{"id":55700,"date":"2020-01-26T00:00:00","date_gmt":"2020-01-25T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/trassirovka-i-monitoring-v-istio-mikroservisy-i-printsip-neopredelennosti"},"modified":"2020-02-18T14:03:50","modified_gmt":"2020-02-18T11:03:50","slug":"trassirovka-i-monitoring-v-istio-mikroservisy-i-printsip-neopredelennosti","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sq\/blog\/administrirovanie\/trassirovka-i-monitoring-v-istio-mikroservisy-i-printsip-neopredelennosti","title":{"rendered":"Gjeografikimi dhe monitorimi n\u00eb Istio: mikrosh\u00ebrbimet dhe parimi i pasiguris\u00eb","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Principi i paqart\u00ebsis\u00eb i Heisenbergut thot\u00eb se nuk \u00ebsht\u00eb e mundur t\u00eb matin ngjash\u00ebm pozita dhe shpejt\u00ebsin\u00eb e nj\u00eb objekti. N\u00ebse objekti \u00ebsht\u00eb n\u00eb l\u00ebvizje, at\u00ebher\u00eb ai nuk ka nj\u00eb vendndodhje t\u00eb sakt\u00eb. Nd\u00ebrsa, n\u00ebse ka nj\u00eb vendndodhje, at\u00ebher\u00eb nuk ka shpejt\u00ebsi.<\/p>\n

\"Gjeografikimi
\n
\nSa i p\u00ebrket mikrosh\u00ebrbimeve mbi platform\u00ebn Red Hat OpenShift (n\u00ebn menaxhimin e Kubernetes), p\u00ebrmes softuerit p\u00ebrkat\u00ebs me burim t\u00eb hapur, ato mund t\u00eb raportojn\u00eb nj\u00ebkoh\u00ebsisht p\u00ebr performanc\u00ebn dhe gjendjen e tyre. Kjo nuk e mohon teorin\u00eb e Heisenbergut, por ndihmon n\u00eb eleminimin e paqart\u00ebsis\u00eb gjat\u00eb pun\u00ebs me aplikacionet cloud. Istio lejon organizimin e leht\u00eb t\u00eb gjurmimit dhe monitorimit t\u00eb k\u00ebtyre aplikacioneve, p\u00ebr t\u00eb mbajtur gjith\u00e7ka n\u00ebn kontroll.
\n<\/a><\/noindex><\/p>\n

P\u00ebrcaktojm\u00eb terminologjin\u00eb<\/h3>\n

\nN\u00ebn gjurmimit<\/b> (Tracing) ne kuptojm\u00eb si regjistrimin e aktivitetit t\u00eb sistemit. Kjo ting\u00ebllon mjaft e p\u00ebrgjithshme, por n\u00eb t\u00eb v\u00ebrtet\u00eb nj\u00eb nga rregullat kryesore k\u00ebtu \u00ebsht\u00eb q\u00eb t\u00eb d\u00ebrgosh t\u00eb dh\u00ebnat e gjurmimit n\u00eb nj\u00eb depo t\u00eb p\u00ebrshtatshme, pa u shqet\u00ebsuar p\u00ebr formatimin e tyre. T\u00eb gjitha pun\u00ebt p\u00ebr gjetjen dhe analizimin e t\u00eb dh\u00ebnave jan\u00eb ngarkuar te p\u00ebrdoruesi i tyre. N\u00eb Istio p\u00ebrdoret sistemi i gjurmimit Jaeger, i cili realizon modelin e t\u00eb dh\u00ebnave OpenTracing.<\/p>\n

Gjurm\u00ebt<\/b> (Traces, dhe fjala \"gjurm\u00ebt\" p\u00ebrdoret k\u00ebtu n\u00eb kuptimin e \"shenjave\", si p\u00ebr shembull n\u00eb ekspertiz\u00ebn ballistike) ne do t'i referohemi t\u00eb dh\u00ebnave q\u00eb p\u00ebrshkruajn\u00eb plot\u00ebsisht kalimin e nj\u00eb k\u00ebrkese ose nj\u00ebsi pune, si\u00e7 thot\u00eb shprehja \"nga fillimi deri n\u00eb fund\". P\u00ebr shembull, \u00e7do gj\u00eb q\u00eb ndodh nga momenti kur p\u00ebrdoruesi klikon nj\u00eb buton n\u00eb nj\u00eb faqe interneti dhe deri n\u00eb momentin e kthimit t\u00eb t\u00eb dh\u00ebnave, duke p\u00ebrfshir\u00eb t\u00eb gjith\u00eb mikrosh\u00ebrbimet e angazhuara n\u00eb k\u00ebt\u00eb proces. Mund t\u00eb themi se nj\u00eb gjurm\u00eb p\u00ebrshkruan plot\u00ebsisht (ose modelon) kalimin e k\u00ebrkes\u00ebs p\u00ebrpara dhe prapa. N\u00eb nd\u00ebrfaqen Jaeger, gjurm\u00ebt shfaqen t\u00eb organizuara n\u00eb p\u00ebrb\u00ebr\u00ebs n\u00eb boshtin temporal, ashtu si nj\u00eb zinxhir mund t\u00eb shp\u00ebrndahen n\u00eb lidhjet e tij t\u00eb ve\u00e7anta. Vet\u00ebm q\u00eb n\u00eb vend t\u00eb lidhjeve, gjurma p\u00ebrb\u00ebhet nga t\u00eb ashtuquajturat span.<\/p>\n

