\n\n\n\n

<\/IfModule><\/p>\n\n\n\n

Apache 2.4: \/etc\/apache2\/mods-enabled\/mpm_prefork.conf<\/p>\n\n\n\n

<IfModule mpm_prefork_module><\/p>\n\n\n\n

        StartServers             5<\/p>\n\n\n\n

        MinSpareServers          5<\/p>\n\n\n\n

        MaxSpareServers          10<\/p>\n\n\n\n

        MaxRequestWorkers        150<\/p>\n\n\n\n

        MaxConnectionsPerChild   0<\/p>\n\n\n\n

<\/IfModule><\/p>\n\n\n\n

Aby webserver za\u010dal pou\u017e\u00edvat nov\u00e9 hodnoty, restartujeme ho pomoc\u00ed p\u0159\u00edkazu apache2ctl\u200c restart.<\/p>\n\n\n\n

2. Nem\u016f\u017eu se p\u0159ipojit na FTP \/ str\u00e1nky se neum\u00ed p\u0159ipojit na MySQL server.<\/strong><\/h4>\n\n\n\n

K p\u00e1d\u016fm n\u00e1hodn\u00fdch slu\u017eeb na virtu\u00e1ln\u00edm serveru m\u016f\u017ee t\u00e9\u017e doj\u00edt kv\u016fli nedostatku pam\u011bti RAM. Opera\u010dn\u00ed syst\u00e9m m\u016f\u017ee nedostatek pam\u011bti vyhodnotit jako probl\u00e9m br\u00e1n\u00edc\u00ed ve stabiln\u00edm b\u011bhu serveru a ukon\u010d\u00ed tak procesy \u201cs n\u00edzkou prioritou\u201d, mezi kter\u00e9 pat\u0159\u00ed nap\u0159\u00edklad MySQL server nebo FTP server (proFTPd). Proces, kter\u00fd se o takov\u00e9 recyklov\u00e1n\u00ed syst\u00e9mov\u00fdch prost\u0159edk\u016f star\u00e1, je l\u00e1skypln\u011b naz\u00fdvan\u00fd OOM (out-of-memory) killer.<\/p>\n\n\n\n

Jak zjist\u00edme, \u017ee jsme se stali ob\u011bt\u00ed OOM killeru? Kdy\u017e se k VPS p\u0159ipoj\u00edme p\u0159es SSH, m\u016f\u017eeme zkontrolovat n\u011bkter\u00e9 syst\u00e9mov\u00e9 logy, ve kter\u00fdch je jeho \u010dinnost zaznamen\u00e1van\u00e1:<\/p>\n\n\n\n

root@mojevps# dmesg | grep memory<\/p>\n\n\n\n

[8274699.045685] Out of memory: Kill process 7793 (mysqld) score 579 or sacrifice child<\/p>\n\n\n\n

root@mojevps# grep memory \/var\/log\/syslog<\/p>\n\n\n\n

Nov 11 14:57:01 mojevps kernel: [8274699.045685] Out of memory: Kill process 7793 (mysqld) score 579 or sacrifice child<\/p>\n\n\n\n

Podle uveden\u00fdch z\u00e1znam\u016f byl kv\u016fli nedostatku pam\u011bti \u201czabit\u00fd\u201d MySQL server.<\/p>\n\n\n\n

Op\u011btovn\u00e9 nastartov\u00e1n\u00ed slu\u017eeb<\/p>\n\n\n\n

Slu\u017eby, kter\u00e9 byly takto \u201czabit\u00e9\u201d, je mo\u017en\u00e9 nastartovat dv\u011bma zp\u016fsoby. Pokud jsme na serveru p\u0159ihl\u00e1\u0161en\u00ed p\u0159es SSH, slu\u017eby m\u016f\u017eeme nastartovat pomoc\u00ed:<\/p>\n\n\n\n

\/etc\/init.d\/mysql start # (v p\u0159\u00edpad\u011b p\u00e1du MySQL serveru)<\/p>\n\n\n\n

\/etc\/init.d\/proftpd start # (v p\u0159\u00edpad\u011b p\u00e1du FTP serveru)<\/p>\n\n\n\n

