{"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\/cs\/blog\/administrirovanie\/on-vam-ne-drook","title":{"rendered":"On v\u00e1m nen\u00ed dRook","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Vzhledem k rostouc\u00ed popularit\u011b Rook bych cht\u011bl mluvit o jeho \u00faskal\u00edch a probl\u00e9mech, kter\u00e9 v\u00e1s na cest\u011b \u010dekaj\u00ed.<\/p>\n

O sob\u011b: Zku\u0161enosti s administrac\u00ed ceph od verze hammer, zakladatel komunity t.me\/ceph_ru<\/a><\/noindex> na Telegramu.<\/p>\n

Abych nebyl bez d\u016fkaz\u016f, budu odkazovat na p\u0159ijat\u00e9 p\u0159\u00edsp\u011bvky na Habr (soud\u011b podle hodnocen\u00ed) o probl\u00e9mech s ceph. S v\u011bt\u0161inou probl\u00e9m\u016f v t\u011bchto p\u0159\u00edsp\u011bvc\u00edch jsem se tak\u00e9 setkal. Odkazy na pou\u017eit\u00fd materi\u00e1l na konci p\u0159\u00edsp\u011bvku.<\/p>\n

V p\u0159\u00edsp\u011bvku o Rook zmi\u0148ujeme ceph nikoli n\u00e1hodou \u2014 Rook je v podstat\u011b ceph zabalen\u00fd do kubernetes, a t\u00edm p\u00e1dem d\u011bd\u00ed v\u0161echny jeho probl\u00e9my. S probl\u00e9my ceph i za\u010dneme.
\n<\/a><\/noindex><\/p>\n

Zjednodu\u0161en\u00ed spr\u00e1vy klastru<\/h3>\n

\nJednou z v\u00fdhod Rook je snadnost spr\u00e1vy ceph p\u0159es kubernetes.<\/p>\n

Nicm\u00e9n\u011b ceph obsahuje v\u00edce ne\u017e 1000 parametr\u016f pro nastaven\u00ed, a z\u00e1rove\u0148 skrze rook m\u016f\u017eeme upravit pouze men\u0161\u00ed \u010d\u00e1st z nich.<\/p>\n

P\u0159\u00edklad na Luminous
\n> ceph daemon mon.a config show | wc -l
\n1401<\/p><\/blockquote>\n

Rook je prezentov\u00e1n jako pohodln\u00fd zp\u016fsob installace a aktualizace ceph<\/b>
\nS instalac\u00ed ceph bez Rook nejsou \u017e\u00e1dn\u00e9 probl\u00e9my \u2014 ansible playbook se nap\u00ed\u0161e za 30 minut, ale s aktualizacemi je probl\u00e9m\u016f spousta. <\/p>\n

Citace z p\u0159\u00edsp\u011bvku Krok<\/i><\/p>\n

P\u0159\u00edklad: nespr\u00e1vn\u00e1 pr\u00e1ce crush tunables po aktualizaci z hummer na jewel<\/p>\n

> ceph osd crush show-tunables
\n{
\n\u2026
\n \"straw_calc_version\": 1,
\n \"allowed_bucket_algs\": 22,
\n \"profile\": \"unknown\",
\n \"optimal_tunables\": 0,
\n\u2026
\n}<\/p><\/blockquote>\n

Ale i mezi minoritn\u00edmi verzemi se mohou vyskytnout probl\u00e9my.<\/p>\n

P\u0159\u00edklad: Aktualizace 12.2.6 vedouc\u00ed k tomu, \u017ee klastr se dostane do stavu health err a podm\u00edn\u011bn\u011b po\u0161kozen\u00e9ho PG
\nceph.com\/releases\/v12-2-8-released<\/a><\/noindex><\/p>\n

Neaktualizovat, \u010dekat a testovat? Ale p\u0159ece pou\u017e\u00edv\u00e1me Rook pr\u00e1v\u011b kv\u016fli pohodl\u00ed aktualizac\u00ed.<\/p>\n

Slo\u017eitost disaster recovery klastru v Rook <\/h3>\n

\nP\u0159\u00edklad: OSD pad\u00e1 a h\u00e1z\u00ed chyby pod sebe. Podez\u0159\u00edv\u00e1te, \u017ee probl\u00e9m je v jednom z parametr\u016f v konfigu, chcete zm\u011bnit konfiguraci pro konkr\u00e9tn\u00ed d\u00e9mon, ale nem\u016f\u017eete, proto\u017ee m\u00e1te kubernetes a DaemonSet.<\/p>\n

Nen\u00ed alternativa. ceph tell osd.Num injectargs nefunguje \u2014 OSD je p\u0159ece dole.<\/p>\n

