April 2025
Intermediate to advanced
200 pages
5h 57m
Portuguese (Portugal, Brazil)
Content preview from Segurança de contentores
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Capítulo 5. Máquinas virtuais
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Os contentores são frequentemente comparados com as máquinas virtuais (VMs), especialmente em termos do isolamento que oferecem. Vamos certificar-nos de que tens uma sólida compreensão de como as VMs funcionam para que possas raciocinar sobre as diferenças entre elas e os contentores. Isto será particularmente útil quando quiseres avaliar os limites de segurança em torno das tuas aplicações quando estas são executadas em contentores ou em diferentes VMs. Quando estiveres a discutir os méritos relativos dos contentores de uma perspetiva de segurança, compreender como eles diferem das VMs pode ser uma ferramenta útil.
Na verdade, essa não é uma distinção em preto e branco. Como verás no Capítulo 8, existem várias ferramentas de sandboxing que fortalecem os limites de isolamento em torno dos containers, tornando-os mais parecidos com VMs. Se quiseres compreender os prós e contras de segurança destas abordagens, é melhor começar com uma compreensão firme da diferença entre uma VM e um contentor "normal".
A diferença fundamental é que uma VM executa uma cópia completa de um sistema operativo, incluindo o seu kernel, enquanto um contentor partilha o kernel da máquina anfitriã. Para entender o que isso significa, precisas de saber algo sobre como as máquinas virtuais são criadas e geridas por um Monitor de Máquina Virtual (VMM). Vamos começar ...
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