linux adminstrator
Resume:
BijeshBaidya
******.*****@*****.***
Unix/Linux System Administrator/Engineer
SUMMARY:
Linux/Unix system administratorwith Over Seven years of experience on RHEL 4.x, 5.x, 6.x,CentOS 4.x, 5.x, Suse, Oracle Enterprise Linux, AIX, Solaris 8,9,10 and VMware vSphere ESX/ESXi environment.
Experience with Virtualization technologies like installing, configuring, administering VMware ESX/ESXi and Citrix Xen Server. Created and managed VMs (virtual server) and also involved in the maintenance of the virtual server.
Hands on experience with VMware vSphere ESXi 4.1/5.0/5.1/5.5
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.
Experience using various search, text, and file systems. Have used ‘grep’, ‘Sed’ etc.
Experience in Installing, configuring and maintaining Samba, Web Sphere& Web Logic Application Servers, Nagios and Chef.
Supported AWS Cloud environment with multiple instances and configured Elastic IP & Elastic Storage and also experience working on implemented security groups.
Experience in Server monitoring, capacity planning, application monitoring with the help of Nagios, Cacti,
Worked on day-day tasks; User Administration tasks like adding, deleting and modifying user data and documenting all user data in a centralized location.
Performance tuning of Linux machines in the environment by kernel parameter tuning, identifying process that hog the system resources and containing them.
Experience 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 andPerl scripts used to automate day-to-day administrative tasks.
Responsible for OS maintenance activities like upgrading the OS, updating the services and third party software’s.
Worked in maintaining integrity of Linux, Unix servers by performing patching operations on a regular and planned way.
Installation and configuration of Web Application servers like Apache, Tomcat and WebLogic.
Worked on testing ofLinux 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.
TECHNICAL SKILLS:
Operating System
Solaris 10/9/8, HP-UX (10.20, 11.00, 11.11, 11.23), IBM AIX (4.3, 5.1L, 5.3L), RedHat Linux (AS/ES 3/4/5), VMware ESX 4.X, Windows NT 4.0/2000/2003/XP/vista
Hardware
TSeries, MSeriesServer, HP 9000 K,L,N class server, IBM RS/6000, pSeries, Xseries, HP/IBM/Blade Servers.
Network Protocols/Services
DNS/Bind, Samba, TCP/IP, NFS, Telnet, DNS, LDAP, SSH, DHCP, NAT, LAN, WAN, ARP/RARP, FTP/TFTP, ifconfig, route, netstat, xinetd, HTTP.
Storage
SAN EMC Symmetrix 800/ DMX1000, 2000 & 3000, EMC CLARiiON 500, 600, 700,
Databases
MySQL, PostgreSQL, SQLite, DB2, Oracle
Web /Application Server
Apache Tomcat, WebSphere, Web logic
Automation Tools
Puppet, Chef, Kickstart
Mail Servers
SMTP, POP, IMAP, qmail, Sendmail, Postfix
Languages
C, C++, Java, Shell, awk, Perl, Bash, Python
Security
SSH, SSL, IPchains, IPtables, Tcpdump.
PROJECT SUMMARY
Client: Lexmark International, Lexington, KY Sept 2015 – Till date
Role: Sr. Linux/UNIX Administrator/Engineer
Responsibilities:
Worked on Building, administering, monitoring and troubleshooting RHEL4.x/5.x/6.x, AIX 6.1 on Dev., test and production environment.
Involved in production support for multiples applications residing on Linux and Windows environments.
Processing the work request like build and deploying the codes on UAT, Staging, and Production environments.
Raised, handled and closed multiple Change Management and Trouble Management tickets accordingly with Standards.
Worked with Storage Area Networks (SAN) that consisted of Hitachi and EMC storage.
Added, removed and resizedLogical volumes using LVM in Linux and implementing software RAID at installation time.
Worked on regular disk management, partitioning according to 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 others 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.
Performing O/S and kernel upgrades on Linux servers.
Performed host based SAN migration on Standalone and Cluster Linux servers
Troubleshoot backup issues, Perform 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, Shell and Perl Scripting, BMC Remedy 8.1, 8.1.0x,.
Client: Penn State University, State College, PA Apr 2014 – Aug 2015
Role: Linux/UNIX Administrator/Engineer
Roles & Responsibilities:
Installed and configured RHEL 4.3, 4.7, 5.1, 5.2, 5.3,6.x and SunOS on Dell and IBM Blade center servers.
Administered, maintained Red Hat 4.0, 5.0, 6.0 AS, ES, Troubleshooting Hardware, Operating System Application & Network problems and performance issues
Installed and upgradedRedhat Linux, firmware, failed hardware and system support software Dell PowerEdge Servers.
Extensive experience working on performance monitoring with SAR, Iostat, VMstat, MPstat and Other Tools.
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 in Linux on HP-DL585.
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
IntegratedUNIX file systems using packages like SAMBA. Settup 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
Deployed latest patches for Sun, Linux and Application servers,
Installed and configured Sudo for users to access the root privileges.
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.
Managing Cronjobs, batch processing and job scheduling.
Supported and in-depth troubleshooting of Linux/Unix systems 24 x 7 Environment
Environment:Linux, VMWARE, IBM 8677, IBM Blade center Servers (HS20, HS21), Lenovo workstation’s (D2, D10, D20), IBM P570, P575, P595, IBM IntelliZpro-9228, MAC pro workstation’s, DELL PowerEdge2950,6400, NFS, NIS, DNS, PICS
Client: Wal-Mart, Bentonville, AR Sept 2012 – Mar 2014
Role: System Administrator (Linux/Unix)
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.
Deployed Puppet, Puppet Dashboard, and PuppetDB for configuration management to existing infrastructure.
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.
Expertise in Performance Monitoring and Performance Tuning using Top, prstat, sar, vmstat, ps, iostat etc.
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.
Expertise in creating and managing Logical Volume Manager inAIX, HP-UXandRedhat 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.
Sendmail configurations and administrations, securing the mail servers.
Expertise in Volume management, Disk Management, software RAID solutions using Veritas Volume manager.
Creating File System, managing & checking data consistency of the File System.
Setup and configure Veritas NetBackup 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.
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
Client: 3M, Austin, TX Jan 2011 – Aug 2012
Role: Linux/UNIX Administrator
Responsibilities:
Extensively worked on Installation, Configuration & Upgrade of AIX, HP-UX, Linux operating systems.
Managed Users for AIX and Linux Servers and assigned rights to access network resources
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 kickstart server and updating/applying patches to the servers using Redhat Satellite server.
Configured and maintained network services such as LDAP, DNS, NIS, NFS, Web, Mail, FTP
ImplementedRAID 0/1/5 for creation of logical volumes using VERITAS Volume Manager in SAN Storage Area Environment
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.
Managed Network troubleshooting applications TCP/IP including Ethernet, IP addressing & Sub netting, routing.
Creating virtual machines using Xen hypervisor on Xen servers, installing Redhat, CentOS using kickstart.
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.
Worked with Storage team to configure EMC SAN, NAS configuration.
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
Client: Jyoti Group, Kathmandu, Nepal Nov 2008 – Dec 2010
Role: Jr. Linux Systems Administrator
Roles & Responsibilities:
Worked on administration and maintenance of Red hat Linux
Installation of VMware ESX3.5.x4.0x infrastructure on Dell Power Edge Server and administration of VMs
Worked on User administration setup, maintaining account, Monitor system performance.
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.
Manage logical Volume manager on Red hat Servers.
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
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
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