{"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\/cs\/blog\/administrirovanie\/ishhem-problemu-ne-v-tom-meste","title":{"rendered":"Hled\u00e1me probl\u00e9m na jin\u00e9m m\u00edst\u011b","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Toto je mal\u00fd p\u0159\u00edb\u011bh ze zku\u0161enosti, kdy se mal\u00fd probl\u00e9m, dob\u0159e skryt\u00fd rezistenc\u00ed syst\u00e9mu, st\u00e1v\u00e1 no\u010dn\u00ed m\u016frou.
\n<\/a><\/noindex><\/p>\n

Mal\u00e1 dispozice:<\/h2>\n

\nMal\u00e1 pobo\u010dka, m\u00e1 sv\u016fj PBX (Asterisk + FreePBX) na desktopov\u00e9m za\u0159\u00edzen\u00ed a tak\u00e9 m\u00edstn\u00ed termin\u00e1lov\u00fd server s 1C, souborov\u00fdm \u00falo\u017ei\u0161t\u011bm a virtu\u00e1ln\u00edm \u0159\u00edzen\u00edm dom\u00e9ny RO. Internet poskytuje Mikrotik. Pobo\u010dka je mal\u00e1, pro n\u011b je to dosta\u010duj\u00edc\u00ed.
\nV\u0161echno za\u010dalo sledov\u00e1n\u00edm (kv\u016fli nedostatku \u010dasu a lenosti nesleduji v\u0161echno), kter\u00e9 informovalo o p\u0159eh\u0159\u00e1t\u00ed jednoho serveru<\/a> (s PBX) na pobo\u010dce. Zat\u00edmco m\u00edstn\u00ed \u0159e\u0161ili probl\u00e9m, star\u00fd server zamrzl a trochu po\u0161kodil datab\u00e1zi MySQL.<\/p>\n

Mnoho nasv\u011bd\u010dovalo pot\u00ed\u017e\u00edm, ale ne tomuhle\u2026<\/h3>\n

\nNejhor\u0161\u00ed nen\u00ed, datab\u00e1ze byla opravena, v\u0161echno by m\u011blo fungovat. Ale m\u00edstn\u00ed si st\u011b\u017euj\u00ed, hovory p\u0159eru\u0161uj\u00ed. No jo \u2014 probl\u00e9my ve FreePBX se stanou, vezmu z\u00e1lohu, obnov\u00edm, v\u0161echno je v po\u0159\u00e1dku.
\nAle probl\u00e9m p\u0159etrv\u00e1v\u00e1, m\u00edstn\u00ed se st\u00e1le st\u011b\u017euj\u00ed, hovory neprob\u00edhaj\u00ed norm\u00e1ln\u011b. Zd\u00e1 se, \u017ee hovor k nim p\u0159ich\u00e1z\u00ed v po\u0159\u00e1dku, ale kdy\u017e sami volaj\u00ed nebo si volaj\u00ed navz\u00e1jem, vznik\u00e1 zpo\u017ed\u011bn\u00ed n\u011bkolika sekund. Za\u010d\u00edn\u00e1m zkoumat objemn\u00e9 a nesrozumiteln\u00e9 logy Asterisk a FreePBX, v nich\u017e se neda\u0159\u00ed probl\u00e9m odhalit. Vzpom\u00edn\u00e1m, byla tu probl\u00e9m se STUN a ICE, co\u017e zp\u016fsobovalo podobn\u00e9 zpo\u017ed\u011bn\u00ed. V\u0161echno vyp\u00edn\u00e1m, v\u00fdsledek nula.<\/p>\n

Deprese \u2014 cesta k p\u0159ijet\u00ed \u0161patn\u00fdch rozhodnut\u00ed:<\/h3>\n

\nUpad\u00e1m do deprese, dlouh\u00e9 hodiny \u0161\u0165our\u00e1n\u00ed se v PBX nevedou k ni\u010demu dobr\u00e9mu, u\u017e je hlubok\u00e1 noc a probl\u00e9m nen\u00ed vy\u0159e\u0161en.
\nNechal jsem probl\u00e9m do r\u00e1na, doufaje v \u010derstvou hlavu. R\u00e1no bylo p\u0159ijato dal\u0161\u00ed ne\u00fasp\u011b\u0161n\u00e9 rozhodnut\u00ed: jeliko\u017e se syst\u00e9m pokazil (i kdy\u017e zamrznut\u00ed nemohlo b\u00fdt tak destruktivn\u00ed), pokus\u00edm se syst\u00e9m opravit p\u0159einstalac\u00ed v\u0161ech bal\u00ed\u010dk\u016f. V\u00fdsledek je o trochu lep\u0161\u00ed ne\u017e nula, zpo\u017ed\u011bn\u00ed se zkr\u00e1tilo (ne v\u00fdznamn\u011b, ale u\u017e je to \u00fasp\u011bch).
\nP\u0159ij\u00edm\u00e1m dal\u0161\u00ed \u0161patn\u00e9 rozhodnut\u00ed: pokud \u010d\u00e1ste\u010dn\u00e1 oprava OS (a datab\u00e1ze ze z\u00e1lohy) m\u011bla mal\u00fd \u00fasp\u011bch, a ko\u0159en probl\u00e9mu st\u00e1le nen\u00ed jasn\u00fd, a z\u00e1rove\u0148 u\u017e bylo vynalo\u017eeno hodn\u011b \u010dasu na hled\u00e1n\u00ed p\u0159\u00ed\u010diny, rozhodnu se jednat radik\u00e1ln\u011b: zru\u0161\u00edme OS a naklonujeme v\u0161echno znovu (na\u0161t\u011bst\u00ed automatizace procesu to d\u011bl\u00e1 za p\u0159ijateln\u00fd \u010das). Nakl\u00e1d\u00e1m konfiguraci FreePBX ze z\u00e1lohy. Dal\u0161\u00ed ne\u00fasp\u011bch. V\u00fdsledek nula!<\/p>\n

