Discussion
Match each Linux mechanism with what it provides for containers.
List I
A. Namespaces
B. Control groups
C. Union filesystems
D. Capabilities
List II
1. layered images sharing common base layers
2. isolation of what a process can see
3. fine grained restriction of privileged operations
4. limits on what resources it may use
Answer: C
The container is an assembly of ordinary kernel features rather than a distinct object. Knowing which feature does what is essential when isolation has to be reasoned about. None of them is new. The container is an assembly of old parts.
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