Linux/Unix System Administrator

Overview

We are looking for a Linux/Unix System Administrator to provide production support and maintain a variety of Linux and Unix operating systems. You will work with multiple distributions and platforms, ensuring system stability, security, and performance in a 24/7 production environment.

Key Responsibilities

• Provide production support for applications running on SUN Solaris, Red Hat Linux, Oracle Linux, Ubuntu, and AIX.
• Install, upgrade, and maintain Oracle Linux 8/7, RHEL 8/7/6, and Ubuntu systems.
• Integrate and manage network services including NFS, DNS, NTP, Samba, and implement SFTP servers.
• Troubleshoot network protocols such as DNS, TCP/IP, SMTP, and SNMP.
• Manage incidents and requests using ticketing tools like ServiceNow, BMC Service Desk Express, and Quick Base.
• Write shell scripts (ksh, bash, perl) to automate database, application, backup, and scheduling tasks.
• Handle storage management, disk management, multipathing, Logical Volume Management (LVM), and logical partitioning.
• Manage user accounts, system security, change management, and performance tuning.
• Install SSL certificates, patches, hardware/software, and firmware upgrades.
• Provide on-call support and collaborate with vendors to resolve system issues in a 24/7 production environment.
• Enforce security hardening policies and ensure compliance during audit cycles.
• Integrate Linux systems with Active Directory to enable Single Sign-On (SSO).
• Deploy custom syslog reporting solutions using rsyslog and MySQL for system alerts and notifications.
• Deploy servers using custom repository templates to maintain a stable Linux environment.
• Monitor system resources including CPU, memory, disk, and swap to prevent performance issues.
• Administer software packages and patches, including installation, removal, and updates.
• Maintain thorough documentation of system activities, patch levels, disk space, memory usage, and user activity.
• Configure and manage cron jobs on servers.
• Decommission old servers and maintain an inventory of both decommissioned and new servers.

Requirements

• 3 to 5 years of experience as a Linux/Unix System Administrator.
• Strong hands-on experience with Oracle Linux, Red Hat Enterprise Linux, Ubuntu, SUN Solaris, and AIX.
• Experience integrating network services such as NFS, DNS, NTP, Samba, and implementing SFTP servers.
• Proficiency troubleshooting DNS, TCP/IP, SMTP, and SNMP protocols.
• Familiarity with ticketing tools including ServiceNow, BMC Service Desk Express, and Quick Base.
• Ability to write shell scripts using ksh, bash, and perl for automation.
• Solid background in storage management, disk management, multipathing, LVM, and logical partitioning.
• Experience managing user accounts, system security, change management, and performance tuning.
• Knowledge of SSL certificate installation and patch/firmware management.
• Ability to manage multiple tasks independently and collaborate effectively within a team.
• Experience providing on-call support in 24/7 production environments.
• Understanding of security hardening policies and audit compliance.
• Experience integrating Linux environments with Active Directory for Single Sign-On.
• Familiarity with rsyslog, MySQL, and custom repository management.
• Strong skills in system monitoring and documentation.