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Яндекс.Директ: как мы деплоим наши Perl-web-при...
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June 13, 2014
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Яндекс.Директ: как мы деплоим наши Perl-web-приложения
http://event.yapcrussia.org/yr2014/talk/273
Elena Bolshakova
June 13, 2014
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Transcript
ßíäåêñ.Äèðåêò: êàê ìû äåïëîèì íàøè Perl-ïðèëîæåíèÿ Åëåíà Áîëüøàêîâà 2014-06-13
Section 1 Êòî ìû
Ýòî ßíäåêñ
Ýòî ðåêëàìà
Ýòî ðàçìåùåíèå ðåêëàìû â ßíäåêñå Äèðåêò
Section 2 Êàêèå ìû
Öèôðû íåïðåðûâíàÿ ðàçðàáîòêà ñ 2003 ãîäà; 300 KSLOC perl-êîäà; ∼1000
èìåíîâàííûõ åäèíèö ôóíêöèîíàëüíîñòè: ñòðàíèöû web-èíòåðôåéñà; ìåòîäû âíåøíåãî API; ìåòîäû âíóòðåííèõ API; êðîíîâûå ñêðèïòû; èåðàðõèÿ ïîëüçîâàòåëåé (>15 ðîëåé); 30 ìëí. âíåøíèõ çàïðîñîâ ê perl-ïðèëîæåíèÿì / ñóòêè (ìíîãî çàïèñåé è òÿæåëûõ ÷òåíèé); mysql: ∼170 ìëðä. çàïèñåé îáùåíèå ñ äåñÿòêàìè ñìåæíûõ ñåðâèñîâ; ñåé÷àñ ∼40 ðàçðàáîò÷èêîâ, â ò.÷. ∼20 perl-ðàçðàáîò÷èêîâ; 10000 êîììèòîâ / 7 ìåñÿöåâ, â ò.÷. 2500 trunk-êîììèòîâ; ïðîäàêøåí: perl-êîä íà ∼40 ñåðâåðàõ; ∼2 ðåëèçà â íåäåëþ.
Òåõíîëîãèè ubuntu perl server-side javascript python, django mysql mongodb map-reduce
(YT) memcached
Òåõíîëîãèè-2 plack apache nginx starman gearman ubic soap (SOAP::Lite) xmlrpc
(XMLRPC::Lite) jsonrpc (JSON::RPC, JSON::RPC::Simple::Client, JSON::RPC2::Client)
Ñðåäû ðàçðàáîò÷åñêèå, ÒÑ, ïðîäàêøåí: ðàçðàáîò÷åñêèå ñ óïðîùåííîé èíôðàñòðóêòóðîé; ÒÑ
ñ ïîëíîöåííîé, êàê íà ïðîäàêøåíå; ðàçðàáîò÷åñêèå è òåñòîâûå ÁÄ: îáåçëè÷åííûé áåêàï ïðîäàêøåíà ðåãóëÿðíî òåñòèðóåòñÿ áåêàï è âîññòàíîâëåíèå; ðàçíîîáðàçíûå äàííûå äëÿ òåñòèðîâàíèÿ; äîñòóïû ðàçäåëåíû (ïðîäàêøåí îáíîâëÿþò òîëüêî àäìèíû).
Section 3 Ïîðà â ïðîäàêøåí
Óïðàâëåíèå ñåðâåðàìè Ñîáñòâåííàÿ Rex-ïîäîáíàÿ óòèëèòà ïîâåðõ ssh; íà óïðàâëÿåìûõ ìàøèíàõ
íèêàêèõ àãåíòîâ.
Ðåëèçû ïåðâè÷íûé èñòî÷íèê èíôîðìàöèè î ðåëèçàõ òðåêåð: ÷òî è
êàê âûêëàäûâàåì; êàêèå ïðîáëåìû íàéäåíû; ñòàòóñû (ïîäòâåðæäåíèÿ QA, çàêàç÷èêà, RM); êàæäûé ðåëèç òåñòèðóåòñÿ íà ÒÑ; ÷òî òåñòèðîâàòü: èçìåíåíèÿ îò ïðîøëîãî ðåëèçà (svn log); ðåãðåññèîííûå òåñòû; â êàæäîì commit-message ññûëêà íà òèêåò â òðåêåðå (ïðîâåðÿåòñÿ svn hook-îì).
