SUMMARY:

• 8 years of intensive and detailed oriented Linux System Administrator/Engineer work, with an excellent back - ground in a wide variety of professional system support and solution-based IT services for Linux and Windows systems/server administration.
• Experienced in administering and managing system in multiplatform/multivendor environment consisting of both physical and virtualized environments by incorporating best practices in the IT industry.

TECHNICAL SKILLS:

Software/Technologies:

• RedHat
• RHEL Satellite Network
• HP Service Manager
• IBM BigFix
• Kickstart
• RPM Package Building Tools
• Linux Clusters
• Ansible
• Puppet
• Bash
• Ruby
• PHP scripting
• Open SSH protocols
• SFTP
• VMware vCenter
• VSphere
• VCS Veritas
• Backup Exec
• LVM
• Nagios
• PRTG
• LibreNMS
• Cacti
• Wireshark
• New Relic
• Grafana
• MySQL
• PostgreSQL
• MS Sql
• Apache
• Tomcat
• Jetty
• Nginx
• DenyHosts
• OpenVPN
• DNS
• DHCP
• SVN
• Git
• Cloudera Manager
• Ganglia
• Catchpoint
• DynDNS
• FreeIPA
• JIRA
• Hipchat
• Confluence
• Bamboo
• Jenkins
• Foreman
• Synology
• PfSense Firewall
• Juniper Firewall

Experience with server virtualization, Load-balancing, High availability and clustering technologies including Amazon AWS.

Amazon AWS’s: IAM, VPC, S3, EC2, RDS, DynamoDB, SNS, Route 53, CloudWatch, Lambda

Operation Systems:

Redhat RHEL/Centos 5, 6 and 7 Ubuntu Solaris Windows XP Vista 7 8 10 Server 2000 Server 2003 Server 2008 Server 2016 Mac OS VM ware ESX and ESXi Citrix XenCenter KVM AWS

PROFESSIONAL EXPERIENCE:

Confidential, Bethesda, MD

System Administrator/DevOps

Responsibilities:

• Fixed multiple redundancy issues using Redhat’s clustering technology (Pacemaker and Load Balancing)
• Completely Automated new server deployment with Foreman and Ansible
• Configured an automated Version control using Puppet
• Built a fully redundant Virtual environment using Hyper-V failover and redundant Synology storage
• Migrated all virtual machines from unpractical KVM onto Hyper-V
• Migrated multiple physical machines onto Hyper-V
• Implemented new Monitoring solutions (Grafana for Postgres databases; Libre NMS; PRTG )
• Implemented Hipchat as a replacement for outdated Spark by building an On-Site Server and making it front-facing
• Implemented Jenkins, moved a big chunk of Php scripts onto it making them visible and easy to control
• Rebuilt current front facing DMZ making it redundant using Redhat’s pacemaker and more secure by port and firewall tuning
• Worked with Juniper and PfSense Firewalls (Configured and tuned multiple Policy rules)
• Started Working on the creation of an AWS failover environment for clients Web Servers.
• Built an AWS environment consisting of 4 Availability Zones, 8 subnets (4public and 4 private, one per each client) each with an ELB in front and an Autoscaling group for 4 redundant EC2 containers running front-facing client’s Web Servers.
• Wrote a script that triggers the AWS’s auto-scaling mechanism in case we lose 3 of our 4 on-site client’s web servers.
• Took part in an ON-SITE Disaster Recovery creation with Automatic Failover
• Overall datacenter maintenance (Patching, troubleshooting, replacement, built etc.)

DevOps Engineer

Responsibilities:

• DevOps Focus - automation, integration, orchestration via software defined environment
• Responsible for monitoring the network, including bandwidth billing, CPU, memory, file system utilization as well as processes and making sure any custom monitoring solutions are placed in New Relic.
• Held Access Privileges and performed hands-on maintenance of Lotame Solutions equipment at the Net Data Center IAD4 and IAD6 facilities in Ashburn VA
• Wrote numerous bash scripts to perform various tasks (custom Nagios checks; auto scale triggers, log rotation)
• Production experience with version control tools such as SVN and GIT and configuration management tools.
• Helped manage internal and external DNS domains for use with clients and internal services.
• Took part in the On-call rotation.
• Took active part in the Rebuild process of the new Dev and QA environments.
• Configured Nagios and wrote custom Nagios checks.
• Production experience with Chef and Puppet automation tools for system-wide configuration and management of Linux servers.
• Built custom Puppet modules. Wrote custom manifests
• Worked with Hadoop including Cloudera Manager
• Set up a backup and restore solution for Jira/Confluence
• Worked with AWS’s EC2, RDS and Auto scale. Configured AWS environment as a way of failover for our clients servers and as a way to release the load from our physical boxes
• Set up and configure FreeIPA server as a replacement for Windows’s Active Directory

