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Sr. Linux/unix System Administrator Resume

Woodlands, TX

SUMMARY:

  • Over 8 years of experience in IT industry as a Linux/Unix system administrator with of expertise on RHEL 4.x, 5.x, 6.x,7.x, Centos 4.x, 5.x, Suselinux, Oracle Enterprise Linux, AIX, Solaris 8,9,10.
  • Experienced with virtualization using VMware ESX/ESXi environment and AWS .
  • Experienced using configuration tools such as Puppet, Ansible, and Chef.
  • Supported AWS Cloud environment with multiple instances and configured various services of AWS such as EC2, S3, IAM, CloudWatch, SNS, SQS, VPC, etc.
  • Migrated application from physical and Virtual machines to AWS.
  • Installed and managed various client applications in AWS cloud.
  • Experienced in Server monitoring, capacity planning, and application monitoring using Nagios.
  • Worked on day - day tasks; User Administration tasks like adding, deleting and modifying user data and documenting all user data in a centralized location.
  • Experienced in Agile Software Development.
  • Performed tuning of Linux machines in the environment by kernel parameter tuning, identifying process that hogs the system resources and containing them.
  • Experienced with VSTS CI/CD pipelines
  • Experienced in Installing, configuring and maintaining Samba, Apache, Tomcat, Web Sphere & Web Logic Application Servers.
  • Experienced working in customizing the Kickstart and Jumpstart scripts to automate the installation of various servers used for various internal projects.
  • Responsible for Backup and Recovery operations of various servers using VERITAS Net Backup.
  • Working Knowledge on using and developing Shell, Bash and Perl scripts used to automate day-to-day administrative tasks.
  • Experienced on Windows PowerShell task automation and configuration management framework.
  • Worked on configuration of networks, router configuration and wireless security, TCP/IP, VPN, Content Filtering, VLANs, and routing in LAN/WAN, Ethernet Port, Patch Panel and wireless networks.
  • Experienced in Azure Cloud Environment and ARM deployment model.
  • Responsible for OS maintenance activities like upgrading the OS, updating the services and third party software’s.
  • Experience in installation, configuration, management and troubleshooting WebSphere, JBOSS, Tomcat,and LDAP and mail server, HP Automation Servers, HTTP / Apache Web Servers in AIX and LINUX environment for various projects.
  • Worked in maintaining integrity of Linux, Unix servers by performing patching operations on a regular and planned way.
  • Experienced in upgrading Hadoop 1.3 to 2.2 using Ansible.
  • Experienced in Kerbersiation and De-Kerberisation the existing clusters using Ansible.
  • Worked on testing of Linux Environments in the Development/Test Stages to create standardized environment.
  • Documented various maintenance activities and upgrades and changes in the network architecture.
  • Worked with a bug/problem tracking system in responding to DNS requests, updates and tasks and provided 24X7 on call support on rotation basis.
  • Experiences in working on Network team, Performance team, Capacity team, Application team, Database team to resolve issues and also SAN team to discover LUNs.
  • Provide 24/7 on call on routine basis for better support for maintain infrastructure.

TECHNICAL SKILLS:

Operating System: RHEL 4.x/5.x/6.x,7.x, Solaris 8/9/10, HP-UX (10.20, 11.00, 11.11, 11.23), IBM AIX (4.3, 5.1L, 5.3L)

Scripting Languages: Shell, Perl, Bash, Python

Virtualization: VMware ESX 4.x, ESXi 5.x/6.x, AWS (EC2, S3, IAM, Route 53, SNS, SQS, VPC, etc.)

Configuration Management: Chef, Puppet, Ansible

Monitoring and Build Tools: Nagios, Jenkins, Git, Maven

Storage: SAN EMC Symmetrix 800/ DMX1000, 2000 & 3000, EMC CLARiiON 500, 600, 700Databases

MySQL, PostgreSQL, SQLite, DB2, Oracle

Web /Application Server: Apache Tomcat, WebSphere, Web logic

Network Protocols/Services: DNS/Bind, Samba, TCP/IP, NFS, Telnet, DNS, LDAP, SSH, DHCP, NAT, LAN, WAN, ARP/RARP, FTP/SFTP/LFTP/FTPS

