Rénald Koch

Linux system administrator for nearly 20 years, I support companies in the management, security, and evolution of their IT infrastructure.

Over the course of my assignments, I have 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. It is in this logic that I intervene, whether to resolve a critical incident, strengthen server security, or optimize the performance of an existing platform.

I support both one-off interventions (audits, troubleshooting, optimization) and long-term collaborations in server management, easily integrating into technical teams or working autonomously.

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

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

- setup and administration of web servers (Apache, Nginx),

- database management (MySQL, MariaDB),

- deployment and automation (shell scripts, Docker),

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

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

- system and traffic 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 concentrate on your business, with the assurance that your infrastructure is robust, secure, and scalable.