You want to configure Docker daemon to use the journald logging driver by default and limit log file size to 5 MB with 2 rotated files. Which daemon.json configuration is correct?

hard📝 Best Practice Q15 of 15

Docker - Logging and Monitoring

A{ "log-driver": "journald", "log-opts": { "max-size": "5m", "max-file": "2" } }

B{ "logging-driver": "journald", "logging-opts": { "max-size": "5m", "max-file": "2" } }

C{ "log-driver": "journald", "log-opts": { "max-size": 5, "max-file": 2 } }

D{ "log-driver": "journald", "log-opts": { "max-size": "5MB", "max-file": "2" } }

Step-by-Step Solution

Solution:

Step 1: Identify correct keys in daemon.json
The keys are "log-driver" and "log-opts" (not "logging-driver" or "logging-opts").
Step 2: Check value formats for options
max-size must be a string with units like "5m" (not number or "5MB" which is invalid).
Final Answer:
{ "log-driver": "journald", "log-opts": { "max-size": "5m", "max-file": "2" } } -> Option A
Quick Check:
Use "log-driver" and string values with units [OK]

Quick Trick: Use "log-driver" and string sizes like "5m" in daemon.json [OK]

Common Mistakes:

Using wrong keys like logging-driver
Using numeric values without units
Using invalid units like MB instead of m

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You want to configure Docker daemon to use the journald logging driver by default and limit log file size to 5 MB with 2 rotated files. Which daemon.json configuration is correct?

Step 1: Identify correct keys in daemon.json

Step 2: Check value formats for options

Final Answer:

Quick Check:

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