Systems Administrator/Engineer

Responsibilities:

• Installed, configured, hardened and troubleshoot Linux based environments (RHEL).
• Administered and tuned application stacks (Jetty, NGINX, MySQL and Jenkins).
• Designed and managed working AWS environments.
• Took active part in the AWS migration.
• Managed VMWare environments. Spinned up new VM’s, managed VMWare’s HA and
• Monitored and tested application performance for potential bottlenecks, identified possible solutions, and worked with developers to implement bug fixes (New Relic, Atlassian JIRA and Confluence).
• Managed system routine backups, enabling cron jobs, configuring system logging, and network logging of servers for regular maintenance.
• Setup Virtual Linux test labs and clones for developers and engineers using VMware.
• Worked with automation software (Puppet, Chef), including installation and configuration
• Wrote and maintained custom automation scripts to increase system efficiency and lower the human intervention time on any tasks (Shell and Ruby).
• Maintained all technical support department documentation, for installations, deployment, and configuration manuals.
• Configured and performed troubleshooting for basic networking connectivity including TCP/IP, DHCP and DNS.
• SSL configuration, hardware/software tuning, patching/upgrades.
• Support of ECHO360’s in-house applications.

System Administrator

Responsibilities:

• Managed vSphere ESXI clusters and virtual machines using VMware vCenter with enterprise features such as High Availability (HA), vMotion, Distributed Resource Scheduler (DRS) enabled.
• Managed ESXI host and VMware Virtual machine upgrade as required.
• Hands on experience in installation, configuration, supporting and managing Hadoop Clusters using Apache, Cloudera (CDH3, CDH4), Yarn distributions.
• Maintained overall Datacenter Redundancy based on VMware cloud offering between two SSA Datacenters in Durham, NC and Woodlawn, MD.
• Kickstarted both Virtual Server and bare-metal installation of RHEL6 and CentOS servers.
• Configured RAID and Create LVM partitions on Dell PowerEdge 11th and 12th Generation Servers.
• Installed Apache webservers, created v-host and sync required databases.
• Setup Munin and Cacti server to monitor systems metrics such as uptime, services and file systems, disk usage, CPU utilization, memory stats.
• Deployed servers using RedHat satellite profiles spacewalk, registered machines to ensure up-to-date servers.
• Setup and configured SSH File Transfer Protocol (SFTP), VSFTP and other protocols.
• Linux admin daily task such as user management, Cron jobs, backups, ticket resolution, troubleshooting and updating application patches.
• Managed and configured RPM package building tools to perform custom builds and patching of applications from source code for Centos and RHEL systems.
• Managed system routine backups, enabling cron jobs, configuring system logging, and network logging of servers for regular maintenance.
• Follow upgrade roadmap involving installation/upgrades of server’s hard drives and memory.
• Installed and configured intrusion detection systems such as DenyHosts for log analysis, file integrity checking, real time alerting and brute force attack prevention.
• Troubleshoot and fixed NFS, TCP/IP and other protocols problem.

System Administrator Moldova

Responsibilities:

• Installed operating systems, patches, hardware, vendor software packages, system customization and documentation of Red hat Linux, Centos and Windows 2000/ 2003 servers.
• Diagnosed and resolved customer connectivity issues in RHEL 5 & 6 servers.
• Configured, managed, and troubleshot the network interface.
• Image servers and client computers to remotely manage their software after deployment on RedHat Linux 5 & 6.
• Scheduled Cron jobs to automate regular jobs.
• Installed hardware, software, and upgraded to ensure work is performed as per the university policy on various hardware platforms.
• Performed user account management and administration, such as, troubleshooting user’s login and home directory related issues.
• Built servers with jumpstart using Kickstart, CD on timely basis, according to university requirements.
• Installed and configured Security Services like SSH, SSL, TCP Wrappers on Linux Servers.
• Configured auto mounts/maps for the user accounts and groups.