The honest answer
Entering straight from nothing is hard. Entry-level positions are markedly fewer than in development or testing, and their requirements are higher.
The reason is simple: an operations engineer is responsible for what everyone depends on. A developer's mistake breaks a feature; an infrastructure mistake takes down the whole service. Companies are reluctant to trust that to someone without experience.
That doesn't mean impossible. It means the route is usually longer and more often runs through an adjacent role.
What the job is
Not "configuring servers". Making developers' code reach users quickly, predictably and without manual work.
Concretely: automated builds and releases, environments for development and testing, observing system health, responding to incidents, infrastructure security, and its cost.
A substantial part of the work isn't creative but on-call duty and incident analysis. Worth knowing in advance.
What you need to know
Linux. Not superficially: file system, permissions, processes, services, networking, logs. The foundation; nothing else follows without it.
Networking. How addresses and ports work, name resolution, routing, firewalls, secure connections. Half of operational problems are network problems.
Containers. Packaging applications, running them, linking them. Then orchestration systems, but that's the next level.
Automated build and release. How code becomes a running service without human involvement.
Infrastructure as code. When servers are created from a description rather than by hand.
Observability. Collecting metrics and logs, alerting.
Scripting. Confident shell use plus one language, usually Python.
It's a long list, and that's honest: the barrier here is above average.
Where people usually come from
System administration. The commonest route. Systems and networking knowledge is already there; automation and working with code get added.
Development. Also common. Code understanding is there; infrastructure gets added. Such people usually pick up automation faster.
Technical support. Slower but achievable: it gives you an understanding of how things break in practice.
From nothing. Rarer. Usually via a junior position at a company with someone to teach you.
Building practice without a job
The good news: a portfolio here is easier to assemble than it seems, because you can do all of it yourself.
Rent a small server. Configure its security, deploy an application, attach a domain and a secure connection.
Automate deployment. So that pushing changes updates everything by itself.
Package it in containers and describe running several services together.
Set up observability. Metric collection and an alert when the service is unreachable.
Describe the infrastructure as code. So the whole thing can be recreated from scratch with one command.
That set is already a conversation at interview. It shows not knowledge of words but the ability to reach a working state.
Better still, do it for someone else's project. Find a team building something and take on the infrastructure: deployment, automated builds, monitoring. You get real tasks and a confirmed contribution from people, and the team gets the thing nobody usually has time for.
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