We provide IT Staff Augmentation Services!

Linux System Administrator Resume

Coppell, TX

SUMMARY:

  • 5+ years of experience with RHEL/CentOS/Ubuntu, Solaris, Oracle Linux and AIX system administration in an enterprise environment.
  • Extensive experience in Linux/Unix system Administration, System Builds, Server Builds, Installations, Upgrades, Patches, Tuning, version control, Migration, Troubleshooting on RHEL/CentOS 5.x,6.x,7.x
  • Experience in configuring Red Hat Linux 5.x, 6.x, 7.x using kickstart (with FTP, HTTP, and NFS.), and interactive installation.
  • Experience in administering VMware ESX Infrastructure, vSphere Client 6.1.0
  • Experience building Linux virtual infrastructure using KVM, XEN and VMware ESX.
  • Experience on AWS services like EC2, S3, RDS, ELB, EBS, VPC, Route53, Auto scaling groups, Cloud watch, Cloud Front and IAM for instantiating, configuring and managing various Amazon images for server migration from physical servers into cloud.
  • Experience working in large data center environments (300+ Linux/Unix Servers)
  • Ability to manage SCM processes which include compiling, packaging, deploying and application configurations.
  • Worked with Version Control Systems SVN (Subversion), GIT and IBM Rational Team Concert.
  • Experience in Installing, configuring Ansible on Linux, Unix clients, creating new profiles, creating modules, running checks, modifying scripts, pushing changes to the clients.
  • Experience developing and implementing continuous deployment code; experience with CI/CD (Jenkins) pipelines and DevOps methodologies.
  • Experienced in implementing and maintaining an Apache 2.4, Tomcat7, WebLogic 10.x, WebSphere, JBoss, JAVA, J2EE, SQL/ MySQL, PHP, LDAP, LAMP , nginx web service environment.
  • Experience in Installation and Configuring domains for Fusion Middleware like SOA and OSB server.
  • Expertise in Installation, Configuration, Integration, Tuning, Backup, Crash recovery, Upgrades, Patching, Monitoring System Performance, System and Network Security
  • Experienced with the installation, configuration and volume/File system management using VERITAS Volume Manager, Logical Volume Manager ( LVM ).
  • Experience in implementing and monitoring High Availability environment using Red Hat Cluster, Veritas Cluster Server.
  • Proficient in Networking and configuring TCP/IP, DNS, NFS, SAMBA, LDAP, SSH, SFTP, SMTP, SNMP.
  • Expert in Installation, configuration of Patches and Packages.
  • Proficient in installation and configure file systems such as EXT, and software RAID managers such as Logical Storage Manager.
  • Experience in Installation, configuration and troubleshooting various web server issues including IBM HTTP Server, Apache Web Server, Tomcat 3.x.
  • Experience in installing, configuring, and implementing of RAID 0, RAID 1 levels using Logical Volume Manager, VERITAS Volume Manager
  • File system - organization, mounting, file types, permissions etc.
  • Experience with backup technologies like Tivoli Storage Manager 5.x and Veritas Netbackup 3.x
  • Expertise in Administering and support Windows Active Directory, DNS, DHCP, WINS, SharePoint, OCS, Office365, LYNC, Microsoft.
  • Proficient in configuring the Data Communication Devices such as Routers, Switches, Hubs, Terminal servers and Troubleshooting LAN and First Level WAN Related Problems.
  • Experience in Web developer using tools as HTML, CSS, JavaScript and PHP
  • Self-motivated, Strong in troubleshooting, monitoring, training and 24/7 production support in mission critical environments, able to set effective priorities to achieve immediate and long-term goals and meet operational deadlines. Able to work independently and as team member.

TECHNICAL SKILLS:

Hardware: SUN Enterprise, IBM/HP/DELL Blade Servers, SAN (EMC, Hitachi), NAS (Netapp)

O / S: Red Hat Linux (RHEL 5/6/7), Solaris 11.1/11.2/11.3, HP-UX (11.00, 11.11, 11.23, 11.31), IBM AIX (5.1, 5.3), Windows

Automation: Ansible, Puppet

Backup Management: Veritas Netbackup 4.x/5.x/6.x, Ufsdump, ufsrestore, tar, dd, cpio

Script Languages: Shell scripts, Python, Ansible

Web Technologies: Apache 2.x/3.x, WEBLOGIC 8, Websphere 4.0/5.0/6.0

ThirdParty Software: VERITAS Volume Manager, LVM , LDAP, SSH

Cluster: Veritas Cluster Server (VCS) , Sun Cluster, HP Service Guard, AIX HACMP

RDBMS: Oracle, MS SQL Server

Protocols: NetBIOS, NetBUI, SMTP, SNMP, ICMP, TCP/IP, FTP, TELNET, UDP & RIP, DNS, WINS, DHCP.

