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id: sla
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title: "SLA(服务等级协议)"
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type: concept
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tags: [sre, reliability, contract]
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last_updated: 2026-04-19
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---
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## Definition
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SLA(Service Level Agreement,服务等级协议)是客户级别的正式协议,定义了服务提供者对客户的承诺。
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## Key Characteristics
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- **具有法律约束力**:违反可能涉及经济赔偿
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- **比 SLO 更宽松**:SLO 是团队内部目标,SLA 是对客户的承诺
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- **基于 SLO**:SLA 通常基于内部 SLO 制定
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## Relationship
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- [[SLA(服务等级协议)]] ← based_on ← [[SLO(服务等级目标)]]
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- [[SLO(服务等级目标)]] ← measures ← [[SLI(服务等级指标)]]
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## Example
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- SLO: 99.9% 可用性(内部目标)
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- SLA: 99.5% 可用性(对客户承诺,更宽松)
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## References
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- [[CTP Topic 41 NFR's and Error Budgets]] — SLI/SLO/SLA 体系详解
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- [[SRE]] — 站点可靠性工程实践
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