Docker - Resource Management
You want to monitor CPU and memory usage of a specific container named
webapp and save the output once to a file. Which command should you use?You want to monitor CPU and memory usage of a specific container named webapp and save the output once to a file. Which command should you use?
hard📝 Best Practice Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Choose the correct command and options
To get a one-time snapshot, use--no-stream. To format output with container name, CPU, and memory, use--formatwith a table layout.Step 2: Redirect output to a file
Use shell redirection> usage.txtto save the output to a file namedusage.txt.Final Answer:
docker stats --no-stream --format 'table {{.Name}}\t{{.CPUPerc}}\t{{.MemUsage}}' webapp > usage.txt -> Option DQuick Check:
One-time formatted output saved to file = docker stats --no-stream --format 'table {{.Name}}\t{{.CPUPerc}}\t{{.MemUsage}}' webapp > usage.txt [OK]
Quick Trick: Use --no-stream and --format, redirect output to file [OK]
Common Mistakes:
- Using invalid docker monitor command
- Assuming --output option exists
- Using --stream=false instead of --no-stream
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