Virtualization: VMware ESX Server, VMware workstation, VirtualBox, OVM Servers.

Network Services: SMTP, SNMP, SSL, DHCP, POP, HTTP, SMB, NIS, NIS+, NFS, SFTP, DNS, FTP/TFTP, LDAP, JDBC, ARP/RARP, SSH, TCP/IP, WEBSM, NAT, NTP, TELNET.

Cloud Computing: Amazon Web Services(AWS), Openstack

PROFESSIONAL EXPERIENCE:

Linux System Administrator

Confidential, Coppell, TX

  • Installation, configuration, maintenance, Administration, and support on Redhat Linux, Ubuntu, CentOS.
  • Built both physical and virtual Linux servers (RHEL 6/7, CentOS, Ubuntu and Oracle Linux) in all environments, system test, appdev, staging and production using VMware, VirtualBox and OVM.
  • Image machines using Jumpstart / Kickstart to install Red Hat Enterprise Linux, Ubuntu, and CentOS.
  • Developed Ansible Playbooks and used Ansible for configuration management for application deployments & workload streamlining.
  • Determined appropriate remediation steps to apply based on the security vulnerabilities that have been identified.
  • Performing quarterly/monthly patching, automated the patching process using Ansible. Created quarterly and monthly Clones in RedHat Satellite and registered severs for patching so the servers can be on the same patch level.
  • Patched Oracle Linux, RedHat Linux, Ubuntu, CentOS servers.
  • Tested the Linux security patches packages before deploying them into production environment.
  • Installed and updated third party application RPM s.
  • Troubleshoot Linux OS in case if the server is not up and running after the reboot after applying patches.
  • Ensured server patching is occurring in accordance with established security policies while minimizing impact to business processes.
  • Automated the application installation after building the VM with Ansible. Installed SCOM agent, Trend Micro and Trend Deep Security Antivirus Agents, NetBackup on RedHat Linux and Windows Servers.
  • Setting the static IP Address on a spun up VMware machine using Ansible playbook.
  • Automated server registration to RedHat Satellite with Ansible.
  • Build and Implemented Ansible Tower to manage all existing servers and automate the build/configuration of new servers. Managed Linux Clusters.
  • Developed Ansible Playbooks to perform user and group management.
  • Developed Ansible Playbooks to deploy PAM radius (multi - factor authentication) on Linux servers.
  • Developed Ansible Playbooks to deploy Splunk forwarders on Linux servers.
  • Involved in Performance Tuning, Backup, and Crash recovery, Upgrades, Monitoring System Performance, System and Network Security of the servers.
  • Tune system software for peak performance and availability.
  • Performed Memory and Swap management to improve optimization and performance of the servers.
  • Wrote Ansible Playbooks and shell and perl scripts to automate redundant day-to-day jobs.
  • Implemented and maintained server virtualization using VMware ESXi, KVM and Oracle Virtual Manager
  • Hardened the servers to prevent attacks, hacking and generating SSH authenticating keys to secure the environment.
  • Configured local firewall and managing IPTABLES and setup high availability HAProxy.
  • Managing sudo permissions, Active Directory changes.
  • Recover deleted Active Directory objects using the backup from Recovery Manager for Active Directory (RMAD)
  • Trouble shoot Active Directory replication issues.
  • Regular disk management like adding and replacing hard drives in existing servers and workstations. Creating partitions according to requirements, creating new file system or growing existing one over the hard drives and managing the file system.
  • SAN administration and logical partitioning.
  • Providing SAN support including zoning and LUN provisioning, troubleshooting, capacity planning and reporting.
  • Configuration, administration and management of external storage (SAN/NAS).
  • Performed all LVM and file system tasks like creation of Logical volume and file system, mount a file system, modifying size of a Logical Volume and file system, removing a file system.
  • Install, configure and renewal SSL certification for site.
  • Responsible for maintaining the integrity and security of the enterprise UNIX Linux servers and system.
  • Monitored system logs, monitored system resources for better performance by using monitoring tools (top etc.).
  • Maintained DNS, NFS, and DHCP, printing, mail, web, and FTP services for the enterprise.
  • Worked on User administration setup, maintaining account, Monitor system performance.
  • Deployed Splunk forwarder agents on Linux servers and worked on Splunk configuration and log/event management.
  • Forecast storage needs. Work with the site management to determine future disk requirements.
  • Worked with the application teams and other IT department personnel to coordinate system software changes and support application changes.
  • Installing, configuring and maintaining Oracle 10g / Oracle 10g RAC and Oracle 11g DB servers.
  • Configured and troubleshooted NFS, NIS, NIS+, DNS, DHCP, FTP, LDAP, and Samba, Apache servers.
  • Configured Sendmail, Postfix, Exim etc
  • Installation, configuration and management of LAMP (Linux/Apache/MySQL/PHP) stacks and nginx.
  • Configure, maintain and troubleshooting Samba Servers in navigating to Linux directories from windows.
  • Troubleshooting the network issues and response problems.
  • Storage allocation for users across filers/volumes on site without over-allocating disk space.
  • Worked on IP protocol suite, specifically relating to the applications and services that utilize these protocols: SSH, NTP, DNS, SMTP, HTTP, SCP, FTP.
  • Installation configuration and management of Veritas NetBackup, ZFS, LVM.
  • Setup NIC bonding for servers with critical information.
  • Worked closely with the Networks and Security Team in opening firewalls and DNS requests required for the infrastructure.
  • Provide off shift on call support for system support.
  • Provided 24x7 on call and remote support for UNIX Production Problems and responding to user's tickets.

