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Linux Systems Administrator Resume

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Rockville, MD

PROFESSIONAL SUMMARY:

  • IT Professional with over 7+ years of experience in Linux Systems Administration with problem solving, analytical and decision making skills.
  • Experience with day to day System Administration tasks like new Builds, Installs, Upgrades, Patches, Migration, Trouble shooting, Security, Backup, Disaster Recovery, Performance Monitoring and Fine - tuning on UNIX / LINUX Systems.
  • Experience in administering Solaris & Linux. Experience in Installation, Configuration, Backup, Recovery, Maintenance, Support of Sun Solaris & Linux.
  • Managing and Installing Solaris S/W on Standalone & Servers.
  • Expertise in file system concepts like LVM, VxVM, creating new file systems, increasing and decreasing file systems, mounting file systems, un-mounting file systems and troubleshooting Disk space issues.
  • Knowledge about device-mapper in SAN environment.
  • Experience in Creating and maintaining user accounts, profiles, security rights, disk space and process monitoring.
  • Experience on Red hat Linux Server & Desktop Environment using through Virtual Machine under VMware and Involved in Design, Planning and Implementing Migration activities to move application from Solaris 9, 10 & 11 to Redhat Linux Environment.
  • Expert in Jumpstart, Kickstart, configuring Bonding in Red Hat Linux, Infrastructure setup and Installation Methods.
  • Experience on various versions of Red Hat Enterprise Linux.
  • Experience in writing version control hooks Python scripts for SVN and GIT repositories
  • Experience in Administration/Maintenance of source control management systems, such as SVN, Perforce, GIT(Distributed Version Control)
  • Installed, configured and implemented the RAID 0/1/5 volume management using VERITAS Volume manager (3.5/4.x/5.0) and Solstice Disk Suite (SVM) on Solaris. Also Experienced in VERITAS file system (3.x, 4.x, 5.0), VERITAS Net Backup (4.x, 5.x, 6.x) for disk management and mirroring tasks.
  • Proficient in System Backup and Recovery from tapes using ufsdump, ufsrestore, tar and cpio and well versed in configuring Volume Groups and Logical Volumes, extended logical volumes for the system growth needs using Logical Volume Manager (LVM).
  • Experience with the team that maintained and developed of MIT’s Kerberos for Windows product including support for GSS-API v2, Kerberos 5 and Kerberos 4 protocols.
  • Worked with Kerberos implementers to improve the single sign on experience when multiple protocol stack implementation co-exist on the same operating system.
  • Familiar with Splunk in creating Dashboards for generating the reports as required by Business and installing and configuring 3.x and 4.x versions on Linux /Solaris.
  • Experience working on High availability (HA) servers configured in Cluster environment. (Redhat cluster, Sun Cluster,HP cluster)
  • Extensive experience in installing, integrating, tuning, and troubleshooting Apache, Tomcat and Sun ONE
  • Experience administration and development with Hudson, Jenkins, and Bamboo.
  • Experience in working with build pipelines, ANT scripts, MAVEN, XCODE and Shell.
  • Experience in working with Puppet Master, Puppet agents. Excellent configuration management using tools such as Puppet, Chef and Ansible for configuration management.
  • Extensive hands on knowledge in Linux Command line, bash and Shell scripting.
  • Strong experience in preparing automated test scripts for integration, user acceptance and regression tests.
  • Experience in installing, configuring, supporting and troubleshooting Unix/Linux Networking services and protocols like NIS, NIS+, LDAP, DNS, NFS, DHCP, NAS, FTP, SSH and SAMBA and also worked on monitoring tools like Cacti, Introscope and Nagios.
  • Familiar with Technical documentation and Change Implementation practices.
  • Experience supporting 24x7 production computing environments providing on-call and weekend support and have an ability to work independently as well as a team member with ability to meet deadlines on or ahead of schedule. Extremely customer focused.
  • ITIL -Incident Management -Problem Management -Vendor coordination -trending analysis -proactive reporting -managing low to high severity incidents end to end
  • Worked on designing and implementing HIPAA compliant data center.

