Summary:

• Have 6+ years of experience as UNIX System Administrator in Red Hat Enterprise Linux, SUSE Linux, Fedora, Ubuntu, CentOS, and IBM-AIX.
• Planning, Installation, Configuration, Maintenance and Administration of AIX 4.3/5.1/5.2/5.3/6.1 and Linux (Red Hat 4, 5 & SUSE) and day to day system admin tasks.
• Setting up printers / remote queues / Info-print management Migration upgrades of AIX (4.3.3/5.1/5.2/5.3/6.1), including system tuning, security, backup, recovery and upgrades of IBM AIX and Linux.
• Experience in working on high end servers like IBM RS6000 (p570, p650, p 655, p670, p690), IBM xSeries rack mount servers like x3650, x3550.
• Installation of patches, Security fixes, packages on AIX, Linux and Windows NT/2000 Servers.
• Worked on Group/User administration, Startup & Shutdown Scripts, Crontabs, File System Maintenance, Backup Scripts and Automation.
• Experience in working with VMware ESX servers for enterprise level virtualization and Xen.
• Expertise in configuring Kickstart and Jumpstart Installation Methods.
• Experience in using various transport, application and internet protocol layers like BGP, DHCP, DNS FTP, HTTP, IMAP, POP3, RPC, SMTP, SOAP, SSH, Telnet, TLS/SSL, TCP/IP, IP(IPv4, IPv6).
• Installed, configured and supported WebSphere Application Server, IBM HTTP/ Apache Web Servers in AIX and Linux environments. Knowledge of Samba Servers.
• Worked extensively on creating volumes using different RAID levels using LVM in Linux
• Experience in creating and managing LPAR and DLPARs using HMC.
• Experience in using TPM emulator in Linux servers.
• Experience in configuring, monitoring and troubleshooting various file systems like Ext 3, Ext 2, UFS, NFS and JFS.
• Experience in installing, updating packages in Red Hat Linux servers using RPM’s and YUM repositories.
• Good working knowledge on HACMP 5.x and NIM Master and Clients.
• Use ILO/HMC for remote access of servers on Linux/AIX respectively.
• Worked extensively on Red Hat Linux DNS servers from installing BIND package, updating the BIND database and troubleshooting the problems.
• Having complete UNIX power user toolkit, expertise in using vi, sed, awk, perl and basic SQL.
• Experienced with the installation and configuration on Apache 2.x, 1.3.x, 1.2, JBoss4.0.x WebServers and, BEA Web Logic 8.x, 9.x servers.
• Expertise in managing the Run jobs that needs to be run periodically in the Datacenter environment.
• Writing shell and Perl scripts for System administration and updating them in the Scheduler / Cron.
• Hands on experience in providing first level of Support to Oracle databases, Network routers, and Web applications and creating the run book to solve the repetitive problems on UNIX environment
• Hands on experience in installing, configuring and supporting web servers like APACHE, TOMCAT, IIS, iPlanet over DMZ (Demilitarized Zone) in order to enhance the security of the server access
• Good knowledge in Operating system level configuration of SAN using IBM Shark Storage, EMC and Hitachi technologies and also worked with NAS and HDS.
• Installation, Configuration and Administration of VERITAS Volume Manager (VxFS/VxVM/VCS), Solstice Disk Suite (SVM/SDS) and LVM.
• Have strong knowledge of ITIL processes for the administration of servers.
• Knowledge of networking (TCP/IP, Ethernet), FTP, SFTP, SUDO, NFS, NIS, DNS, DHCP and RAID levels.
• Expertise in Planning, Installation, Configuration and Maintenance of IBM HACMP V4.5 on AIX 5.1/5.2/5.3.
• Experience in Migration of HACMP 4.3.1/4.5 to HACMP 5.1 using Node-by-Node migration without changing the cluster setup.
• Implementing IBM Tivoli Enterprise Console (TEC) for problem diagnosis and better performance.
• Experience in backup/recovery/archive & Hierarchical Management using Tivoli Storage Manager Backup utility and mksysb images of root volume group to meet data archiving requirements and disaster recovery readiness.
• Experience in periodic checking of the open ports / services on the servers using tools like nmap and ISS.
• Administered shell interfaces, groups/user accounts, login scripts, and kernel patches & updates.
• Hands on experience in Red Hat Linux Performance Monitoring tools using vmstat, iostat, prstat, mpstat, sar & top.
• Good communication skills, working without supervision, working in team environment.

