Have skills of diagnosing problems in various non-standard situations, automation of my own work with bash-scripting (executing group edits in the files, selection of statistical data from text logs, etc.).
During work I pay attention primarily to flexibility and scalability, as well as security.
Precise configuration of Linux OS (RedHat/CentOS/Debian/Ubuntu/Gentoo) for different tasks:
- web servers optimization (Apache, Nginx), load balancing;
- mail servers setup and configuration (Zimbra, Dovecot, Postfix, Exim, Sendmail);
- DNS servers configuration (PowerDNS, BIND, Unbound);
- database servers configuration and optimization (MySQL, PostgreSQL);
- noSQL servers (Redis, MongoDB);
- virtualization systems (KVM, VMWare, Virtualbox, CitrixXEN);
- containerization systems (LXC/LXD, Docker);
- cloud infrastructures configuration (GCP, AWS: EC2, VPC, S3, RDS, IAM, Route53, Beanstalk);
- software configuration management tools (Ansible, Salt);
- orchestration systems (Terraform, Docker Compose, Docker Swarm);
- continuous integration systems (Jenkins);
- HA clusters (Corosync, Pacemaker, DRBD, OCF resource agents);
- improving server security (firewall, AppArmor, AIDE, realtime monitoring of file changes, audit);
- securing server with firewall - from simplest configuration level to automatic blocking of unwanted traffic depending on various terms (including DDoS mitigation);
- secure channels creation (OpenVPN, tinc, PPTP, Stunnel, SSH);
- services monitoring (Nagios+Centreon, Zabbix, Monit) and backup (scripts, Bacula);
- installing and supporting of jabber servers (OpenFire, ejabbed);
- various other services (DHCP, OpenLDAP, Samba, FTP, HTTP/SOCKS/DNS proxies).
Ukrainian (native), Russian (native), English (Intermediate).