CDN Migration

CDN Migration

Imagine a city's water supply system. The city is your website, the water is the content/data, and the pipelines are your Content Delivery Network (CDN). Over time, as the city grows and the demand for water increases, there might be a need to upgrade to larger, more efficient pipelines or even to source water from a better reservoir. 

This process of switching to a better pipeline system or a new water source is akin to CDN migration. The goal is to ensure that every corner of the city (every user of your website) gets a consistent and efficient supply of water (content/data) with minimal disruption.

In this article, we'll understand what CDN Migration means, why it's not just another buzzword, and why you should consider it for your business.

What is CDN Migration?

CDN Migration is the process of transitioning your website's assets and functionalities—from one CDN provider to another. This not only includes static content like images, CSS, and JavaScript files but also a range of services such as security features (WAF, Rate Limiting), edge computing capabilities, and more. 

Think of it as moving houses; you're taking your belongings (in this case, your website's data) from one location to another. However, unlike a typical house move, here, you're aiming for better speed, scalability, and security.

CDN Migration means moving your website from one CDN service to another. It's not just about switching where your website's files are stored, but also about setting up security features, managing how web traffic flows, telling the new CDN where your original website is, and making sure everything works right on the new service. It's like moving to a new house and making sure all services and utilities are set up correctly.

These steps ensure a seamless transition, maintaining the user experience while optimizing the CDN strategy. 

It's crucial to note that migration isn't solely for static assets like images, CSS, and JavaScript. Advanced CDNs can also manage dynamic content, streaming media, and API calls. Moreover, depending on your website's needs, you may have to consider various caching strategies, HTTP/2 or HTTP/3 support, and other advanced features that your new CDN might offer.


Why Consider CDN Migration?

Why fix it if it ain't broken, right? But what if you could make it even better? CDN Migration is about optimization and future-proofing your digital assets. 

Here are some compelling reasons:

  • Cost-Efficiency: Different CDN providers have varying pricing models. A migration can save you costs in the long run.
  • Performance Boost: New CDN providers might offer better latency and faster asset delivery, which directly translates to a better user experience.
  • Vendor Lock-In: You don’t want to be tied to a specific provider’s tools and services, limiting flexibility and potentially increasing costs when switching. 
  • Global Reach: If your user base is expanding geographically, a CDN migration can help you switch to a provider with a more extensive network of edge servers. For instance, while many CDNs might offer robust performance globally, they can struggle in regions like Australia or China due to political concerns. 
  • Advanced Features: New CDN providers often come with unique functionalities such as Edge Computing
  • Scalability: As your website grows, your CDN needs to grow with it. Migration can be a strategic move to scale your infrastructure.

Steps to Successfully Execute CDN Migration

Performing a CDN migration can feel like navigating a minefield. But with the right steps, you can migrate your website's assets without causing a ripple in your user experience or performance metrics. 

Below, let's dig deep into the methodical approach you should take for a hassle-free CDN migration.

Step 1: Pre-Migration Analysis

Before making a move, it’s essential to understand not just the performance of your current CDN but also its cost and functionality. 


First and foremost, perform a comprehensive analysis of your current CDN's performance. Examine metrics like latency, cache hit ratio, and edge server effectiveness. 

This data sets the benchmark for what your new CDN provider should at least match or preferably exceed.

Tools You Can Use:

  1. Google PageSpeed Insights
  2. WebPageTest
  3. Catchpoint (gives a detailed analysis of CDN performance based on location and time)
  4. Current CDN's analytics dashboard

Consider A/B testing both the old and new CDNs under identical conditions. This will give you a direct performance comparison and help you make a more informed decision.


Different CDNs have varying pricing structures. They might charge differently based on geographic locations or the type of traffic. 

We need to understand these differences and how they align with your budget and traffic patterns. 


All CDNs don’t offer the same services. If you’re seeking advanced security services, like a top-tier WAF, or capabilities, such as edge computing, it’s important to ensure the new CDN provides these. 

For instance, while a CDN may be efficient in some areas, it might not be the best choice if you’re specifically looking for state-of-the-art WAF functionality. 

Step 2: Choose the New CDN Provider

Based on the analysis, select a new CDN provider that aligns with your website's needs and performance goals. 

Take into account factors like pricing, data center locations, and additional features like real-time analytics and security protocols.

Also, consider how well the new CDN integrates with your existing tech stack. For example, if you're heavily invested in AWS services, Amazon CloudFront might offer better synergy while also possibly locking you into their ecosystem.

