SUMMARY

• 7 years of IT experience as UNIX System Administrator in a diverse, distributed and networked multi - node Linux environments or server farms.
• Experienced in Managing and administrating all UNIX servers, including Linux operating systems (RHEL, SLSE) by applying relative patches and packages at regular maintenance periods using Red Hat Satellite server, YUM, RPM tools.
• In-depth experience administering VMware infrastructure, including ESX 4.x and 5.x, vCenter, vSphere 5.x and associated VMware products. Creation of VMs, cloning and migrations of the Virtual Machines on VMware vSphere.
• Experienced in Installation of Operating Systems, Packages and Patches,
• Maintaining user accounts, System Security maintenance, backup/recovery, performance tuning, troubleshooting at various levels etc.
• Experience with Kickstart installation in Red Hat Linux, setting up PXE boot environment in Red Hat Linux.
• Experience in TCP/IP configuration and network setup, DHCP, Bonding and other network technology.
• Users and group administration as well as disk quota management.
• Working knowledge on Logical Volume Management (LVM). Creating new Volume Group or extending existing ones, creating new file systems, mounting and unmounting file systems.
• Experience in administering of monitoring tools such as Webmin and Nagios 3.0,4.0.
• Worked on DNS servers from installing BIND9 package, updating the BIND database and troubleshooting the problems.
• Experience in Installation and monitoring of server hardware, operating system and application patch level, disk space and memory usage, user activities on daily basis.
• Experienced in setting up CRON jobs scripts on production servers.
• Experience in backup and restore database and Operating system.
• Experience in writing / modifying shell scripts for process automation of systems, applications, backups etc.
• Experienced with discussing the performance issues, network related issue on Linux / Unix Servers and with vendors for hardware related issues.
• Experience in providing first level of Support to Oracle databases and Web applications and creating the runbook to solve the repetitive problems on UNIX environment
• Experienced in configuration and administration of LDAP, NFS and NIS.
• Experienced in Installation, configuration, and customization of services Sendmail, Apache Tomcat 7 8, FTP and VNC servers to meet the user needs and requirements.
• Proficient in installation of Packages, Patches and maintenance & RPM updates on Linux.
• Working with the NOC team for 24x7 uptime of the system and staying on call on rotation basis.
• Experienced in troubleshooting and resolving network issues related to the servers.
• Implemented Security Hardening per company policy using UNIX features.
• Experienced in Implementations of automatic secure SSH Login, User and Group administration.
• Experienced in Samba implementation for sharing of resources between Linux and Windows environments.
• Experienced in Windows Server installation and basic configuration
• Very strong interpersonal, customer service, result oriented and team building skills.
• Excellent communication skills - written, verbal, and presentation

TECHNICAL SKILLS

Operating Systems: Red Hat Linux 8,9,10, RHEL 4.x,5.x,6.x, SLES 10,11, Windows 2000/2003/2008/ XP/Vista/07, VMware, Vsphere, ESX 4.x,5.x.

Tools: Logical Volume Manger, Veritas Cluster, FTP, SSL, VMware Virtualization, VMware ESX, RAID Technologies.

Scripting Languages: Shell Scripting, Bash, Ksh, Perl

Networking: DNS, NIS, sendmail, DHCP, NFS, FTP, AutoFS, Samba.

Storage: IBM DS4700, IBM DS5020, NAS, SAN using EMC and Hitachi storage.

Web tools: Apache, Netscape, Web Logic, JBoss

Database: Oracle (9i, 10g, 11g) with RAC and Dataguard, DB2/UDB 7/8.