Technical Skills:

Operating Systems:

Linux(RedHat3.x,4.x,5.x,CentOS,SUSE),IBM-AIX5.1/5.2/5.3/6.1SuSolaris2.6/7/8 Windows 2000/NT4.0, Windows 95/98/ME/XP

Hardware:

IBM RS/6000, pSeries 520, 550, 570, 575, 590, 595, 650, 630,670, M80, S80, H70 and H80, z/VM-9 series, IBM ESS (Enterprise Storage Server), DS8000, IBM 3494, 3583 Automated Tape Library, Brocade, SUN Enterprise 450, SunFire 4500,V880, V480,E420R,E450,E250, HP DL 380s and 580s,EMC Symmetrix, Hitachi arrays, Backup Devices, Ethernet Hubs, Routers, Repeaters, Jukebox, Printers DELL Poweredge 1650, 2850, 2950, 6400

Protocols:

TCP/IP, SMTP, SNMP, ICMP, FTP, TELNET, UDP, LDAP

Storage:

EMC Symmetric, Hitachi Arrays, Sun Storage D1000, A5000/5200, SAN, NAS

Networking:

NIS, NIS+, DNS, NFS, Sendmail, Novell Netware, AUTOFS, LAN, WAN, Firewalls protocols like DHCP, SMTP, SNMP, IPVP4, IPV6, FTP, Intranet

WebServer:

Apache Tomcat/http server, IIS, Jboss, IBM RSA/WAS, Web logic, Websphere

Languages:

Shell Scripting ( ksh, sh, csh, perl, bash, sed, awk, python ),Dtrace Tool Kit, C, C++, VISUAL BASIC, HTML, JAVA

RDBMS:

IBM UDB2, Oracle 7.x/8.0/9i/10g/11g, MS-SQL Server 7.0/6.5 and MS-Access 97/95, Oracle RAC.

Third Party SW:

VVM, VxFS, VxVM, LDAP, LDOMS, TSM, Humming Bird, EMC Power Path, MPXIO, JDK 1.5.0_x, ESX VMware, VI3/Virtual Center Server

Tools:

Service Center, Remedy, Opsware tool, Netvalt and VERITAS Netbackup 3.5/4.0/5.1 and 6.5, Lagato Netbackup and BMC Patrole.

Cluster Services:

Red Hat Cluster Suite, VERITAS Clusters, Sun Clusters

Professional Experience:
Confidential,Schenectady, NY June 2011 – Till Date
Sr. Linux System Administrator

Responsibilities:

• Administered, maintained Red Hat 4.0, 5.0 AS, ES, CentOS 5.3/5.4 troubleshooting hardware, operating system, applications & network problems and performance issues.
• Installed, configured and maintained CentOS servers.
• Deployed latest patches for, Linux and Application servers, performed Red Hat Linux Kernel Tuning.
• Install and configure DHCP, DNS (BIND, MS), web (Apache, IIS), mail (SMTP, IMAP, POP3), and file servers on AIX and Linux servers.
• Migrated database applications from Windows 2000 Server to Linux server.
• Implementation of Samba to help printing and file sharing in the mixed Environment.
• Installing and setting up Oracle9i on Linux for the development team.
• Installed Web Logic 9i with SP5 Server and configured Domains, Admin and managed servers for Applications to be deployed.
• Provided production support of Apache and JBoss including installation, configuration, and management and troubleshooting.
• Implemented virtualization using VMware in Linux on HP-DL585 and IBM-z/VM series.
• Linux kernel, memory upgrades and swaps area and performed Red hat Linux Kickstart installations
• Hardware Maintenance and System Administration of existing RS 6000 running AIX (40 systems in Network)
• Implemented day-to-day tasks in Red Hat Linux that include upgrading rpms, kernel, HBA driver, configuring SAN Disks, multipathing and LVM file system
• Created users, manage user permissions, maintain User & File System quota on Red Hat Linux, CentOS and AIX.
• Installed, configured and administered AIX 4.3.3, 5.1 & HACMP 4.4.
• Upgraded AIX 4.3x to AIX 5L v5.1, 5.2, 5.3.
• Performed successful installations, configuration and maintenance of Highly Available Cluster Multi Processing (HACMP).
• Experience in Migration of HACMP 4.3.1, 4.5 to HACMP 5.1 using Node-by-Node migration without changing the cluster setup.
• Worked on Webservers; JBoss, Tomcat 5.x/4.x/3.x & Apache Server 2.x/1.x.
• Apache/Tomcat server, mail server, MySQL database, and firewalls in both development and production.
• Developed Korn and Bash shell-scripts to automate routine activities.
• Configured and administrated Lpar’s/DLpars’s.
• Data Warehousing and System Backup using tar, cpio for local systems and Veritas Netbackup for enterprise wide backup and recovery.
• Manage systems using remote consoles like ILO for HP Hardware and HMC for IBM P-Series.
• Setup network printers and installed client/server applications. Defined/setup network protocols, Network File Services (NFS), and Network Information Services (NIS) in Linux and AIX systems.
• Network trouble shooting using ‘ndd’, \'traceroute\', \'netstat\', \'ifconfig\' and \'snoop\' etc.
• Provided support by 24x7 shift rotation basis and pager support.
• Monitored trouble ticket queue to attend user and system calls, attended team meetings, change control meetings to update installation progress, and for upcoming changes in environment.
• Updated data in inventory management package for Software and Hardware products.
• Worked with DBAs on installation of RDBMS database, restoration and log generation.

