AWS - Auto Scaling
Which of the following is a valid cron expression for scheduled scaling in AWS?
Which of the following is a valid cron expression for scheduled scaling in AWS?
easy📝 Configuration Q12 of 15
Step-by-Step Solution
Solution:
Step 1: Review cron expression format in AWS
AWS cron expressions have six fields: minutes, hours, day-of-month, month, day-of-week, year.Step 2: Validate each option
cron(0 12 * * ? *) is valid: minute=0, hour=12, day-of-month=*, month=*, day-of-week=?, year=*. cron(0 0 0 0 ? *) has invalid zero day-of-month and month values. cron(60 24 * * ? *) has invalid 60 minutes and 24 hours. cron(* * * * *) has only five fields, missing year.Final Answer:
cron(0 12 * * ? *) -> Option DQuick Check:
Valid AWS cron = 6 fields, correct ranges [OK]
Quick Trick: AWS cron needs 6 fields with valid ranges [OK]
Common Mistakes:
MISTAKES- Using 5-field cron instead of 6-field
- Setting minutes or hours out of range
- Confusing day-of-week and day-of-month
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