June 30, 2024, is a date that has permanently been marked in the calendars of IT administrators worldwide. This was the day that marked the end of life (EOL) of one of the most popular server Linux distributions – CentOS Linux 7. For hundreds of thousands of companies that for years have based their infrastructure on this free and stable system, this means one thing: the necessity to make a strategic decision about migration. Remaining on an unsupported operating system is no longer a matter of savings, but consciously accepting enormous and unacceptable risk.
In this new reality, the natural and safest direction of evolution is transitioning to the platform from which CentOS originated – Red Hat Enterprise Linux (RHEL). This is not just a return to the source, but above all a step toward a professional, fully supported, and secure corporate environment. In this guide, we will explain what the end of support for CentOS 7 practically means, what risks are associated with it, and how to strategically and effectively plan and conduct migration to RHEL to ensure your company’s stability and security for years to come.
What Is Red Hat Enterprise Linux (RHEL) and Why Is It a Business Standard?
Red Hat Enterprise Linux (RHEL) is a commercial Linux operating system distribution, created and supported by Red Hat. It was designed from the ground up with corporate applications in mind, where stability, security, performance, and long-term, predictable technical support are absolute priorities. RHEL is the foundation on which the most critical systems operate in the largest banks, stock exchanges, telecommunications companies, and government agencies worldwide.
Unlike free, community distributions, RHEL is a product backed by specific responsibility and guarantee. Each of its versions goes through a rigorous testing and security hardening process. Crucially, RHEL has an enormous ecosystem of hardware and software certifications. This means that the largest server manufacturers (Dell, HPE) and software producers (SAP, Oracle) officially test and support their solutions on the RHEL platform, giving companies confidence of trouble-free integration and operation.
The RHEL business model is based on subscription, which is something much more than just a license. It gives access not only to the software itself, but to an entire ecosystem of value: professional 24/7 technical support with guaranteed response time (SLA), constant access to updates and critical security patches, a huge knowledge base, and advanced management tools. All this makes RHEL recognized as the de facto standard for any serious company that treats its IT infrastructure as a strategic asset, not just a cost.
📚 Read the complete guide: IAM / Zero Trust: Zarządzanie tożsamością i dostępem - od podstaw do Zero Trust
What Does End of Support (EOL) for CentOS 7 Mean and What Risks Are Associated?
End of support (End of Life, EOL) for CentOS 7 as of June 30, 2024, means that this system has stopped receiving any official updates, including, most importantly, security patches. Although existing servers with CentOS 7 still work, with each passing day they become more vulnerable to attacks and dangerous for the entire organization.
The main risks associated with staying on a system after EOL date are:
-
Lack of security patches: This is the biggest threat. Every newly discovered vulnerability in the Linux kernel or in key system packages (such as OpenSSL, glibc) will no longer be patched in CentOS 7. These servers become a “ticking bomb,” an easy target for hackers who actively scan the internet looking for unsupported systems.
-
Compliance problems: Many regulations and standards (e.g., PCI DSS for the payment industry, HIPAA for medical, and also GDPR requirements) require companies to use software that is actively supported by the manufacturer. Maintaining a system after the EOL date can lead to a negative audit result, loss of certification, or penalties.
-
Lack of support from software vendors: Business software manufacturers (e.g., databases, application servers) also stop supporting their products on unsupported operating systems. In case of an application problem, its vendor may refuse help, pointing to an outdated system.
-
Growing technical debt: Maintaining an outdated system makes it difficult to implement new technologies and leads to increasing compatibility problems, which in the future will make migration even more difficult and costly.
In practice, continuing to use CentOS 7 in a production environment is extremely irresponsible and constitutes consciously exposing the company to enormous financial, operational, and reputational risk.
What Is CentOS Stream Now and Why Isn’t It a Direct Successor to CentOS 7 for Companies?
After announcing the end of traditional CentOS, Red Hat together with the CentOS Project shifted all attention to CentOS Stream. This is a key change that every company planning migration must understand. CentOS Stream is not a direct successor or replacement for CentOS 7 in the context of production applications.
Historically, CentOS was a “downstream” (derivative release) of RHEL. This meant that Red Hat first released a new, stable version of RHEL, and then the CentOS community took its source code and created a free, binary-identical equivalent. CentOS Stream reverses this model and becomes an “upstream” (development release) for RHEL. This means that new features and patches first go to CentOS Stream, where they are tested by the community, and only later, after further stabilization, are included in future RHEL releases.