Environment: Red Hat Linux 4.0,5.0 AS ES,CentOS 5.1/5.2/5.3,AIX 4.3,5.1,5.2,5.3, HP-DL585, HACMP 4.2.x,4.3,4.3.1,4.4 , Veritas Netbackup, SAN Storage, 4.5.5, IBM-z/VM, Oracle 9i, Samba, NT/2000 Server, Websphere, Web Logic 8.1, VMware ESX 2.x, LPAR, DLPAR ,Tomcat 3.x,4.x,5.x, Apache Server 1.x,2.x,Jboss 5.0, Korn, Bash.

Confidential,Champaign, IL Apr 2010 – May 2011
Sr. Linux System Administrator

Responsibilities:

• Installation, configuration & administration of RED Hat Linux 8/ 9/ RHEL 3.x/4.x/5.1,5.2, CentOS 5/5.1 and AIX 5.1/5.2 servers.
• Configured IBM p5,B80,RS6000,520,550,570,590,595,610,690.695, z/VM 5.4 for production, staging and test environments.
• Responsible for determining hardware and compatibility requirements for installation of application software and different tools.
• Upgraded IBM-z/VM 5.4 servers to new technology levels configured LVMs on AIX 5.1, 5.2.
• Logical Volume Management (LVM) administration of AIX.
• Performance Management & Tuning of AIX UNIX Kernel.
• Managing Compaq and Linux workstations and servers.
• Installation of patches and other software packages
• Installation of Oracle Patches and Troubleshooting, Creating and modifying application related objects,

Creating profiles, users, roles and maintaining security.

• Configured File Systems, users and group for Oracle and Websphere.
• Configuration of Kernel parameters for Oracle Database.
• Developed Shell scripts (Korn/Bourne) for automating the batch jobs.
• Extensively used LVM, created VGs, LVs, and disk mirroring.
• Monitored file system space using simple shell scripts; resize file systems as and when required.
• Configured clustering by using Veritas Clustering.
• Created users, manage user permissions, maintain User & File system quota on Linux servers.
• Backup configuration using Veritas Netbackup.
• Administrator of IBM RS/6000 servers running AIX 5.1 for support of on Oracle, DB2, DNS, FTP.
• Setup and configured network TCP/IP on Red Hat LINUX, CentOS and AIX servers including RPC connectivity for NFS. Created mount points for Server directories, and mounted these directories on the Servers.
• Setup of full networking services and protocols including NIS/NFS, DNS, SSH, DHCP, NIDS, TCP/IP, ARP, applications, and print servers to insure optimal networking, application, and printing functionality.
• Clustered multiple RS/6000 machines on AIX 5.1 using HACMP, configured HACMP cluster to keep applications running.
• Perform daily Tivoli Storage Manager (TSM) Administrator duties to ensure all information processed through systems and databases are efficient.
• Performed deployment activities, environment support including installation, configuration diagnostics, planning and upgrades for Jboss Application Server..
• Perform daily TSM, EMC, SAN Administrator duties to ensure all information processed through systems and databases are efficient.
• Installed and setup CUPS, LPD, configured local and remote printers.
• Installation and configuration of windows 2000 server /windows 2000 professional windows XP /windows 98.
• Coordinating network, creating users account, assigning rights, sharing permission and managing profiles.
• Creating and configuring network connection-using TCP/IP, IPX
• System policies and hardware profiles, hard disk configuration for fault tolerance, disk mirroring and backup the data using BACKUP devices.

