Proxmox VE Cluster Stability Improvement

@farooqtahir2013

I understand that stable cluster performance is crucial for your Proxmox VE 7.4 environment, and I am confident in my ability to provide a lasting solution to the intermittent flapping and network instability you're experiencing with your two nodes. With over a decade of experience as a Network, Cybersecurity, VoIP and System Engineer, I have dealt with similar complex issues in my career and successfully resolved them. In regards to your project, I possess an extensive understanding of Proxmox VE, Corosync, Linux networking, bonding/bridging, and cluster administration which are all key skills required here. Moreover, my proficiency with troubleshooting complex network issues has equipped me with the ability to pinpoint specific problems such as the MTU reset and network loop you mentioned.

@MRARIFAKRAM

My name is Muhammad Abdullah, an experienced IT professional with a breadth of skills that make me a perfect fit for your project. During my eight years in the field, I have specialized in Linux system administration and virtualization, particularly using tools like Proxmox VE and Corosync. I've successfully managed and optimized various types of clusters, consistently ensuring their stability and performance.

@wallymna

** THIS IS NOT AN AUTOMATIC BID ** Hello, the errors you have described point to four to five directions, the first step would be tuning your corosync configuration as based on what you have mentioned it holds the ring for about 30,000 ms whereas it should have a 5,000 ms timeout so it is auto reformed, second step would be the MTU lock, where the MTU reset is happening because of auto-negotiation with the rejoining node's interface MTU, thirdly the bond0 network loop appears to be an L2 loop, finally for auto-isolation I can write you a .sh script that will allow the node to be self isolated in case of mismatching parameters, all of this needs to be discussed hence I would appreciate if you can drop a message and we can discuss both ends, I will also need you to run some diagnostic commands, the cost of this project will be fixed at 119.99 USD and take about 2-3 hours to discuss and complete. Thank you!

@toriquldev123

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@juanjosec63

Hi, I have gone through your project description and understand you’re looking to stabilize your Proxmox VE cluster and prevent unstable nodes from affecting the rest of the production environment. I have worked on Proxmox clusters, Corosync tuning, Linux networking, bonding/bridging, and HA infrastructure troubleshooting. I’ve handled issues related to node flapping, MTU inconsistencies, token timeouts, and cluster recovery in production environments. For this, I would analyze the logs from the affected nodes, review the bond0 and bridge configuration, tune the corosync settings, and implement safeguards so unstable nodes isolate automatically without impacting the remaining cluster. I can also help with monitoring scripts for MTU changes and node health detection. Best regards, Juan

@engruhulajom

Dear Client, I’m an experienced full-stack developer with over 10 years of experience in web and mobile application development, specializing in building scalable, responsive, and high-performance solutions for diverse business needs. I understand you are looking for a reliable developer to build or improve your project, including web or mobile applications similar to CRM, dashboards, or APIs, and I have worked on similar solutions successfully. My skills in React, Vue, Laravel, PHP, Python, REST APIs, and database design ensure efficient and high-quality delivery. Feel free to share more details or ask questions. I’m ready to refine my approach to match your exact requirements. Looking forward to working with you. Best regards, Md Ruhul Ajom

@adily1

Hey , I just finished reading the job description and I see you are looking for someone experienced in Troubleshooting, Virtualization, System Admin, Ubuntu, Linux, Automation and Network Administration. This is something I can do. Please review my profile to confirm that I have great experience working with these tech stacks. While I have few questions: 1. These are all the requirements? If not, Please share more detailed requirements. 2. Do you currently have anything done for the job or it has to be done from scratch? 3. What is the timeline to get this done? Why Choose Me? 1. I have done more than 250 major projects. 2. I have not received a single bad feedback since the last 5-6 years. 3. You will find 5 star feedback on the last 100+ major projects which shows my clients are happy with my work. Timings: 9am - 9pm Eastern Time (I work as a full time freelancer) I will share with you my recent work in the private chat due to privacy concerns! Please start the chat to discuss it further. Regards, Adil.

@codeandcommand

A 10-node Proxmox cluster this size usually breaks down at the corosync layer, storage I/O, or VLAN misconfiguration. I would pull the cluster logs, check quorum settings, and trace the issue to a specific node or config. I can start today and have a diagnosis within 24 hours, with fixes applied the same day in most cases. These estimates are based on the description as written. Final scope depends on what the logs show. Want to jump on a quick call?

@jeremiasg17

Hello! I’ve dealt with similar Proxmox cluster issues, where node instability caused significant disruptions. In one case, I implemented a solution that improved cluster resilience, ensuring that one unstable node wouldn’t impact the others. I can share the implementation details in chat. For your situation, I would recommend tuning the Corosync configuration, specifically focusing on token timeouts and MTU settings, while also creating a monitoring script that can isolate problematic nodes automatically. Have you considered exploring different bonding modes for your network interfaces to avoid loops? If you’re open, I can share my similar build and we can see if it fits your requirements. Looking forward to your thoughts!

@bonifacyp2

Hello, With over 10 years of professional experience in Systems Administration, I am well-versed and thoroughly experienced in the management and maintenance of complex server infrastructures, such as the one detailed in your project. I have an advanced understanding of Proxmox VE, Corosync, Linux networking, bonding/bridging and cluster administration - skills that align closely with your key project requirements. To address your current issue with node instability and the toggling MTU settings, I will utilize my deep understanding of Corosync's token handling and network configuration. This will enable me to design a streamlined, stable cluster architecture that isolates any unpredictable nodes without compromising the integrity and performance of the entire system. Additionally, I can offer insights into best practices for bond0 configuration to prevent network loops - an issue you've rightly identified as a suspected root cause. My approach is to build infrastructure solutions that adapt to their environments rather than forcing environments to accommodate infrastructure changes. Considering this, I'll recommend well-tested Corosync and Linux networking configurations tailored specifically for your needs. Thanks!

@patricko098

We recently completed a Proxmox cluster optimization that improved stability by isolating unstable nodes automatically and preventing cluster-wide failures. I am new to Freelancer but have experience contributing to large scale projects alongside teams at Google and Amazon where I handled cluster reliability and network configuration challenges. Your project requires a clean, efficient, and scalable Corosync and network bonding configuration that isolates flapping nodes without impacting the entire cluster. The solution should be user friendly, prevent network loops, and include monitoring to detect MTU changes with automated node isolation. I focus on simplicity and structure to build long term, reliable solutions without unnecessary complexity, ensuring systems work correctly from day one. I am ready to start designing a robust setup aligned with your operational needs. If this aligns with your project, feel free to reach out to discuss scope and pricing. Regards Patrick

@Andyloredo

The recurring MTU reset and subsequent cascading failures point to a Corosync configuration vulnerability exacerbated by the bond0 instability. I’ve previously resolved similar Proxmox cluster instability issues by focusing on Corosync parameter tuning and robust bonding configurations to prevent network loops, specifically addressing token handling and MTU consistency across nodes. Given the provided confirmation that stopping corosync resolves the issue, I’ll prioritize analyzing the logs and identifying the specific Corosync parameters and bond0 settings contributing to the flapping behavior.

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@OBRY8246

Hi, This looks like a network + Corosync issue — especially with MTU dropping and the loop warning on bond0. I can review your logs and guide you to: - Fix the bond/bridge config (likely loop or MTU mismatch) - Stabilize Corosync so one bad node doesn’t affect the cluster - Add a simple check to auto-isolate flapping nodes I’ve handled similar Proxmox cluster instability cases, so I know where to look. Happy to start with your logs and give quick actionable fixes. Best regards Alan

@haseebs74

Hi, I’ve worked with Proxmox clusters and this looks like a classic case where one unstable node is taking down the whole cluster due to Corosync + network behavior. The fact that everything stabilizes when you stop corosync on those nodes makes it clear — we need to make sure a bad node isolates itself instead of affecting others. I can help you: Review your logs and current config Fix corosync settings (token, MTU handling, stability) Identify and correct the bond0/network loop issue Set up a simple way to detect and isolate unstable nodes automatically We can do it step by step with your logs and testing during your maintenance window. If you share your corosync config and bond setup, I can start right away.