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Linux/ Unix Administrator Resume

Austin, TX

SUMMARY:

  • Close to 7 years of experience as UNIX System Administrator in Red Hat Enterprise Linux, Fedora, Ubuntu, CentOS, and Confidential - AIX.
  • Planning, Installation, and Configuration of Red hat Linux 4x, 5x, 6x and Confidential AIX 5.x.6.x,7.1 along with installation and configuration of kickstart.
  • Configured server hardware and performed kernel tuning based on the applications to be installed and the number of users.
  • Experienced in deploying RHEL 6x, 5x in an enterprise setting.
  • Proficient in IBMHardware Management Console to build and partition the IBMp5 and p5+ servers and performed NIM Installations on LPAR.
  • Installed and configuration ZFS on test environment servers.
  • Accomplished Disk Mirrors and RAID 0, 1 and 5 levels on several UNIX and Linux servers.
  • Monitoring and troubleshooting Servers using various third party tools like Nagios, Big Brother, Tivoli, Conky, and Nmon.
  • Efficiency in installing, configuring and implementing the RAID technologies using Veritas Volume manager and Solaris Volume manager.
  • Highly experienced in Installing, Configuring, and Implementing Virtualization Environment Using VMware (Server and Desktop software), Sun Virtual Box, and Microsoft Virtual PC.
  • Provide and reviewed technical support for technical documentation of UNIX server builds and helped in disaster recovery operations.
  • Administering and Configuring NFS, DNS, NIS, NIS+ and LDAP on Sun Solaris server environment
  • Knowledgeable about basic scripting written in Korn, Bash, and C shell to automate tasks.
  • Experienced in setting up a PXE boot environment with SuSE, and Red Hat Linux.
  • Expertised in Veritas Volume manager (VxVM), creating new file systems, mounting file systems and unmounting file systems.
  • Extensive experience in Installation, Configuration and Troubleshooting of various web server issues including Netscape Enterprise Server 4.0, Confidential http server, Apache Web Server 2.x/1.x, Tomcat 5.x/4.x/3.x.
  • Configured Network Concepts DNS, NIS and DHCP, troubleshooting network problems such as TCP/IP, providing support for users in solving their problems.
  • Good knowledge on virtualization implementations such as VM Ware and Xen on Redhat.
  • Server Consolidation and Migration of Applications on Oracle and Java Applications.
  • Expertise in implementation and maintenance of DHCP, NFS, NIS, DNS and Apache SMTP.
  • Experience in using Veritas Net Backup, Proficient in system backup and recovery from tapes using ufsdump, ufsrestore, tar and cpio, file system administration.
  • Experience with system analysis, troubleshooting and performance tuning of operating systems.
  • Experienced in supporting database systems including Oracle, MySQL, PostgreSQL on Red Hat Linux/Unix
  • Good experience in Red Hat Linux Performance Monitoring tools using vmstat, iostat, prstat, mpstat, sar & top.

TECHNICAL SKILLS:

Web Severs: Apache 2.x/1.x, Confidential Http Server, Tomcat 5.x/4.x/3.x.

Operating Systems: Red Hat Linux 4.x/5.x/6.1, Confidential AIX5.x, 6.x,7.1, Sun Solaris 8, 9, 10 SUSE Linux 9, 10.

Web/Application Servers: Web Logic 7.0/8.1/9.x/10.x, JBOSS, Tomcat, Web sphere 5.x/6.x, HTML, JavaScript, XML, EJB, Servlets

Software: Veritas File System, Veritas Volume Manager, Solistice Disk Suite 4.x., Veritas Net Backup, Samba, Tivoli(TSM).

Tape Hardware: Storage tek tape libraries L40, L80, L180, L700.Sl500, Sl850, DAT&DLT, STK 9940B, LTOs.

Hardware: Confidential F-Series & P-Series, Confidential RS6000, Sun Storage Array D1000, A5000Series, Workstations 700 series, Dell Power Edge 1300/1500/6650/2650/2950 Servers.

