AWS CLI v2 migration. Painful, but doable.
Look, if you’re still clinging to AWS CLI v1 like it’s 2013, wake up. Upgrading AWS CLI from v1 to v2 using the migration tool isn’t optional anymore — AWS keeps pushing v2 as the future, with better performance, JSON handling, and all that jazz. But here’s the kicker: v2 broke stuff. Commands fail. Scripts crumble. Workflows? Toast. And AWS, in their infinite wisdom, waited years to drop this v1-to-v2 Migration Tool. Feels like closing the barn door after the horses bolted — or in AWS terms, after the EC2 instances escaped.
Why Bother with AWS CLI v2?
Speed. That’s the pitch. V2 chews through commands faster, handles massive outputs without choking, and plays nicer with modern pipes. But — and it’s a big but — it changes behaviors. S3 copies tag differently. Binary params go base64 by default. Paging gets stricter. Your bash scripts? They’ll barf.
I remember the SDK v2 rollout. Same song: promises of glory, reality of rewrite hell. This tool? AWS admitting defeat, sort of. It scans your scripts, flags diffs, suggests flags to mimic v1 quirks. Unique insight: it’s less a migration than a v1 emulator. You’re not embracing v2; you’re duct-taping the old ways.
Short version: install Python 3.9+, pip, then pip install awscli-migrate. Standalone, no CLI v1 needed. Unlike their half-baked “Upgrade Debug Mode” (v1.44+ only), this works anywhere.
Does the AWS CLI Migration Tool Actually Work?
Run it interactive: awscli-migrate lint-interactive your_script.sh output_v2.sh. It chews your bash, spits diffs.
Take their example: uploading CloudFormation templates to S3, copying, stacking. Tool flags:
In the preceding finding, the associated breaking change is Improved Amazon S3 handling of file properties and tags for multipart copies. The suggested fix, given in a form similar to a Git diff, is to add the –copy-props none flag to the command.
Nice. Adds --copy-props none. Preserves v1 weirdness.
Another:
Binary parameters are passed as base64-encoded strings by default. The suggested fix, is to add the –cli-binary-format raw-in-base64-out flag.
Even if no binary? Tool’s paranoid — flags anyway. Won’t hurt, but chatty.
Paging issue? [MANUAL REVIEW REQUIRED]. No auto-fix. You n, fix later. Summary: X issues, here’s v2.sh.
It errs safe. Flags potentials. Creates v2 script with flags. Test it. Works? Upgrade CLI.
But. Dense scripts? Nested commands? Tool stumbles. Misses context. You’ll manual-review anyway.
Step-by-step, because AWS blogs bury it.
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Install:
pip install awscli-migrate. -
Lint interactive: As above. Review each. y/n/apply.
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Batch mode:
awscli-migrate lint-batch script.sh— reports only. -
Check AWS guide: Breaking changes list. Cross-reference.
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Upgrade CLI: Brew, MSI, whatever. Test v2 script.
Simple? Sure. For toy scripts. Production? Pray.
Hidden Gotchas in AWS CLI v2
Tool misses dynamos. Embedded JSON? Custom paginators? You’re on your own.
S3 multipart tags — fixed with flag. But what about Glacier? Or Lambda invokes with binaries? Flags pile up: --cli-binary-format, --copy-props, --no-paginate. Your clean v1? Bloated v2 emulator.
Dry humor: AWS v2 is “improved.” Improved for them. You? Flag soup.
Historical parallel: Remember Elastic Beanstalk CLI breaks? Or old EC2 API? AWS loves version bumps that snap legs. This tool? Band-aid on a fracture.
Prediction: Six months, half-forget flags. New service breaks again. Rinse, repeat.
And corporate spin? “Easier transition.” Sure, if “easier” means “less blind stabbing.”
Is AWS CLI v2 Worth the Upgrade Headache?
For newbies? Yes. V2’s snappier, future-proof.
Veterans? Meh. If scripts run, don’t touch. But AWS deprecates v1 eventually — bet on it.
Tool’s free. Python dep only. Try on non-prod first.
Me? I’d stick v1 till forced. Tool’s ok — cautious, helpful — but no silver bullet. Manual work lurks.
Upgrade wisely. Or don’t. Your sanity, your call.
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Frequently Asked Questions
What is the AWS CLI v1-to-v2 Migration Tool?
Standalone Python tool that scans bash scripts for v1-to-v2 breaks, suggests flags to mimic v1, outputs fixed script.
How do I install AWS CLI v1 to v2 migration tool?
Python 3.9+, pip install awscli-migrate. No AWS CLI needed.
Does AWS CLI v2 break existing scripts?
Yes — S3 tags, binaries, paging. Tool flags most; manual for others.
Will this tool fix all my AWS CLI issues?
No. Conservative flags potentials; complex cases need hands-on.
