April 2025
Intermediate to advanced
200 pages
5h 57m
Portuguese (Portugal, Brazil)
Content preview from Segurança de contentores
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Capítulo 4. Isolamento de contentores
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Este é o capítulo em que vais descobrir como os containers realmente funcionam! Isso será essencial para entender até que ponto os containers são isolados uns dos outros e do host. Serás capaz de avaliar por ti próprio a força da fronteira de segurança que rodeia um contentor.
Como sabes, se alguma vez correste docker exec <image> bash, um contentor parece-se muito com uma máquina virtual por dentro. Se tiveres acesso à shell de um contentor e executares ps, podes ver apenas os processos que estão a correr dentro dele. O contentor tem a sua própria pilha de rede e parece ter o seu próprio sistema de ficheiros com um diretório raiz que não tem qualquer relação com a raiz no hospedeiro. Podes executar contentores com recursos limitados, tais como uma quantidade restrita de memória ou uma fração das CPUs disponíveis. Tudo isso acontece usando os recursos do Linux que vamos aprofundar neste capítulo.
Por mais que se assemelhem superficialmente, é importante perceber que os containers não são máquinas virtuais e, no Capítulo 5, veremos as diferenças entre esses dois tipos de isolamento. Na minha experiência, entender realmente e ser capaz de contrastar os dois é absolutamente fundamental para entender até que ponto as medidas de segurança tradicionais podem ser eficazes em contêineres e para identificar onde ferramentas específicas ...
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