Ubuntu HA Cluster Mentorship & Development

@tangramua

Dear ,   We carefully studied the description of your project and we can confirm that we understand your needs and are also interested in your project. Our team has the necessary resources to start your project as soon as possible and complete it in a very short time.   We are 25 years in this business and our technical specialists have strong experience in PHP, Linux, Apache, MySQL, Ubuntu, MariaDB, Docker, Kubernetes, Cluster Computing and other technologies relevant to your project.   Please, review our profile https://www.freelancer.com/u/tangramua where you can find detailed information about our company, our portfolio, and the client's recent reviews.   Please contact us via Freelancer Chat to discuss your project in details.    Best regards, Sales department Tangram Canada Inc.     

@AZTURK1

Hi there, I will coach and build an Ubuntu-based HA stack with you step-by-step , I’ve deployed Mailcow on Docker, hardened Ubuntu, and run MariaDB clusters in production, so I’ll teach practical, production-safe procedures while we build together. - Deliverable: Live paired sessions (screen-share + terminal) walking Ubuntu hardening → Docker/K3s setup → Mailcow deployment and Apache PHP apps integration. - Deliverable: MariaDB Cluster setup (Galera or automated failover master‑slave), replication tests and failover drills. - Deliverable: 3-way backup design and documented restore: local snapshots, hot-standby, off-site (S3/rsync) with fully-testable restore playbook. - Risk/quality control: Staged deploys, pre-flight checks, automated backups, rollback and failover test runs to guarantee minimal downtime. Step-by-step training plan: Week 1 Ubuntu fundamentals & hardening; Week 2 Docker basics → Compose; Week 3 K3s/MicroK8s orchestration patterns; Week 4 Mailcow container internals, DNS, MX flow; Week 5 MariaDB clustering, replication and failover drills; Week 6 Backup/restore workshops and runbooks. Project implementation plan (timeline): Day 1-3: infra prep (networks, SSH hardening, DNS). Day 4-9: build cluster (K3s), deploy Mailcow & Apache, configure MariaDB cluster. Day 10-14: backups, failover tests, performance tuning, documentation and handover. Skills: ✅ Ubuntu Server ✅ Docker & K3s (or MicroK8s) ✅ Mailcow / Apache / PHP integration ✅ MariaDB replication / Galer

@ixorawebmob

Hello, I’ve gone through your project details, and this is something I can definitely help you with. I have over 10 years of experience in systems architecture and mentoring, specifically with Ubuntu environments, Docker, and Kubernetes. My focus will be on enabling you to gain full control of the High Availability (HA) setup, so you can confidently manage, scale, and troubleshoot the infrastructure. **Step-by-Step Training Plan:** I will start with a solid foundation in Ubuntu basics, gradually moving to Docker and Kubernetes orchestration. We will then integrate Mailcow, implement MariaDB replication strategies, and finalize with security best practices. **Project Implementation Plan:** We can establish the production environment in phases, first setting up the base OS, followed by Docker installation, and then progressively adding each crucial component of your stack, all accompanied by hands-on training sessions. You can check my portfolio here: https://www.freelancer.in/u/ixorawebmob. I’m eager to partner on this journey with you and establish a long-term relationship for ongoing support. Could you share your current level of familiarity with Ubuntu and container orchestration technologies? Let’s discuss over chat! Regards, Arpit

@gattes

Hi there, I have over 10 years work experience with linux and server management as DevOps/SRE. I think I can definitely help you out but you have to know, there's ZERO chance of downtime, there will always be risk. As long as you are aware of that we can proceed! Ping me and I'll help you out. Cheers!

@juanjosec63

Hi, I have strong hands-on experience with Ubuntu Server, Docker, K3s, Mailcow, Apache, and MariaDB clustering (Galera and replication), including building HA systems with backup strategies and real-world failover handling. I’ll work with you step by step, starting from a hardened Ubuntu base, then layering Docker and K3s, deploying Mailcow and Apache services, setting up MariaDB cluster with replication and failover, and finally implementing a 3-way backup system (local, hot standby, off-site) that you can fully restore and manage yourself with confidence. You can expect clear communication, practical teaching during implementation, and a high-quality result that fits seamlessly into your long-term operational goals. Best regards, Juan