Span<\/b> \u2013 \u00ebsht\u00eb intervali nga fillimi i realizimit t\u00eb nj\u00eb nj\u00ebsie pune deri n\u00eb p\u00ebrfundimin e saj. Duke vazhduar analogjin\u00eb, mund t\u00eb themi se \u00e7do span p\u00ebrfaq\u00ebson nj\u00eb lidhje t\u00eb ve\u00e7ant\u00eb n\u00eb zinxhir. Span mund t\u00eb ket\u00eb (ose jo) nj\u00eb ose m\u00eb shum\u00eb span t\u00eb f\u00ebmij\u00ebve. Si pasoj\u00eb, span-i m\u00eb i lart\u00eb (root span) do t\u00eb ket\u00eb t\u00eb nj\u00ebjt\u00ebn p\u00ebrmbledhje kohore si gjurma q\u00eb i referohet.<\/p>\n

Monitorimi<\/b> \u2013 \u00ebsht\u00eb, n\u00eb t\u00eb v\u00ebrtet\u00eb, vet\u00eb v\u00ebzhgimi i sistemit tuaj \u2013 me syt\u00eb, p\u00ebrmes UI ose mjeteve t\u00eb automatizimit. Monitorimi bazohet n\u00eb t\u00eb dh\u00ebnat e gjurmimit. N\u00eb Istio, monitorimi realizohet me ndihm\u00ebn e Prometheus dhe ka UI p\u00ebrkat\u00ebs. Prometheus mb\u00ebshtet monitorimin automatike duke p\u00ebrdorur njoftime Alerts dhe Alert Managers.<\/p>\n

L\u00ebm\u00eb shenjat<\/h3>\n

\nQ\u00eb gjurmimi t\u00eb b\u00ebhet i mundur, aplikacioni duhet t\u00eb krijoj\u00eb nj\u00eb koleksion span. Pastaj ato duhet t\u00eb eksportohen n\u00eb Jaeger, n\u00eb m\u00ebnyr\u00eb q\u00eb ai t\u00eb krijoj\u00eb nj\u00eb paraqitje vizuale t\u00eb gjurmimit. Nd\u00ebr t\u00eb tjera, k\u00ebto span sh\u00ebnojn\u00eb emrin e operacionit, si dhe shenjat e koh\u00ebs s\u00eb nisjes dhe p\u00ebrfundimit t\u00eb tij. Transferimi i span b\u00ebhet duke ridrejtuar titujt e HTTP k\u00ebrkesave t\u00eb destinuara p\u00ebr Jaeger nga k\u00ebrkesat hyr\u00ebse n\u00eb ato dal\u00ebse. N\u00eb var\u00ebsi t\u00eb gjuh\u00ebs s\u00eb programimit t\u00eb p\u00ebrdorur, p\u00ebr k\u00ebt\u00eb mund t\u00eb k\u00ebrkohet nj\u00eb modifikim i vog\u00ebl i kodit burimor t\u00eb aplikacioneve. M\u00eb posht\u00eb \u00ebsht\u00eb nj\u00eb shembull kodi n\u00eb Java (duke p\u00ebrdorur framework-un Spring Boot), i cili shton titujt B3 (Zipkin-style) n\u00eb k\u00ebrkes\u00ebn tuaj n\u00eb klas\u00ebn konfiguruese t\u00eb Spring:<\/p>\n

\"Gjeografikimi
\nK\u00ebtu p\u00ebrdoren cil\u00ebsimet e m\u00ebposhtme t\u00eb titujve:<\/p>\n

