SUMMARY

• 9+ years of experience in UNIX/Linux system (User space and kernel space) administration, configuration, performance tuning, troubleshooting, installing, updating software packages (RHEL - 4.X,5.X,6.X,7.X, SUSE-10.X,11.X, Oracle Enterprise Linux(4.X, 5.X, 6.X, 7.X), Networking and writing UNIX shell scripts.
• Experience in planning, installation, migration, upgrade Red Hat Enterprise Linux (RHEL)-4.X,5.X, 6.X,7.X and production support.
• Expertise in installing and administering Windows 2003, Windows 2008 server, Windows 2012 server, and Windows 2012 Hyper-V server . Strong knowledge on Microsoft Exchange server.
• Experience in designing, implementing virtual datacenter on the top of the VMWARE ESXi 2.X, 3.X, 4.X, 5.X, Red Hat Enterprise Virtualization 2.X, 3.X and Hyper-V platform on Dell PowerEdge, Confidential ProLiant, and CISCO UCS severs with production support.
• Expert in Red Hat Linux 4.X, 5.X, 6.X & 7.X of heavy experience in install / rebuild servers. Understanding the business requirements, capacity planning, Vendor management, team co-ordination, business migration. Patching and Packages rollouts.
• Experience in monitoring the network and hosts using the Nagios, BMC, and Confidential Openview. Expertise in RHEL installation using the kickstart and configuration management using tools Chef, Puppet.
• Experience in working with NAS and SAN devices such as NetApp filters, Confidential Celerra, Confidential CLARiiON, VMAX, DMX etc.
• Experienced in installation, configuration, management and troubleshooting of critical application servers such as Oracle DB, WebLogic 10.x/11g/12c, JBoss 5.x/ 6.4, MariaDB, MySQL database, Apache Tomcat 6.x/7.x/8.x.
• Expert in managing, administering and installing RHEL services such as DNS, FTP, NFS, Samba, SMTP, HTTPD, NTP, Yum, SSH, VPN, RSA, SNMP, LDAP/Active Directory, Firewall, Iptables, kerberos etc.
• Experience in designing, administering and configuring Red Hat high availability cluster, storage cluster, load balancing cluster, high performance cluster and Hadoop cluster both the cloud platform and datacenter level.
• Experience in kickstart high performance cluster installing using Red Hat Cluster Suit(RHCS).
• Experience in deploying application and designing cluster on the cloud platform such Amazon Web Services (AWS) and Google cloud platform. Proficient in setting up Amazon EC2 instances, security groups and virtual private could (VPC).
• Extensive experience in configuring and managing Global File System (GFS), Zeta byte File System (ZFS), NFS/NAS, Storage Area Network (SAN), SSA disk storage environment.
• Experience in volume management, software RAID, disk management, VERITAS volume manager, Veritas File System (VxFS), Logical Volume Manager (LVM).
• Expertise in system performance monitoring, error logging, diagnostics, troubleshooting and fine-tuning: CPU, memory, cache, network utilization, managing and troubleshooting RHEL boot processes, upgrading kernel on RHEL, server hardening etc.
• Experience in managing the Red Hat package manager (rpm, yum), Red Hat satellite server, patching, upgrading software, installing third party software for server monitoring and management.
• Strong understanding of OSI, TCP/IP, UDP, Wireshark,LAN, tcpdump. Experience in job and task automation using the Cron (RHEL tools).
• Strong knowledge on UNIX shell scripting, Python, Perl and PowerShell scripting.
• Maintaining and Resolve the IT ticketing system.Providing 24/7 support to development and production environments.