Environment: RHEL 6/7, RedHat Satellite, Ansible , Ansible Tower, VMware ESXi, VirtualBox, OVM, SCOM, NetBackup, Trend Deep Security Antivirus, Splunk, LDAP, Active Directory, Apache, Shell Scripting

Linux System Administrator

Confidential, Louisville, KY

  • Interact with client to help resolve and troubleshoot their day - to-day issues.
  • Build servers (Linux/Windows) using AWS which includes importing necessary volumes, launching the EC2 instance, creating security groups, auto-scaling, load balancers, Route 53 and SNS as per the architecture.
  • Installed RedHat Virtualization Linux Service using kickstart .
  • Involved in Installation, Configuration, Integration, Performance Tuning, Backup, and Crash recovery, Upgrades, Patching, Monitoring System Performance, System and Network Security of the servers.
  • Applying patches to Linux OS, CentOS, Ubuntu, Oracle Linux. Automated patching with Ansible and RedHat Satellite.
  • Installed and updated third party application RPM s.
  • Performed RPM and YUM package installations, Change Management requests for software releases, patches.
  • Configured DNS, NFS, FTP, Apache, HTTPS, DHCP remote access, and security management.
  • SSL certificate installation and configuration, Mail server (SendMail) Management
  • Installed and configured Logical Volume Manager - LVM and RAID
  • Involved in Storage management, LVM, File system management, User account management, data backups and user's logon support.
  • Involved in setting up and configuring WebLogic cluster for multiple environment.
  • Installing and Configuring LAMP (Linux, MYSQL, PHP)
  • Monitor DHCP and DNS servers for resource usage, CPU usage, RAM usage, disk IO and network IO.
  • Assisted in resolving hardware issues and network connectivity issues related to TCP/IP.
  • Performed cross platform audits of, Active Directory (AD) objects and user permissions.
  • Monitor SCOM alerts for, Active Directory replication errors, DNS errors and pending domain controllers reboot.
  • Setup and Configured Red Hat Satellite and kick-start Servers for Red Hat Enterprise Linux/CentOS 6/7 installs and RPM Push updates.
  • Created and maintained user's accounts, profiles, security, rights disk space and process monitoring.
  • Managed systems routine backup, scheduling jobs, enabling cron jobs, enabling system logging and network logging of servers for maintenance.
  • Implemented Ansible to manage all existing servers and automate the build/configuration of new servers.
  • Writing playbooks for Ansible and deploying applications using Ansible.
  • Designed, Installed and Implemented Ansible configuration management system.
  • Used Ansible to manage Web applications, Environments configuration Files, Users, Mount points and Packages.
  • Develop and Maintain documents, library, and procedural documents of the system
  • Management of user accounts, files, and directory permissions, and securing systems to match industry best practices
  • Provides system administrative support for servers and workstations;
  • Software and hardware upgrades and routine systems maintenance by installing current Patches and Packages
  • Utilizing SAR, Netstat, Iostat and Vmstat for performance analysis, tuning and capacity planning, problem prevention, detection, and resolution
  • Administers VMware Infrastructure Client 3.5 and vSphere 5.5.
  • Responsible for LAN/WAN and VMware ESXi Administration and Management.
  • Maintain a high level of server based security utilizing SELinux, IPTABLES, editing Linux kernel modules and parameters, along with Splunk agent deployment, and periodic vulnerability scans with port scan.
  • Monitor multiple applications via keynote, Dash, App dynamics to help check critical alerts and troubleshoot them.
  • Maintain and support day-to-day data center operations such as Single Sign-On w/LDAP, Active directory.
  • Backup and restoration of Progress Database servers using SQL scripts.
  • Build development RHEL Linux server including WebSphere Application servers, Apache/IIS webserver, MySQL and Perl based solution to assists developers.
  • Ticketing and Workload Management - IBM Service Now
  • Load Balancing Technologies - F5 Works with Database administrators to tune kernel for Oracle installations.
  • Trouble shooting various SQL server 2012/2008 Database connectivity issues from the web applications.
  • Creating Database users, roles, profiles, alert logs/ trace logs on Oracle Database application boxes and troubleshoot the issues by checking the error log files.
  • Configured and Supported Apache Tomcat on Linux production servers
  • Automate tasks using Python, Perl, Shell Scripting.
  • Provided 24/7 technical support to Production and development environments

