Old Iron, New Shell: How to Modernize Legacy Monoliths with Kubernetes Sidecars
“We can’t move that to the cloud, it’s a monolith.” We hear this sentence …

When discussing the shift to Cloud-Native and Kubernetes, we often focus on architecture, providers, and costs. However, the most critical variable in this equation is not the tech stack—it’s your team.
In the mid-sized business sector, experienced administrators often harbor an underlying skepticism towards the cloud. The fear of being replaced by automation or losing control over “their” hardware is real. As an IT decision-maker, it is your task to transform this fear into curiosity and pave the way from the classic admin to the modern Platform Engineer.
The classic administrator in mid-sized companies often spends 70% of their time on reactive tasks: patching, troubleshooting, and manual provisioning. The goal of the transformation is not to eliminate these experts but to free them from repetitive tasks.
The first step in change management is clear communication: Cloud-Native does not mean “less work” but “more valuable work.” A Platform Engineer builds the tracks on which development runs. They automate standard processes to gain time for strategic topics like security hardening, performance optimization, and architecture design.
You can’t throw a team into a Kubernetes cluster overnight and expect them to swim. The learning curve is steep.
The fear of the cloud is often the fear of losing control. In the old world, the admin knew exactly which cable was in which rack. In the Cloud-Native world, we return this security through Infrastructure as Code (IaC) and GitOps. Everything is versioned, documented, and reversible. Errors no longer lead to system downtime but can be corrected at the push of a button.
The path to Platform Engineering is a cultural shift. Away from the “ticket mentality” (Dev writes a ticket to Ops) towards shared responsibility. The IT team becomes the enabler.
At ayedo, we repeatedly experience: Once administrators understand that through Kubernetes they gain power over the scalability and resilience of their systems—without having to get up at night for manual reboots—skepticism turns into enthusiasm.
The transformation to Platform Engineer is a significant enhancement of your employees’ market value and an insurance against the skills shortage for your company. Those who master modern tools remain relevant.
Actively support your team. Give them the freedom to learn and the permission to make mistakes in the new environment. Cloud-Native is a team sport.
Does every admin now have to learn programming? Not necessarily in terms of software development. But an understanding of declarative configurations (YAML) and basic scripting languages is essential. It’s about a “coding mindset,” not a computer science degree.
What happens to the “silo experts”? Silos (storage, network, backup) dissolve in a Cloud-Native platform. The experts bring their expertise into the automated platform. A backup specialist then defines the policies instead of manually securing each volume.
How do we best start? Start with a pilot project and a “lighthouse team.” Let the successes (e.g., faster provisioning of environments) speak for themselves. Nothing convinces skeptics more than working automation.
“We can’t move that to the cloud, it’s a monolith.” We hear this sentence …
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