{"id":33803,"date":"2019-10-31T21:54:45","date_gmt":"2019-10-31T18:54:45","guid":{"rendered":"https:\/\/prohoster.info\/blog\/on-vam-ne-drook\/"},"modified":"2019-10-31T21:54:45","modified_gmt":"2019-10-31T18:54:45","slug":"on-vam-ne-drook","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/administrirovanie\/on-vam-ne-drook","title":{"rendered":"On nie je v\u00e1\u0161 dRook","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V s\u00favislosti s rast\u00facou popularitou Rook sa chcem porozpr\u00e1va\u0165 o jeho skryt\u00fdch probl\u00e9moch a v\u00fdzvach, ktor\u00e9 na v\u00e1s \u010dakaj\u00fa.<\/p>\n

O sebe: Sk\u00fasenosti s administr\u00e1ciou Ceph od verzie Hammer, zakladate\u013e komunity t.me\/ceph_sk<\/a><\/noindex> na Telegrame.<\/p>\n

Aby som nebol bez d\u00f4kazov, budem sa odvol\u00e1va\u0165 na \u010dl\u00e1nky z Habr, ktor\u00e9 sa zaoberaj\u00fa probl\u00e9mami s Ceph (pod\u013ea hodnotenia). S v\u00e4\u010d\u0161inou t\u00fdchto probl\u00e9mov som sa tie\u017e stretol. Odkazy na pou\u017eit\u00e9 materi\u00e1ly s\u00fa na konci \u010dl\u00e1nku.<\/p>\n

V \u010dl\u00e1nku o Rooku spom\u00edname Ceph nie n\u00e1hodou \u2014 Rook je v podstate Ceph zabalen\u00fd do Kubernetes, a preto zdedil v\u0161etky jeho probl\u00e9my. Za\u010dneme probl\u00e9mami Ceph.
\n<\/a><\/noindex><\/p>\n

Zjednodu\u0161enie spr\u00e1vy klastra<\/h3>\n

\nJedn\u00fdm z v\u00fdhod Rooku je pohodln\u00e9 riadenie Ceph cez Kubernetes.<\/p>\n

Ceph v\u0161ak obsahuje viac ako 1000 parametrov na konfigur\u00e1ciu, z ktor\u00fdch cez Rook m\u00f4\u017eeme upravova\u0165 len men\u0161iu \u010das\u0165.<\/p>\n

Pr\u00edklad na Luminous
\n> ceph daemon mon.a config show | wc -l
\n1401<\/p><\/blockquote>\n

Rook je pozicionovan\u00fd ako pohodln\u00fd sp\u00f4sob in\u0161tal\u00e1cie a aktualiz\u00e1cie Ceph.<\/b>
\nS in\u0161tal\u00e1ciou Ceph bez Rooku nie s\u00fa \u017eiadne probl\u00e9my \u2014 Ansible playbook sa nap\u00ed\u0161e za 30 min\u00fat, ale s aktualiz\u00e1ciou s\u00fa ve\u013ek\u00e9 probl\u00e9my. <\/p>\n

Cit\u00e1t z \u010dl\u00e1nku Krok<\/i><\/p>\n

Pr\u00edklad: nespr\u00e1vna funkcia Crush tunables po aktualiz\u00e1cii z Hammer na Jewel<\/p>\n

> ceph osd crush show-tunables
\n{
\n\u2026
\n \u00abstraw_calc_version\u00bb: 1,
\n \u00aballowed_bucket_algs\u00bb: 22,
\n \u00abprofile\u00bb: \u00abunknown\u00bb,
\n \u00aboptimal_tunables\u00bb: 0,
\n\u2026
\n}<\/p><\/blockquote>\n

Ale aj v r\u00e1mci men\u0161\u00edch verzi\u00ed sa m\u00f4\u017eu vyskytn\u00fa\u0165 probl\u00e9my.<\/p>\n

Pr\u00edklad: Aktualiz\u00e1cia 12.2.6 vedie klaster do stavu health err a podmiene\u010dne po\u0161koden\u00fd PG.
\nceph.com\/releases\/v12-2-8-released<\/a><\/noindex><\/p>\n

Neaktualizova\u0165, \u010daka\u0165 a testova\u0165? Ale predsa len pou\u017e\u00edvame Rook predov\u0161etk\u00fdm kv\u00f4li pohodlnosti aktualiz\u00e1ci\u00ed.<\/p>\n