Scripting Languages: Born, Bash, KSH, Perl

Networking: TCP/IP, NIS, NFS, DHCP, DNS,WAN, SMTP, Cisco Routers/Switches, TELNET, FTP/TFTP, SNMP,LDAP

PROFESSIONAL EXPERIENCE:

Confidential, Austin, TX

LINUX/ UNIX Administrator

Responsibilities:

  • Extensively worked on installation, configuration and maintenance of RHEL, SLES, CentOS, UBUNTU, AIX on development, test and production servers.
  • Implemented day-to-day tasks in Redhat Linux 6.x, 5.x, 4.x including user access, setting up sudo rules upgrading kernel, firmware, rpms, HBA drivers, as well as adding SAN disks.
  • Offer daily monitoring (7 X 24 X 365) of hardware, OS, critical server processes, and other system software services such as: backup, file transfer, NTP, etc.
  • Worked on PXE boot, DHCP configurations as well as OS, patches and other software installations with HPSA v. 7.88 automation tools.
  • Worked with VMware Vsphere Client V 4.1.0 to build, support and maintain virtual servers.
  • Implemented virtualization using VMware in Linux on HP-DL585 and Confidential z/Vm series
  • Configuration and Installation of DHCP, DNS (BIND,MS), web (Apache,IIS), mail (SMTP,IMAP,POP3), and file servers on Linux servers.
  • Created users, manage quotas, and setup user permissions in Redhat Linux 5.x, 6.x.
  • Collaborate on Monitoring and troubleshooting Servers using various third party tools like Nagios,
  • Built and supported Weblogic 10.3.2 and 10.3.5, Webserver (Apache 2.2.17), JBoss 6.0, JMS 2.4.3 VMs and physicals in both testing and production environment.
  • Created new File Systems and Logical Volumes, performed file system management & troubleshooting; file system Installation & administration; performed basic file system & directory changes (creation/permissions), disk & file system cleanups in Redhat 5.x, 6.x.
  • Booted systems into different run levels for troubleshooting and system maintenance
  • Network troubleshooting using ndd, traceroute, netstat, ifconfig, and snoop etc.
  • Worked with DBAs on installation of RDBMS database, restoration and log generation
  • Worked on decommission of legacy servers including removal of DNS entries VCS, Weblogic and other applications.
  • Developed Korn and Bash shell scripts as well as cron to automate routine activities
  • Used RCS (Revision Control system) to manage retrieval of frequently accessed files.
  • Worked with Veritas Netbackup 6.5 for enterprise wide backup and recovery.

ENVIRONMENT: Redhat Linux AS, ES 5.x, 6.x, VMware Vsphere Client v 4.10, HP Server Automation v 7.88, Best Practical RT system v 3.8.2, DHCP, DNS, Weblogic 10.x and Apache 2.x, JBoss 6.0, JMS 2.4.3, HP DL380G8, Veritas Cluster, ILO, Veritas Netbackup 6.5

Confidential, Dallas, TX

System Administrator

Responsibilities:

  • Responsible for installation (using kickstart), configuration and administration of RedHat Enterprise Linux4.x/5.x and RHEL 6 at other data center over network.
  • Administered and maintained RedHat 4.x/5.x/6.x, troubleshoot hardware, operating system, applications & network problems and performance issues.
  • Responsible for Patching (both Operating System and Application Server)
  • Installed and configured DHCP, DNS (BIND, MS), web (Apache, IIS), mail (SMTP, IMAP, POP3), and file servers on AIX and Linux servers
  • Installed and Configured Samba (CIFS) to help printing and file sharing in the mixed Environment
  • Installed WebLogic 9i/10.3 and configured Domains, Admin and managed servers for Applications to be deployed.
  • Database Migration from Windows 2000 to Linux
  • Responsible for installing, configuring and troubleshooting Web Server (Apache) and JBoss
  • Setup and maintained NFS, NIS, and TCP/IP network, configured the systems for TCP/IP Networking with the existing LAN, setting up SSH and SCP features
  • Implemented virtualization using VMware in Linux.
  • Performed Kernel Tuning (for Oracle installation), memory upgrades and RedHat Linux Kickstart installations
  • Provided support for multi-path Fiber Channel storage systems, configured with multiple Fiber Channel (FC) Host Bus Adapters (HBA) on a Storage Area Network (SAN).
  • Implemented day-to-day tasks in RedHat Linux that include upgrading rpms, kernel, HBA driver, configuring SAN Disks, multipathing and LVM file system.
  • Configured Firewall and security using SSL, IPtables, TCP Wrappers, SELinux Tripwire, and port scanners.
  • Performed System Backup using tar, cpio for local systems and Veritas NetBackup for enterprise wide backup and recovery
  • Troubleshooting Network issues using ‘ndd’, 'traceroute', 'netstat', 'ifconfig' and 'snoop' etc
  • Automated routine activities and scheduled events using shell-scripts (korn and bash) and cron job.