This change has fundamental consequences for companies. CentOS 7 was synonymous with stability because it was based on already released and tested RHEL. CentOS Stream is by nature a “rolling release” distribution – it is more dynamic, updates appear much more frequently, and it may potentially be less stable. It is an excellent platform for developers, enthusiasts, and companies that want early insight into technologies that will enter future versions of RHEL and want to actively participate in their development.
However, for organizations that valued CentOS 7 for its predictability, reliability, and long life cycle, and that need a platform for critical production systems, CentOS Stream is not an appropriate choice. The direct, natural successor to CentOS 7’s stability and reliability philosophy is Red Hat Enterprise Linux.
Summary Card: CentOS 7 vs. CentOS Stream vs. RHEL
| Feature | CentOS Linux 7 (until 06.30.2024) | CentOS Stream | Red Hat Enterprise Linux (RHEL) |
|---|---|---|---|
| Relationship to RHEL | Downstream (RHEL clone) | Upstream (RHEL development version) | Final product |
| Stability | Very high, rare changes. | Lower, frequent updates (rolling). | Highest, predictable life cycle. |
| Purpose | Stable production environments. | Development, testing, R&D. | Critical production environments. |
| Support | Community (ended). | Community. | Professional, commercial (Red Hat). |
| For whom? | (Historically) Companies looking for free RHEL. | Developers, ecosystem partners. | Companies and institutions (Enterprise). |
What Are the Main Business Benefits of Migrating from CentOS to RHEL?
Migration from the no longer supported CentOS 7 to the Red Hat Enterprise Linux platform is not only an action aimed at minimizing risk, but a strategic investment that brings a number of measurable business and technological benefits.
1. Access to professional technical support: This is the most important and most tangible benefit. In case of a critical system failure or performance problems, the company is no longer dependent on internet forums. RHEL subscription gives access to support from Red Hat engineers 24/7 with guaranteed response time (SLA), which allows for drastically shortened downtime and minimized financial losses.
2. Predictability and life cycle stability: RHEL offers a long, 10-year support cycle for each major version. This gives the company certainty and predictability, enabling long-term infrastructure development planning without fear of sudden support termination or revolutionary changes.
3. Increased security and compliance: Red Hat proactively delivers certified security patches, and the system itself has built-in, advanced mechanisms (like SELinux) and hardening profiles (SCAP). Having a fully supported and certified operating system is crucial for meeting regulatory requirements (GDPR, NIS, PCI DSS) and successfully passing audits.
4. Access to the full Red Hat ecosystem: RHEL subscription is a gateway to the entire portfolio of integrated and supported Red Hat products, such as the Ansible automation platform, Satellite management platform, or the market-leading OpenShift container platform. This allows for building a cohesive, modern, and fully supported hybrid infrastructure.
What Does the Migration Process from CentOS 7 to RHEL Look Like in Practice?
The migration process from CentOS 7 to Red Hat Enterprise Linux must be carefully planned to proceed smoothly and safely, minimizing the risk of downtime. Although automation tools are available, a methodical approach is key.
Phase 1: Analysis and Inventory. The first step is a thorough inventory of all servers with CentOS 7. You need to identify what applications and services run on each machine, what their dependencies are, and how critical they are to the business. Full backups of all systems should also be made before starting any actions.
Phase 2: Planning and Choosing Migration Method. A decision must be made about the migration method. There are two main paths:
- “In-place” migration: Involves direct conversion of the existing CentOS 7 system to RHEL 7 system using the Convert2RHEL tool. Then, an upgrade from RHEL 7 to a newer version, such as RHEL 8 or RHEL 9, can be performed. This is a faster method, but requires great care.
- Migration through re-installation (re-provisioning): Involves building new, clean servers with the latest version of RHEL, and then transferring applications and data from old CentOS servers. This is a safer, more time-consuming method, but gives the opportunity to “clean up” and implement a new, clean configuration.
Phase 3: Testing and Pilot Migration. Regardless of the chosen method, it is crucial to conduct a pilot migration on less critical systems or in a test environment. This allows for verifying the procedure, testing application operation on the new system, and identifying potential problems before migrating production systems.
