Sergei Kolodeznykh
Verified Expert in Engineering
Systems Engineer and Developer
Novi Sad, Vojvodina, Serbia
Toptal member since March 21, 2024
Sergei is an infrastructure and operations engineer with 14 years of experience supporting high-load, Unix-based services running in virtual infrastructure and bare metal servers. He worked with open-source clustered DBMS like Percona, storage services like NFS and GlusterFS, propriety storages like Acronis and NetApp, and HPC clusters like Bright Cluster Manager, UGE, and Slurm. With 25 years of systems administration experience, Sergei also builds and supports Linux and Windows-based LANs.
Portfolio
Experience
Availability
Preferred Environment
Linux, Bash, Python, Ansible, Jenkins, HPCC Systems, Networks
The most amazing...
...thing I've developed is an automatic process for replacing failed drives in Acronis storage clusters.
Work Experience
Systems Engineer
EPAM Systems
- Wrote scripts for high-performance file system (HPFS) snapshot management and automatic snapshot rotation.
- Refactored from Puppet to Ansible code, configuring compute node images for various roles.
- Supported and improved a system for provisioning Linux scientific workstations using Chef, Cobbler, and Kickstart.
- Participated in all standard level 3 data center operation activities, including dispatches, on-calls, issue investigation, and planned or urgent maintenance.
- Interacted with vendors like Dell, HPE, and Mellanox to support customers' server hardware.
Senior Systems Engineer
Acronis
- Created and organized a system for automatic hard drives replacement across all major storage clusters worldwide.
- Built tools and systems for automatic storage cluster provisioning, configuration, and deployment for bare metal servers and thousands of hard drives.
- Developed tools for everyday storage cluster management used by a team of system administrators.
- Designed tools and wrote code for configuring and supporting internal VPN services. Supported these services for internal cloud and storage teams.
- Engaged in all standard level 3 operations activities, including monitoring, on-calls, fixing issues, solving tasks from customers and internal teams, software or hardware maintenance and updates, and interacting with network and developer teams.
- Supported all server hardware, interacting with vendors and multiple data center on-site teams.
System Administrator
Litres
- Supported the website infrastructure of three data centers and 80 blade and single servers. Handled the Percona database, Apache/mod_perl, nginx/FreeBSD/CARP, network switches, DNS in BIND9, NFS storages with GlusterFS, and ESXi.
- Handled BGP and OSPF routing with Quagga, three network uplinks, and my autonomous system.
- Developed and supported a configuration management system for automatic server deployment based on Puppet.
- Maintained all servers and network hardware, assembled Supermicro Twin Blade systems from components, and installed and configured 1-2 racks of data center presence points from scratch, including all cabling and managing electrical equipment.
- Sustained all office infrastructure for around 80 employees, including a rack of servers and VoIP/PBX systems, physical LAN cabling, WiFi access points, and 1 – 2 floors of Windows and Mac workstations.
- Administrated the Google Apps system for office employees' email system.
Experience
Workflow for Automatic Failed HDD Replacement on Storage Clusters
Education
Partially Completed Degree in Mathematics and Computer Science
Moscow State University - Moscow, Russia
Skills
Libraries/APIs
OpenLDAP
Tools
Bitbucket, VMware vSphere, Ansible, Jira, Confluence, OpenVPN, NGINX, Postfix, VMware, Chef, Jenkins, Zabbix, Puppet, Splunk, Grafana, Git, Keepalived, Cacti, Nagios, Subversion (SVN), Quagga, Squid
Languages
Bash, Perl, Python, Groovy
Platforms
Linux, Linux RHEL/CentOS, Linux CentOS 7, Percona, Ubuntu, Windows Server, Windows, Red Hat Linux, Unix, KVM, PagerDuty, Apache2, FreeBSD, Xen, Debian
Storage
Acronis Cloud Storage, MySQL, GPFS, NetApp, GlusterFS, SUSE
Paradigms
Samba
Other
System Administration, Programming, HPCC Systems, BIND9, DNS, Computer Science, Networking, Cluster Management, Univa Grid Engine (UGE), Slurm Workload Manager, NFS, InfiniBand, Cobbler, ServiceNow, Prometheus, PXE, IPMI, HAProxy, VMware ESXi, Border Gateway Protocol (BGP), Open Shortest Path First (OSPF), Fiber Optics, VoIP, Dovecot, Heartbeat, OpenVZ, CARP, ProFTPD, Mathematics, Networks, Cisco IOS
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