Environment: RedHat Linux 4.0,5.0 AS ES, AIX 5.1,5.2,5.3, Veritas Netbackup, SAN Storage, 4.5.5, Confidential -z/VM, Oracle 9i/10g, Samba, Windows 2000/2003/2008 Server, Web Logic 9i/10.3, VMware ESX 2.x,, Tomcat, Apache Server 2.x

Confidential, Dallas, TX

UNIX Administrator

Responsibilities:

  • Installed, Configured and Supported RHEL 4.6/5.X.
  • Worked with installation and configuration of VMware ESX servers
  • Deploying and maintaining of the Virtual Machines.
  • Configuring Lights Out Management (LOM) for Remote Access
  • Successfully implemented Kickstart-PXE for the First time in the environment
  • Associated with DBAs for installation of Oracle database (RAC) on Linux servers & for tuning, backup and restore
  • Configured Multipath for SAN
  • Configured IP Bonding for Failover Load balancing
  • Scripts written in BASH for the Automation of Post-Build Steps and Basic Hardening
  • Performed Datacenter infrastructure maintenance including racking, cabling and troubleshooting.
  • Designed and implemented Virtual infrastructure 3 (10 ESX Servers, 50VM’s)
  • Conducted troubleshooting, Patching, Upgrades and Back-ups when required
  • Worked on Data Migration from EMC to Netapp
  • Storage Migration in VMware ESX server using VMotion
  • Prepared a standard RUN BOOK for each migration methodology used for migrating Linux/Unix servers.
  • Checked and did Patch upgrade and Firmware Upgrade for each migration server when required.
  • Installed and configured Multipath and removed Powerpath in all the servers.
  • Copy of data outside the realm of NetApp’s tool copies, i.e. set up any necessary Mirroring.
  • Ensured that the new devices from Netapp are made online and configured on Linux file system.
  • Ensured the data is copied by Netapp team and data is 100% integrity and checked for no slippage.
  • Provided post data migration support for all incidents related to end user access and directory access privileges until final cutover.

Environment: -Solaris 9, 10, Veritas Volume Manager 4.1, Veritas NetBackup 5.0, Confidential WebSphere 6.1, ZFS. Sun Solaris 8/9,Redhat Linux 4/5,AIX 5.3L,Windows,Veritas Volume Manager, Veritas Net backup, Ksh/Perl programming, DNS, NIS, NFS, Apache, Tomcat, Oracle 10g.

Confidential, Atlanta, GA

UNIX Administrator

Responsibilities:

  • Performed RedHat Linux and Confidential AIX OS Installations on new hardware through native and TPM tools.
  • Creating and administering users File System and user accounts on RedHat Linux servers.
  • Systems monitoring and administration of RHEL 5.x and AIX 5.6 and 6.1 Servers for day-to-day problems in production environment and solved tickets on shift basis.
  • Installation, Maintenance and Configuration of Computational Servers with corresponding and associated software on RedHat Linux and AIX Servers.
  • Planning, managing and Installation VMware ESX 3.5 /4.0 server, Installation and configuration of virtual center database and installation of VMware infrastructure virtual machine.
  • Performing Snapshots, Cloning, Migration VM ware convertor, Virtual Infrastructure client.
  • Performed LUN management, metaluns, RAID groups, storage groups.
  • Worked on SAN management software and provided SAN administration for Clariion boxes.
  • Installed patches, software up gradation, monitored log files, and performed backup for Linux servers as well as Confidential AIX servers.
  • On-site support and issue resolution of administrators and developers for Linux, Iaas (open stack/cloud computing platforms) and configuration management tools (puppet).
  • Actively participated in the automation effort. Utilized Puppet to automate single-command provisioning across various environments for homogenous environment across an application.
  • Planning, installing and configuration of operating system on new AIX as well as RHEL Servers.
  • Involved in Confidential AIX OS upgrade from AIX 5.6 to 6.1 LPARs and VIO clients on a large scale.
  • Actively supported oracle ASM clusters on Confidential AIX LPARS.
  • Involved in OS migration from Sun Solaris to RHEL and Confidential AIX.
  • Installation & Configuration of Logical Volume Manager - LVM and Veritas Volume Manager on RedHat Linux Hardware.
  • Involved in creation and maintenance of raw disks and volumes for databases.
  • Patching of Confidential AIX servers using NIM.
  • Used the NIM OS image or mksysb image to get the maintenance done and bring the server back up.
  • Adding/expanding new storage to existing/new systems using VERITAS Volume Manager and Solaris Volume manager.
  • Involved in SAN migration from legacy storage systems to new environment using native volume groups as well as veritas volume manager in Confidential AIX and Sun Solaris servers respectively.
  • Collecting and analyzing EMCgrab across various platforms and prepare documents like host worksheet, migration task list and host procedure documentation required for Data Migration/Fabric Migration.
  • Applying new patches and packages for AIX, Solaris and RedHat Linux.
  • Installation and Configuration of Oracle10i and MySQL on RedHat Linux 5.x and Confidential AIX.
  • Providing day-to-day user administration like adding or deleting users, password aging.
  • Troubleshooting Sun Solaris problems, logging call with Sun, Involvement in Racking servers.
  • Configured virtual IPs in Linux and Solaris.
  • Interacting with various teams such as Oracle database, Net-backup and SAN teams.
  • Installed i planet web server on Linux Servers.
  • Configured VMware and installed several Linux and Windows Operating Systems according to the client needs. Also involved in maintenance and Troubleshooting of VMware.
  • Implementation and Management of Disk Quota on Linux and Solaris Servers.
  • Installation configuration and Administration of sendmail on Linux and AIX servers.

Environment: Redhat Linux 4.x,5.x,6.x, Confidential AIX 5.6, 6.1, 7.0, Sun Solaris 8,9,10, VMWARE, E3500, E4500, E6500, Sunfire V880, V440, HP Sure Store Array, Sun Storage Array D1000, A5000, HP DL series (320, 360, 560, 580, 760,T3,Xen,Storagetek Sun 6140, L700,HBA,Connextrix manager, EMC VNX, EMC Unisphere, VERITAS Volume manager, System imager, Veritas Net backup, Veritas Cluster server, ssl, Tivoli, Iplanet webserver, Jboss, Apache, Tomcat, JVM, Oracle 10g, Oracle RAC/ASM.

Confidential

Linux/ UNIX Administrator

Responsibilities:

  • Monitoring and Resolving problems relating to Internet Servers, Services, Databases, Helpdesk queries and interacting with other Internet nodes to resolve issues regarding Internet services, etc.
  • System & Network Administration of large group of systems & network Linux, Windows Servers, Modems, Routers and Switches.
  • System Monitoring Heavy Disk I/Os, CPU Utilization of each server, Load on each server.
  • Share folders and assign permissions to those shares, assigning and managing disk quotas.
  • Setting up and sharing the network printer, planning and scheduling backups.
  • Antivirus installation on servers and nodes. Also includes updating and installing patches on servers
  • Implementing, Managing and Troubleshooting hardware devices and drivers, installing service pack and updating drivers.
  • Monitoring Sendmail, Postfix, NFS, NIS, and DNS Servers.
  • Support company mail infrastructure by maintaining multiple mail servers and assisting users with mail related questions.
  • Maintaining the backup of all the logs of users and mail logs for future correspondence.
  • Installation and preventive maintenance regarding system upgrade and implement diagnostic packages, Networking hardware and installation.
  • Configuring and Administration of users, groups, Creation/Deletion, Monitoring Mail Queues, File systems, network printer & device drivers.
  • Administration, Monitoring, Disk space Management, Ensuring Data security and Access control on Servers
  • Managing user Rights, Maintaining data and access security Assigning mail Quotas, Writing Scripts, LVM, RAID.
  • Occasionally Support for Windows
  • Involved in Formatting raw disks and partitioned them using the format utility, installed Red Hat operating system, created file system, devices and special files using mkfs.ext4 and resize2fs.
  • Managed Systems and Network related issues like Installation, Configuration and Troubleshooting on Red HAT platform.

Environment: Red Hat Linux AS3.0/ AS4.0/ AS 5.0, VERITAS Clusters, VERITAS Volume Manager, VMware, Hitachi Disk Array, Apache 2.0, NFS, Software RAID.

Confidential

Jr. System Administrator

Responsibilities:

  • Monitoring and Resolving problems relating to Internet Servers, Services, Databases, Helpdesk queries and interacting with other Internet nodes to resolve issues regarding Internet services, etc.
  • System & Network Administration of large group of systems & network Linux, Windows Servers, Modems, Routers and Switches.
  • System Monitoring Heavy Disk I/Os, CPU Utilization of each server, Load on each server.
  • Share folders and assign permissions to those shares, assigning and managing disk quotas.
  • Setting up and sharing the network printer, planning and scheduling backups.
  • Antivirus installation on servers and nodes. Also includes updating and installing patches on servers
  • Implementing, Managing and Troubleshooting hardware devices and drivers, installing service pack and updating drivers.
  • Installation, configuration and Operating System upgrade on Sun Solaris 8,9,10 and Red Hat Linux 4.0 on sun Servers & HP-Dl585 servers.
  • Installation of Oracle-8i Server, Oracle Client Software on the application server and configuring the connectivity using JDBC drivers for the DB. Troubleshooting the connectivity from the Application to DB, maintenance of the DB’s in server
  • Installed of all the required Software, patches, documentation, licensing trouble shooting. Used Symantec Enterprise Security Manager for system integrity check on newly build servers
  • Supported Bugzilla, Media Wiki, SVN running in Red Hat Enterprise Linux
  • Performed Red Hat Linux kernel, memory upgrades and undertook Red hat Linux Kick start installations.
  • Installation of Oracle Patches and Troubleshooting, Creating and modifying application related objects, Creating Profiles, Users, Roles and maintaining system security
  • Managed Red Hat Linux kernel, memory upgrades and swaps area. Red hat Linux Kick start Installation
  • SENDMAIL configuration and administration, testing the mail server.
  • Involved in making the new builds Infrastructure Ready, Application Ready & Production Ready.
  • Managed server nodes running Red Hat Linux, for application bioask.com
  • Used internal tools like ESM, Opsware Server Automation, Tideway
  • Co-coordinating with team members to push the newly builds into production on the said time-line
  • Wrote bash and Perl scripting for automation purpose.
  • Implemented Virtualization using VMware in Linux on HP-DL585.
  • Red Hat Linux kernel, memory upgrades and swaps area. Red Hat Linux Kick start Installation - Sun Solaris Jump start Installation. Configuring DNS, DHCP, NIS, NFS in Sun Solaris 8/9 & other Network Services.
  • Formatted raw disks & partitioned them using the format utility. Created file system using newfs and mounted it. Created devices and special files using mknod.
  • Network Monitoring Using Nagios tool.
  • Setup various user profiles, environment variables/security to ensure smooth operation.

Environment: Red hat Linux 4.0, Sun Solaris 8,9 Sun T2000, Solaris Volume Manager, Solstice Disk Suite, Veritas Cluster Server, Enterprise Security Manager, Opsware, Web logic 8.1, Oracle 9i/10g.

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