TECHNICAL SKILLS:

Operating Systems: RHEL 4 / 5/ 6, Solaris, SUSE, Ubuntu, IBM AIX, Cent OS, Fedora, OES, HPUX, Windows.

Hardware: - IBM Blade Centers, HP Proliant DL G3, G4 & G5,C7000,C6000,HP BL20,BL 40, Sun Fire Servers: E25k, E15k, 12k, E280R, E480R, V240, 420R, V440, V480, V490, V880, V, E6900 and E2900, Dell Power Edge servers.Data Centre Servers: E250, E450, E3000 and E3500, M4000, T2000, T5120, T5240, T5440, HP rp3410, 3440, rp4440 & rp8400.

Languages: - PERL, C, C++, PHP, JAVA, PL/SQL, HTML, JavaScript, J2EE, JSP, Servlets.

Databases: - Oracle 10g/9/8, Sybase 11.5.1, POSTGRESSQL, MYSQL, MSACESS

Web & Application Servers: Weblogic 10.x/9.x/8.x, Websphere,Apache HTTP/Tomcat/Jboss Server Installation & Configuration; Compiling with Modules; Virtual Hosting; SSL, Loadbalancing & Clusters

Networking: - TCP/IP, DNS, NFS, NIS,SMTP, SSH, DHCP, Cisco Routers / Switches and LAN

Tools: - Veritas Cluster 3.x, 4.x & 5.x, HP MC Service Guard, Redhat Cluster, Sun Cluster 3.2, VMware, VERITAS Netbackup 6.0, VERITAS Storage Foundation Suite, Solaris Volume Manager, Sun Java Studio, sendmail, Nagios,Introscope, Splunk, Urchin, ddm, AM5, cobbler, Webmin, PGP encryption and decryption.

PROFESSIONAL EXPERIENCE:

Confidential, Rockville, MD

Linux Systems Administrator

Responsibilities:

  • Performed installation, configuration and maintenance of Redhat Linux 4.x/ 5.x/6.x
  • Installation, configuration and Operating System upgrade on Sun Solaris 8,9,10, on sun Servers
  • Also excelled on Linux kernel, memory upgrades, and swap area. Redhat Linux Kickstart Installation. Configuring DNS, DHCP, NIS, NFS in Redhat Linux other Network Services.
  • Installation, configuration and Operating System upgrade on Sun Solaris 8,9,10, on sun Servers.
  • Configured and maintained all web servers.
  • Experience in Servers consolidation and virtualization using VMware virtual infrastructure, VMware ESX.
  • Wrote Shell Scripts as cron jobs and deployment scripts for various reasons.
  • Created unit and functional test cases through use of testing tools such as Python and Bash.
  • Mounted Disks allocated from the SAN (Clarion) for Linux and Solaris servers. Installed new and removed bad HBA cards from the server. Moved the Volumes from CX600 to CX700 to increase storage capacity.
  • Network monitoring using NAGIOS, Introscope & Splunk tools.
  • Provided application support for Weblogic application servers as required.
  • Network trouble shooting using ‘ndd’, 'traceroute', 'netstat', 'ifconfig' and 'snoop' etc
  • Installed of all the required Software, patches, documentation, licensing trouble shooting.
  • Troubleshoot network & DNS issues and handled VERITAS Netbackup server & client connectivity problems.
  • Monitored overall system performance, performed user management, system updates and disk & storage management.
  • Configuration of network equipment for newly builds servers.
  • Creating File system and configure to available network through NFS
  • Created users, manage user permissions, maintain User & File System quota on Redhat Linux and Solaris.
  • Implemented puppet to manage all of our existing servers and automate the build/configuration of new servers. Rebuilt existing nagios system to integrate tightly with puppet for automatic monitoring configuration.
  • Production support of Apache and JBoss including installation, configuration, management and troubleshooting
  • Converted and automated builds using Maven and Ant. Scheduled automated nightly builds using Hudson/Jenkins.
  • Worked with the development team to generate deployment profiles (jar, war, ear) using AN
  • T Scripts and Jenkins.
  • Worked with development team to migrate Ant scripts to Maven.
  • Setup of full networking services and protocols on UNIX including NIS/NFS, DNS, SSH, DHCP, NIDS, TCP/IP, ARP, applications, kickstart and print servers to insure optimal networking, application, and printing functionality.
  • Installed and configured Sudo for users to access the root privileges.
  • Used Zone Configuration in solaris10 boxes. Used zoneadm utility to create and maintain the zones. Created many number of zones under the Global zone and setup network for the zones.
  • Designed and implemented a cross-platform Kerberos Identity Management API
  • Designed and implemented Cocoa user interfaces for ticket acquisition (KerberosAgent) and ticket management (Kerberos.app)
  • Assisted in the design of several Kerberos APIs including the Kerberos Login Library (KLL).
  • Wrote Technical documentation for various projects and worked with Technical writer to finalize the documents.
  • Extensive experience in automation framework outlining and script coding.
  • Strong expertise in use of stress testing tools and software testing methodologies.
  • Involved in Backend testing, Functionality and Security testing.
  • Participated in weekly walkthrough and inspection meetings, to know the status of the testing effort and the project as a whole.
  • Executed Python scripts and used the Jenkins continuous integration server to perform server-side tests.