@vishal1145

Your MariaDB cluster will fail during the first network partition if you don't implement proper quorum handling and split-brain prevention. I've seen this exact scenario take down production systems when teams skip STONITH configuration or rely on basic master-slave replication without automated failover logic. Before we architect the HA stack, I need clarity on two things: What's your current traffic baseline and growth projection? If you're handling 500 concurrent users versus 5,000, the cluster topology changes completely - three-node Galera versus five-node with ProxySQL load balancing. What's your RTO/RPO requirement? If you can tolerate 5 minutes of downtime during failover, we can use simpler orchestration. If you need sub-30-second recovery, we're implementing Keepalived with floating IPs and automated health checks. Here's the architectural approach: - UBUNTU HARDENING: Implement AppArmor profiles, disable root SSH, configure UFW with port whitelisting, and set up fail2ban with custom jails for Apache/Mailcow - this prevents 90% of common attack vectors. - KUBERNETES (K3S): Deploy a 3-node K3s cluster with etcd HA, configure pod anti-affinity rules so Mailcow and Apache never run on the same node, and implement Longhorn for distributed storage with automatic volume replication. - MARIADB GALERA CLUSTER: Set up 3-node Galera with garbd arbitrator to prevent split-brain, configure wsrep_cluster_address for automatic node discovery, and implement ProxySQL for query routing with health checks that detect lagging nodes. - MAILCOW HA: Deploy Mailcow across multiple nodes using shared storage for mail data, configure Redis Sentinel for session failover, and set up HAProxy for SMTP/IMAP load balancing with SSL termination. - 3-WAY BACKUP: Implement Restic for encrypted incremental backups to local NAS (15-minute snapshots), hot-standby server (hourly sync via rsync), and Backblaze B2 (daily off-site). I'll document the exact restore procedure so you can rebuild from bare metal in under 2 hours. I don't do cookie-cutter deployments. Every HA setup I've built has different failure modes based on workload patterns. I've mentored 8 engineers on production Kubernetes clusters and taught them to troubleshoot without panicking when pods crash at 3am. Here's how knowledge transfer works: Week 1, we build the base Ubuntu cluster together while I explain every sysctl tuning decision. Week 2, you deploy MariaDB Galera under my supervision and intentionally break replication to learn recovery. Week 3, we integrate Mailcow and Apache, then simulate node failures to verify failover. Week 4, you execute a full disaster recovery drill from your backups while I watch. I bring 12 years of Linux infrastructure experience including a healthcare SaaS platform that handled 2M emails daily across a 5-node cluster with zero unplanned downtime for 18 months. Let's schedule a 20-minute call to discuss your current infrastructure and failure scenarios before committing to the build.

@AlexDeveloper911

Hey, I am ready when you are.✅ I’ve worked on something very similar. Setting up a high-availability (HA) SaaS infrastructure on Ubuntu Server can be challenging, especially ensuring zero downtime and sovereignty over the backup system. What really matters here is the full knowledge transfer and hands-on learning experience. I have hands-on experience with setting up Docker-based Mailcow, Apache for PHP applications, and MariaDB replication. While I haven't done this exact project, I've worked on similar setups involving HA clusters and automated failover solutions. Let's chat! -Oleksandr

@asimaarbi

Hi,I will work with you as a true co builder and mentor to design and implement a high availability Ubuntu environment step by step starting from system hardening fundamentals and moving into Docker orchestration with K3s or MicroK8s then layering in Mailcow Apache and a properly engineered MariaDB cluster using Galera or automated failover depending on your workload with every decision clearly explained and documented so you fully understand and own the system we will progress in structured phases over about three to five weeks covering foundation setup container orchestration core services high availability replication and finally backup and disaster recovery and I will make sure you can independently restore the full three way backup strategy including local hot standby and off site while also guiding you through real failure scenarios so you gain practical confidence and I will remain available afterward for ongoing support scaling and troubleshooting as your platform grows

@billybryan98

Hello there, I’ve spent years architecting high-availability Linux infrastructure and I’m confident I can guide you from basics to a robust Ubuntu HA SaaS stack. I’ll mentor you through hardened Ubuntu setup, Docker and Kubernetes (K3s/MicroK8s), Mailcow in Docker, Apache-based web services, and a resilient MariaDB cluster with automated failover. My approach focuses on practical, hands-on learning with clear, reproducible steps so you can maintain, troubleshoot, and scale the system on your own. I’ve built and operated HA environments with containerized services, implemented multi-node MariaDB clusters, and designed 3-way backup strategies that are fully restorable. I will tailor each session to your setup, ensuring you master the stack from fundamentals to advanced orchestration and disaster recovery. I can handle the work using my deep experience and your requirements, delivering a clean, hardened, production-ready architecture and thorough knowledge transfer that stands up to real-world use. Please feel free to contact me to discuss details and a practical timeline. I’m looking forward to the chance of working together. Best regards, Billy Bryan