Hardware: Confidential PowerEdge (1650,2850,2950,6400), EMC Symmetrix, Hitachi arrays, Backup Devices, Ethernet Hubs, Routers, Repeaters, Jukebox, Printers Confidential Blade Servers R220, R320, SAN, NAS Storage Box, SAN Switch DAT 72 Tape

PROFESSIONAL EXPERIENCE

Confidential, DALLAS, TX

Linux System Administrator

RESPONSIBILITIES:

• , Configuration and upgrading of RHEL5X, RHEL6X and SUSE 11, 12.
• Installation Configuration of LVM (Logical Volume Manager) to manage volume group, logical and physical partitions.
• Documented the standard procedure for installation and deployment of logical volume manager.
• Installation, configuration and support of DHCP, SSH, SCP, FTP, DNS services.
• Configuration and administration of NFS and Samba.
• Maintained and monitored all of company server operating system and application patch level, disk space and memory usage, user activities on day-to-day basis.
• User administration on RHEL systems, SUSE Linux, HP-UX machines, management & archiving.
• Installed and Configured Multiple OS using VMware ESXi on IBM, Confidential servers.
• Monitored daily backups and maintained offsite backup for recovery in case of a system crash.
• Configured networking services and protocols such as DNS, SSH, DHCP, TCP/IP Attended calls related to customer queries and complaints, offered solutions to them.
• Worked with monitoring tools such as Nagios 3.0.
• Creation of VMs, cloning and migrations of the VMs on VMware vSphere 4.0.
• Worked with DBA team for database performance issues, network related issue on Linux / Unix Servers and with vendors for hardware related issues.
• Expanded file system using Logical Volume Manager.
• Managed and upgraded UNIX’s server services such as Bind DNS.
• Configuration and administration of Web (Apache), DHCP and FTP Servers in Linux and Solaris servers.
• Supported the backup environments running VERITAS Net Backup 6.5.
• Responsible for setting cron jobs on the servers
• Decommissioning of the old servers and keeping track or decommissioned and new servers using inventory list.
• Handling problems or requirements as per the ticket (Request Tracker) created.Participated in on-call rotation to provide 24X7 technical supports.

Environment: Red Hat Enterprise Linux 4.x, 5.x,6x, SuSE Enterprise Linux 10,11, VERITAS Volume Manager, Oracle 11G, Samba, EMC Power path, Confidential PowerEdge 6650, HP Proliant DL 385, 585, 580.

Confidential, DALLAS, TX

Linux System Administrator

RESPONSIBILITIES:

• Managed and administrated of all UNIX servers, includes Linux operating systems by applying relative patches and packages at regular maintenance periods using Red Hat Satellite server, YUM, RPM tools.
• Planned and performed the upgrades to Linux (RHEL 4x, 5x, 6x, SUSE 9, 10, 11, CENTOS 5, 6) operating systems and hardware maintenance like changing memory modules, disk devices, SAS, SATA & SCSI devices.
• Extensively worked with the LAN/WAN, firewalls and routing for Internet and Intranet connectivity using different protocols like TCP/IP, UDP, DHCP, HTTP/s, FTP, SMTP & SSH.
• Handling all NFS, Auto Mount, DNS, LDAP related issues.
• Monitoring CPU, memory, physical disk, Hardware and Software RAID, multipath, file systems, network using the tools NAGIOS 4.0 monitoring.
• Install new / rebuild existing servers and configure hardware, peripherals, services, settings, directories, network, storage in accordance with standards and project/operational requirements
• Trouble shooting cluster related problems by checking log files and using cluster commands.
• Performing failover and integrity test on new servers before rolling out to production.
• Performed Kick start installations in Linux.
• Writing Shell and Perl scripts for automation of daily tasks, documenting the changes that happen in the environment and in each server, analyzing the error logs, analyzing the User logs, analyzing the /var/adm/messages.
• Planned, scheduled and Implemented OS patches on Linux boxes as a part of proactive maintenance and Secure Shell (SSH) implementation.
• Installed and configured Red Hat 5.0/6.0 on Confidential Power Edge server.
• Installed VMware ESX server on Confidential Servers and configured SUSE 11, 12, Red Hat Linux 5.0, 6.0 / Windows virtual machines for various applications.
• Installation of software packages and checking the verification of installed packages.
• Failover/Failback RPM packages while adding storage on a two or three node Oracle 10g RAC Cluster.
• Resolving critical problems, performing root cause analysis, document solutions and provide preventive Measures.
• Installation, configuration, and customization of services Sendmail, Apache, FTP servers to meet the user needs and requirements.
• Extensively used IDM (Identity Manager) to synchronize user’s accounts, group accounts and also password synchronization.
• Performing kernel and database configuration optimization such that it limits I/O resource utilization on disks.