Phase 4: Actual Migration and Verification. Migration of production systems should be best performed during planned service windows. After the process is complete, you should thoroughly verify that all applications and services work correctly, and then shut down and archive old CentOS servers.
What Does a Red Hat Subscription Include and Why Is It More Than Just an Operating System?
Red Hat’s business model is based on subscriptions, not traditional software licenses. This is a fundamental difference. When buying a RHEL subscription, the company is not paying for the software itself (whose source code is largely open), but for access to a comprehensive value package that includes software, support, knowledge, and lifecycle management.
Key elements included in a Red Hat subscription are: 1. Access to certified software: Subscription gives access to stable, tested, and hardened versions of RHEL and to a huge ecosystem of certified software in official repositories. 2. Technical support: This is one of the most important elements. Subscription entitles you to use professional technical support provided by Red Hat engineers, available 24/7 with guaranteed response time (SLA). In case of a critical failure, the company is assured of receiving expert help. 3. Access to patches and security updates: Subscription guarantees constant access to a stream of updates, bug fixes, and most importantly, critical security patches. A dedicated Red Hat Product Security team proactively monitors threats and delivers patches in very short time. 4. Access to customer portal and knowledge base: Subscribers receive access to a huge portal that contains thousands of technical articles, guides, documentation, and diagnostic tools. 5. Product lifecycle management: Red Hat guarantees a long, 10-year lifecycle for each major version of RHEL, which ensures predictability and stability.
A subscription is therefore a form of partnership and insurance. The company pays for certainty that its key infrastructure relies on a stable, secure, and fully supported platform, which allows it to focus on its own business activities, rather than on “putting out fires” in the server room.
What Tools, Such as Convert2RHEL, Facilitate the Migration Process?
Red Hat is perfectly aware of the challenges companies faced after announcing the end of CentOS 7 and provides dedicated tools that aim to maximally simplify and automate the migration process. The most important of these is Convert2RHEL.
Convert2RHEL is an official, fully supported by Red Hat command line tool that allows for “in-place” conversion from CentOS Linux operating system (and other RHEL clones, like Oracle Linux) to a fully functional and supported Red Hat Enterprise Linux. This tool automatically replaces CentOS system packages with their equivalents from RHEL repositories, while maintaining existing configuration, applications, and data.
The main advantage of Convert2RHEL is elimination of the need to build new servers and manually transfer data. The conversion process is largely automated and much faster than traditional migration. This tool performs a series of preliminary tests (pre-conversion analysis) to check whether the system is suitable for conversion, and informs about any problems that need to be resolved before starting the process.
However, it should be remembered that although Convert2RHEL is a powerful facilitation, it does not exempt from the need for careful planning and testing. You should always start with a full system backup, and perform the first conversion on a test or less critical machine. This tool is invaluable technical support, but the success of the entire migration project still depends on a well-prepared strategy.
Why Is Security (e.g., SELinux, Regular Patches) a Key Argument for RHEL?
In today’s threat landscape, operating system security is absolutely crucial. Migration from unsupported CentOS 7 to RHEL is primarily a huge step forward in security. RHEL offers a multi-layered, proactive approach to protection that is unachievable in community distributions.
The main argument is access to regular, timely, and certified security patches. A dedicated Red Hat Product Security team constantly monitors global vulnerability databases, analyzes threats, and prepares patches for all supported versions of RHEL as a priority. Subscription guarantees that the company receives these patches immediately upon release, which allows for quick patching of critical vulnerabilities before they are exploited by attackers. In the case of a system past EOL date, the company remains defenseless.
The second pillar is built-in system hardening, and its most important element is SELinux (Security-Enhanced Linux). This is an advanced mandatory access control mechanism that significantly limits potential damage even in case of a successful attack. Unlike many other distributions, where SELinux is sometimes treated as a problem and disabled, in the Red Hat ecosystem it is fully integrated and supported, and its proper configuration is a key security element.
Additionally, RHEL offers security certifications, such as FIPS 140-2 or Common Criteria, which are required in many regulated industries (government, financial sector). Availability of compliance automation tools, such as SCAP profiles, allows for easy hardening of systems according to rigorous standards. All this makes RHEL a platform that provides a much higher and more predictable level of security than any community distribution.
