Overview
This lesson covers the core principles that underpin Site Reliability Engineering (SRE). Understanding these principles is essential for building and maintaining reliable systems.
Principles of Reliability Engineering
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Service Level Objectives (SLOs):
- Define the target reliability level for a service.
- Example: "99.9% of requests must succeed within 200ms."
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Error Budgets:
- Allow a certain amount of failure to balance reliability and innovation.
- Example: "We can tolerate 0.1% of errors per month."
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Monitoring and Observability:
- Use metrics, logs, and traces to understand system behavior.
- Tools: Prometheus, Grafana, Datadog.
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Automation:
- Automate repetitive tasks to reduce toil and human error.
- Example: Automated scaling of servers during high traffic.
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Incident Response:
- Have a clear process for detecting, responding to, and learning from incidents.
- Example: Incident runbooks and postmortems.
Why These Principles Matter
- Ensure consistent reliability.
- Improve operational efficiency.
- Foster collaboration between teams.
Example Code
# Example: Monitoring CPU usage with top
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