Environment: Red Hat Linux 4.x, 5.x, Oracle 10g, Samba, Autosys, VMware vSphere 4.0,VMware ESX 3.5.0,VMware ESX 4.0.0, Storage Manager,F5 load balancer, Confidential PowerEdge (1650,2850,2950,6400).

Confidential, Phoenix AZ

Linux Administrator

Responsibilities:

• Involved in the design, implementation, availability and performance of Red Hat Enterprise Linux 4.x, 5.x environments in the company.
• Cooperate with other technical teams to implement overall technical infrastructures supporting enterprise-wide systems with direct responsibility for Red Hat Enterprise Linux servers
• Configuring distributed file systems and administering NFS server and NFS clients and editing auto-mounting mapping as per system user requirements.
• Designed and implemented an automated system installation and configuration system, based on Linux Kickstart builds for common server configurations
• Reviewing system log files for errors.
• Setting up cron jobs for backups and monitoring processes
• Installed VMWare ESX on Confidential Servers and configured Red Hat Linux 4.x, 5.x and Windows OS virtual machines for various applications.
• Configured and maintained NIS and DNS database. And wrote Bash shell scripts.
• NFS file systems and shared them to clients.
• Managing Network Time Protocol Server NTP.
• Implementation, Configuration and support of SENDMAIL-RELAY Server.
• Implementation, Configuration and support of Apache, FTP, NIS, DNS, Samba and VNC Server.
• User and group administration, adding new users deleting the existing users, password expiry and password reset.
• File system administration and monitoring of the systems.
• LVM management and monitoring
• LUN mapping and configuration
• Different RAID level implementation and monitoring.
• Performed system administration of UNIX servers by using Operating Systems of RHEL 4.x, 5.x.
• Installation of patches and other software packages
• SAN Experience:experience designing and implementing storage for optimal performance.Experience should include setting up the storage to dynamically allocate/de-allocate disk from systems.Must have a thorough understanding of multi-pathing and RAID technologies.
• Installation of Oracle Patches and Troubleshooting, Creating and modifying application related objects, Creating Profiles, Users, Roles and maintaining system security.
• Configuration and maintenance of NIS, NFS, DHCP and DNS Servers on RHEL 5.0.
• Administrative tasks such as System Startup/shutdown, Backup strategy, Printing, Documentation, User Management, Security, Network management, dumb terminals and devices carried out.
• Installation and configuration of Oracle 7.x/8.x requisite parameters
• Performed the administration of the Domain Name Server and configuration of the Database Files.
• Troubleshooting Backup and Restore problems and performed Day-to-Day trouble shooting for the end users on Solaris based applications.
• Performed OS upgrades and Patch loading as and when required.
• Backing up and restoring files across the network
• Responsible for Installation of various software components on several servers.
• Installed and Configured Sendmail Utility on Sun UNIX Servers.
• Troubleshooting Backup and Restore problems

Environment: Red-Hat Linux Enterprise servers (HP Proliant DL 585, BL 465/485,ML Series, SAN(Netapp), BladeLogic, Veritas Cluster Server 5.0, Windows 2003 server, Shell programming, Jboss 4.2, JDK 1.5,1.6,, VMware Virtual Client 3.5, VMware Insfrastructure 3.5.

