DevOps Flashcards
7 cards from real DevOps practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 DevOps flashcards as text
What is the purpose of a 'blue-green deployment'?
Answer: Maintaining two identical environments to switch traffic with zero downtime
Blue-green deployment keeps two production environments so traffic can switch instantly with minimal downtime.
In Docker, what is the difference between an image and a container?
Answer: An image is a static template; a container is a running instance of it
An image is the immutable blueprint, and a container is a live running instance created from it.
Which metric is part of the DORA 'Four Key Metrics' for DevOps performance?
Answer: Deployment frequency
Deployment frequency is one of the four DORA metrics measuring software delivery performance.
What does 'observability' primarily rely on?
Answer: Logs, metrics, and traces
Observability is built on the three pillars of logs, metrics, and traces to understand system internal state.
In a pipeline, what is a 'gate' or 'approval step' used for?
Answer: Requiring a condition or human sign-off before promoting to the next stage
A gate pauses the pipeline until a condition is met or approval is granted before continuing.
What problem does a 'service mesh' (e.g., Istio) primarily solve?
Answer: Managing service-to-service communication, security, and observability
A service mesh handles inter-service traffic management, security, and observability transparently.
Why is 'secrets management' (e.g., HashiCorp Vault) important in DevOps?
Answer: To securely store and rotate credentials instead of hardcoding them
Secrets management securely stores, controls access to, and rotates sensitive credentials outside of code.