{"id":32682,"date":"2019-10-31T21:48:22","date_gmt":"2019-10-31T18:48:22","guid":{"rendered":"https:\/\/prohoster.info\/blog\/ishhem-problemu-ne-v-tom-meste\/"},"modified":"2019-10-31T21:48:22","modified_gmt":"2019-10-31T18:48:22","slug":"ishhem-problemu-ne-v-tom-meste","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/administrirovanie\/ishhem-problemu-ne-v-tom-meste","title":{"rendered":"H\u013ead\u00e1me probl\u00e9m nie tam, kde by sme mali.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Toto je kr\u00e1tky pr\u00edbeh z re\u00e1lnej praxe, ke\u010f sa mal\u00fd probl\u00e9m, dobre zamaskovan\u00fd vysokou dostupnos\u0165ou, stal bolestivou z\u00e1le\u017eitos\u0165ou.
\n<\/a><\/noindex><\/p>\n

Kr\u00e1tka dispoz\u00edcia:<\/h2>\n

\nMal\u00e1 pobo\u010dka m\u00e1 vlastn\u00fa \u00fastred\u0148u (Asterisk + FreePBX) na desktopovom hardv\u00e9ri a rovnak\u00fd lok\u00e1lny termin\u00e1lov\u00fd server s 1C, s\u00faborov\u00fdm \u00falo\u017eiskom a virtu\u00e1lnym dom\u00e9nov\u00fdm riadiacim syst\u00e9mom. Internet zdie\u013ea Mikrotik. Pobo\u010dka je mal\u00e1, im to sta\u010d\u00ed.
\nV\u0161etko sa za\u010dalo monitorovan\u00edm (kv\u00f4li nedostatku \u010dasu a lenivosti nemonitorujem v\u0161etko), ktor\u00e9 nahl\u00e1silo prehriatie jedn\u00e9ho servera<\/a> (s \u00fastred\u0148ou) na pobo\u010dke. K\u00fdm miestni rie\u0161ili probl\u00e9m, staru\u010dk\u00fd sa zasekol a trochu po\u0161kodil datab\u00e1zu MySQL.<\/p>\n

Mnoh\u00e9 nazna\u010dovalo ne\u0161\u0165astie, ale nie toto\u2026<\/h3>\n

\nNie je to probl\u00e9m, datab\u00e1zu opravili, v\u0161etko by malo fungova\u0165. Ale miestni si s\u0165a\u017euj\u00fa, hovory sa preru\u0161uj\u00fa. Dobre \u2014 probl\u00e9my vo FreePBX sa st\u00e1vaj\u00fa, vezmem z\u00e1lohu, rozbehnem ju, v\u0161etko je v poriadku.
\nA probl\u00e9m je na mieste, miestni sa st\u00e1le s\u0165a\u017euj\u00fa, hovory neprech\u00e1dzaj\u00fa norm\u00e1lne. Znie to, ako keby hovor prech\u00e1dzal norm\u00e1lne, ale ke\u010f sami volaj\u00fa alebo si volaj\u00fa navz\u00e1jom, vznikne nieko\u013ekosekundov\u00e9 oneskorenie. Za\u010d\u00ednam sk\u00fama\u0165 objemn\u00e9 a nezrozumite\u013en\u00e9 logy Asterisk a FreePBX, v nich sa probl\u00e9m n\u00e1js\u0165 nedar\u00ed. Spom\u00ednam si, \u017ee bola probl\u00e9m so STUN a ICE, ktor\u00e9 sp\u00f4sobilo podobn\u00e9 oneskorenie. Vyp\u00ednam v\u0161etko, v\u00fdsledok nulov\u00fd.<\/p>\n