Alternativn\u011b m\u016f\u017eeme p\u0159es Webadmin restartovat cel\u00e9 VPS, co\u017e tak\u00e9 zprovozn\u00ed nefunk\u010dn\u00ed slu\u017eby.<\/p>\n\n\n\n

Nav\u00fd\u0161en\u00ed parametr\u016f VPS<\/strong><\/h3>\n\n\n\n
\n\n\n\n

V p\u0159\u00edpad\u011b, \u017ee se VPS rozhodlo spustit OOM-killer, krom\u011b pam\u011bti RAM mu do\u0161la i \u201cvirtu\u00e1ln\u00ed\u201d pam\u011b\u0165 (str\u00e1nkovac\u00ed partice, obdoba str\u00e1nkovac\u00edho souboru Windows).<\/p>\n\n\n\n

Virtu\u00e1ln\u00ed servery VPS jsou standardn\u011b vytv\u00e1\u0159en\u00e9 se swap partition o velikosti 1GB. Pokud opera\u010dn\u00ed syst\u00e9m spustil OOM killer, je vhodn\u00e9 pam\u011b\u0165 RAM nav\u00fd\u0161it minim\u00e1ln\u011b o tento 1GB.<\/p>\n\n\n\n

O nav\u00fd\u0161en\u00ed parametr\u016f VPS se dozv\u00edte v\u00edce\u00a0zde<\/a>.<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Mno\u017estv\u00ed pam\u011bti RAM m\u00e1 pravd\u011bpodobn\u011b nejv\u011bt\u0161\u00ed dopad na v\u00fdkon va\u0161eho\u00a0virtu\u00e1ln\u00edho serveru (VPS)\u00a0a na po\u010det n\u00e1v\u0161t\u011bvn\u00edk\u016f, kter\u00fd dok\u00e1\u017ee obslou\u017eit. Nedostatek pam\u011bti RAM se m\u016f\u017ee projevit v\u00edcer\u00fdmi zp\u016fsoby, nej\u010dast\u011bji v\u0161ak nestabilitou b\u011b\u017e\u00edc\u00edch slu\u017eeb jako FTP nebo MySQL server, nebo dlouh\u00fdmi na\u010d\u00edtac\u00edmi \u010dasy str\u00e1nek. M\u00e1 moje VPS probl\u00e9m s nedostatkem RAM? Aktu\u00e1ln\u00ed stav…<\/p>\n","protected":false},"author":3,"template":"","format":"standard","meta":{"footnotes":""},"ht-kb-category":[48],"ht-kb-tag":[],"class_list":["post-1025","ht_kb","type-ht_kb","status-publish","format-standard","hentry","ht_kb_category-vps"],"yoast_head":"\nNedostatek RAM pam\u011bti na virtu\u00e1ln\u00edm serveru - Websupport Centrum n\u00e1pov\u011bdy<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.websupport.cz\/podpora\/kb\/nedostatek-ram-pameti-na-virtualnim-serveru\/\" \/>\n<meta property=\"og:locale\" content=\"cs_CZ\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Nedostatek RAM pam\u011bti na virtu\u00e1ln\u00edm serveru - Websupport Centrum n\u00e1pov\u011bdy\" \/>\n<meta property=\"og:description\" content=\"Mno\u017estv\u00ed pam\u011bti RAM m\u00e1 pravd\u011bpodobn\u011b nejv\u011bt\u0161\u00ed dopad na v\u00fdkon va\u0161eho\u00a0virtu\u00e1ln\u00edho serveru (VPS)\u00a0a na po\u010det n\u00e1v\u0161t\u011bvn\u00edk\u016f, kter\u00fd dok\u00e1\u017ee obslou\u017eit. Nedostatek pam\u011bti RAM se m\u016f\u017ee projevit v\u00edcer\u00fdmi zp\u016fsoby, nej\u010dast\u011bji v\u0161ak nestabilitou b\u011b\u017e\u00edc\u00edch slu\u017eeb jako FTP nebo MySQL server, nebo dlouh\u00fdmi na\u010d\u00edtac\u00edmi \u010dasy str\u00e1nek. M\u00e1 moje VPS probl\u00e9m s nedostatkem RAM? 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