@ayesha86664

Hi there! You are building a high-availability Ubuntu cluster with Mailcow, Apache, and MariaDB replication, and the real challenge is combining hands-on implementation with live, step-by-step knowledge transfer — that is exactly where most setups fail. I have mentored engineers while architecting HA Docker and Kubernetes clusters on Ubuntu, including MariaDB Galera replication with automated failover, and successfully guided them to operate the stack independently. My approach ensures you’ll fully understand security hardening, backup restoration, and zero-downtime failover processes. I will walk you through a structured training plan covering Ubuntu fundamentals, Docker/Kubernetes orchestration, Mailcow integration, Apache tuning, and MariaDB replication, while building each layer live on your HA cluster, documenting every step for complete autonomy. Check our work: https://www.freelancer.com/u/ayesha86664 Do you prefer interactive command-line sessions, screen-share walkthroughs, or a mix of both for hands-on training? I am ready to start — just say the word. Best Regards, Ayesha

@mahads31

Hello, I’ve carefully reviewed your project Ubuntu HA Cluster Mentorship & Development and it’s something I can confidently handle. I’m a professional developer with strong experience in Kubernetes, Cluster Computing, Apache, Ubuntu, Docker, Linux, MariaDB, PHP and MySQL, delivering reliable and high-quality solutions with clean code and efficient performance. I ensure every project is handled with attention to detail and a results-driven approach to meet your expectations. If you’ve shared any files or details, I’ll review them and provide quick feedback. Let’s connect and get started right away you can also check my profile reviews for similar work. Regards, Mahad Sheikh

@Alesha1018

I'd be delighted to help you build a high-availability HA Ubuntu Cluster. Here's my proposal: As a seasoned software engineer with 15 years of experience, I'm confident in my ability to guide you through the process of setting up a robust HA Ubuntu Cluster on Mailcow, Apache, and MariaDB Replication. My practical approach focuses on clear communication, delivering results, and smooth knowledge transfer. I'd create a step-by-step training plan to take you from Ubuntu basics to MariaDB Cluster expertise. My project implementation plan would ensure a seamless setup of the production environment, meeting your zero-downtime and sovereignty requirements. Let's collaborate to build a reliable and maintainable system.

@ivicab6

As a full-stack engineer with over six years of experience, I have a proven track record of building and shipping production web applications end-to-end. My wide range of skills includes both frontend and backend development, database management, and system integration. These skills make me particularly well-suited for your project as they align perfectly with the requirements – especially in regards to using Ubuntu Server, Docker & Kubernetes, Mailcow, Apache, and MariaDB Replication. What sets me apart is not just my technical expertise but also my teaching mindset. I believe in empowering my clients by imparting my knowledge onto them, enabling them to independently maintain, troubleshoot, and scale their systems. I am committed to walking side by side with you throughout the project, serving as both your technical mentor and operational architect. Furthermore, my experience with automating business processes will help ensure that your system runs smoothly with minimum manual intervention. Choosing me for your project doesn't just mean getting a job done; it means gaining a long-term partner for future Q&A and support as well. I truly believe in establishing meaningful relationships with clients beyond delivery and invest myself fully into their success. Let's embark on this journey together; I assure you zero downtime and complete sovereignty over your 3-way backup strategy!

@emilesd617

Hi, I am a full-stack developer with 8 years of rich experience with a background in Linux infrastructure and HA systems. I am familiar with Ubuntu, Docker, Kubernetes, MariaDB, Apache. For this project, the most important part is building the system together with clear knowledge transfer, because you need to understand every layer to maintain and scale it independently. I will guide you step by step while setting up the HA cluster, covering deployment, failover, backups, and recovery in a practical way. I'm an individual freelancer and can work on any time zone you want. Please contact me with the best time for you to have a quick chat. Looking forward to discussing more details. Thanks. Emile.

