What is Pod Disruption Budget (PDB)?
A Kubernetes policy defining the minimum available pods during voluntary disruptions.
A PodDisruptionBudget (PDB) limits how many pods of a replicated application can be simultaneously disrupted during voluntary disruptions — node drains, rolling updates, or cluster upgrades. You specify minAvailable (minimum pods that must be up) or maxUnavailable (maximum pods that can be down). PDBs prevent operations from violating availability guarantees. If a node drain would violate the PDB, the drain waits until the PDB constraint can be satisfied.
Deep Dive Guide
kubernetes pdb blocking node drain fix
More Kubernetes Terms
Admission Controller
A Kubernetes plugin that intercepts API requests before objects are persisted.
Auto Scaling
Automatically adjusting the number of compute resources based on demand.
ClusterIP
The default Kubernetes Service type that exposes a service on an internal cluster IP.
ConfigMap
A Kubernetes object for storing non-sensitive configuration data as key-value pairs.
Controller Manager
Kubernetes control plane component running control loops to maintain desired state.
CoreDNS
The default DNS server in Kubernetes clusters for service discovery.
Test your knowledge of Pod Disruption Budget (PDB) and 130 other DevOps concepts