Confidential, Austin, TX

Linux Administrator

Responsibilities:

• Installed configured and Administered Linux and UNIX servers.
• Installed and configured Red Hat Linux Kickstart services.
• Configuration of NIS, NFS, AutoFS on a Unix Systems
• System and Network Administration training, which include but is not limited to installing UNIX internals, NFS/NIS management, and DNS Configuration
• Handled System tuning, log maintenance, disk space management etc
• Wrote shell scripts for automated installations, to extract logs.
• Installed and configured J2EE Application servers on Windows and Unix environments
• Performance monitoring with Sar, Iostat, VMstat, MPstat, Top and Other Tools.
• Took Unix native backups and restore using ufsdump, ufsrestore & tar commands
• Network Monitoring Using Nagios tool
• Network trouble shooting using ‘ndd’, 'traceroute', 'netstat', 'ifconfig' and 'snoop' etc
• Installed and configured Sudo for users to access the root privileges.
• Experienced in Troubleshooting critical hardware and software issues and other day-to-day user trouble tickets
• Experience in Servers consolidation and virtualization using VMware virtual infrastructure, VMware ESX, VMware Vcenter.
• Developed automated processes that run daily to check disk usage and perform clean-up of file systems on UNIX environments using shell scripting and CRON.
• Installation and configuration of UNIX servers.
• Maintained maximum uptime and maximum performance capacity for Enterprise Production, QA, UAT /Staging.
• Monitoring CPU, memory, SCSI disks, disk controllers, physical disk, Hardware and Softeare RAID, multipath, file systems, network using the tools NAGIOS Tools.
• Planned, scheduled and Implemented OS patches on Linux boxes as a part of proactive maintenance.
• Veritas Net Backup on Sun Severs and performing Backup using Veritas Net Backup.
• Sudo administration and Red HatLinux package administration using rpm and YUM.
• Extensive use of Veritas Volume Manager for Disk management, file system management on UNIX environment.
• Use of Korn shell and Bash for scripting.
• Expertise in Red Hat Linux backup/restore with tar including disk partitioning and formatting.
• Working knowledge of VMware (Virtualization).
• Involved in development, user acceptance, performance testing, production & disaster recovery server.
• Worked with other IT teams, customers (users), and other managers in helping build and implement systems and standards.

Environment: Red Hat Linux (RHEL 4/5), Logical Volume Manager, Veritas Cluster Server, Global File System, Red Hat Cluster Servers, Oracle, mysql, Veritas Volume Manager, Veritas Net backup, Ksh/Perl programming, DNS, NIS, NFS, Apache, Tomcat, CA IT Client Manager (CA ITCM), CA Patch Manager, CA Service Desk Manager, Varnish servers 2.1.4, 2.1.5,windows server 2000,2003, 2008, VMware ESX 2.x,HP-UX.

Confidential

Linux System Administrator

Responsibilities:

• Involved in design, configuration, installation, implementation, management, maintain and support for the Corporate Linux servers RHEL 4x, 5.x, SLES 9, CENTOS 5.x.
• Installation of patches and packages using RPM and YUM in Red hat Linux.
• Created and modified application related objects, created Profiles, users, roles and maintained system security.
• Responsible for setting up cron jobs scripts on production servers.
• Installed and configured SAMBA server for Windows and Linux connectivity.
• Monitored System Activities like CPU, Memory, Disk and Swap space usage to avoid any performance issues.
• Responsible for writing/modifying scripts using sh, ksh, and bash for day-to-day administration.
• Modified Kernel parameters to improve the server performance in Linux.
• Installed and configured Apache / Tomcat web server.
• Creation of Logical volumes (LVM) for Linux operating systems.
• Coordinating with 24 x 7 on-call support personnel in debugging.
• Maintained proper documentation of all the activities carried out during the project
• Worked with DBA team for database performance issues, network related issues on Linux Servers.
• Created and modified users and groups with SUDO permission.
• Installed and configured VNC server/client.
• Coordinating users for any server activities which may involve major changes on software or any hardware related issues.
• Maintained proper documentation of all the activities carried out during the project.

Environment: Red Hat Linux (RHEL 4/5), Logical Volume Manager, Global File System, Red Hat Cluster Servers, Oracle, mysql, Veritas Volume Manager, Veritas Net backup, DNS, NIS, NFS, Apache, Tomcat.