Slo\u017eitost debugov\u00e1n\u00ed<\/h3>\n

\nPro n\u011bkter\u00e1 nastaven\u00ed a testy v\u00fdkonu je t\u0159eba se p\u0159ipojit p\u0159\u00edmo k socketu d\u00e9monu osd. V p\u0159\u00edpad\u011b Rook je nejprve nutn\u00e9 naj\u00edt pot\u0159ebn\u00fd kontejner, pot\u00e9 se do n\u011bj dostat, zjistit, \u017ee debug tool chyb\u00ed, a velmi se roz\u010d\u00edlit.<\/p>\n

Slo\u017eitost sekven\u010dn\u00edho zved\u00e1n\u00ed OSD<\/h3>\n

\nP\u0159\u00edklad: OSD pad\u00e1 kv\u016fli OOM, za\u010d\u00edn\u00e1 rebalance a pot\u00e9 padaj\u00ed dal\u0161\u00ed.<\/p>\n

\u0158e\u0161en\u00ed: Zvedejte OSD jednu po druh\u00e9, po\u010dkejte, a\u017e se pln\u011b p\u0159ipoj\u00ed ke clustru, a pot\u00e9 zvedn\u011bte dal\u0161\u00ed. (V\u00edce v reportu Ceph. Anatomie katastrofy).<\/p>\n

V p\u0159\u00edpad\u011b baremetal instalace to d\u011bl\u00e1te jednodu\u0161e ru\u010dn\u011b, v p\u0159\u00edpad\u011b Rook a jedn\u00e9 OSD na uzlu nejsou prakticky \u017e\u00e1dn\u00e9 probl\u00e9my. Probl\u00e9my s postupn\u00fdm zved\u00e1n\u00edm nastanou, pokud je OSD > 1 na uzlu. <\/p>\n

Samoz\u0159ejm\u011b, \u017ee jsou \u0159e\u0161iteln\u00e9, ale p\u0159ece jen nasazujeme Rook pro zjednodu\u0161en\u00ed, a p\u0159itom z\u00edsk\u00e1v\u00e1me slo\u017eitost.<\/p>\n

Slo\u017eitost stanoven\u00ed limit\u016f pro ceph d\u00e9mony<\/h3>\n

\nPro baremetal instalaci ceph je pom\u011brn\u011b snadn\u00e9 vypo\u010d\u00edtat pot\u0159ebn\u00e9 zdroje pro cluster \u2014 existuj\u00ed vzorce a v\u00fdzkumy. P\u0159i pou\u017e\u00edv\u00e1n\u00ed slab\u00fdch CPU budete p\u0159esto muset prov\u00e9st \u0159adu test\u016f v\u00fdkonu, zjistit, co je Numa, ale i tak je to jednoduch\u011bj\u0161\u00ed ne\u017e v Rook.<\/p>\n

V p\u0159\u00edpad\u011b Rook vedle limit\u016f pam\u011bti, kter\u00e9 lze vypo\u010d\u00edtat, nast\u00e1v\u00e1 ot\u00e1zka stanoven\u00ed limitu CPU.<\/p>\n

A tady se budete muset potr\u00e1pit s testy v\u00fdkonu. P\u0159i podcen\u011bn\u00ed limit\u016f obdr\u017e\u00edte pomal\u00fd cluster, p\u0159i nastaven\u00ed unlim budete m\u00edt aktivn\u00ed vyu\u017eit\u00ed CPU b\u011bhem rebalance, co\u017e negativn\u011b ovlivn\u00ed va\u0161e aplikace v kubernetes.<\/p>\n

Probl\u00e9my se s\u00ed\u0165ovou interakc\u00ed v1<\/h3>\n

\nPro ceph se doporu\u010duje pou\u017e\u00edt s\u00ed\u0165 2x10Gb. Jednu pro klientsk\u00fd provoz, druhou pro slu\u017eebn\u00ed pot\u0159eby ceph (rebalance). Pokud \u017eijete s ceph na baremetal, lze toto odd\u011blen\u00ed snadno nastavit, pokud \u017eijete s Rook, pak v\u00e1m rozd\u011blen\u00ed mezi s\u00edt\u011bmi zp\u016fsob\u00ed probl\u00e9my, proto\u017ee ne ka\u017ed\u00fd konfigurace clusteru umo\u017e\u0148uje zadat do podu dv\u011b r\u016fzn\u00e9 s\u00edt\u011b.<\/p>\n

Probl\u00e9my se s\u00ed\u0165ovou interakc\u00ed v2<\/h3>\n

\nPokud se vzd\u00e1te d\u011blen\u00ed s\u00edt\u00ed, pak p\u0159i rebalance provoz ceph zapln\u00ed cel\u00e9 spojen\u00ed a va\u0161e aplikace v kubernetes budou zpomalovat nebo zkolabuj\u00ed. Rychlost rebalance ceph lze sn\u00ed\u017eit, ale pak za cenu dlouh\u00e9 rebalancov\u00e1n\u00ed z\u00edsk\u00e1te zv\u00fd\u0161en\u00e9 riziko vypadnut\u00ed druh\u00e9ho uzlu z clusteru kv\u016fli disk\u016fm nebo OOM, a pak u\u017e je zaru\u010den\u00fd read only na cluster.<\/p>\n