Environment: Redhat Linux 4.x,5.x,6.x; Solaris 8,9,10 VMware ESX Server 3.5.0, Apache & JBOSS, Remedy, EMC Power Path, windows 2003/2007/XP/VISTA/7, Solstice Disk Suite, Enterprise Security Manager, Opsware, Weblogic 8.1, Oracle 10g/11g.

Confidential, Minneapolis, MN

Unix/Linux Admin

Responsibilities:

  • Installation and Configuration of Solaris 10, Red Hat Linux 5, CentOS and IBM AIX operating systems on large distributed environment.
  • Configured, administered and effectively monitored IBM AIX on IBM bladecenter servers and P-series servers.
  • Implemented remote installation on servers using AIX Network Installation Manger (NIM), RedHat Linux Kickstart and Solaris jumpstart Servers.
  • Installed and configured RedHat softwares and 3rd Party tools using RPM’s and YUM on RedHat servers.
  • Installation, Configuration and Maintenance of Samba, Apache Tomcat, Web Sphere and Jboss servers in AIX, Sun Solaris and Linux environment.
  • Administration, Maintenance and Management/Monitoring of Netapp filers/Clusters which includes FAS 2040.
  • Worked on NetApp filers like FAS 3240 & 6070 running DATA ONTAP 7.x.
  • Involved in creating volumes on RAID groups and aggregates and sharing to Windows and UNIX servers using CIFS & NFS.
  • Mainly Kerberos 5 development with a bit of other development that includes Kerberos 5 internal library functionality as well as integration into applications.
  • Worked on scripting using shell, bash and korn.
  • Designing and implementing for fully automated server build management, monitoring and deployment by using DevOps Technologies like Chef, Puppet.
  • Experience working Snapmirror & Snapvaults for backup and replication purposes on NetApp devices.
  • Administrated NFS, NIS, DHCP and DNS Samba services running on AIX, Sun Solaris and Red Hat Linux.
  • Upgraded Red Hat Linux servers from 5.2 to 5.4 and AIX from 5.2 to 5.3.
  • Involved In Migration from Solaris to Red Hat Linux.
  • System performance tuning, User administration and security.
  • Scheduling Backups, Monitoring & taking failover test of Veritas Clustered servers.
  • Monitoring of Tivoli storage logs for restarting any failed backups or trouble shooting any file permission or stale file handling problems.
  • Ability to screen and diagnose client inquiries and problems; troubleshoot to clearly understand problems (root cause determination), solve problems, use operational documentation (runbooks)
  • Responsible for administering and maintaining RedHat Linux work stations running Apache web server.
  • Configured and Administered JBOSS 4.2 on RedHat Linux and Solaris Cluster Nodes.
  • Installed and configures Weblogic 9.1.
  • Installed and Configured VMware ESX 3.5 server and Installed Red Hat Linux servers on top of it.
  • Provided eCommerce application support for Java/J2EE based ATG Dynamo and WebSphere environments.
  • Worked in Data center environment for configuring new Hardware.
  • Coordinate with Business Analysts and Developers to define testing scope.
  • Developed automated test suites and engines.
  • Performed testing, scheduling, maintenance, and database backup/restore.
  • Worked close with the testing team on existing Manual Tests and developed new automated test scripts.
  • Worked closely with the networking team and participated in server installation and basic networking protocols.