Environment: RHEL 6/7, SQL, RedHat Satellite, AWS , GIT, Jenkins, Ansible , VMware ESXi Splunk, IBM Service Now, LDAP, Active Directory, WebSphere, Apache, F5, Python, Shell Scripting

Linux/Unix Administrator

Confidential, New York, NY

  • Administration of RHEL 6.x which includes installation, testing, tuning, upgrading and loading patches, troubleshooting both physical and virtual server issues.
  • Installed and Configured Multiple OS using VMware ESXi on Dell using Virtual Center Server and VI client.
  • Installed Red Hat Enterprise Linux over the network using Kickstart Installation.
  • Installation of patches and packages using RPM and YUM in Red hat Linux and Suse Linux.
  • Deployed Openstack Kilo in a mutil - node architechure manually.
  • Automation of deployment of OpenStack(Kilo) services using shell scripts for Centos 7.
  • Using of Storage capabilities of OpenStack like Swift and Cinder backed by multiple NAS storage.
  • Implemented the functionality of choosing a particular availability zone in a cloud environment and deploy a VM directly into that zone in OpenStack.
  • Auto scaling the instances to design cost effective, fault tolerant and highly reliable systems.
  • Installed, configured and supported Windows and Linux servers, including Active Directory authentication for Linux servers via Samba and Winbind.
  • Creating volume groups, logical volumes, extending logical volumes based on the requirements using Logical Volume Management (LVM), SVM, ZFS & VERITAS commands.
  • Set up user and group login ID's, printing parameters, network configuration, password, resolving permissions issues, user and group quota.
  • Install and configure DHCP, DNS, web (Apache, IIS), mail (SMTP, IMAP, POP3), and file servers on Red Hat Enterprise Linux servers
  • Configured and troubleshooting NFS, NIS, DNS, DHCP, FTP, LDAP, and Samba, Apache servers in Linux Servers.
  • Configured the systems for TCP/IP Networking with the existing LAN, Setting up SSH and SCP.
  • Troubleshooting and configuration of Local and Network based printers. User, Group Administration and Advanced File Permissions.
  • Handled installation, administration and configuration of ELK (Elastic, logstash, kibana) stack on AWS and performed Log Analysis.
  • Monitored system performance using sar, prof, vmstat, iostat, netstat, Nagios.
  • Performed troubleshooting of various bottlenecks including those found in the CPU and memory using system and network monitoring tools.
  • Troubleshooting Linux network, security related issues, capturing packets using tools such as IPtables, firewall, TCP wrappers, NMAP.
  • Installed and configured VERITAS Net Backup and Tivoli storage manager on Red Hat Enterprise Linux .
  • Monitoring system resources, logs, disk usage, scheduling backups and restore using Nagios and VERITAS Net backup
  • Implemented and monitored clustering on SPARC servers using VERITAS Clustering.
  • Supported DNS, OpenLDAP and Performed User Account creation, assigning access permission, creating user quota by using Shell scripts.
  • Running SQL queries on Oracle and MySQL.
  • Improved Performance of the database by creating Clustered and non-clustered Indexes and by optimizing the T-SQL statements using SQL profiler.
  • Provided 24 X 7 dedicated supports for SQL Server production server.
  • Installation, configuration and management of Oracle 11g,12c & MySQL database servers.
  • Automated daily tasks using Shell scripting to export/import database backups from RDS & keep the same in S3 ( AWS Storage).
  • Backed up MySQL databases with mysqldump, Bash scripting, and CRON jobs.
  • Managed SSL certificate purchasing, renewals, and installations.
  • Worked on SAN storages like Netapp, emc, vnx.
  • Tuning the kernel parameters based on the application/database requirement.
  • Creation of bash scripts to Automate certain daily Processes
  • Designed and developed automation test scripts using Perl, Shell and Python.
  • Created project report and wrote technical document for various projects.