TECHNICAL SKILLS

Operating Systems: RHEL (4.X,5.X,6.X,7.X), CentOS(5.X,6.X,7.X), SUSE (10.X,11.X), Oracle Enterprise Linux(4.X, 5.X, 6.X, 7.X), Fedora, Debian, SunOS, indows Server-2003, 2008/2012

Virtualization: VMware vSphere 4.0/4.1/5.0/5.1/5.5 , VMware ESX 2.5/3.0/3.5, VMware ESXi 3.5/4.0/4.1/5.0 , VMware vCenter, vSphere Client, VMware VDI, VMware ThinApp, View 4.6/5.0, Microsoft Hyper-V, VMware Update Manager, vCenter Lab Manager 4, vCenter Server, vCenter Update Manager, RHEV, RHEV-M, Hyper-V

Storage: Logical Volume Manager, Confidential Power Path, Veritas Volume manager

Clustering: Red hat High Availability, Storage, High Performance and Load Balancing Cluster, Hadoop Cluster, VERITAS Cluster

Cloud Platform: Amazon Web Services (AWS), Google Cloud Platform

Application Server: WebLogic 10.x/11g/12c,, JBoss 5.x/ 6.4, Tomcat 6.x/7.x/8.x

Web Servers: Apache Server, IBM HTTP Web Server

Database Servers: MySQL, MariaDB, Oracle DB

Network Services: DNS, SMTP, Microsoft Exchange Server, NAS, Samba, Apache HTTP, HTTPS, NTP, NIS, SNMP, DHCP, NFS, FTP

Networking Skills: OSI, TCP/IP, UDP, Packet Tracer, Wireshark, LAN, VLANs, tcpdump, WAN

Directory Services: Microsoft Active Directory, Open LDAP, Kerberos

Servers: Confidential DL 320, Confidential DL 330, Confidential DL 380s, Confidential DL 580’S, Dell Power Edge Servers, dell 2300, 2400, 2450,2850,2950,6300, CISCO UCS

Programming languages: C, C++, Java, J2EE, Python

Web Technologies: HTML-5, CSS-3, JavaScript, Wordpress

Automation Tools: Kickstart, Chef, Puppet

Monitoring Tools: Nagios, BMC, Confidential OpenView

Version Control: Git, GitHub, SVN

Scripting: Bash, korn, KSH, CSH, Perl Scripting, Shell Scripting, PowerShell

PROFESSIONAL EXPERIENCE

Confidential, Boston, MA

Lead Linux Engineer

Responsibilities:

• Installation, upgrade, configuration, troubleshooting, maintenance of (RHEL-4.x,5.X,6.X,7.X, SUSE-10.X,11.X, Oracle Enterprise Linux(4.X,5.X,6.X,7.X).Administered 2000 VMs running RedHat/SUSE/OracleLinux/CentOS.
• Installed VMWARE ESXi/ESX-4.X, 5.X, 6.X, created RHEL, CentOS virtual machines (VMs), standard images, server deployment based on the standard images.
• Designed and deployed VMWARE vSphere and VMWARE SRM (Site Recovery Manager). Managed ESX/ESXi servers using the vCenter, worked with vMotion, vStorage and ESX/ESXi clusters.
• Configured VMware on clustered environment, Implemented VMotion, Virtualized Windows servers using VMware Converter P2V and setup Lab Manager.
• Installed and configured application servers such as WebLogic 10.x/12c, JBoss 6.X, Tomcat 7.x/8.x.
• Installation and administration of DNS, SMTP, Microsoft Exchange Server, NAS, Samba, Apache HTTP, HTTPS, NTP, NIS, SNMP, DHCP, NFS.
• Worked with Confidential DL series, Dell Power Edge Model, CISCO UCS servers.
• Responsible for migration of servers with SAP, databases (Oracle database, DB2) from HPUX, Debian to RHEL.
• Upgraded and patched RHEL, CentOS, OpenSUSE servers to latest version. Installed and patched applications packages. Installed third party software, latest version of the hardware drivers.
• Deployed Puppet, Chef, RHEL kickstart for automation, configuration management in the whole infrastructure.
• Designed and implemented host level replacement and migration using the P2V (Physical to Virtual) and P2P (Physical to Physical).
• Responsible for user management using the directory services such as OpenLDAP, Microsoft Active Directory and Kerberos Authentication.
• Configured Amazon EC2 instances using AMI’s (RHEL, Suse). Installed and configured applications on those servers for development purpose.
• Responsible for administering volumes and volume groups using LVM and Veritas Volume Manager. Configured Red Hat Satellite server, yum server.
• Administered Windows2008/2012, Windows 2012 Hyper-v servers. Trouble shoots group policy, active directory issues and OS issues.
• Automate routine jobs using Cron and customized UNIX shell scripts.
• Server backup using the tar, cpio utils for local systems and Veritas Netbackup for enterprise level infrastructure wide backup.
• Modified existing Linux file system to standard EXT3, EXT4, XFS file system. Configuring and managing GFS (Global File System) on the top of the RHEL.
• Single point of contact for UNIX/Linux to implement Oracle RAC 11g on RHEL cluster nodes.
• Working with the native multipathing for the high availability installation / configuration on Red Hat clusters
• Installation and Configuration of vCloud Automation Center (vRealize) 5.2 as the Automation Solution.
• Responsible for data migration at host level using the Veritas Volume Manager, RHEL LVM.
• Documentation of installation, testing procedure before and after VM migration. Providing 24/7 on call technical support for the RHEL servers and VMWARE infrastructure.

