Capacity estimates
Separates active and retained archive storage using explicit decimal-MB assumptions.
Day 045 / DevOps / Capacity
Log Rotation Planner
/ Overview
A dependency-free Python CLI that estimates retained log storage, modeled rotation peak and budget headroom from explicit assumptions.
Rotation and retention settings consume storage together. A small planning tool can make the assumptions and expected headroom visible before an operator chooses settings.
/ Provided servicesClear thinking.
Clear thinking.
Practical delivery.
Retention visibility
Reports the effective archive days after rounding to whole rotation intervals.
Budget review
Compares the modeled peak against a budget and emits an exit code for review.
/ Solution
Log Rotation Planner combines assumed constant daily growth, whole-day rotation intervals, requested archive retention and a compression ratio. It rounds archive count up, reports effective retention, adds active storage and one extra raw interval for a modeled peak, then compares that peak with a supplied budget. It does not read logs or change services, and actual bursts, overhead or rotation behavior may exceed the estimate.
/ Impact
Whole-interval archive count
Effective retention reporting
Archive-only compression model
Steady and modeled peak storage
Budget headroom and status
Finite-number and bounded input validation
Text and JSON output
Ten standard-library tests
Python standard library
Argparse, math and JSON provide the complete dependency-free CLI.
Explicit model
Constant growth, archive compression and a raw rotation-overlap allowance are documented assumptions rather than measured guarantees.
Unittest
Ten tests cover arithmetic, rounding, compression, budget boundaries, invalid numbers and CLI JSON output.