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Linux/Unix System Admin

Jacksonville, FL
March 12, 2018

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Sachin Chilkuri

Phone: 847-***-****



Solid 10+ years of extensive experience on various flavors of UNIX/LINUX (Solaris, Red Hat Linux, SUSE, HP – UX and AIX).

Experienced in System Administration, Server builds Installs, Upgrades, Patches, Migration, Troubleshooting, Security, Backup, Disaster Recovery, Performance Monitoring and Fine-tuning on Unix/Linux systems.

Installation, configuration and maintenance of Oracle RAC 12C/10g/11g on Solaris, AIX and RedHat Linux.

Network and Authentication protocols (DNS, RPC, LDAP, Kerberos, NTLM, etc.)

Experience in Security Hardening in UNIX, Linux servers.

Very good experience in administration and maintenance of application services like DNS, Mail, HTTP, Apache Tomcat, Squid, Samba, DHCP, SMTP, FTP, NIS, NIS+, Auto FS, and NFS.

Sound knowledge of VERITAS Cluster Server, VERITAS File System, and VERITAS Volume manager.

Extensively worked on Solaris 11/10 containers, Zones for Virtualization.

Experience of installation, administration, and maintenance of Centrify AD authentication product.

Configured shares and provided access to clients using NFS and CIFS. Set up disaster recovery solution between FAS and Nearstore devices using Snapmirror, SnapVault scheduled Snapshots

Strong experience in virtualization (VMware) technologies, the experience of managing VMware farm consisting 1000+ virtual machines in mission-critical enterprise environment.

Performed kernel tuning, performance tuning for different web and java related applications on RHEL and Solaris Servers.

Installation, Configuration, and troubleshooting of system security applications like SUDO, SSH, Power Broker and Centrify.

Experience in Server build using Jumpstart, flash archive, NIM, Ignite and kickstart, Strong working knowledge of scripting and programming PERL and SHELL.

Proficient DB administration (Oracle, DB2, Sybase, and MySQL) knowledge for maintaining, pruning and performing required DB tasks.

Experienced in working with Storage Area Network (SAN), TSM, EMC CLARiiON, Celerra, EMC Symmetrix DMX, EMC VMAX, Control Centre and VMware.

Worked on NetApp Data ONTAP 7.x, 8.x and command System Manager

Hands-on Experience with NetApp Filers FAS 3020/3050/3270/6240/6040 and FAS 3070

Experience in designing and configuring open source management tools Puppet, Chef and CFEngine.

Worked with Automation/Configuration Management tools like Puppet 2/3/4, Mcollective, BMC Bladelogic Server Automation Suite v7/8, Chef 11/12, PSSH tools.

Developed the scripts to push patches, files and maintain configuration drift through the Puppet tool.

Experience in installation and configuration of Web Sphere, Apache, JBoss, and IPlanet, WebLogic, LDAP, and mail servers.

Experience using diagnostic and debugging tools such as Dtrace, Strace, truss, Top, OS tools, Bladelogic, BMC Patrol, Solaris Management Console and HP Insight Manager.

Proficient in System Backup and Recovery from tapes using ufsdump, ufsrestore, tar, and cpio.

Experience with Software and Hardware-based RAID 0+1, RAID 1+0 and RAID 5 on DELL, IBM, and HP servers.

Proficient in shell scripting (Ksh/Csh/bash/Sed/Awk), PERL, Java Scripts for Oracle and Java Applications and XML.

Potent communication skills developed through continuous interaction with global clients and management.

Automated tasks, Deployed Applications and proactively managing and changing

configuration of Unix based Servers using Puppet.

Ability to handle the significant workload with experience in managing multiple projects concurrently in a fast pace environment.

Independent problem solving and a good team player with strong interpersonal and communication skills.

Used Puppet and Chef to Automate tasks, manage configuration files, Install Packages,

Create mounts

Experience supporting 24x7 production computing environments. Experienced providing on-call and weekend support.