Environment: RHEL 6.x, AIX, SQL, Openstack, ELK, Veritas, OpenLDAP, VMware ESXi, Web Logic, Shell Scripting, Python, Net Backup, CommVault, SAN, Nagios

Linux/Windows Administrator

Confidential

  • Installed and configured Linux/CentOS and Oracle Servers.
  • Installed and configured VMware ESX server instances for virtual server setup and deployment.
  • Responsible for creating VMware virtual guests running Solaris, RedHat Linux, Windows.
  • Installation of Redhat Linux OS/Windows OS kickstart, setting up of Various Firewall (Ipatables, WatchGaurd, checkpoint Firewall) configuring basic rules for logging in to syslog server, MySQL/Oracle.
  • Monitoring and Managing use of disk space, connections, Analyzing, and troubleshooting the SQL Server processes and jobs
  • Administered, monitored RHEL and Windows servers (2008, 2008 r2, 2012, 2012 r2).
  • Proficient in Windows 2000/2003/2008 server upgrade, Wintel server and active directory administration
  • Supporting Windows Cluster server running 2 - 4 nodes on Windows 2003/2008 & 2012 supporting applications like web servers, SharePoint and Active Directory environment.
  • Applying OS patch and upgrade in a multi-platform (RedHat/Ubuntu/Windows) on a regular scheduled basis
  • Setup and maintained NFS and TCP/IP network, configured the systems for TCP/IP Networking with the existing LAN, setting up SSH and SCP features between SUN systems and other Red Hat/UNIX hosts.
  • Configuration and administration of LDAP, NFS in Linux and implemented Samba for sharing of resources between Linux and Windows environments.
  • Deployed RedHat Satellite Server with custom repositories to provide a stable management solution for the Linux environment.
  • Install and configure DHCP, DNS, web (Apache, IIS), mail (SMTP, IMAP, POP3), and file servers on Red Hat Enterprise Linux servers
  • Involved in Storage management, LVM, File system management, User account management, data backups and user's logon support.
  • Installation, configuration, support and security implementation on following services: DHCP, SSH, SCP.
  • Configuration and administration of NFS and Samba in Linux and Solaris.
  • Worked on Web servers; Tomcat & Apache Server
  • Linux kernel, memory upgrades and swaps area and performed Red Hat Linux Kick start installations
  • Automated system management tasks like user account creation, file system size monitoring, monitor system resources and system maintenance using Shell and Perl scripts.
  • Network trouble-shooting using 'netstat', 'ifconfig' and 'tcpdump' etc.
  • Configuring IP connectivity, routing, checkpoint firewall and network interfaces. Also maintaining network connectivity of servers.
  • Implemented Network File System (NFS) for file sharing and network installation
  • Implementation of Samba to help printing and file sharing in the mixed Environment
  • Day to Day activities included handling Security issues like stale UNIX account Cleanups, 90 day password changes, setting max age and min age, creating a list of umask permission for various users and troubleshooting, Patching, Upgrades and Back-ups when required
  • 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.
  • Providing software support to corporate users of Symantec Antivirus and security products

Environment: Red Hat Enterprise Linux/CentOS 5/6, Oracle 10g, VMware ESX 5.x, Weblogic, VERITAS Cluster Server, LVM, MS Windows 2008 server, Symantec Antivirus, PowerShell, Bash, PowerPoint, ITIL

Hire Now