{"id":94812,"date":"2020-09-22T07:42:40","date_gmt":"2020-09-22T05:42:40","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/obzor-vozmozhnostej-kubespray-otlichie-originalnoj-versii-i-nashego-forka"},"modified":"2020-09-22T07:42:40","modified_gmt":"2020-09-22T05:42:40","slug":"obzor-vozmozhnostej-kubespray-otlichie-originalnoj-versii-i-nashego-forka","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/administrirovanie\/obzor-vozmozhnostej-kubespray-otlichie-originalnoj-versii-i-nashego-forka","title":{"rendered":"\u00abPanoramica delle funzionalit\u00e0 di Kubespray\u00bb: Differenza tra la versione originale e il nostro fork","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>23 settembre 20.00 MSK Sergej Bondarev terr\u00e0 un webinar gratuito \"<noindex><a rel=\"nofollow\" href=\"https:\/\/slurm.io\/webinar-kubespray-overview?utm_source=habr&amp;utm_medium=promo&amp;utm_campaign=webinar_kubsprey_23-09-2020&amp;utm_content=post_17-09-2020&amp;utm_term=dzygovbrodskiy\">Panoramica delle funzionalit\u00e0 di Kubespray<\/a><\/noindex>`, in cui spiegher\u00e0 come si prepara kubespray per renderlo veloce, efficiente e resistente ai guasti.<\/p>\n<p><\/p>\n<p>Sergej Bondarev illustrer\u00e0 le differenze tra la versione originale e il nostro fork:<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"\u00abPanoramica delle funzionalit\u00e0 di Kubespray\u00bb: Differenza tra la versione originale e il nostro fork\" src=\"\/wp-content\/uploads\/2020\/09\/f45b10f9a5a7c360906ad58e9e643a08.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>La differenza tra la versione originale e il nostro fork. <\/p>\n<p><\/p>\n<p>Coloro che hanno gi\u00e0 avuto esperienza con kubespray potrebbero ora chiedersi perch\u00e9 io opponga kubeadm a kubespray, dato che kubespray viene utilizzato per creare un cluster e in effetti chiama kubeadm, e a prima vista sembra un semplice script per l'installazione di pacchetti e l'avvio automatizzato.<\/p>\n<p><\/p>\n<p>Ma non \u00e8 sempre stato cos\u00ec; in origine, kubespray installava tutti i componenti autonomamente:<\/p>\n<p><\/p>\n<ul>\n<li>assemblava il cluster etcd;<\/li>\n<li>installava i kubelet, generava certificati, configurazioni e token di accesso per i pod statici del control plane e altri componenti di servizio;<\/li>\n<li>creava account di servizio per i nodi di lavoro e li collegava al cluster.<\/li>\n<\/ul>\n<p><\/p>\n<p>Ma l'anno scorso hanno rimosso questa funzionalit\u00e0, lasciando solo kubeadm, che all'epoca non era molto performante. Mi sono sentito deluso e ho creato il mio fork, nel quale ho mantenuto la modalit\u00e0 classica di installazione, e ora supporto attivamente questo fork, cherry-pickando i commit dal kubespray originale. Nel frattempo, aggiorno la modalit\u00e0 classica con le nuove modifiche.<\/p>\n<p><\/p>\n<p>Pertanto, la differenza tra i cluster creati dal mio fork e quello originale \u00e8 kube-proxy e i tempi di validit\u00e0 dei certificati.<\/p>\n<p><\/p>\n<p>Nel mio fork tutto \u00e8 rimasto come prima: kube-proxy viene eseguito come static pod e i certificati vengono emessi per 100 anni.<\/p>\n<p><\/p>\n<p>In Kubeadm, kube-proxy viene eseguito come daemonset e i certificati vengono emessi per 1 anno, e devono essere rinnovati periodicamente. kubeadm ha finalmente imparato a fare questo con un solo comando.<\/p>\n<p><\/p>\n<p>La differenza \u00e8 piccola, e al momento utilizziamo entrambi i varianti.<\/p>\n<p><\/p>\n<p>Caratteristiche (svantaggi) nell'uso industriale:<\/p>\n<p><\/p>\n<p>Lo scenario \u00e8 universale, quindi non \u00e8 molto veloce. La propria versione pu\u00f2 essere notevolmente accelerata, eliminando i controlli e avviandosi da un'immagine preconfigurata.<\/p>\n<p><\/p>\n<p>Lo scenario \u00e8 complesso, ci sono punti illogici e un pesante retaggio legacy. L'installazione di controller aggiuntivi e software tramite kubespray \u00e8 utile per l'apprendimento e i test. Nell'uso produttivo, dipendere da kubespray non \u00e8 un'idea molto saggia; inoltre, l'aggiornamento del software \u00e8 realizzato con il metodo \"uccidi-e-rifai\" \u2014 il che significa interruzioni nel servizio.