Master of Science in Managing Information Technology

Sullivan University,

Louisville KY.


Operating Systems:

Solaris 11/10/9/8, Linux (RedHat 5, 6, 7, Suse),OEL6.x IBM AIX 6.x,5.x, HPUX11.0,WindowsNT4.Windows98/2000/2003/2008/XP/VISTA.


Sun Fire 25K,15K, 6800, 4800, 2900, 890, 490, 480R, 880, 240, T2000, E4900, E2900, Sun Enterprise 10K, 6500, 6000, T5220, T5240, M5000, M3000, 3500, 450, 420R, 250, Sparc server 1000, Sparc station 20,10,5, Ultra 60, 2,1 DELL PE2850, 2950, R710, R810, R910, HPC 200/240 workstations, IBM Xseries X3650/3850

Utility Packages

VERITAS Volume manager (v4.x, 5.x) VXVM, Solaris Volume Manager, VERITAS Cluster Server (v4.x/5.x/6.x) VCS, VERITAS File system VXFS (v4.x, 5.x) Admintool, Remote Admin.


Shell (BASH, C), PERL, C, C++, PHP, JAVA, PL/SQL, HTML, JavaScript, J2EE, JSP, Servlets.


Oracle 12c/11g/10g/9/8 RAC, Sybase, Mysql, DB2


TCP/IP, DNS, NFS, NIS, SSH, DHCP, Cisco Routers / Switches and LAN, WAN, LDAP


Tar, Rsync, EMC Open Migrator, Nagios, Tivoli Monitoring, Remedy, BMC Patrol, Service NOW, Sendmail

Web Technologies

Lotus Domino 5 / 6, Apache 2.0, Weblogic 8.1, WebSphere, JBoss, IPlanet, Tomcat

Configuration Mgmt Tools

BMC Bladelogic v7,8, Puppet Version 2/3/4, Chef 11/12,


CCluster VERITAS, Red Hat Cluster suite, Platform LSF HPC, GFS, RAC

Virtual ServersVMware ESX 3.5.0 Server, VIO, VMware Infrastructure VI3, zVM, Experience in Private cloud Environments.


Client: Bank of America, Jacksonville FL. June 2011 to Current

Position: Sr. UNIX/Linux Systems Administrator


Administration of RHEL 5.x/6.x/7.x, OEL 6.x which includes installation, testing, tuning, upgrading and loading patches, troubleshooting server issues.

Mass provisioning of Red Hat Linux servers both physical and virtual using Bladelogic.

System support for all environments and applications teams.

Configure Vintela Authentication Servers and Powerbroker

Virtual environment powered VMware used vhsphere client to add Virtual disks and adjust resources.

Build and configure Server for Oracle RACs creating ASM and FRA disk using oracleasm and udev rules

Build and configure servers for IBM MQM

Setup IBM IMM for remote management.

Used LVM2 to combine LUNs to support ocfs2 file stems for RAC

Configure EMC and IBM SAN using multipath to creating aliases to disk and verifying failover paths

Experience in using inline-templates in the puppet environment.

Installing and upgrading VMware tools on client machines.

Extensively worked on VERITAS Volume manager and veritas cluster services.

Experience in editing Password and shadow file as required as part of the administration.

Automated tasks, Deployed Applications and proactively managing and changing configuration of Unix based Servers using Puppet.

Created project report and wrote technical document for various projects.

Actively involved in solving EMC Symmetix/CLARiiON, and Brocade switches issue.

Escalated high-level technical support issues to storage vendor (EMC/SUN) and management.

Supported Oracle, SQL database including Oracle RAC cluster implementation on SAN platforms

Installed and configured Puppet

Installed patched and built servers using Blade logic tool.

Installation and configuration of management tool Puppet across RHEL/Solaris environments.

Developed the scripts to push patches, files and maintain configuration drift through the Puppet tool.

Worked with EMC Storage team to get the LUNS and create new file systems.

Monitored system performance using sar, prof, vmstat, iostat, netstat, Nagios.