Z\u00fafalstvo \u2014 cesta k prijatiu zl\u00fdch rozhodnut\u00ed:<\/h3>\n

\nPres\u00favam sa do z\u00fafalstva, dlh\u00e9 hodiny sk\u00famania \u00fastredne neprin\u00e1\u0161aj\u00fa ni\u010d dobr\u00e9ho, u\u017e je hlbok\u00e1 noc a probl\u00e9m nie je vyrie\u0161en\u00fd.
\nNechal som probl\u00e9m do r\u00e1na, v n\u00e1deji na \u010derstv\u00fa hlavu. R\u00e1no padlo \u010fal\u0161ie ne\u00faspe\u0161n\u00e9 rozhodnutie: pokia\u013e sa syst\u00e9m pokazil (aj ke\u010f sa za\u0161mykol nemohol by\u0165 tak\u00fd de\u0161trukt\u00edvny), pok\u00fa\u0161am sa opravi\u0165 syst\u00e9m prein\u0161talovan\u00edm v\u0161etk\u00fdch bal\u00ed\u010dkov. V\u00fdsledok je nie\u010do viac ako nula, oneskorenie sa skr\u00e1tilo (nie z\u00e1sadne, ale u\u017e je to \u00faspech).
\nPrij\u00edmam \u010fal\u0161ie zl\u00e9 rozhodnutie: ak mal\u00e1 oprava OS (a datab\u00e1zy zo z\u00e1lohy) mala mal\u00fd \u00faspech, a korene probl\u00e9mu s\u00fa st\u00e1le nejasn\u00e9, a pritom u\u017e bolo str\u00e1ven\u00e9 ve\u013emi ve\u013ea \u010dasu na h\u013eadan\u00ed pr\u00ed\u010diny, rozhodujem sa kona\u0165 radik\u00e1lne: zru\u0161\u00edme OS a nahr\u00e1me v\u0161etko z \u010dist\u00e9ho \u0161tartu (na\u0161\u0165astie automatiz\u00e1cia procesu to zvl\u00e1dne za prijate\u013en\u00fd \u010das). Nahr\u00e1vam konfigur\u00e1ciu FreePBX zo z\u00e1lohy. \u010eal\u0161ie zlyhanie. V\u00fdsledok nulov\u00fd.<\/p>\n

Bezradnos\u0165 \u2014 rozum sa zatmieva, rozhodnutia s\u00fa e\u0161te hor\u0161ie.<\/h3>\n

\nZ\u00fafalo sa c\u00edtim. Za\u010d\u00ednaj\u00fa prich\u00e1dza\u0165 \u00faplne hl\u00fape my\u0161lienky, mysl\u00edm si: mo\u017eno je konfigur\u00e1cia v z\u00e1lohe pokriven\u00e1 (mal som to tak po nieko\u013ek\u00fdch aktualiz\u00e1ci\u00e1ch, \u017ee po nich to nefungovalo a nena\u0161iel som pr\u00ed\u010dinu), ni\u010d in\u00e9 nezost\u00e1va: mus\u00edm v\u0161etko prein\u0161talova\u0165 odznova ru\u010dne. Ak\u00fd hanebn\u00fd z\u00e1\u017eitok! V\u00fdsledok je \u00faplne nulov\u00fd a navy\u0161e som str\u00e1vil obrovsk\u00e9 mno\u017estvo \u010dasu!<\/p>\n

Prijatie \u2014 cesta k uvedomeniu<\/h3>\n

\nV z\u00fafal\u00fdch pokusoch porozumie\u0165 tomu, \u010do sa deje, za\u010d\u00ednam d\u00f4kladne \u0161tudova\u0165 logy. V\u0161imol som si vzorec. Vyvolanie roz\u0161\u00edrenia nast\u00e1va presne po 5 sekund\u00e1ch, zatia\u013e \u010do pre skupinu vyvolan\u00ed z 3 roz\u0161\u00edren\u00ed za 15! Za\u010d\u00ednam googli\u0165 o oneskoren\u00ed vyvolania, ale u\u017e konkr\u00e9tne uv\u00e1dzam oneskorenie. A naraz\u00edm na odpove\u010f, ktor\u00fa som u\u017e na\u0161iel, \u013eudia hovoria, \u017ee probl\u00e9m je v DNS, ale ja presne viem, \u017ee probl\u00e9m nie je, v\u0161etky adresy sa prekladaj\u00fa!<\/p>\n

Zrejm\u00e9 \u2014 nie pravdepodobn\u00e9<\/h3>\n

\nNi\u010d in\u00e9 nezost\u00e1va, vezmem do r\u00fak nslookup a bingo (\u0161koda, \u017ee som to neurobil hne\u010f)! Prim\u00e1rny DNS le\u017e\u00ed (virtu\u00e1lka s kontrol\u00e9rom), a ja som si to ani nev\u0161imol! Keby bol len jeden DNS, hne\u010f by bola chyba \ud83d\ude09<\/p>\n

Z\u00e1ver<\/h3>\n

\nElement\u00e1rny probl\u00e9m, ktor\u00fd by mohol odhali\u0165 monitoring (ktor\u00fd sa oplat\u00ed nastavi\u0165 pre v\u0161etky uzly), zakryt\u00fd odolnos\u0165ou DNS, viedol k strate skoro dvoch pracovn\u00fdch dn\u00ed na rie\u0161enie hl\u00fapej situ\u00e1cie. Lenivos\u0165 je ve\u013ek\u00fd probl\u00e9m, nastavi\u0165 monitoring trv\u00e1 min\u00fatu \u2014 h\u013eadanie probl\u00e9mu tam, kde nie je \u2014 dva dni.<\/p>\n

Len registrovan\u00ed pou\u017e\u00edvatelia sa m\u00f4\u017eu z\u00fa\u010dastni\u0165 prieskumu. Prihl\u00e1ste sa<\/a><\/noindex>, pros\u00edm.<\/p>\n

Stalo sa v\u00e1m nie\u010do podobn\u00e9?<\/h2>\n