Fleet management
Fleet management is the practice of inventorying, provisioning, monitoring, patching, and securing a group of servers — cloud instances and on-premise or bare-metal machines alike — as one managed set, using consistent tooling, policy, and an audit trail instead of handling each machine individually by hand.
The term comes from traditional IT operations, where a "fleet" meant every physical server a team was responsible for — racked in a data center, in a colocation cage, or sitting under a desk. Fleet management covers the full lifecycle of that group: discovering what exists, provisioning new capacity, keeping operating systems and software patched, watching for failures or drift, enforcing consistent configuration and access policy, and eventually decommissioning hardware that's no longer needed. Cloud computing didn't replace this discipline, it multiplied it. A single organisation might now run instances across several providers, each with its own console, API, and terminology, alongside physical machines that still need the same patching and monitoring discipline they always did. "Fleet" today spans both worlds at once.
In practice, fleet management is hard because visibility fragments faster than headcount grows. Each cloud provider ships its own dashboard and command-line tool; bare-metal servers are managed through yet another set of scripts, configuration management tools, or manual SSH sessions. A team can end up needing five or six different skill sets just to know what's running, let alone whether it's patched, correctly configured, or within budget. Security and compliance make the stakes higher: a regulator or auditor asking "who changed this firewall rule, and when" shouldn't require reconstructing the answer from shell history and chat messages across several tools. Frameworks like the EU's NIS2 directive expect organisations to demonstrate exactly that kind of traceability for the infrastructure their services run on. Cost is the other blind spot — usage and spend split across providers rarely gets rolled up until the invoices arrive.
Modern fleet management tools typically work through two mechanisms. A control plane talks to each cloud provider's API to discover, provision, and adjust resources without needing anything installed on the machine itself. Alongside that, a lightweight agent runs on servers themselves (cloud or bare metal) to handle what an external API can't see: local monitoring, patch status, installed software, and runbook automation for incident response, so the same remediation steps run identically whether the box sits in a hyperscaler region or a rack in an office closet. Kubernetes clusters usually need a separate, cluster-aware agent for in-cluster inventory. Done well, the distinction between "cloud fleet" and "on-premise fleet" stops being an organisational or tooling boundary and becomes just a property of where a given machine happens to run.
Why fleet management matters
Fleet management determines how fast your team can answer basic operational questions: what's running, is it patched, is it configured correctly, and who touched it last. Without it, those answers live in tribal knowledge — whoever set up a given server remembers its quirks, and nobody else does. That's a business risk as much as a technical one: incident response slows down when responders have to rediscover an environment before they can fix it, security reviews stall waiting for an inventory that doesn't exist, and compliance audits (GDPR, NIS2, sector-specific frameworks) require exactly the change history that ad hoc management never captured. As infrastructure spreads across more providers and more physical locations, the cost of not having consistent fleet management compounds — each new server or account adds another blind spot rather than another entry in a shared inventory.
How Sencai helps
Sencai gives your team one control plane for both senses of fleet: cloud instances across eleven providers, from Hetzner to AWS, and physical or bare-metal servers, reached by a lightweight agent installed on the machine. Connect an existing cloud account and Sencai inventories what's already running immediately, with no migration required; from there, you provision, resize, or destroy resources the same way regardless of provider. The same agent handles monitoring, patching, software inventory, and approval-gated runbooks on any Linux server, cloud or on-premise, so an incident response step written once runs the same way everywhere. Every action, across both, writes to a single tamper-evident audit log, and cost is visible across all connected providers in one place.
See hybrid and on-premise fleet management →