Rénald Koch

Linux Systems Administrator with nearly 20 years of experience, I help companies manage, secure, and evolve their IT infrastructure.

Throughout my missions, I've learned that a reliable information system is not limited to a good initial configuration: it must be stable over time, effectively monitored, and capable of evolving frictionlessly. This is the logic I apply, whether it's resolving a critical incident, strengthening server security, or optimizing the performance of an existing platform.

I assist with both one-off interventions (audits, troubleshooting, optimization) and long-term managed service collaborations, integrating easily with technical teams or working autonomously.

I regularly work on infrastructures hosted by OVHcloud, Amazon Web Services, or other cloud and datacenter providers, with solid experience in critical and high-traffic environments.

On the technical side, I mainly work with Linux environments (Debian, Ubuntu, CentOS, Red Hat) and cover the entire operational chain:

- Setting up and administering web servers (Apache, Nginx),

- Database management (MySQL, MariaDB),

- Deployment and automation (shell scripts, Docker),

- Supervision and monitoring (Zabbix, Xymon, CloudWatch),

- Implementing high availability and load balancing solutions (HAProxy, ELB),

- System and network security,

- Mail server management (Postfix, SPF, DKIM),

- Virtualization and cloud infrastructures (Proxmox, VMware, AWS).

I also work on application hosting projects (WordPress, PrestaShop, SPIP), with a particular focus on performance, security, and stability.

My goal is simple: to allow you to focus on your business, with the assurance that your infrastructure is robust, secure, and scalable.