Tuning the kernel parameters based on the application/database requirement.

Automated tasks using cron for users and editing crontabs.

Knowledge of DNS, Kerberos,Powerbroker and Windows Authentication, to include authentication with other technologies for Single Sign-On

Fundamental understanding of authentication mechanisms such as Kerberos, LDAP and NTLM and use of necessary tools to troubleshoot them.

Identified and fixed all the security vulnerabilities.

Installation and configuration of Databases like Oracle, Cassandra and MySQL.

Installed and Configured RHEL 5.x\6.x and CentOS 5.x\6.x, SUSE Linux,OELVirtual

Machines in VMware ESXi using vCenter Server and vSphere Client

Creating, cloning Linux Virtual Machines, templates using VMware Virtual Client 3.5 and migrating servers between ESX hosts.

Experience working with privileged access control in tools such as PowerBroker

Deployed Puppet for automated management of machine configuration

Managed Puppet infrastructure through major version upgrades. Refactored Puppet code to leverage new features.

Installing Redhat Linux using kickstart and applying security policies for hardening the server based on the company’s policies.

Worked with Chef for deployment of Openstack components like Keystone(Identity) and Dashboard(Horizon), Glance, Nova, Percona Mysql Clusters, Swift.

Installed Solaris Software using Jumpstart/Flash Archives, custom building with packages, patches, and volume management.

Build an RPM for installing it using satellite server on all server's to avoid vulnerabilities.

Setting group policies, adding new OUs, moving servers to the correct OU in AD.

Worked on end-to-end O/S administration part of Data Center Migration project.

Designed and Automated Installation, configuration and implementation of Apache Tom Cat, WebSphere, JBoss, Puppet, Web Logic, Blade Logic and integrated with Remedy, HP Open View and Nagios.

Installed and configured and documented best practices of BMC Blade Logic 7.0 with Remedy.

Installed powerbroker on servers and configured it as needed.

Involved in support and upgrade of Puppet master server from 3.x to 4.x version on servers and clients.

Deployed DevOps using Puppet Dashboard, and Puppet DB for configuration management to existing infrastructure.

Involved in leading Automation Deployment Team by working with Puppet,experience in installing Puppet agents and pushing Manifests/Modules to 520+ Puppet clients. Deployed M-collective for orchestration and wrote some custom M-collective plugins to deal specifically with our needs.

Worked with auto and manual signing of SSL certs, setting the polling intervals for pushing the manifests and source files, between Puppet Master and Agents.

Acknowledged on Puppet-Forge modules, modified them and adapted the manifests to suit our infrastructure

Represented the Production Support organization on company-wide project teams.’

Monitored process and software changes that impact production support communicate project information to the production support staff and raise production support issues to the project team.

Prioritized workload, providing timely and accurate resolutions.

Performed production support activities, which involve assignment of issues and issue analysis and resolution within the specified SLAs.

Provided daily support with resolution of escalated tickets and act as liaison to business and technical leads to ensure issues are resolved in timely manner.

Suggested fixes to complex issues by doing a thorough analysis of root cause and impact of the defect.

Coordinated with Application Development Team to successfully deploy software releases in both User Acceptance Testing and Production environments

Configured the adapter in Blade Logic to communicate with the network devices.

Implemented best practices with Blade Logic tool and Trained Operations Team members.

Worked with engineering groups, Web Commerce Group, to plan, design, scope and implement development projects on pre-production as well as production systems.

Lockdown the local accounts to secure the environment using NIS.

Performed patching and OS upgrades (rebuilds) and associate hardware break/fix, triage and software installations related to the patching and OS upgrade activities.

Worked on User authentication project to replace NIS authentication with AD authentication on Unix and Linux servers using Certify product.

Configured NIC Bonding on the servers, created File systems, extended the Logical Volume space as per the business requirements.

Developed scripts for inbound and outbound of the data on servers.

Installed and configured webservers such as WebSphere, WebLogic, Apache, and Tomcat.