PROFESSIONAL EXPERIENCE:

Confidential, Woodlands, TX

Sr. Linux/UNIX System Administrator

Roles & Responsibilities:

  • Administered and maintained RedHat Linux 5.x/6.x7.x, OEL 6.x, Solaris 10, Suselinux Servers by testing, tuning, upgrading and loading patches, troubleshooting both physical and virtual server problems.
  • Utilized VMware Virtual Client 3.5 in creating and cloning Linux Virtual Machines and migrating servers between ESX hosts and building KVM hypervisor.
  • Expertised in setting up and configuring Install Server, Configuration Server and Boot Server using PXE booting for Kickstart process & performed Kickstart to install OS on Linux boxes.
  • Used tool RPM/YUM for installing and updating packages on Red Hat Linux and patching on Solaris servers using Satellite Server
  • Worked on creating file systems on LUNs zoned from SAN Environments which included NetApp V Series.
  • Extensively used of LVM, creating Volume Groups, Logical volumes, and disk mirroring, fixed the problem of Stale and partially mirrored Logical volumes.
  • Worked on troubleshooting network connectivity using ping, netstat, ifconfig, and traceroute commands. Login to the remote system using sudo, putty, and telnet. Transfer files across the systems on the network used ftp, scp and rsync commands.
  • Worked with user administration; startup and shutdown scripts; crontab, file system maintenance, backup scripting and automation using Perl, shell scripting (bash, ksh) for Red Hat Linux systems.
  • Troubleshooting day-to-day server related issues and problems in terms of operating system, applications and network
  • Maintained and monitoring System Activities like CPU, Memory, Disk and Swap space usage to avoid any performance issues
  • Experience in installing, integrating, tuning and troubleshooting Apache and Tomcat application server.
  • Worked with system Software installation and configuration of NFS shares, Auto-Mounter, DHCP and LDAP
  • Configuring, administering and troubleshooting of NFS, AutoFS (Direct and Indirect Maps), NIS (master, slave and client) and DNS in multi-platform networks.
  • Experience in Shell scripting bash to automate system administration jobs
  • Carried out log management process like monitoring as well as rotating log files.
  • Created documentation, reports and presented weekly system status report.
  • Extensively used of LVM, creating Volume Groups, Logical volumes, and disk mirroring, fixed the problem of Stale and partially mirrored Logical volumes.
  • Managed MS windows servers for authenticating LDAP users against Active directory with DNS and DHCP services.
  • Worked with Storage team to configure EMC SAN, NAS configuration.
  • Experience in patching with live upgrade/standard install cluster and applying firmware.
  • Administrated NFS, NIS, DHCP and DNS Samba services running on AIX, Sun Solaris and Red Hat Linux.
  • Experienced in installation, configuration, management, troubleshooting and support of WebSphere, JBOSS, Tomcat Apache Web server and BEA WebLogic application server, LDAP and mail server.
  • Ensured properly secured systems and appropriate policies/monitoring using SELinux , password aging , firewalls/iptables and PAMs .
  • Managed Network troubleshooting applications TCP/IP including Ethernet, IP addressing & Sub netting, routing.
  • Used shell scripting to automate tasks on Solaris and Linux and automated jobs using Crontab.
  • Provided 24x7 on call and remote support for UNIX Production Problems and responding to users' tickets from Remedy.

Environment: RHEL 4/5, IBM AIX 4/5, AIX 4.x, Hitachi 9980v, ESX 4.x, kickstart, usfdumpWeb Sphere, Web Logic, JBoss, Tomcat, DNS, netstat, lookup, DIG, SMTP, MYSQL, RDBMS, Bash

Confidential, Collierville, TN

Sr. Linux/UNIX System Administrator

Roles and Responsibilities:

  • Administered and maintainted RedHat Linux 6.x/7.x, OEL 6.x, Solaris 10 Servers by testing, tuning, upgrading and loading patches, troubleshooting both physical and virtual server problems.
  • Utilized VMware Virtual Client 3.5 in creating and cloning Linux Virtual Machines and migrating servers between ESX hosts and building KVM hypervisor.
  • Expertised in setting up and configuring Install Server, Configuration Server and Boot Server using PXE booting for Kickstart process & performed Kickstart to install OS on Linux boxes.
  • Used tool RPM/YUM for installing and updating packages on Red Hat Linux and patching on Solaris servers using Satellite Server
  • Worked on User administration setup, maintaining account, Monitor system performance.
  • Worked on creating file systems on LUNs zoned from SAN Environments which included NetApp V Series.
  • Extensively used of LVM, creating Volume Groups, Logical volumes, and disk mirroring, fixed the problem of Stale and partially mirrored Logical volumes.
  • Worked on troubleshooting network connectivity using ping, netstat, ifconfig, and traceroute commands. Login to the remote system using sudo, putty, and telnet. Transfer files across the systems on the network used ftp, scp and rsync commands.
  • Worked with user administration; startup and shutdown scripts; crontab, file system maintenance, backup scripting and automation using Perl, shell scripting (bash, ksh) for Red Hat Linux systems .
  • Troubleshooting day-to-day server related issues and problems in terms of operating system, applications and network
  • Maintained and monitoring System Activities like CPU, Memory, Disk and Swap space usage to avoid any performance issues
  • Experience in installing, integrating, tuning and troubleshooting Apache and Tomcat application server.
  • Worked with system Software installation and configuration of NFS shares, Auto-Mounter, DHCP and LDAP
  • Configuring, administering and troubleshooting of NFS, AutoFS (Direct and Indirect Maps), NIS (master, slave and client) and DNS in multi-platform networks.
  • Decommissioned various Virtual and Physical Servers from DNS, DHCP, Isight and Averts.
  • Experience in Shell scripting bash to automate system administration jobs
  • Carried out log management process like monitoring as well as rotating log files.
  • Created documentation, reports and presented weekly system status report.

Environment: RHEL 6/7, Solaris 10, Hitachi 9980v, ESX 6.x, kickstart, Web Sphere, Web Logic, Apache, JBoss, Tomcat, DNS, netstat, lookup, DIG, SMTP, MYSQL, RDBMS, Bash, Shell

Confidential, Lexington, KY

Sr. Linux/UNIX System Engineer

Roles and Responsibilities:

  • Worked on Building, administering, monitoring and troubleshooting RHEL4.x/5.x/6.x, AIX 6.1 on Dev., test and production environment.
  • Deployed Puppet master server by using manifest to configure and manage its existing infrastructure as well as on new client servers.
  • Kicked off Amazon EC2 (AWS) Cloud Servers using AMI's (Linux/Ubuntu) and configured the servers for specified applications.
  • Automated, configured and deployed instances in AWS cloud and worked with Amazon EC2, S3, IAM, ELB, RDS, SNS, SQS etc.
  • Used Ansible on ad-hoc and experience writing Ansible playbook. Setup Ansible environment using ssh key between Ansible server and targets.
  • Deployed scalable mesos cluster in AWS with Ansible and Docker .
  • Manage configuration of Web App and Deploy to AWS cloud server through Ansible
  • Wrote custom Ansible/vagrant scripts to automate building of VM environments for end users.
  • Processing the work request like build and deploying the codes on UAT, Staging, and Production environments.
  • Worked with Storage Area Networks (SAN) that consisted of Hitachi and EMC Storage .
  • Added, removed and resized Logical volumes using LVM in Linux and implementing software RAID at installation time.
  • Raised, handled and closed multiple Change Management and Trouble Management tickets accordingly with Standard.
  • Worked on regular disk management, partitioning per the requirements, creating new file systems or increasing existing ones, managing file systems and adding virtual swap space.
  • Configured kickstart server and patched/updated servers using RedHat Satellite server.
  • Involved in installation, configuration, and administration of RHEL 5, 6 & Solaris 9, 10 using Kickstart, Jumpstart, custom configuration like package management, and volume management of servers.
  • Defined/setup network protocols, Network File Services (NFS), and Network Information Services (NIS) in Linux Environments.
  • Performed and reported daily health checks for multiple application servers.
  • Created VM instances using VMware/ESX on Linux and migrated applications from other servers.
  • Implemented and configured Samba to help with printing and file sharing in the mixed environment.
  • Worked on Maintenance level upgrades and software administration RPM installation on Linux.
  • Conducted Annual Disaster Recovery exercises for applications on different platforms.
  • Worked on Scripting and task automation by Crontab using Bash, and Korn shell scripting.
  • Created Bash Shell scripts to monitor system resources and system maintenance.
  • Performed administrative tasks such as System start-up/shutdown, and Backup strategy and scheduled cron jobs for job automation.
  • Performed O/S and kernel upgrades on Linux servers.
  • Performed host based SAN migration on Standalone and Cluster Linux servers.
  • Troubleshoot backup issues, performed manual backups & restore using VERITAS Net Backup.
  • Documented and maintained the inventory using asset management techniques.
  • Provided support for servers on 24x7 rotation bases on different platforms.

