Tech-driven services have raised the demand for systems that will not give out under any circumstance. The problem with systems is that even the well-designed ones can go haywire without warning. Traffic surges, disruption to cloud services, and other unforeseen scenarios can take them out suddenly, sending developers into a panic. 

Enter Site Reliability Engineering (SRE), a specialized discipline focused on ensuring that systems operate efficiently and reliably. With an SRE team at your disposal, your development team can rest easy knowing that potential issues will be handled swiftly and effectively. Instead of firefighting, developers can focus on building new features and improving the user experience.

Let's go through some frequently asked questions about SRE to understand what it is all about. In a subsequent post, we will discuss a specific case study.

1. What is the difference between DevOps and SRE?

Both DevOps and SRE focus on automation and collaboration. This similarity not withstanding, there are important differences between the two. DevOps is a cultural movement that emphasizes collaboration and communication in software development and IT operations. It aims to improve the speed and quality of software delivery by bringing development and operations teams together.

SRE is a role within the broader DevOps cultural framework that is tasked with ensuring the availability, scalability, and performance of software systems in production. Site reliability engineers work closely with development teams to prevent issues from occurring.

2. How does SRE fit into the overall DevOps process?

Site reliability engineers work closely with developers to help improve the overall quality of software systems and reduce the risk of service disruptions. They ensure that software systems can handle increasing amounts of traffic and usage, which is another important aspect of DevOps. By working closely with the development team, site reliability engineers can help identify and address potential performance and scalability issues before they turn critical. They use a variety of tools to achieve this, including monitoring and alerting systems, automation tools, configuration management tools, and various scripting languages.

3. What are some of the key principles of SRE?

  • Automation: Automation is used to deploy software, monitor systems, and perform other project-specific tasks. It reduces the risk of human error and improves the efficiency and speed of software delivery. 
  • Continuous improvement: Data-driven approaches are used to identify and resolve issues, and changes are continually made to processes and tools to avert issues.
  • Collaboration: SRE teams share their knowledge with development teams and take a collective approach to problem-solving.
  • Data-driven decision-making: SRE teams use metrics to identify and resolve issues as well as to measure the performance and scalability of software systems. Some of the key metrics include response time, error rates, throughput, latency, availability, and resource utilization. By closely monitoring these metrics and setting appropriate thresholds, they can quickly detect anomalies and proactively address issues before they impact end users. Additionally, SRE teams may also track business metrics such as revenue and customer satisfaction to ensure that systems are meeting the needs of organizations and their customers.

4. Do site reliability engineers have to know how to code?

Site reliability engineers' coding skills are called upon in many instances, which makes coding an essential skill for someone to succeed in this role. They would need to review code, gain insights on application performance, and take proactive steps to prevent system failure. 

Here are a few instances where a site reliability engineer is required to apply their coding skills:

  • Create automation scripts to set up the monitoring and alerting system and test performance under load.
  • Build CI/CD pipelines to automate the build and release processes. 
  • Review code for issues before it is deployed to production.
  • Monitor the code in production to understand how it is performing in real-world conditions.  

5. Can you provide a real-world example of SRE?

Let's take the case of an e-commerce platform whose page load time has suddenly gone down. This is a critical issue as it can impact customer satisfaction and sales.

When performance falls below a certain threshold, the SRE team receives notifications from the monitoring tools. They might also be made aware of the slow page load issue via customer feedback or sales analytics.

The SRE team will take a series of steps to address the problem:

  1. Analyze the root cause: The team will undertake a root-cause analysis to determine the cause of the slow page load time. This may require:
    • Log analysis: Logs from the e-commerce platform are analyzed to measure platform performance.
    • Performance profiling: Profiling tools are used to identify the source of the problem.
    • Network tracing: Network tracing tools are used to track the flow of data between components and identify bottlenecks.
  1. Fix the root cause: Once the source is identified, the problem is addressed on a war footing. The SRE team might use automated fixes (such as a script in the case of a software bug) to resolve the issue. There could be scenarios where a proper fix would take more time and effort. In those cases, the team will identify a temporary workaround, if any, to put out the fire. A proper fix will be planned on priority and a hot-fix deployment plan will be created.
  1. Review response: When the issue is fixed, the SRE team will conduct a post-incident review to assess the effectiveness of their response and identify opportunities for improvement. The team might, for example, suggest changes to the code to prevent similar issues from occurring in the future. 

Thus the SRE team contributes to the performance, customer experience, and sales.

6. How does SRE generate business value?

Site reliability engineering minimizes or eliminates several risks, keeps the system running smoothly, and contributes to the business’s bottom line:

  • System reliability and availability are improved, leading to happier customers and better sales.
  • System outages and downtime are reduced, improving productivity and minimizing costs.
  • Resources are more efficiently utilized, leading to lower infrastructure costs and increased profitability.
  • System performance is ensured, enabling businesses to better handle high traffic volumes and peak demand periods.
  • Agility and innovation get a boost as the development team can focus on developing new features and functionalities instead of dealing with system issues.
  • Better risk management is achieved as potential issues are identified and addressed proactively, reducing the likelihood of a major failure.
  • Communication and collaboration between teams are enhanced as SRE practices encourage cross-functional cooperation and knowledge-sharing.


Site Reliability Engineering is an important discipline that focuses on ensuring the reliability and performance of software systems in production. By adopting SRE practices, organizations can benefit from improved reliability, increased efficiency and speed of software delivery, better collaboration, increased scalability, and reduced risk. In the next part of this blog post, we will discuss a real-world example of SRE and how it improved the stability of an application in a production environment. 

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Director, Projects
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Senior Architect