unix senior linux administrator resume example

Responsibilities:
• Supporting Unix environment for the client "The homedepot" consisting more than 30000 servers across datacentre,stores and distribution centres in a high phased distributed environment
• Supporting the Unix environment which runs on different operating system includes Redhat Enterprise Linux 5/6/7 , Centos,ubuntu and AIX on both production and non-production environment.
• Involved in co-ordination with OS and hardware vendors to keep the production system up and stable.
• Performed various activities including Kernel upgrade/troubleshooting , veritas cluster management, Patch Management, fixing security vulnerability (through qualys,crowdstrike,mcafee,tanium), patch compliance check,root cause analysis and created corrective action strategies to mitigate risks.

• Reduced Service now backlog tickets by resolving efficiently and also appreciated for my work
• Priority tickets are being handled through integrated pagerduty with service now (incident management, change management and adhoc request)
• Supported store environment linux servers which runs service like printer(cups) service,DHCP,DNS,Samba,informix DB,Squid proxy,nfs,ntp,ldap,tomcat container,TWS,Maestro.
• Performed IP segmentation, moving DHCP to DNS IP,tcpdump troubleshooting, VLAN/Firewall issue, Loadbalancer ..etc
• Assisted physical server decommission ,Red tagging for linux refresh projects.
• Worked as a linux design engineer for building oracle rac,informix, db2 physical servers, and Virtual build servers to run various applications like kakfa, TMS, COM, splunk,cassandra,SAP basis,hadoop,Tomcat grid, WMS and abinitio.
• Also actively involved in nutanix cluster movement and memory upgradation for the critical graphite application on the physical servers.
• Co-ordination with customer, vendor and various matrix team to get the design and build work completed on the physical & virtual servers until it reaches the final stage.
• Maintained support documentation and created knowledge base articles for continuous improvement.

• Performed data/system backups and recovery during disaster recovery operations.
• Maintain successful current OS and data backups using MNR - Mondo Rescue and TSM/Rubrik on datacenter servers.
• Performed OS deployment through Puppet,spacewalk,HPSA and kickstart method on both physical and virtual servers by coordinating with onsite engineer.
• Performed configuration update on the build servers using puppet tool.
• Perform the security updates for the newly built Linux servers and package installation as per the client requirements.
• Migrated physical to virtual hardware on vmware hypervisor for more than 100 linux servers.
• Worked and co-ordinated with clients in the server build on post deployment tasks which includes Informix,DB2,SAP,oracle RAC configuration on the newly built servers.
• Performed post deployment activities like filesystem creation on multipath, Informix raw filesystem creation, oracle asm disk creation, TSM for oracle, SAP configuration, veritas cluster configuration, NFS configuration, adding new mount points for NAS, mainframe paths, supporting servers for DMZ,PCI environment.
• Performed backup administration and restoration of data through avamar Grid and Mozy client tool with high backup successful rate.
• Successfully lead both Unix server build and Backup/Restore team during my offshore tenure.
• Automated manual efforts in pulling the backup metrics through GUI and as well as our daily activities using bash/python scripting.
• Automated build manual tasks like configuration of files ,filesystem creation, user permission settings using bash scripting language and pushed to all the newly built client servers through SSH key authentication.
• Allocated SAN disk to the newly built physcial linux servers through LUN mapping and scanning from vendors like IBM, EMC