How to Manage the New Fleet of RHEL Servers After Migration Using Ansible and Satellite?
Migration to RHEL is an ideal time to implement modern, automated infrastructure management methods that will replace manual, error-prone administration. The Red Hat ecosystem offers two powerful, complementary tools for this purpose: Red Hat Satellite and Ansible Automation Platform.
Red Hat Satellite becomes the central point of lifecycle management for the entire fleet of RHEL servers. After migration, all new servers should be registered in Satellite. This will allow for:
-
Central subscription management.
-
Controlled distribution of patches and updates: You can create a lifecycle (e.g., DEV -> TEST -> PROD) and deploy updates safely, after prior testing.
-
Standardized provisioning: Every new server needed in the future can be installed automatically from Satellite, based on the same, hardened “golden image.”
Ansible Automation Platform is in turn a tool for configuration management and task automation. After migration, instead of manually configuring individual servers, you should define their desired state in the form of code (Ansible playbooks). Ansible will ensure that all servers in a given group (e.g., all web servers) have identical, standard-compliant configuration. It can also be used to automate daily tasks, such as deploying applications, creating users, or restarting services.
The combination of Satellite and Ansible creates a powerful platform for managing infrastructure as code (Infrastructure as Code). Satellite takes care of the operating system, and Ansible takes care of what runs on that system. Such an approach drastically increases efficiency, eliminates “configuration drift,” increases security, and allows for easy infrastructure scaling in the future.
How Can nFlo Help Your Company with Safe and Effective Migration from CentOS 7 to Red Hat Enterprise Linux?
The end of support for CentOS 7 poses an urgent and complex challenge for your company. At nFlo, we perfectly understand that migrating critical operating systems is a process that requires not only deep technical knowledge, but above all careful planning, risk management, and precise execution. Our team of certified Red Hat engineers is ready to become your trusted partner in this transformation.
Our services start with comprehensive analysis and creating a migration strategy. We conduct a detailed inventory of your current CentOS 7-based infrastructure, identify dependencies between systems, and assess application compatibility. Together with you, we choose the optimal migration path – whether it will be “in-place” conversion using Convert2RHEL, or safer migration through building new infrastructure. We create a detailed schedule and project plan that minimizes risk and impact on current business operations.
We support you in the entire technical process. Our engineers help in preparing a standard, hardened RHEL system image, configuring automation tools, and then conducting pilot and production migration, taking care of every detail. Our expertise in cybersecurity is a guarantee that new infrastructure will be configured from the very beginning according to best practices, with implemented SELinux policy and regular patching mechanisms.
Our role doesn’t end with migration. We also help implement modern tools, such as Ansible and Satellite, so that your new fleet of RHEL servers is managed efficiently, automated, and securely. By choosing nFlo, you gain not just a contractor, but a partner who will guide you through the entire process – from understanding the risk associated with CentOS 7, to stable and secure operation on the Red Hat Enterprise Linux platform.
Related Terms
Learn key terms related to this article in our cybersecurity glossary:
- Network Security — Network security is a set of practices, technologies, and strategies aimed at…
- Cybersecurity — Cybersecurity is a collection of techniques, processes, and practices used to…
- Cybersecurity Incident Management — Cybersecurity incident management is the process of identifying, analyzing,…
- Security Architecture — Security architecture is a comprehensive approach to designing, implementing,…
- IT Security Audit — IT security audit is a systematic evaluation of an organization’s information…
Learn More
Explore related articles in our knowledge base:
- How to secure IoT in the enterprise? - Best practices
- API and Web Services Security: How do you effectively protect the digital bridges that connect your applications and data?
- API Security: Security in the microservices era
- Automotive cybersecurity: How to protect modern, connected vehicles?
- Modular Structure of baramundi Management Suite – Flexibility and Efficiency
Explore Our Services
Need cybersecurity support? Check out:
- Security Audits - comprehensive security assessment
- Penetration Testing - identify vulnerabilities in your infrastructure
- SOC as a Service - 24/7 security monitoring
Explore Our Products
Solutions mentioned in this article that can help protect your organization:
- Red Hat Enterprise Linux (RHEL) — Red Hat
- Red Hat Satellite — Red Hat
- baramundi Management Suite — baramundi
Related topics
See also:
