Senior Linux Specialist – SUSE Linux & Pacemaker Clustering

Job Summary

We are looking for a highly experienced Senior Linux Specialist with strong hands-on expertise in SUSE Linux Enterprise Server (SLES) and Pacemaker cluster installation, configuration, administration, and troubleshooting.

The ideal candidate must have extensive experience implementing and managing Linux high-availability (HA) clustering solutions at the operating system and infrastructure levels.

Key Responsibilities

• Install, configure, administer, and maintain SUSE Linux Enterprise Server (SLES) environments across enterprise infrastructure.
• Design, build, and implement high-availability clusters using Pacemaker and Corosync, including cluster setup from scratch.
• Configure and manage cluster resources, resource agents, constraints, resource groups, fencing mechanisms, and quorum policies.
• Implement and troubleshoot STONITH (Shoot The Other Node In The Head) fencing, watchdogs, and cluster node isolation.
• Configure and manage shared storage, multipath I/O, LVM, filesystems, and storage integration with HA clusters.
• Perform cluster node onboarding, cluster expansion, failover testing, failback validation, and planned maintenance activities.
• Diagnose complex cluster issues involving resource failures, split-brain scenarios, quorum loss, fencing failures, and communication problems between nodes.
• Analyze Pacemaker, Corosync, and Linux system logs to identify root causes and implement permanent resolutions.
• Manage SUSE system patching, kernel updates, security hardening, performance tuning, and OS-level troubleshooting.
• Execute cluster upgrades, configuration changes, disaster recovery exercises, and high-availability validation.
• Develop automation scripts and operational procedures to improve system reliability and reduce manual intervention.
• Collaborate with infrastructure, storage, networking, database, and application teams to ensure platform stability.
• Prepare technical documentation, implementation plans, troubleshooting guides, and operational runbooks.
• Provide advanced production support and participate in incident management and root-cause analysis.

Required Technical Skills

• 13+ years of overall experience in Linux system administration, engineering, and infrastructure support.
• Strong hands-on experience with SUSE Linux Enterprise Server (SLES) installation, configuration, administration, and troubleshooting.
• Extensive practical experience with Pacemaker and Corosync cluster installation and configuration.
• Proven ability to build and configure HA clusters independently, rather than only supporting preconfigured environments.
• Strong knowledge of cluster resource agents, resource management, ordering and colocation constraints, quorum, fencing, and STONITH.
• Experience with cluster failover, failback, node failure recovery, split-brain prevention, and high-availability testing.
• Strong understanding of Linux internals, systemd, networking, storage, filesystems, multipathing, LVM, and kernel-level troubleshooting.
• Experience with cluster diagnostics, log analysis, performance monitoring, and root-cause analysis.
• Knowledge of shell scripting (Bash) and automation for Linux administration.
• Experience managing enterprise production environments and critical infrastructure.