Environment: RHEL4.x/5.x/6.x, AIX 6.1, HP BL460, DL 380 Dell and IBM X Series, SAN, LVM, RPM, Tivoli End Point, BMC patrol, WebSphere, VERITAS Net Backup, Puppet, Ansible, Shell and Perl Scripting, BMC Remedy 8.1, 8.1.0x, etc.

Confidential, State College, PA

Linux/UNIX Administrator/Engineer

Roles and Responsibilities:

  • Installed and configured RHEL 4.x, 5.x, 6.x and Solaris 9/10.
  • Experienced in administration, Deployment, Automation of configuration management tool using Chef .
  • Used OpenStack and AWS cloud services to launch Linux and windows machines, created security groups.
  • Proposed solutions, and migration plan; worked with stakeholders to validate/accept, and wrote the automation to migrate hosts from ESX, existing OpenStack clusters, and AWS.
  • Extensive experience working on performance monitoring with SAR, iostat, vmstat, mpstatetc.
  • Worked on Disk Space management using VERITAS Volume Manager.
  • Installed VMware ESX server on Dell Servers and configured Red Hat Linux 5.x, 6.x virtual machines for various applications.
  • Involved in configuration of Hardware and Software RAID, Disk replacement and File system recovery. Implemented Virtualization using VMware.
  • Installed and upgraded Redhat Linux, firmware, failed hardware and system support software Dell PowerEdge Servers.
  • Created Servers, User mappings and Nicknames to access DB2 and Oracle databases.
  • Installation of software packages and checking the integrity of the installed packages. Installed different RPM Linux 4.0/5.0.
  • Administered Linux servers for several functions including managing Apache/Tomcat server, mail server, MySQL database, and firewalls in both development and production
  • Set up printers on UNIX / NT machines to work seamlessly across platforms.
  • Configured and administered firewall rules to effectively monitor system files, port security, and network traffic activity coming through the firewall.
  • Implemented OpenLDAP in enterprise environment, created user mailboxes, modified various user attributes in LDAP/LDIF.
  • Involved in Deployment of latest patches for Sun, Linux and Application servers to keep infrastructure up to date.
  • Installed and configured Sudoers file to provide access the root privileges to users using visudo cmd.
  • Extensively worked on troubleshooting critical hardware and software issues and other day-to-day user trouble tickets; maintaining email servers as well as Installing and setting up Oracle9i on Linux for the development team.
  • Responsible for backup of all servers, and recovery of servers.
  • Managed Cronjobs, batch processing and job scheduling routinely.
  • Supported and in-depth troubleshooting of Linux/Unix systems 24 x 7 Environment

Environment: RHEL, Solaris, OpenStack, AWS, Chef, LDAP, VMware, Oracle, DB2, etc.

Confidential, Bentonville, AR

System Administrator (Linux/Unix)

Roles and Responsibilities:

  • Installation, Configuration and upgrade ofRedhatLinux (4.x, 5.x), SUSE, Solaris and HP-UX Operating Systems.
  • User Administration, management and archiving.
  • Configuring NFS, NIS, NIS+, DNS, Auto Mount & Disk Space Management on Linux SUN Servers .
  • Monthly security patches deployment on 200+ Linux test and production servers.
  • Configured volume groups and logical volumes, extended logical volumes for file system growth needs using Logical Volume Manager (LVM) commands.
  • Expertise in performing firmware and operating system patching.
  • Responsible for building / maintaining a production environment
  • Checked and done the patch upgrade and Firmware upgrade for each migration server as and when required.
  • Experience in Configuring and Managing Virtual Disks, Disk Mirrors &RAID Levels.
  • Worked with NAS Storage with HBA card configuration.
  • Cloud computing: Worked with OVF "Open Virtual Machine Format" supported tools Virtual Box, Redhat Virtualization (XEN), and VMware Workstation.
  • Excellent Knowledge in Capacity Planning and Performance tuning.
  • Activities include user administration, startup and shutdown scripts, crontab, file system maintenance and backup scripting and automation using shell scripting (BASH, KSH) and Perl for Redhat Linux systems
  • Experience with VMware Virtualization using ESX hypervisor of VSphere 4.0.
  • Installation, Configuration and Maintenance of Samba, Apache Tomcat, Web Sphere and JBoss servers in AIX, and Linux environment.
  • Configured and utilized Puppet automation tool using manifest to manage and update an existing as well as new nodes.
  • Setting up JBoss cluster and configuring apache with JBoss on Redhat Linux. Proxy serving with Apache. Troubleshooting Apache with JBoss and Mod jk troubleshooting for the clients.
  • Installed Oracle, Dev framework, JBoss and several other policies on several production servers Via HPSA.
  • Experience with setting up Linux servers for Oracle Real Application Clusters and configuring SAN based devices for raw and File system mount points.
  • Troubleshooting and analysis of hardware and software failures for Redhat Servers, Backup Servers and work with different vendors (HP, EMC, Oracle, Redhat) to resolve the issue.
  • Extensively worked on Installation of Single-Server and Distributed IBM Filenet P8 Platform System.
  • Scheduled run jobs in Autosys, at, and crontab . Analyst productions and support over 100 users. Maintain disk space, delete core file and clean old files system every month end.

Environment: Redhat (2,3,4,5), VMware ESX 4.x and SUSE Linux, Solaris 8 / 9 / 10, IBM Filenet P8, IBM RS/6000, pSeries Server, NetBackup 5.0, Veritas Volume Manager 4.x/5.0, SAN EMC Clariion CX 700/ CX 600/ CX 500, EMC DMC

2000/ 3000

Confidential, Austin, TX

Linux/UNIX Administrator

Roles and Responsibilities:

  • Extensively worked on Installation, Configuration & Upgrade of linux, AIX, HP-UX etc.
  • Managed Users for AIX and Linux Servers and assigned rights to access network resources
  • Creating virtual machines using Xen hypervisor on Xen servers, installing Redhat, CentOS using kickstart.
  • Expertise in creating and managing Logical Volume Manager in AIX, HP-UX andRedhat Linux.
  • Server Consolidation and Migration of Applications on Oracle Enterprise and Java Applications.
  • Experience in building Production Servers and validation for new build releases.
  • Experienced in Monitoring system Access and Monitoring servers by using tools like Tivoli, HP Openview and Nagios.
  • Configured and maintained Sendmail,postfix for securing the mail servers.
  • Expertise in Volume management, Disk Management, software RAID solutions using Veritas Volume manager
  • Creating File System, managing & checking data consistencyof the File System.
  • Setup and configureVeritasNetBackup 5.x, 6.x and 6.5x Net Backup server / client & tape libraries.
  • Troubleshooting hardware, software and operating system related errors on Linux including Hardware Maintenance and Upgradation.
  • Installation of Packages and Patches for AIX, Solaris 8/9/10, Redhat Linux 4/5, HP 11.X.
  • Disk and file system management through Veritas Volume Manager / Veritas File System and Solstice Disk Suite .
  • Experience with VMware Virtualization using ESX hypervisor of VSphere 4.0.
  • Performance monitoring and Tuning using top, prstat, sar, vmstat, ps, iostat etc.
  • Configuration of VERITAS Cluster Server, Service Guard from the scratch and maintained service group/packages for failover and redundancy purpose.
  • Configured and maintained network services such as LDAP, DNS, NIS, NFS, Web, Mail, FTP .

Environment: Redhat Linux, Solaris 9/8/10, HP-UX 11.0, VMware ESX 4.x, Ultra Enterprise 2/1 Servers, SPARC server 1000, SPARC server 20 Enterprise Servers, SPARC server 1000/20

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