Zlo\u017eitosti disaster recovery klastra v Rooku <\/h3>\n

\nPr\u00edklad: OSD zlyh\u00e1va s chybami, ktor\u00e9 s\u00e1m vytv\u00e1ra. Podozrievate, \u017ee probl\u00e9m je v jednom z parametrov v konfigur\u00e1cii, chcete zmeni\u0165 konfigur\u00e1ciu pre konkr\u00e9tny d\u00e9mon, ale nem\u00f4\u017eete, preto\u017ee m\u00e1te Kubernetes a DaemonSet.<\/p>\n

Alternat\u00edvy nie s\u00fa. Ceph tell osd.Num injectargs nefunguje \u2014 OSD je predsa mimo prev\u00e1dzky.<\/p>\n

Zlo\u017eitosti debugovania<\/h3>\n

\nPre niektor\u00e9 nastavenia a testy v\u00fdkonu je potrebn\u00e9 sa pripoji\u0165 priamo k socketu d\u00e9monu OSD. V pr\u00edpade Rooku je najprv potrebn\u00e9 n\u00e1js\u0165 spr\u00e1vny kontajner, potom sa do\u0148 dosta\u0165, objavi\u0165 ch\u00fdbaj\u00face debugovacie n\u00e1stroje a ve\u013emi sa sklama\u0165.<\/p>\n

Zlo\u017eitosti sekven\u010dn\u00e9ho sp\u00fa\u0161\u0165ania OSD<\/h3>\n

\nPr\u00edklad: OSD zlyh\u00e1va pri OOM, za\u010d\u00edna rebalance, a potom zlyh\u00e1vaj\u00fa \u010fal\u0161ie.<\/p>\n

Rie\u0161enie: Spusti\u0165 OSD jednotku po jednej, \u010daka\u0165 na jej \u00fapln\u00e9 pripojenie do klastru a potom spusti\u0165 nasleduj\u00face. (Viac v spr\u00e1ve Ceph. Anatomia katastrofy).<\/p>\n

V pr\u00edpade baremetal in\u0161tal\u00e1cie sa to rob\u00ed jednoducho manu\u00e1lne, v pr\u00edpade Rook a jednej OSD na uzol nie s\u00fa probl\u00e9my, komplik\u00e1cie so sekven\u010dn\u00fdm sp\u00fa\u0161\u0165an\u00edm vznikn\u00fa, ak OSD > 1 na uzol. <\/p>\n

Samozrejme, s\u00fa rie\u0161ite\u013en\u00e9, ale ve\u010f prin\u00e1\u0161ame Rook na zjednodu\u0161enie, a dost\u00e1vame komplik\u00e1cie.<\/p>\n

Zlo\u017eitosti pri nastavovan\u00ed limitov pre ceph d\u00e9monov.<\/h3>\n

\nPre baremetal in\u0161tal\u00e1ciu ceph je dos\u0165 jednoduch\u00e9 vypo\u010d\u00edta\u0165 potrebn\u00e9 zdroje na klastru \u2014 existuj\u00fa vzorce a \u0161t\u00fadie. Pri pou\u017eit\u00ed slab\u00fdch CPU aj tak budete musie\u0165 vykona\u0165 nieko\u013eko testov v\u00fdkonnosti, zisti\u0165, \u010do je Numa, ale st\u00e1le je to jednoduch\u0161ie ako v Rook.<\/p>\n

V pr\u00edpade Rook sa okrem limitov pam\u00e4te, ktor\u00e9 sa daj\u00fa vypo\u010d\u00edta\u0165, objav\u00ed ot\u00e1zka nastavenia limitu CPU.<\/p>\n

A tu sa budete musie\u0165 potr\u00e1pi\u0165 s testami v\u00fdkonnosti. Pri nastaven\u00ed n\u00edzkych limitov dostanete pomal\u00fd klaster, pri nastaven\u00ed unlim dostanete akt\u00edvne vyu\u017eitie CPU pri rebalance, \u010do zle vpl\u00fdva na va\u0161e aplik\u00e1cie v kubernetes.<\/p>\n

