Start many short-lived workloads quickly when they can use the same Linux kernel.
Why do containers generally start more easily than VMs?
Containers usually start isolated processes without booting a guest kernel, so their startup overhead is lower than a full VM.
Detailed explanation
Incorrect. Containers still consume CPU while their processes run.
Incorrect. Containers still consume CPU while their processes run.
Correct. They normally avoid a separate guest-kernel boot and start isolated processes.
Correct. They normally avoid a separate guest-kernel boot and start isolated processes.
Incorrect. Containers use memory for their processes and filesystem layers.
Incorrect. Containers use memory for their processes and filesystem layers.
Incorrect. Images contain user-space filesystem content.
Incorrect. Images contain user-space filesystem content.
Try it yourself
An example you can run in a temporary verification environment.
test -e /proc/self/ns/mnt && echo namespace-supportedExpected result
namespace-supportedKey points
- Startup overhead
- Host kernel
- Isolated process
Notes
- Environment: Linux namespace対応kernel
- Command output formatting can vary slightly by distribution or tool version.
- Run the example in a temporary directory or process when possible.
Foundation review
Read the scope first
Check whether the command acts on the current shell, a new process, an existing process, or a file.
Verify the observable result
Use the supplied command and compare the output with the expected result.