Êîä deb-ïàêåòû, apt Óäîáíî: ðàáîòàåò; óíèâåðñàëüíî; ìíîãî ãîòîâûõ èíñòðóìåíòîâ; çàâèñèìîñòè,
â ò.÷. íåïåðëîâûå. Íåóäîáíî: óñòàíàâëèâàòü íå âåðõíþþ âåðñèþ íåïðîñòî; ïîëíîöåííî îòêàòèòü âñå êàê áûëî íåïðîñòî.
Êîä, ìàëåíüêèå õèòðîñòè mainline releasable; ïàêåòèðóåòñÿ ëèáî òðàíê, ëèáî ðåëèçíûé
áðàí÷ (òðàíê + ÷åððè-ïèê); ïî âåðñèè âñåãäà ïîíÿòíî, êàêàÿ òî÷êà â ðåïîçèòîðèè ïàêåòèðîâàëàñü; îòäåëüíûé êîíòðîëèðóåìûé deb-ðåïîçèòîðèé; æóðíàë: ÷òî âûëîæåíî â êàæäûé ìîìåíò íà ñåðâåðàõ, ïèñüìà îá îáíîâëåíèÿõ; çàâèñèìîñòè óêàçûâàòü ñ >=; ïîòåíöèàëüíî îïàñíûå/ñëîæíîîòêàòûâàåìûå îáíîâëåíèÿ îòäåëüíî îò ïðî÷èõ ðåëèçîâ; çàðàíåå ïðîâåðÿòü ïðèãîäíîñòü çàâèñèìîñòåé ê óñòàíîâêå.
Ìèãðàöèè: èçìåíåíèå ñòðóêòóðû ÁÄ (àëüòåðû) Ôàéëû ìèãðàöèé â /deploy ïèøóòñÿ
è êîììèòÿòñÿ âìåñòå ñ êîäîì; ôîðìàò ñòðîãèé, íî ÷åëîâåêî÷èòàåìûé: 20140613_client_comments.migr { type => 'sql', db => 'main', when => 'before', time_estimate => "20 sec", sql => "alter table clients add column `comment` varchar(140) default ''", } ïðèìåíÿþòñÿ ïîëóàâòîìàòè÷åñêè íà ÒÑ, âðó÷íóþ íà ïðîäàêøåíå;
Ìèãðàöèè: êîíâåðòàöèè äàííûõ 20140614_normalize_geo.migr { type => 'script', when =>
'after', time_estimate => "10 ÷àñîâ", comment => "åñëè óïàäåò -- ìîæíî çàïóñêàòü çàíîâî", script => "normalize_geo.pl", }
Ìèãðàöèè: ïðî÷èå äåéñòâèÿ 20131218_upgrade_nginx.migr { type => 'manual', when =>
'any', time_estimate => "10 min", text => "Âûïîëíèòü íà ñåðâåðàõ ãðóïïû PERL: apt-get install nginx-common=1.4.4-5 nginx=1.4.4-5 \ nginx-full=1.4.4-5 è çàòåì nginx-upgrade ", }
Ìèãðàöèè: æäåò ðåøåíèÿ àâòîìàòè÷åñêè ïðîâåðÿòü ïðèìåíåííîñòü; ïðîñòûå ñêðèïòû çàïóñêàòü áåç
ó÷àñòèÿ ÷åëîâåêà.