@pasion0128

★•══•★ Hi client ★•══•★ Thanks for posting such a detailed project—your goals perfectly match my expertise. I bring over 10 years of experience in Linux, Docker/Kubernetes orchestration, MariaDB clustering, and HA SaaS environments. I will act as your Co-Pilot, building the HA Ubuntu stack step-by-step while teaching you: Ubuntu fundamentals, hardened Docker/K8s deployment, Mailcow integration, Apache configuration, MariaDB replication, and automated failover. You’ll gain full autonomy, including rebuilding the 3-way backup system and troubleshooting zero-downtime scenarios. Estimated timeline: 2–3 weeks including hands-on mentoring sessions. Proposed budget: € 750 EUR, milestone-based to match setup and learning phases. I’m committed to knowledge transfer and operational sovereignty, ensuring you can maintain, scale, and secure the infrastructure independently. Shall we start by reviewing your current servers and outline the stepwise deployment plan together?

@rogelitoc

Hello, In my opinion, the problem of this project is that achieving high availability while ensuring full knowledge transfer requires a well-structured mentorship approach alongside robust system design. I will implement a layered architecture using Ubuntu Server as the base, orchestrating containers with K3s for lightweight management. Mailcow will be deployed within Docker, while Apache serves web applications. For the database, I will configure a MariaDB cluster with Galera to ensure automated failover. I will teach you step-by-step, starting from Ubuntu basics, moving through Docker orchestration, and culminating in setting up the replication strategy. The deliverable includes a fully operational HA SaaS environment, complete documentation, and a personalized training guide for self-management and troubleshooting. My extensive background in building scalable, HA systems makes me an ideal fit for this role. I can start immediately. Regards.

@johnedwardl

Hi, I will guide you in building a high-availability Ubuntu Server infrastructure with Mailcow, Apache, and a resilient MariaDB cluster. My experience with similar tech stacks ensures I can deliver a robust system while empowering you with the knowledge to maintain and scale it. The training plan will start with Ubuntu fundamentals, progressing through Docker orchestration, Mailcow setup, and finally, implementing a MariaDB cluster with automated failover. Each session will include hands-on practice, ensuring you gain confidence in managing the system. For the project implementation, we will map out a clear timeline, starting with environment setup, followed by configuration, testing, and final rollout, ensuring zero downtime throughout. I will also develop a comprehensive backup strategy you can manage independently, focusing on local, hot-standby, and off-site solutions. Let’s discuss how we can start this journey together and ensure you have the skills and support for long-term success. Thank you.

@oscarmalvarez6

Hello, I’ve guided founders through building and operating HA Ubuntu clusters (Docker/K3s, Mailcow, MariaDB replication) with full knowledge transfer so they can run systems independently. For your case, we’ll work in live sessions where I co-build with you: start with hardened Ubuntu + networking basics, move into Docker/K3s orchestration, then deploy Mailcow, Apache, and a MariaDB cluster (Galera/failover), followed by a 3-way backup system you can fully restore yourself. I’ll provide a clear phased plan, hands-on walkthroughs, and ongoing Q&A to ensure true sovereignty and zero-downtime readiness. Oscar

@silvernsaka

Hello, This is exactly the kind of hands-on, mentorship-driven project I enjoy. I’m a US-based senior backend and security engineer with strong experience in Linux infrastructure, HA systems, and teaching complex setups in a practical, understandable way. Step-by-Step Training Plan Foundations: Ubuntu hardening, networking, SSH, firewall (UFW), fail2ban Containers: Docker fundamentals → volumes, networking → Mailcow deployment Orchestration: K3s setup, node architecture, service scaling & failover Database: MariaDB replication (start with master-slave → move to Galera), failover testing Web Layer: Apache + PHP apps with reverse proxy & load balancing Backups: 3-way strategy (local, hot standby, off-site) + full restore drills Monitoring: Logs, alerts, and troubleshooting real failure scenarios Implementation Plan Week 1: Ubuntu setup, security baseline, Docker + Mailcow Week 2: K3s cluster + Apache services Week 3: MariaDB replication + failover testing Week 4: Backup system + full disaster recovery simulation I’ll work with you live, explain every step, and ensure you can rebuild everything independently. Rate: €30/hr Availability: 10 hrs/day, flexible EU overlap Long-term support is absolutely fine—I aim to make you fully self-sufficient. Best, Ijeoma