Confidential, Cincinnati, OH

Sr. Linux Engineer

Responsibilities:

• Installation, upgrade, configuration, troubleshooting, maintenance of (RHEL-5.X,6.X, SUSE-10.X,11.X, Oracle Linux(4.X, 5.X, 6.X). Maintained and administered 80+ blade servers, 100+ Confidential 585 server.
• Installed, Configured and administered Red Hat high availability cluster, load balancing cluster and hadoop cluster.
• Wrote customized kickstart scripts for each servers to install RHEL, SUSE, Oracle Linux servers (VMs).
• Upgrade and patched hardware drivers, existing software using the Red Hat Satellite server, yum, rpm, up2date tools.
• Installation, configuration of ESX/ESXi 4.X and 5.X servers. Applying security patches to the ESXi servers.
• Performed VMWARE ESXi host upgrade from version 5.1 to 5.5 in the existing environment. Perform Physical to Virtual (P2V) conversions and Virtual to Virtual (V2V) on servers utilizing VMware Converter.
• Troubleshoot system performance issues such as over memory and CPU usage by an application on different Linux distributions. Responsible for system log management (journalctl), data backup using tar/dd tool.
• Installation and administration of DNS, SMTP, Microsoft Exchange Server, NAS, Samba, Apache HTTP, HTTPS, NTP, NIS, SNMP, DHCP, NFS.
• Worked on homogeneous and cross-platform file sharing protocol such as FTP, Samba, NAS, NFS for sending and receiving files between local and remote servers.
• Designed and implemented iSCSI storage based on the RHEL. Worked with MySQL, Oracle DB, IBM DB2.
• Installed, configured and maneged WebLogic 10.X, JBoss 4.X, Tomcat 6.X, 7.x/8.x.
• Installed, maintained and configured Puppet, Chef based configuration management system.
• Servers and clusters performance monitoring using sar, top, prof, vmstat, iostat, netstat, Nagios.
• Documentation of installation, testing procedure before and after VM migration. Providing 24/7 on call technical support for the RHEL servers and VMWARE infrastructure.
• Upgrading memory, CPU, disk size on the existing VMS, ESX/ESXi sever. Created VM Machines for Test Environments to Test Applications.
• Performed volume management on newly assigned LUNs. User and group administration using the Microsoft Active Directory and OpenLDAP.
• Administered DNS server. Updated forward and reverse lookup files for all the new machines added in the domain. Created reverse lookup files for the new subnets added into the network.