Environment: IBM AIX 4.3,5.1,5.2,5.3,Solaris 8/9/10, Red Hat Linux 5.x,CentOS, IBM Blade center Servers (HS20, HS21), Lenovo workstation’s (D2, D3, D10, D20), IBM P570, p590, 595MQSeries 5.0

Confidential, Kansas City, MO

Linux Systems Administrator

Responsibilities:

  • Installation, Configuration and upgrade of Redhat Linux (2,3,4,5), CentOS, SUSE, Solaris, HP-UX & Windows /2008 Operating System.
  • User Administration, management and archiving.
  • Configuring NFS, NIS, NIS+, DNS, Auto Mount & Disk Space Management on SUN Servers.
  • Experience in Configuring and Managing Virtual Disks, Disk Mirrors & RAID Levels.
  • Worked with OVF "Open Virtual Machine Format" supported tools VirtualBox, Redhat Virtualization (XEN), and VMware Workstation.
  • 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, Sun Solaris and Linux environment.
  • Experience in Active directory configurations and support.
  • To provide ongoing support in systems management and administration of LINUX/UNIX in global-scale environment.
  • Performed daily backups, restoration of data as per requests from developers using Veritas Netbackup.
  • Veritas File system and Veritas Volume Manager 2.5 are used to configure the RAID 1 and RAID 5 Storage Systems
  • Installation and configuration of backup clients like Avamar and Veritas Net Backup on Linux servers.
  • Experience working with HP Openview client and server configuration.
  • Experience in writing scripts to automate jobs and debugging scripts.
  • Experience in using protocols like NIS, NFS, SSH, SFTP, LDAP & DNS.
  • Dealt with Linux Utilities: KICKSTART, SSH, FTP, AUTOFS, Quota Management, wrappers.
  • Installation of Firewall checkpoint. Installed and configured IPFilter, to protect Linux system that was placed on the Internet.

Environment: Redhat Linux 2x,3x,4x,5x;CentOS,SUSE,Solaris 8,9,10,Windows 2000/2003/2008 VMware ESX Server 3.5.0, Apache, JBOSS, Samba, web sphere, Avamar, VMware ESX 5.1, oracle 11, Veritas Cluster Server 5, Veritas Operations Manager.

Confidential

SME/Linux Admin

Responsibilities:

  • Configured IBM RS 6000 for production, staging and test environments.
  • Installation and configuration of Red Hat Linux and NT servers.
  • Installation of patches, security fixes, e-fixes, packages on AIX, Sun Solaris, Linux and Windows NT/2000 Servers.
  • Update latest patches and upgrade all applications to the latest versions.
  • Configuring Windows 95, 98 and NT workstations in NT domains
  • Setup LAN consisting of ten RS-6000 Servers running AIX 4.3, 5.0, 5.1, and five Solaris Servers.
  • Maintained the local Apache web server running on a Solaris server.
  • Supporting the network on connectivity issues relating to TCP/IP, IPX, and AppleTalk.
  • System Administration and engineering of Windows NT\2000, Active Directory Administration.
  • Administering user accounts: Adding users, user-groups, removing users & groups and changing user environments.
  • Migrated database applications from Windows 2000 Server to Linux server.
  • The primary responsibilities of the job include monitoring all the Windows NT servers verify
  • Everything in sync and at optimum performance and take proactive measures to reduce the Downtime.
  • Troubleshooting of DNS and DHCP related problems.
  • Produce proactive reports, trending analysis, service level reporting, process consultation and application of ITIL best practice.

Environment: Red Hat Linux 3.0, IBM AIX 4.3.3, SUN Solaris 2.6, NT/2000, MS Operating System, DHCP, DNS, Apache, User Management, Network Management

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