\"Gjeografikimi
\nN\u00ebse po p\u00ebrdorni Java, at\u00ebher\u00eb kodi mund t\u00eb mos prek\u00ebt, vet\u00ebm shtoni disa rreshta n\u00eb skedarin POM t\u00eb Maven dhe caktoni variablat e ambientit. Ja cilat rreshta duhet t\u00eb shtoni n\u00eb skedarin POM.XML p\u00ebr t\u00eb vendosur Jaeger Tracer Resolver:<\/p>\n

\"Gjeografikimi
\nDhe variablat p\u00ebrkat\u00ebs t\u00eb ambientit caktohen n\u00eb Dockerfile:<\/p>\n

\"Gjeografikimi
\nTani, gjith\u00e7ka \u00ebsht\u00eb e konfiguruar, dhe mikrosh\u00ebrbimet tona do t\u00eb fillojn\u00eb t\u00eb japin t\u00eb dh\u00ebna gjurmimi.<\/p>\n

Shikojm\u00eb nga nj\u00eb k\u00ebndv\u00ebshtrim i p\u00ebrgjithsh\u00ebm<\/h3>\n

\nIstio p\u00ebrmban nj\u00eb panel t\u00eb thjesht\u00eb kontrolli t\u00eb bazuar n\u00eb Grafana. Kur gjith\u00e7ka \u00ebsht\u00eb e konfiguruar dhe punon mbi platform\u00ebn Red Hat OpenShift PaaS (n\u00eb shembullin ton\u00eb, Red Hat OpenShift dhe Kubernetes jan\u00eb vendosur n\u00eb minishift), ky panel aktivizohet me komand\u00ebn e m\u00ebposhtme:<\/p>\n

open "$(minishift openshift service grafana -u)\/d\/1\/istio-dashboard?refresh=5⩝Id=1"\n<\/code><\/pre>\n
\nPaneli Grafana lejon nj\u00eb vler\u00ebsim t\u00eb shpejt\u00eb t\u00eb funksionimit t\u00eb sistemit. Nj\u00eb fragment i k\u00ebtij paneli \u00ebsht\u00eb treguar n\u00eb figur\u00ebn m\u00eb posht\u00eb:<\/p>\n
\"Gjeografikimi
\nK\u00ebtu shihet se mikros\u00ebrvici customer th\u00ebrret mikros\u00ebrvicin preference v1, i cili nga ana e tij th\u00ebrret mikros\u00ebrvicet recommendation v1 dhe v2. N\u00eb panelin Grafana, ka nj\u00eb bllok Dashboard Row p\u00ebr metrikat e nivelit t\u00eb lart\u00eb, si\u00e7 jan\u00eb numri i p\u00ebrgjithsh\u00ebm i k\u00ebrkesave (Global Request Volume), p\u00ebrqindja e k\u00ebrkesave t\u00eb suksesshme (success rates), dhe gabimet 4xx. P\u00ebrve\u00e7 k\u00ebsaj, aty ka nj\u00eb paraqitje t\u00eb Server Mesh me grafik\u00eb p\u00ebr \u00e7do sh\u00ebrbim dhe nj\u00eb bllok Services Row p\u00ebr shikimin e detajeve t\u00eb plota p\u00ebr \u00e7do kontejner p\u00ebr secilin sh\u00ebrbim.<\/p>\n
Tani le t\u00eb thellohemi m\u00eb thell\u00eb<\/h3>\n
\nMe nj\u00eb gjurmim t\u00eb konfiguruar si\u00e7 duhet t\u00eb Istio, i cili, si\u00e7 quhet, vjen direkt nga kutia, lejon t\u00eb thellohemi n\u00eb analiz\u00ebn e performanc\u00ebs s\u00eb sistemit. N\u00eb UI-n\u00eb e Jaeger-it, mund t\u00eb shikoni gjurmimet dhe t\u00eb shihni se sa larg dhe thell\u00eb shkojn\u00eb ato, si dhe t\u00eb lokalizoni vizualisht ngushticat n\u00eb performanc\u00eb. Kur p\u00ebrdorni Red Hat OpenShift n\u00eb platform\u00ebn minishift, nisja e UI-s\u00eb s\u00eb Jaeger b\u00ebhet me komand\u00ebn n\u00eb vijim:<\/p>\n
minishift openshift service jaeger-query --in-browser\n<\/code><\/pre>\n
\n\"Gjeografikimi
\n\u00c7far\u00eb mund t\u00eb thuhet p\u00ebr gjurmimin n\u00eb k\u00ebt\u00eb screenshot:<\/p>\n