Bezradnost - mysl je zast\u0159en\u00e1, rozhodnut\u00ed se st\u00e1vaj\u00ed je\u0161t\u011b hor\u0161\u00edmi<\/h3>\n

\nPadejte do bezradnosti. Za\u010d\u00ednaj\u00ed p\u0159ich\u00e1zet zcela \u0161patn\u00e9 my\u0161lenky, mysl\u00edm si: mo\u017en\u00e1 je konference v z\u00e1loze \u0161patn\u011b (mn\u011b se to stalo po n\u011bkolika aktualizac\u00edch, kdy to po nich nefungovalo a j\u00e1 u\u017e nena\u0161el p\u0159\u00ed\u010dinu), nic jin\u00e9ho nezb\u00fdv\u00e1: mus\u00edm v\u0161echno za\u010d\u00edt znovu ru\u010dn\u011b. Jak\u00fd ostud! V\u00fdsledek je zcela nulov\u00fd a je\u0161t\u011b jsem ztratil hromadu \u010dasu!<\/p>\n

P\u0159ijet\u00ed - cesta k uv\u011bdom\u011bn\u00ed<\/h3>\n

\nVe zoufal\u00fdch pokusech pochopit, co se d\u011bje, za\u010d\u00edn\u00e1m pe\u010dliv\u011b zkoumat logy. V\u0161iml jsem si z\u00e1konitosti. Vol\u00e1n\u00ed Extension prob\u00edh\u00e1 p\u0159esn\u011b za 5 sekund, a pro skupinu vol\u00e1n\u00ed ze 3 Extension za 15! Za\u010d\u00edn\u00e1m googlovat o zpo\u017ed\u011bn\u00ed vol\u00e1n\u00ed, ale u\u017e uv\u00e1d\u00edm konkr\u00e9tn\u00ed zpo\u017ed\u011bn\u00ed. A nar\u00e1\u017e\u00edm na u\u017e d\u0159\u00edve nalezenou odpov\u011b\u010f, lid\u00e9 \u0159\u00edkaj\u00ed, \u017ee probl\u00e9m je v DNS, ale j\u00e1 v\u00edm, \u017ee probl\u00e9m nen\u00ed, v\u0161echny adresy se resolveuj\u00ed!<\/p>\n

Evidentn\u00ed - nikoli pravd\u011bpodobn\u00e9<\/h3>\n

\nNen\u00ed co d\u011blat, vezmu do ruky nslookup a bingo (kdybych to ud\u011blal hned)! Prim\u00e1rn\u00ed DNS nefunguje (virtu\u00e1ln\u00ed stroj s kontrolerem), a j\u00e1 jsem si toho ani nev\u0161iml! Kdyby byl pouze jeden DNS, hned by byla chyba \ud83d\ude09<\/p>\n

V\u00fdsledek<\/h3>\n

\nElement\u00e1rn\u00ed probl\u00e9m, kter\u00fd by monitoring (kter\u00fd se mus\u00ed nastavovat pro v\u0161echny uzly) mohl vid\u011bt, zamaskovan\u00fd odolnost\u00ed DNS, vedl ke ztr\u00e1t\u011b t\u00e9m\u011b\u0159 dvou pracovn\u00edch dn\u00ed na \u0159e\u0161en\u00ed hloup\u00e9 situace. L\u00edn\u00e1 hlava - probl\u00e9m, nastavovat monitoring trv\u00e1 minutu - hledat probl\u00e9m tam, kde nen\u00ed - dva dny.<\/p>\n

Pouze registrovan\u00ed u\u017eivatel\u00e9 se mohou \u00fa\u010dastnit ankety. P\u0159ihlaste se<\/a><\/noindex>, pros\u00edm.<\/p>\n

Stalo se v\u00e1m n\u011bco podobn\u00e9ho?<\/h2>\n