Confidential, Boston, MA

Sr. Linux Administrator

Responsibilities:

• Installation, upgrade, configuration, troubleshooting, maintenance of (RHEL-4.X,5.X, SUSE-9.X,10.X, Oracle Linux(4.X, 5.X).
• Upgrade and patched the hardware drivers, existing software and third party software using the Red Hat Satellite server, yum, rpm, up2date etc.
• Design and implementation of OpenLDAP to centralize network device authentication. Configured the OpenSSH, Firewall and Iptables. Managing users and group accounts quotas
• NetApp Filer Storage and NAS administration. NFS configuration and ongoing maintenance
• Built RHEL, SUSE, Oracle Linux virtual servers (VMs) as per the clients need. Installed and configured applications on the top of the newly built servers.
• Installed, configured and managed WebLogic 10.X, JBoss 4.X, Tomcat 6.X.
• Installing and configuring Samba, squid, FTP Server, SMTP Server, RAID and LVM, send mail Server, and Network based Printers.
• Monitored network using the Nagios, BMC tools. Network issues troubleshoot using the top, ndd, traceroute, netstat, ifconfig, snoop etc.
• User management using the OpenLDAP. Configured root privilege for normal users using the sudoers.
• Experienced in Troubleshooting critical hardware and software issues and other day-to-day user trouble tickets.
• Automate routine jobs using Cron and customized UNIX shell scripts.

Confidential, Hartford, CT

Unix/Linux Administrator

Responsibilities:

• Installation, upgrade, configuration, troubleshooting, maintenance of (RHEL-4.X, 5.X, SUSE-9.x,10.X, Oracle Linux(4.X).
• User and group management, user and group quota, setting up passwords for the users and providing root privileges to normal users using the sudoers.
• Installed the Linux/Windows OS on the bare-metal/virtual servers using the kickstart and CD/DVD ROM.
• Installation and administration of DNS, SMTP, Microsoft Exchange Server, NAS, Samba, Apache HTTP, HTTPS, NTP, NIS, SNMP, DHCP, NFS.
• Installation and administration of MySQL DB, Oracle DB on both the Windows and Linux severs.
• Kernel tuning, Writing Shell scripts for system maintenance and file management.
• Administered Windows2003 servers. Trouble shoot group policy, active directory issues and OS issues.
• Upgrade and patched the hardware drivers, existing software and third party software using the yum, rpm, etc.
• Added Raw Disk mappings to VMs from available storage. Perform health checks of the storage and SAN infrastructures.
• Provide 24/7 technical on-phone and on-call support.
• Installed and managed ESX-2.X and 3.X. Built and maintained HA and DRS clusters. Installed ESX patches using the update manager.
• Upgrade and migration from 2.X to 3.X. Troubleshoot the issues with the slow data store access.
• Automate routine jobs using Cron and customized UNIX shell scripts.
• Installed, configured and managed WebLogic, JBoss, Tomcat.

Confidential, Woonsocket, RI

Junior Linux Administrator

Responsibilities:

• Installation, upgrade, configuration, troubleshooting, maintenance of (RHEL-3.X, 4.X, 5.X, SUSE-9.X,10.X, Oracle Linux(4.X).
• User and group management, user and group quota, setting up passwords for the users and providing root privileges to normal users using the sudoers.
• Installed the Linux/Windows OS on the bare-metal/virtual servers using the kickstart and CD/DVD ROM.
• Installation and administration of DNS, SMTP, Microsoft Exchange Server, NAS, Samba, Apache HTTP, HTTPS, NTP, NIS, SNMP, DHCP, NFS.
• Installation and administration of MySQL DB, Oracle DB on both the Windows and Linux severs.
• Kernel tuning, Writing Shell scripts for system maintenance and file management.
• Administered Windows2003 servers. Trouble shoot group policy, active directory issues and OS issues.
• Upgrade and patched the hardware drivers, existing software and third party software using the yum, rpm, etc.
• Added Raw Disk mappings to VMs from available storage. Perform health checks of the storage and SAN infrastructures.
• Provide 24/7 technical on-phone and on-call support.
• Installed and managed ESX-2.X and 3.X. Built and maintained HA and DRS clusters. Installed ESX patches using the update manager.
• Upgrade and migration from 2.X to 3.X. Troubleshoot the issues with the slow data store access.