Environment: IBM zSeries, z/VM5.1, AIX 5.2 Servers in IBM P570, 550, 570, 590, 595, 610, 690, 695, HACMP 5.3, SUSE Linux, IBM DS4300 Storage System, Red Hat Linux 3.x/4.x/5.x,CentOS 4.6/4.7/5, Tivoli Storage Manager 4.2, LDAP, HACMP Cluster, VERITAS Clusters, VERITAS Volume Manager, VMware, Hitachi Disk Array, Apache 2.0, NFS, Software RAID, DNS Servers. Confidential,Detroit, MI Feb 2009 – Mar 2010

Linux Administrator

Responsibilities

• Installed, Configured and maintained Red Hat Linux, CentOS AIX and Solaris servers.
• Support to Red Hat Linux ES 4.x, 5.1, 5.2 and CentOS on various IBM hardware Servers.
• Monitored Disk & Memory Utilization on AIX 5.1, 5.2.
• Upgraded IBM-z/VM 5.4 servers to new technology levels, configured LVMs on AIX 5.1, 5.Planned, Installed and configured SUSE Linux Enterprise Server on Blade Server JS 21 X series 3755.
• Installed and configured VMware ESX server on IBM x3650, x3550 servers.
• Defined and maintained disaster recovery plans.
• Installation of Red Hat Linux server as a Domain server.
• Installation of Linux server as a firewall and internet proxy server.
• Implementation of Samba to help printing and file sharing in the mixed Environment.
• Remotely managed Linux servers using ILO, DRAC, and Virtual Console Center.
• Installing and setting up Oracle9i and Websphere on Linux for the development team.
• Lead the data migration project for migrating Solaris and Linux Servers from EMC SAN to IBM ESS
• Managed networking between Linux and Windows environment.
• Have experience in working with various Linux machines which hosts various messaging services like mailing lists, mass email systems, and Imap services.
• Design, implementation and regular maintenance of VXFS, VVM and VERITAS Cluster, MC/Service guard Packages, load balancing.
• Configuration and administration of Fiber card Adapter’s and handling of SAN (SAN arrays, HITACHI, EMC)
• Upgraded Red Hat Linux OS on Websphere, Jboss, WebLogic and Oracle database servers from V3, V4 to V5.
• Installed and configured OpenSSH and TCP Wrappers.
• Maintained Data Centre administration.
• System & backup management using IBM ADSM Backup Server.
• Configured JBoss Application servers over Apache web server in Linux based systems.
• Scheduling of Daily, weekly, Monthly backups using Omni Backup, VERITAS Netbackup 3.4 and TSM Backups.
• Shell Scripting for automating the System Admin tasks.
• Installation & Maintenance like replacing bad disks including bootable disks, OS, patch installation, Configuration of DNS, auto mount, and NIS and NFS services.
• Created users, printers and assigned user profiles and responsibilities to users.
• Had experience in working with Virtual Tape Libraries
• File system management over SAN (EMC).
• Troubleshooting VMware ESX server related issues, maintaining their virtual server environment, creating and deleting virtual servers.
• Ticket based problem management.
• Trouble-shooted Linux in Rescue mode.
• Supported and Coordinated with networking team to monitor network activity and in design and set up of firewall systems
• Experienced in deploying J2EE components on IBM WebSphere application server using Application Assembly Tool.
• Experienced in Developing WSCP scripts. Recovering and Backup WebSphere configuration using XML Config tool.
• Excellent working knowledge in implementing LDAP security models using Netscape LDAP and IBM secure way (LTPA).
• Experience in server side technologies like Servlets, RMI, and EJBs on IBM WebSphere Application Server.
• Scheduled maintenance of windows and system downtimes.
• Achieved efficient and timely coordination between teams by establishing solid Cross-Functional Relationships and involved in ITIL standards implementation
• Experience in Shell scripting (bash, ksh) including JACL, WSCP to automate administration batch jobs including backing up WebSphere Admin repository.

