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crafty-penguins / who-we-help / challenges-solutions / legacy-infrastructure
Build & migrate

The old stack still runs. That's the problem.

Aging Linux, leftover hypervisors, distributions past end-of-life, and the one box nobody will touch. We stabilize what you have to keep, replace what you can't keep, and do it without a surprise outage on the thing the business still depends on.

Sounds like "It still works. We just don't want to be the ones who break it."
Legacy Infrastructure
What it looks like

You might recognize one of these.

Legacy infrastructure usually isn't abandoned. It's load-bearing. That's why it stayed this long, and why it's now risky.

The OS is past the security window CentOS 7, old Debian, an Ubuntu LTS that stopped getting patches. Auditors noticed before the team did.
The person who built it is gone No runbook. No spare. A reboot is a prayer.
Hardware or the hypervisor is aging out The vendor is gone, the support contract is theater, or VMware just got expensive in a new way.
You can't take the outage to modernize The app is still busy. The upgrade keeps slipping. The risk keeps compounding.
Why it's hard

You can't treat it like a greenfield.

Legacy work is constrained by whatever is already in production: undocumented dependencies, brittle cutovers, and a business that will not pause.

01

The diagram is a suggestion

Cron, local users, that one NFS share, they all have to come along or the "upgrade" is an outage.

02

Vendors and apps pin you

A certified stack, an old database, a binary that only runs on this kernel. The path has to respect that.

03

Fear delays the work

Everyone knows it's fragile. That's why nobody schedules the change window. Fragility wins by default.

How we approach it

Stabilize. Then move. Don't gamble.

We don't start by ripping. We start by knowing what will break, then we pick the smallest safe path off the old thing.

  1. 01

    Discover what's actually load-bearing

    Hosts, apps, integrations, and the people who still know pieces of it.

  2. 02

    Make it survivable in the short term

    Backups that restore, monitoring, and a way to recover if the old box dies this quarter.

  3. 03

    Design the exit

    In-place upgrade, side-by-side rebuild, or a migration. Rollback designed first.

  4. 04

    Cut over and retire

    Measured window, verification, then shut down the thing you were afraid to touch.

What you walk away with

Less fragile. Still running.

✓
A supported platform Or a clear, dated path onto one.
✓
A restore if the old box dies first So modernization isn't a hostage situation.
✓
A cutover you can schedule With a rollback that isn't folklore.
✓
The old thing, retired Not running "just in case" forever.

We've done this work

All success stories

Adjacent challenges

Often part of the same conversation
Get started

Stuck with something you're afraid to touch?

Tell us what's old, what still depends on it, and what "done" looks like. 30 minutes, no obligation, we'll tell you the safest next move.