<\/p>\n<p><\/p>\n<p>\u00c8 possibile aggiungere solo nodi di lavoro; ci sono alcune complessit\u00e0 con i master riguardo ai certificati e lo scenario non gestisce tutti i possibili problemi che potrebbero sorgere.<\/p>\n<p><\/p>\n<p>Ad esempio, ho avuto un problema con kubeadm quando \u00e8 fallito durante l'aggiunta del secondo e terzo master, e dopo questo kubespray eseguiva kubeadm reset sul nodo, provando ad aggiungere di nuovo il master.<\/p>\n<p><\/p>\n<p>Il problema era che al momento del guasto il secondo istanza di etcd si era gi\u00e0 registrata, e poich\u00e9 veniva anch'essa eliminata dopo il reset, ci ritrovavamo in una situazione difficile: un cluster etcd con due nodi, uno dei quali era stato rimosso e l'altro non accettava pi\u00f9 clienti. Alla fine, il cluster \u00e8 morto prima ancora di nascere.<\/p>\n<p><\/p>\n<p>Opensource com'\u00e8.<\/p>\n<p><\/p>\n<p>Tutto questo e molto altro in un webinar gratuito \"<noindex><a rel=\"nofollow\" href=\"https:\/\/slurm.io\/webinar-kubespray-overview?utm_source=habr&amp;utm_medium=promo&amp;utm_campaign=webinar_kubsprey_23-09-2020&amp;utm_content=post_17-09-2020&amp;utm_term=dzygovbrodskiy\">Panoramica delle funzionalit\u00e0 di Kubespray<\/a><\/noindex>\" il 23 settembre alle 20:00 MSK. <\/p>\n<p><\/p>\n<p>Unisciti a noi!<\/p>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/southbridge\/blog\/519890\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>23 \u0441\u0435\u043d\u0442\u044f\u0431\u0440\u044f 20.00 \u041c\u0421\u041a \u0421\u0435\u0440\u0433\u0435\u0439 \u0411\u043e\u043d\u0434\u0430\u0440\u0435\u0432 \u043f\u0440\u043e\u0432\u0435\u0434\u0451\u0442 \u0431\u0435\u0441\u043f\u043b\u0430\u0442\u043d\u044b\u0439 \u0432\u0435\u0431\u0438\u043d\u0430\u0440 \u00ab\u041e\u0431\u0437\u043e\u0440 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0435\u0439 Kubespray\u00bb, \u0433\u0434\u0435 \u0440\u0430\u0441\u0441\u043a\u0430\u0436\u0435\u0442, \u043a\u0430\u043a \u0433\u043e\u0442\u043e\u0432\u044f\u0442 kubespray, \u0447\u0442\u043e\u0431\u044b \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u043e\u0441\u044c \u0431\u044b\u0441\u0442\u0440\u043e, \u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u043d\u043e \u0438 \u043e\u0442\u043a\u0430\u0437\u043e\u0443\u0441\u0442\u043e\u0439\u0447\u0438\u0432\u043e. \u0421\u0435\u0440\u0433\u0435\u0439 \u0411\u043e\u043d\u0434\u0430\u0440\u0435\u0432 \u0440\u0430\u0441\u0441\u043a\u0430\u0436\u0435\u0442 \u043e\u0442\u043b\u0438\u0447\u0438\u0435 \u043e\u0440\u0438\u0433\u0438\u043d\u0430\u043b\u044c\u043d\u043e\u0439 \u0432\u0435\u0440\u0441\u0438\u0438 \u0438 \u043d\u0430\u0448\u0435\u0433\u043e \u0444\u043e\u0440\u043a\u0430: \u041e\u0442\u043b\u0438\u0447\u0438\u0435 \u043e\u0440\u0438\u0433\u0438\u043d\u0430\u043b\u044c\u043d\u043e\u0439 \u0432\u0435\u0440\u0441\u0438\u0438 \u0438 \u043d\u0430\u0448\u0435\u0433\u043e \u0444\u043e\u0440\u043a\u0430. \u0422\u0435, \u043a\u0442\u043e \u0441 \u043a\u0443\u0431\u0441\u043f\u0440\u0435\u0435\u043c \u0443\u0436\u0435 \u0441\u0442\u0430\u043b\u043a\u0438\u0432\u0430\u043b\u0441\u044f, \u043d\u0430\u0432\u0435\u0440\u043d\u043e\u0435 \u0441\u0435\u0439\u0447\u0430\u0441 \u043d\u0435\u0434\u043e\u0443\u043c\u0435\u0432\u0430\u044e\u0442, \u043f\u043e\u0447\u0435\u043c\u0443 \u044f kubeadm \u043f\u0440\u043e\u0442\u0438\u0432\u043e\u043f\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u044e \u043a\u0443\u0431\u0441\u043f\u0440\u0435\u044e, \u0432\u0435\u0434\u044c \u043a\u0443\u0431\u0441\u043f\u0440\u0435\u0439 \u0434\u043b\u044f [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":94813,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-94812","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"23 \u0441\u0435\u043d\u0442\u044f\u0431\u0440\u044f 20.00 \u041c\u0421\u041a \u0421\u0435\u0440\u0433\u0435\u0439 \u0411\u043e\u043d\u0434\u0430\u0440\u0435\u0432 \u043f\u0440\u043e\u0432\u0435\u0434\u0451\u0442 \u0431\u0435\u0441\u043f\u043b\u0430\u0442\u043d\u044b\u0439 \u0432\u0435\u0431\u0438\u043d\u0430\u0440 \u00ab\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link 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