Dlouh\u00fd rebalance \u2014 dlouh\u00e9 zpomalen\u00ed aplikac\u00ed<\/h3>\n

\nCit\u00e1t z p\u0159\u00edsp\u011bvku Ceph. Anatomie katastrofy.<\/i><\/p>\n

V\u00fdkon testovac\u00edho clusteru:<\/p>\n

Operace z\u00e1pisu velikosti 4 Kbyte trv\u00e1 1 ms, v\u00fdkon 1000 operac\u00ed\/sekundu v 1 vl\u00e1kn\u011b.<\/p>\n

Operace velikosti 4 Mbyte (velikosti objektu) trv\u00e1 22 ms, v\u00fdkon 45 operac\u00ed\/sekundu.<\/p>\n

Kdy\u017e tedy sel\u017ee jedna z t\u0159\u00ed dom\u00e9n, cluster se n\u011bjakou dobu nach\u00e1z\u00ed ve degraduje stavu, a polovina aktivn\u00edch objekt\u016f se rozpt\u00fdl\u00ed po r\u016fzn\u00fdch verz\u00edch, polovina zapisovac\u00edch operac\u00ed za\u010dne s nucen\u00fdm obnoven\u00edm.<\/p>\n

\u010cas nucen\u00e9ho obnoven\u00ed odhadujeme p\u0159ibli\u017en\u011b \u2014 operace z\u00e1pisu do degraduje objektu.<\/p>\n

Nejprve \u010dteme 4 MB za 22 ms, zapisujeme 22 ms, a pot\u00e9 1 ms zapisujeme 4 KB vlastn\u00edch dat. Celkem tedy 45 ms na jednu z\u00e1pisovou operaci do degraduje objektu na SSD, kdy\u017e m\u00e1me pracovn\u00ed v\u00fdkon 1 ms \u2014 pokles v\u00fdkonu o 45n\u00e1sobek.<\/p>\n

\u010c\u00edm vy\u0161\u0161\u00ed je procento degraduje objekt\u016f, t\u00edm hor\u0161\u00ed je situace.<\/p><\/blockquote>\n

Rychlost rebalance je tedy kriticky d\u016fle\u017eit\u00e1 pro spr\u00e1vnou funkci clusteru.<\/p>\n

Specifick\u00e1 nastaven\u00ed server\u016f pro Ceph<\/h3>\n

\nPro Ceph m\u016f\u017ee b\u00fdt pot\u0159eba specifick\u00e9 lad\u011bn\u00ed hostitele. <\/p>\n

P\u0159\u00edklad: nastaven\u00ed sysctl a stejn\u00e9 JumboFrame, n\u011bkter\u00e1 z t\u011bchto nastaven\u00ed mohou negativn\u011b ovlivnit v\u00e1\u0161 p\u0159enos dat.<\/p>\n

Skute\u010dn\u00e1 pot\u0159eba Rook z\u016fst\u00e1v\u00e1 ot\u00e1zkou<\/h3>\n

\nPokud jste v cloudu, m\u00e1te \u00falo\u017ei\u0161t\u011b od sv\u00e9ho poskytovatele cloudu, co\u017e je mnohem pohodln\u011bj\u0161\u00ed. <\/p>\n

Pokud m\u00e1te sv\u00e9 servery, bude spr\u00e1va Ceph pohodln\u011bj\u0161\u00ed bez Kubernetes. <\/p>\n

Pronaj\u00edm\u00e1te servery v n\u011bjak\u00e9m low-cost hostingu? Pak v\u00e1s \u010dek\u00e1 spousta z\u00e1bavy s\u00edt\u011bmi, jejich latenc\u00ed a propustnost\u00ed, co\u017e zjevn\u011b negativn\u011b ovliv\u0148uje Ceph.<\/p>\n

Celkem:<\/b> Implementace Kubernetes a implementace \u00falo\u017ei\u0161t\u011b jsou r\u016fzn\u00e9 \u00fakoly s r\u016fzn\u00fdmi vstupy a r\u016fzn\u00fdmi mo\u017enostmi \u0159e\u0161en\u00ed \u2014 m\u00edchat je znamen\u00e1 ud\u011blat mo\u017en\u00e1 nebezpe\u010dn\u00fd trade-off ve prosp\u011bch jednoho nebo druh\u00e9ho. Ucelit tato \u0159e\u0161en\u00ed bude velmi obt\u00ed\u017en\u00e9 i v projektov\u00e9 f\u00e1zi, a je tu je\u0161t\u011b obdob\u00ed provozu.<\/p>\n

Seznam pou\u017eit\u00e9 literatury:<\/p>\n

P\u0159\u00edsp\u011bvek \u010d. 1<\/a><\/noindex> A co \u0159\u00edk\u00e1te na Ceph\u2026 je opravdu tak dobr\u00fd?
\nP\u0159\u00edsp\u011bvek \u010d. 2<\/a><\/noindex> Ceph. Anatomie katastrofy
\n
Zdroj: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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