Environment: Red Hat Linux 5.1,5.2,CentOS 4.6/4.7, IBM X-series and IBM Blade JS 21 X series 3755, Red Hat Enterprise Linux 3/4/5, Samba, EMC, Sun Tape Libraries, VERITAS Volume Manager 3.1, VERITAS Cluster Manager, Java, Tivoli storage manager, Compaq and IBM servers. Compuware Monitoring tool, VERITAS Net backup 4.5, Oracle 9i

Confidential,Nepal Dec 2007 – Dec 2008
Unix / Linux Administrator

Responsibilities:

• Provided 24x7 System Administration support for AIX 5.2/ 5.1 based servers and Red Hat Linux 3.x, 4.x and CentOS 3.7/3.8 servers and resolved trouble tickets on shift rotation basis for IBM’s Clients/ Customers
• Performed installation, configuration and maintenance of AIX 5.2/5.1 based p550/ p570/ p650/ p69, IBM Squadron servers and Linux (Red Hat and SUSE) servers
• Performed troubleshooting, tuning, security AUDIT, backup, recovery and upgrades of IBM AIX 5.2/5.1/4.3, HACMP 5.1/4.5 and Linux (CentOS) 4.0/3.0 based systems
• Maintaining SUSE Enterprises Linux 8, and Red Hat Linux AS 5 servers in development, test and Production environment and proactively monitoring and administering production and development servers.
• Managed HP and DELL servers running on CentOS Linux.
• Installed, configured and maintained VIO server on IBM AIX 5.2 based p-Series 570/ p550 servers
• Worked extensively on planning and configuration of LPARS/ D-LPAR’s on IBM p-series 570/ p550 servers
• Conducted planning, implementation and management of NIM Master server & NIM clients
• Wrote bash shell scripts for getting information about various Linux servers
• Planned, installed, configured and maintained HACMP 5.3 clusters on IBM Squadron/RS/6000 p-series servers
• Wrote shell scripts to automate the administrative tasks and management using cron, at, and batch
• Responsible for system backups using mksysb, mkcd, savevg. Also performed system backups through NIM and created archives of various software
• Creation of LVMs on SAN using Linux utilities
• Monitored overall system performance, performed user management, system updates and disk & storage management
• Installed, configured and monitored server by BMC Patrol, NMON & PTX
• Performed troubleshooting of CPU bottle necks, memory bottle necks and gave suggestions on performance improvements. Analyzed performance issues through PERFPMR
• Tuned scheduler algorithms using schedtune to fine tune priority formulas
• Wrote Technical documentation for various projects and worked with Technical writer to finalize the documents

Environment: : AIX 5.2/ 5.1, Red Hat Linux 4.1,4.2,4.3,4.4,CentOS 3.7/3.8/3.9, p550/ p570/ p650/ p69, IBM squadron, HACMP 5.1/4.5, Linux (Red Hat) 4.0/3.0, SLES 7, 8, VIO server, LPARS/ D-LPAR’s, NIM Master server & NIM clients, BMC Patrol, NMON & PTX.

Confidential,Nepal Oct 2006 - Nov 2007
Linux System Engineer

Responsibilities:

• Installation, configuration and administration of 1000+ Red Hat Linux servers and support for Servers.
• Installation, maintenance and regular upgrades of Red Hat Linux Servers using kickstart based network installation
• Provided 24x7 System Administration support for Red Hat Linux 3.x, 4.xservers and resolved trouble tickets on shift rotation basis.
• Managing Compaq and Linux workstations and servers.
• Installation of patches and other software packages
• Disk and File system management through Solstice Disk Suite on Solaris and other logical volume manager for other flavor of UNIX.
• Configuration of Hardware and Software RAID on Digital & Sun Servers
• Installation of Oracle Patches and Troubleshooting, Creating and modifying application related objects, Creating Profiles, Users, Roles and maintaining system security.
• 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.
• Performed the administration of the Domain Name Server and configuration of the Database Files.
• Wrote bash shell scripts for getting information about various Linux servers
• Installed and Configured Sendmail Utility on Sun UNIX Servers.
• Administering NFS Mounts.
• Troubleshooting Backup and Restore problems Creation of LVMs on SAN using Linux utilities
• Monitored overall system performance, performed user management, system updates and disk & storage management
• Performed OS upgrades and Patch loading as and when required.
• Backing up and restoring files across the network
• Wrote Technical documentation for various projects and worked with Technical writer to finalize the documents

Environment: Red Hat Linux 4.1,4.2,4.3,4.4, , SunFire 4500/V880 /V480/E420R/E450/E250,SunStorEdge L280, Sun StorEdge A1000, A5000, JBODs Compaq servers, Solstice Disk Suite, Oracle 7.x/8.x

Education:
Bachelors in Computer Science