Managing systems routine backup, scheduling jobs like disabling and enabling cron jobs, enabling system logging, network logging of servers for maintenance, performance tuning, testing.

Troubleshooting tickets, which include storage, network, system related issues using BMC Remedy & Service Now.

Performed Storage migrations on SAN and NAS servers.


Operating System:

Red Hat Enterprise Linux 5.x/6.x/7.x, CentOS 5.x/6.x, AIX 6.x, 7.x, Suse Linux, OEL 6.X

Server Hardware:


Applications and tools:

VMware ESXi 5.x, Nagios, and SolarWinds, Puppet, Openstack


Oracle, DB2, SQL,No SQL Database

Client: SCI investments Philadelphia, PA June 2010 – June 2011

Position: Sr. System Engineer (UNIX/Linux)


Installed and Configured RHEL 5.x\6.x and CentOS 5.x\6.x, SUSE Linux, OELVirtual Machines in VMware ESXi using vCenter Server and vSphere Client

Installed and configured Oracle Database Express Edition 11g, Oracle Database 12c Standard Edition, Oracle Database 12c Standard Edition One, Oracle Database 12c Enterprise Edition on CentOS 6.x and RHEL 6.x

Kick Start Servers and booting the images using PXE in Red hat Linux.

Successfully installed and configured Oracle RAC on Red Hat Enterprise Linux and CentOS.

Provided complete monitoring and alerting for servers, applications and serveries using NagiosXI

Installed and Configured Nagios XI server in CentOS 6.4, also developed few plugins and checks to monitor various system related parameters, services, and processes.

Creation of Disk groups, volumes, and plexes using VERITAS Volume Manager. Configured and managed virtual disks using RAID (0, 1, 5, 0+1,1+0) levels.

Implementation and Management of Disk Quota on Red Hat Linux as well as NetAppfilers.

Planning & creating volumes and Scheduling the job, making sure the recommended processes are taken care while volumes are created.

Implemented Enterprise level network reliability using NIC bonding, IPMP, and link aggregation.

Migration of the servers from one OS to another OS and (SUSE to RHEL and RHEL to SUSE)

Involved in Oracle 11g RAC implementation, and configured HAIP for network reliability.

Worked on EMC VMAX storage, and different multi-pathing software’s such as multipath and EMC power-path.

Configure enterprise level NAS, NFS and CIFS shares on netapp filers, Supported cifs, nfs3, nfsv4.

Written Shell scripts to automate the administrative tasks using Cron and at in Solaris and Linux.

Implementation of SSH for secure transfers and implementation of PKI between servers to enable password less logins between Servers.

Configured IP bonding for failover load balancing.

Configured multipath for SAN.

Administered Red Hat Linux servers for several functions including managing Apache/Tomcat server, mail server, My-SQL database, and firewalls using IPTABLES in both development and production.

Installed, configured and provided extensive support in code deployment and application level troubleshooting for Java-based applications NCCM and CPSC.

Provided support in the development of NCCM (Network Configuration and Change Management), an application which provides integrated and comprehensive secured configuration and a platform to manage, audit and secure all the network devices.

Automated tasks and Processes in Red Hat Enterprise Linux using Shell Scripting, Perl and Python Scripting.

Automated tasks, Deployed Applications and proactively managing and changing the configuration of Unix based Servers using Puppet.

Worked with customers in setting up the servers and providing ongoing support in troubleshooting application and network related issues

Worked in datacenter to Rack the servers, Installing OS, Setting up network connectivity and Attaching Storage

Creating volume groups, logical volumes, extending logical volumes based on the requirement


Operating System:

Red Hat Enterprise Linux 5.x/6.x, CentOS 5.x/6.x, AIX 6.x, 7.x.OEL 6.X

Server Hardware:


Applications and tools:

VMware ESXi 5.x, NCCM (Network Configuration and Change Management), Nagios XI and Nagios and SolarWinds


Oracle, DB2, SQL

Client: HSBC Hyderabad, India Jan 2007 – June 2010

Unix/Linux Systems Administrator


Performed system administration of UNIX servers by using Operating Systems of Solaris, AIX, Redhat Linux and HP-UX.

