April 2025
Intermediate to advanced
328 pages
9h 3m
Italian
book
Kubernetes: Up and Running, 3a edizione
by Brendan Burns, Joe Beda, Kelsey Hightower, Lachlan Evenson
Content preview from Kubernetes: Up and Running, 3a edizione
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Capitolo 16. Integrazione di soluzioni di storage e Kubernetes
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In molti casi, disaccoppiando lo stato dalle applicazioni e costruendo i microservizi in modo che siano il più possibile stateless, si ottengono sistemi massimamente affidabili e gestibili.
Tuttavia, quasi tutti i sistemi più complessi hanno uno stato da qualche parte, dai record di un database ai frammenti di indice che servono i risultati di un motore di ricerca web. A un certo punto, devi avere dei dati memorizzati da qualche parte.
L'integrazione di questi dati con i container e le soluzioni di orchestrazione dei container è spesso l'aspetto più complicato della costruzione di un sistema distribuito. Questa complessità deriva in gran parte dal fatto che il passaggio ad architetture containerizzate è anche un passaggio verso lo sviluppo di applicazioni disaccoppiate, immutabili e dichiarative. Questi modelli sono relativamente facili da applicare alle applicazioni web stateless, ma anche le soluzioni di storage "cloud native" come Cassandra o MongoDB comportano una sorta di passaggi manuali o imperativi per impostare una soluzione affidabile e replicata.
A titolo di esempio, si consideri l'impostazione di un ReplicaSet in MongoDB, che comporta il deploy del demone Mongo e l'esecuzione di un comando imperativo per identificare il leader e i partecipanti al cluster Mongo. Ovviamente ...
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