Probl\u00e9my so sie\u0165ovou interakciou v1.<\/h3>\n

\nPre ceph sa odpor\u00fa\u010da pou\u017e\u00edva\u0165 2x10gb sie\u0165. Jednu pre klientsky traffic, druh\u00fa pre spr\u00e1vne potreby ceph (rebalance). Ak \u017eijete s ceph na baremetal, t\u00e1to separ\u00e1cia sa \u013eahko nastavuje, ak \u017eijete s Rook, separ\u00e1cia pod\u013ea siet\u00ed sp\u00f4sob\u00ed probl\u00e9my, preto\u017ee nie ka\u017ed\u00fd konfigur\u00e1cia klastru umo\u017e\u0148uje poskytn\u00fa\u0165 do podu dve r\u00f4zne siete.<\/p>\n

Probl\u00e9my so sie\u0165ovou interakciou v2.<\/h3>\n

\nAk sa vzd\u00e1te separ\u00e1cie siet\u00ed, pri rebalance traffic ceph zapln\u00ed cel\u00fd kan\u00e1l a va\u0161e aplik\u00e1cie v kubernetes sa bud\u00fa spomali\u0165 alebo spadn\u00fa. R\u00fdchlos\u0165 rebalance ceph sa d\u00e1 zn\u00ed\u017ei\u0165, ale za cenu dlh\u0161ej doby rebalance zv\u00fd\u0161ite riziko v\u00fdpadku druh\u00e9ho uzla z klastru kv\u00f4li diskom alebo OOM, a tam u\u017e je garantovan\u00fd iba read only na klaster.<\/p>\n

Dlh\u00fd rebalance \u2014 dlh\u00e9 spomalenia aplik\u00e1ci\u00ed.<\/h3>\n

\nCit\u00e1t z pr\u00edspevku Ceph. Anatomia katastrofy.<\/i><\/p>\n

V\u00fdkon testovacieho klastru:<\/p>\n

Oper\u00e1cia z\u00e1pisu ve\u013ekosti 4 KByte trv\u00e1 1 ms, v\u00fdkon 1000 oper\u00e1ci\u00ed\/sekundu v 1 vl\u00e1kne.<\/p>\n

Oper\u00e1cia ve\u013ekosti 4 MByte (ve\u013ekos\u0165 objektu) trv\u00e1 22 ms, v\u00fdkon 45 oper\u00e1ci\u00ed\/sekundu.<\/p>\n

Ke\u010f jeden z troch dom\u00e9n zlyh\u00e1, klaster je na ist\u00fd \u010das v degradovanom stave, pri\u010dom polovica hor\u00facich objektov sa roz\u0161\u00edri po r\u00f4znych verzi\u00e1ch, tak\u017ee polovica z\u00e1pisov\u00fdch oper\u00e1ci\u00ed sa za\u010dne n\u00faten\u00fdm obnoven\u00edm.<\/p>\n

\u010cas n\u00faten\u00e9ho obnovenia odhadujeme pribli\u017ene \u2014 z\u00e1pisov\u00e9 oper\u00e1cie na degradovan\u00fd objekt.<\/p>\n

Najprv \u010d\u00edtame 4 MB za 22 ms, zapisujeme 22 ms, a potom 1 ms zapisujeme 4 kB skuto\u010dn\u00fdch d\u00e1t. Celkovo 45 ms na jednu z\u00e1pisov\u00fa oper\u00e1ciu na degradovan\u00fd objekt na SSD, ke\u010f be\u017en\u00e1 v\u00fdkon bola 1 ms \u2014 pokles v\u00fdkonu o 45-n\u00e1sobok.<\/p>\n

\u010c\u00edm v\u00e4\u010d\u0161\u00ed je percentu\u00e1lny podiel degradovan\u00fdch objektov, t\u00fdm hor\u0161ie sa to st\u00e1va.<\/p><\/blockquote>\n

R\u00fdchlos\u0165 rebalancovania je kriticky d\u00f4le\u017eit\u00e1 pre spr\u00e1vnu funkciu klastra.<\/p>\n

\u0160pecifick\u00e9 nastavenia serverov pre ceph<\/h3>\n

\nceph m\u00f4\u017ee vy\u017eadova\u0165 \u0161pecifick\u00e9 ladenie hostite\u013ea. <\/p>\n

Pr\u00edklad: nastavenia sysctl a JumboFrame, niektor\u00e9 z t\u00fdchto nastaven\u00ed m\u00f4\u017eu negat\u00edvne ovplyvni\u0165 v\u00e1\u0161 payload.<\/p>\n

Skuto\u010dn\u00e1 potreba Rook zost\u00e1va ot\u00e1zna<\/h3>\n

\nAk m\u00e1te v cloude \u00falo\u017eisko od v\u00e1\u0161ho cloudov\u00e9ho poskytovate\u013ea, je to ove\u013ea pohodlnej\u0161ie. <\/p>\n