Installed, configured, and maintained WebLogic and Oracle DB Servers on OS Solaris, AIX and Redhat Linux.

Performed Decommissioning on AIX, HP-UX Servers.

Installation and administration of Veritas Foundation suite including Veritas Volume Manager, Veritas file system, Veritas Cluster services, Veritas NetBackup.

Experience in Installation and Configuaration of LDOMS 1.2&1.3 (Control domain, I/O domain, Logical domains) Virtualization in Solaris 10.

Very good knowledge on Advanced Power Virtualization on IBM System P5, P6.

Involved in applying Patches, Installing patch bundles on Solaris, AIX, HP-UX and Redhat Linux.

Build LPAR system and Installed AIX 5.3, 6.1 on LPAR using NIM Power 5, Power 6 systems.

Configure VERITAS Cluster on Solaris and AIX environment and support.

Configuration of Hardware and Software RAID on Digital & Sun Servers

Working with Engineering Team to build New Linux Servers.

Administrative tasks such as System Startup/shutdown, Backup strategy, Printing, Documentation, User Management, Security, Network management, dumb terminals, and devices carried out.

Configured VMware and installed several Linux and Windows Operating Systems according to the client needs. Also involved in maintenance and Troubleshooting of VMware

Maintenance of various versions of Linux Servers (RHEL 4.6,5.3,5.6)

Supported some Windows and MacOS X support under the direction of other systems administration staff.

Integrating UNIX file systems using packages like SAMBA. Setting up printers on UNIX / NT machines to work seamlessly across platforms.

Administering NFS Mounts.

Responsible for event processing, change management and problem determination in HACMP environment.

Extensive experience in Installation of Oracle RAC on Solaris 10 and AIX (5.3/6.1) environments, Configuring of nodes, Virtual IP, Private and Public network for Oracle RAC.

Set up Virtualization that includes Installation and configuration of Virtual I/OServer (VIOS), and Client LPAR, Dlpar Provisioning and Micropartitioning.

Responsible for performance tuning of AIX systems, applying upgrades to AIX (current version 5.3 to upgrade 6.1).

Backing up and restoring files across the network, Performed OS upgrades and Patch loading as and when required.

Plan, design, Implementing, Installation, and configuration Operating System upgrade on Red Hat Linux 4.0 on & HP-Dl585 servers.

Experience in Developing KORN, BASH, PERL, Python shell scripts to automate cron jobs and system maintenance. Scheduled cron jobs for job automation.

Worked in configuring and setup connectivity between web servers, database servers and directory servers as a process server administrator.

Actively participated Disaster Recovery (DR) Tests.

Planning configuring storage using LVM.

Logical Volume Management (LVM), Installed Veritas Volume Manager 4.1 and created file systems, mirrored and striped volumes

Applying software maintenance, program fixes and keeping the system software releases current.

Involved in post production support for solving complex TICKETS.

Performed IBM Total product Storage Installation on different Operating Systems.

Supporting various applications on UNIX environment.

Managing Task plans and uploading into database

Software Deployments on a request basis for the production environment.

Building Task Plans for all S/W deployments and review with Application teams.

Coordination with the off-shore team to implement any changes in production Environment.

Day-Day application support on production and technical documentation for critical prod issues, on-call pager support 24/7 environments.

Work with Off Shore Team to troubleshoot Development issues on the production environment, attend weekly status calls and discuss resolved issues and ongoing issues.


Solaris 8, 9 & 10, RHEL, AIX 5.3,6.1, HP-UX 11.11, 11.23, E10K, E25K domain servers, Sun Fire V440 v210,v220, v240, Sun Blade servers, Web sphere 6.1, VCS, VVM, Remedy (Ticket Monitoring Tool),, EMC Storage SAN, Veritas

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