Ìèãðàöèè: ìàëåíüêèå õèòðîñòè ãëîáàëüíîãî ïîðÿäêà íåò; ÷åëîâåêîïîíÿòíûå èìåíà ñ ïðèìåðíîé
äàòîé; îáÿçàòåëüíûå ðåâüþ è àïïðóâû; óíèâåðñàëüíûé ôîðìàò äëÿ âñåõ äåéñòâèé, ñîïðîâîæäàþùèõ îáíîâëåíèå êîäà; õåëïåð äëÿ ñîçäàíèÿ øàáëîíà ìèãðàöèè; ïàðñèíã: Safe::reval; ñòðîãàÿ âàëèäàöèÿ; ïðîâåðêà ñèíòàêñèñà sql: DBIx::MyParsePP; âðåìÿ ïðèìåíåíèÿ: äî/ïîñëå âûêëàäêè êîäà/êîãäà óãîäíî; òÿæåëûå ìèãðàöèè; òåêñòîâûå îïèñàíèÿ ìèãðàöèé ïèøóòñÿ âìåñòå ñ changelog-îì â ðåëèçíûé òèêåò; åñëè íàäî êîììåíòàðèè, êàê îòêàòûâàòü.
Ìîíèòîðèíã ñõåìû ÁÄ Ôàéëû â /db_schema .schema.sql, .data.sql ñõåìû
è ñëîâàðíûå äàííûå; .text îïèñàíèå òàáëèö; ñêðèïò äëÿ ñðàâíåíèÿ ÁÄ ñ ôàéëàìè; îò÷åòû î ðàñõîæäåíèè ïðîäàêøåí-áàçû è ñîõðàíåííûõ ñõåì. À åùå SchemaSpy: âèçóàëèçàöèÿ ñâÿçåé â ÁÄ. Æäåò ðåøåíèÿ: ïðîâåðÿòü àêòóàëüíîñòü ñîõðàíåííûõ ñõåì ñðàçó ïîñëå êîììèòà.
Ðåãóëÿðíûå çàïóñêè ñêðèïòîâ Ôàéëû â /etc/cron.d Ãåíåðèðóþòñÿ ïðè ñáîðêå ïàêåòîâ
èç pod + íåìíîãî ïîäãîòîâëåííûõ çàðàíåå
Section 4 Áîíóñ-òðåê
Ïðîâåðêè, êîòîðûå äåëàþò æèçíü ñïîêîéíåå ñèíòàêñèñ è ïîäòâåðæäåííîñòü ìèãðàöèé; îòñóòñòâèå
îòëàäî÷íîé ïå÷àòè â ñêðèïòàõ ìèãðàöèé; ñèíòàêñèñ êðîíòàáîâ (íàïðèìåð: ïðè îòñóòñòâèè ïåðåâîäà ñòðîêè â êîíöå ôàéëà cron èãíîðèðóåò ôàéë); ñîîòâåòñòâèå ñóùåñòâóþùèõ ñêðèïòîâ è çàïèñåé â êðîíòàáàõ; ïðàâèëüíûå ôàéëû â /debian: ãëîáàëüíûå ôàéëû + ôàéëû, îòíîñÿùèåñÿ ê ñóùåñòâóþùèì ïàêåòàì; êîìïèëÿöèÿ âñåãî perl-êîäà; êîìïèëÿöèÿ âñåõ TT-øàáëîíîâ; ñîîòâåòñòâèå èñïîëüçóåìûõ è ñóùåñòâóþùèõ øàáëîíîâ; íà âñåõ ñêðèïòàõ åñòü svn:executable + ïðàâèëüíûé shebang;
Ïðîâåðêè, êîòîðûå äåëàþò æèçíü ñïîêîéíåå îòñóòñòâèå ñëåäîâ íåäîðàçðåøåííûõ êîíôëèêòîâ; mergeinfo
òîëüêî íà êîðíå ïðîåêòà; íå÷åëîâåêî÷èòàåìûå ôàéëû èìåþò ïðàâèëüíûé mime-type; âñå èñõîäíèêè â utf8; ìåòêà NO_PRODUCTION.
Ñïàñèáî! Âîïðîñû? Åëåíà Áîëüøàêîâà,
[email protected]