Step 3: Migration

Now that we’re done with selecting a provider that aligns with your needs in terms of performance, cost, and required features. It’s time to do the following:

  • - Basic Configurations:
  • Origin Setup: Determine where your CDN will pull content from. This could be your original server or another specified location.
  • Domain Configuration: Set up your domain on the CDN. Typically, CDNs will provide a unique domain that you can use or allow you to configure a custom one.
  • Traffic Management Rules: Establish how the CDN should handle different types of traffic and requests. This can include specifying how to route requests based on geographic location or device type.
  • - Advanced Configurations:
  • Behaviors: Define how the CDN should treat specific types of requests or content. For example, you might want to bypass the cache for certain pages or set up redirects.
  • Cache Management Rules: Specify how long content remains in the CDN cache and under what conditions it gets purged or refreshed.
  • Load Balancers: If your origin has multiple servers or endpoints, configure the load balancer settings within the CDN to ensure efficient distribution of traffic.
  • - Add-On Service Configurations:
  • Web Application Firewall (WAF): Many CDNs offer WAF services to protect your content from malicious attacks. The settings and rules might vary between providers, so it's crucial to configure it correctly for your new CDN.
  • Rate Limiting: Set rules to limit the number of requests a user or IP can make in a specified period. This can prevent abuse and ensure fair usage.
  • - Edge Computing Adjustments:
  • If you utilize edge computing, where computations are done closer to the data source, you'll likely need to rewrite or adjust some of your code to be compatible with your new CDN.

Step 4: Monitor and Optimize

Congratulations, you've successfully migrated to a new CDN! But the work isn't over. Continuously monitor performance metrics to ensure that the new CDN meets or exceeds the benchmarks set during your pre-migration analysis.

Use the analytics dashboard provided by your new CDN to make data-driven optimizations. Consider this the beginning of a new phase. Keep a close eye on KPIs like latency, cache hit ratios, and error rates. Use this data to refine your CDN strategy continually.


Challenges in CDN Migration

Moving to a new CDN is like finding your way through a tricky puzzle. The benefits at the end are great, but there are challenges to face. 

This big change can distract a company for a bit, so it's important to plan well to avoid problems.

Let's dive into some of the challenges you might face during CDN Migration:

1. Downtime Risks

The biggest fear during any migration is downtime. If not executed carefully, your website can become temporarily inaccessible. 

While DNS changes propagate, there's a risk that some users might be directed to the old, non-functional CDN, resulting in poor user experience.

2. Configuration Complexity

The settings on your old CDN might not directly map to those on your new CDN. 

This requires careful planning and configuration to ensure that all features, such as caching policies and security settings, are properly transitioned.

The settings on your old CDN might not have a direct counterpart on your new CDN, making the transition complex.

  1. Edge Computing Migration: If you're using edge computing, migrating the code that runs at the edge servers can be particularly challenging. This isn't just copying and pasting; it often involves rewriting or adapting code to fit the new CDN's environment and capabilities.
  2. WAF Configuration: Transferring Web Application Firewall (WAF) settings is another intricate task. Every CDN has its own way of defining security rules and policies. Moving your WAF configuration means understanding these nuances and ensuring that your website remains secure during and after the transition. This process can be time-consuming, as it involves a careful review and testing of each rule to make sure it works as expected.

In addition to these, other features, like caching policies, traffic management behaviors, and more, need meticulous planning and configuration. Each aspect of your old CDN needs to be understood and correctly mapped to the new one to ensure a seamless migration.

3. Legacy System Complications

If you're migrating from an older CDN, you might face compatibility issues with newer technologies. This adds an extra layer of complexity to the migration process.

Benefits of Successful CDN Migration

Successfully navigating the maze of CDN Migration brings you to a treasure trove of benefits. 

Let's unpack what you stand to gain:

1. Speed and Performance

A new CDN often brings with it superior technology and better global coverage through an extensive network of edge servers. The result is a dramatic increase in your website's speed and performance.

2. Cost Efficiency

A successful migration can mean big savings. Newer CDNs often offer more competitive pricing models and features that can help you optimize your spending.

3. Reduce Vendor Lock-In

By migrating to a new CDN, you can escape the limitations and constraints of your previous provider. This gives you greater flexibility for future changes, ensuring you aren't overly dependent on one vendor. 

It paves the way for more agility in adapting to new technologies or market conditions, and allows you to choose services that best fit your evolving needs.

4. Enhanced Security

Modern CDNs offer robust security features like DDoS protection, Bot Management, and more. Migrating to a newer CDN can be like upgrading your security system, giving you peace of mind.

5. Analytics and Insights

Advanced analytics tools give you a bird's eye view of how your content is performing. 

From user demographics to engagement metrics, you gain actionable insights that can inform future business decisions.

6. Competitive Advantage

In the digital world, every millisecond counts. A faster website means happier customers and happier customers are more likely to convert. It's a simple equation that gives you a significant edge over competitors.

Adding some quantitative metrics can give your points more weight. For example, according to studies, a well-implemented CDN can reduce website latency by up to 50%. These numbers don't just sound good; they translate to real-world benefits like increased user engagement and higher conversion rates.


In essence, CDN Migration is akin to a strategic chess game. Each move must be calculated, risks and rewards weighed, and the endgame always in sight. The challenges are numerous, but they are not insurmountable. 

Published on:
December 28, 2023
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