Ak ste na svojich serveroch, spr\u00e1va ceph bude jednoduch\u0161ia bez kubernetes. <\/p>\n

Prenaj\u00edmate si servery v nejakom low cost hostingu? Potom v\u00e1s \u010dak\u00e1 mnoho z\u00e1bavy so sie\u0165ou, jej oneskoreniami a \u0161\u00edrkou p\u00e1sma, \u010do jasne negat\u00edvne ovplyv\u0148uje ceph.<\/p>\n

Celkovo:<\/b> Implement\u00e1cia kuberentes a implement\u00e1cia \u00falo\u017eiska s\u00fa r\u00f4zne \u00falohy s r\u00f4znymi vstupmi a r\u00f4znymi mo\u017enos\u0165ami rie\u0161en\u00ed \u2014 mie\u0161a\u0165 ich znamen\u00e1 robi\u0165 potenci\u00e1lne nebezpe\u010dn\u00fd trade-off v prospech jedn\u00e9ho alebo druh\u00e9ho. Spoji\u0165 tieto rie\u0161enia bude ve\u013emi \u0165a\u017ek\u00e9 aj v etape projektovania, a je tu e\u0161te obdobie prev\u00e1dzky.<\/p>\n

Zoznam pou\u017eitej literat\u00fary:<\/p>\n

Pr\u00edspevok #1<\/a><\/noindex> Hovor\u00edte Ceph... je naozaj tak\u00fd dobr\u00fd?
\nPr\u00edspevok #2<\/a><\/noindex> Ceph. Anatomia katastrofy
\n
Zdroj: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u0441\u0432\u044f\u0437\u0438 \u0441 \u043d\u0430\u0431\u0438\u0440\u0430\u044e\u0449\u0435\u0439 \u043f\u043e\u043f\u0443\u043b\u044f\u0440\u043d\u043e\u0441\u0442\u044c\u044e Rook \u0445\u043e\u0447\u0435\u0442\u0441\u044f \u043f\u043e\u0433\u043e\u0432\u043e\u0440\u0438\u0442\u044c \u043e \u0435\u0433\u043e \u043f\u043e\u0434\u0432\u043e\u0434\u043d\u044b\u0445 \u043a\u0430\u043c\u043d\u044f\u0445 \u0438 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430\u0445, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0436\u0434\u0443\u0442 \u0432\u0430\u0441 \u043d\u0430 \u043f\u0443\u0442\u0438. \u041e \u0441\u0435\u0431\u0435: \u041e\u043f\u044b\u0442 \u0430\u0434\u043c\u0438\u043d\u0438\u0441\u0442\u0440\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f ceph \u0441 \u0432\u0435\u0440\u0441\u0438\u0438 hammer, \u043e\u0441\u043d\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u043a\u043e\u043c\u044c\u044e\u043d\u0438\u0442\u0438 t.me\/ceph_ru \u0432 \u0442\u0435\u043b\u0435\u0433\u0440\u0430\u043c. \u0414\u0430\u0431\u044b \u043d\u0435 \u0431\u044b\u0442\u044c \u0433\u043e\u043b\u043e\u0441\u043b\u043e\u0432\u043d\u044b\u043c \u044f \u0431\u0443\u0434\u0443 \u0441\u0441\u044b\u043b\u0430\u0442\u044c\u0441\u044f \u043d\u0430 \u043f\u0440\u0438\u043d\u044f\u0442\u044b\u0435 \u0445\u0430\u0431\u0440\u043e\u043c (\u0441\u0443\u0434\u044f \u043f\u043e \u0440\u0435\u0439\u0442\u0438\u043d\u0433\u0443) \u043f\u043e\u0441\u0442\u044b \u043e \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430\u0445 \u0441 ceph. \u0421 \u0431\u041e\u043b\u044c\u0448\u0435\u0439 \u0447\u0430\u0441\u0442\u044c\u044e \u043f\u0440\u043e\u0431\u043b\u0435\u043c \u0432 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-33803","post","type-post","status-publish","format-standard","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47On v\u00e1m nie je dRook | ProHoster","description":"V s\u00favislosti s narastaj\u00facou popularitou Rook sa chcem porozpr\u00e1va\u0165 o jeho \u00faskaliach a probl\u00e9moch, ktor\u00e9 v\u00e1s \u010dakaj\u00fa na ceste. 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