Docker - Logging and Monitoring
You want to monitor CPU and memory usage of two specific containers named
webapp and db with a single snapshot. Which command should you run?You want to monitor CPU and memory usage of two specific containers named webapp and db with a single snapshot. Which command should you run?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Understand how to specify multiple containers
Docker stats accepts container names as arguments separated by spaces to monitor multiple containers.Step 2: Use the correct flag placement
The--no-streamflag should come before container names;docker stats --no-stream webapp dbplaces it correctly.Step 3: Evaluate other options
docker stats webapp db --no-stream incorrectly places the flag after container names, causing Docker to interpret--no-streamas a container name and resulting in an error. Options C and D use invalid or unsupported--filtersyntax for this command.Final Answer:
docker stats --no-stream webapp db -> Option AQuick Check:
Multiple containers + --no-stream = docker stats --no-stream webapp db [OK]
Quick Trick: List containers after --no-stream for snapshot [OK]
Common Mistakes:
- Using invalid --filter syntax
- Placing flags after container names incorrectly
- Trying to monitor stopped containers
Master "Logging and Monitoring" in Docker
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