web.serviceactive (running)
Web servers and hosting
nginx, Angie, Apache, PHP-FPM. HestiaCP, ISPmanager, FastPanel and DirectAdmin panels. SSL, redirects, tuning for load, high availability.
root@zentsov:~# whoami → Maxim Zentsov, systems administrator
Infrastructure that doesn't wake you up at night
I've been setting up, maintaining and rescuing servers for 17 years: Linux and Windows, web hosting, Bitrix and 1C, databases, mail, security. I take responsibility for keeping it all running.
17 yearson FL.ru — since 2009
196 · 5.0reviews · average rating
277times hired
87escrow deals
data from the FL.ru profile →
~/services
Services: everything between the code and the hardware
From a single VPS to clusters under load. I work directly and hands-on, on production servers — carefully and with backups.
bitrix.serviceactive (running)
Bitrix and 1C
BitrixVM, web clusters (nginx + PHP + memcached + HAProxy), 1C integration, performance, MySQL 8 compatibility, recovery after failures.
db.serviceactive (running)
Databases
MySQL, MariaDB, Percona, PostgreSQL, MongoDB. Replication, backup and restore, configuration tuning and slow-query optimisation.
mail.serviceactive (running)
Mail servers
mailcow, Postfix, Exim, Dovecot. Migrations without losing a single message, multi-domain setups, SPF / DKIM / DMARC, the fight for deliverability.
security.serviceactive (running)
Security and incidents
Breach response: finding and removing shells, backdoors and rootkits, root-cause analysis, closing the holes. DDoS mitigation, hardening, fail2ban, CSF, access audits.
devops.serviceactive (running)
DevOps and automation
Docker and Docker Compose, GitLab CI/CD, automated deployment, backup strategies, monitoring and alerting — so that you hear about a problem before your customers do.
migrate.serviceactive (running)
Migrations and upgrades
Moves between servers and data centres, Debian and Ubuntu upgrades, PHP and MySQL version changes on live projects — with minimal downtime.
windows.serviceactive (running)
Windows Server
1C servers, MS SQL, terminal farms and RDS licensing, Active Directory, IIS. Platform updates and maintenance.
/var/log/cases
Cases: what this looks like in practice
A few recent jobs — no client names, but with the real details.
case/db-replica-lagresolved
MySQL replica hours behind the primary
- symptom
- reports built on yesterday's data, replica lag growing
- cause
- innodb_buffer_pool_size = 32M instead of 32G — a typo in the config
- fix
- corrected configuration, controlled restart — lag down to 0 seconds
case/compromised-hostresolved
Compromised server with replaced system binaries
- symptom
- suspicious activity, modified /usr/bin/su, a hidden backdoor
- cause
- compromised credentials, no file-integrity monitoring
- fix
- forensics, backdoor removal, credential rotation, hardening and monitoring
case/bitrix-clusterdeployed
1C-Bitrix web cluster built for load
- task
- a fault-tolerant portal: several app nodes behind a load balancer
- stack
- HAProxy + nginx + PHP 8.4 + memcached, database on its own host
- result
- cluster in production: a node drops out, the site keeps serving
case/debian-upgraderesolved
Production upgrade, Debian 11 → 12
- task
- upgrade the OS on a hosting box with dozens of sites and MySQL 5.7
- difficulty
- MySQL 5.7 → 8.0 transition, several PHP-FPM versions, a control panel
- result
- upgraded step by step, with backups and a rollback plan — no data lost
/var/log/reviews
Client reviews
196 reviews on FL.ru with an average rating of 5.0, over 17 years of work. A few of the most recent ones, translated from Russian:
The mail server migration to a new machine went through without losses and without downtime. Everything was precise, calm and handled with a full grasp of the subject.
Excellent specialist! Helped solve a server problem quickly and professionally. Recommended!
Many thanks for the work! Fast, precise and to the point. A real pleasure to work with a professional!
Maxim is a pro. Fast, high quality, reasonably priced. Recommended!
/etc/formats.conf
How I work
For standard jobs I quote a fixed price after a short assessment — before the work starts, not after.
One-off job
Set it up, fix it, move it
Server audit, stack setup, migration, optimisation, a one-time fix. Fixed scope, a clear outcome, a report on what was done.
Describe your task →
Ongoing support
A server that is always watched
Retainer maintenance: monitoring, updates, backups, response to alerts and priority contact. You run the business — I run the servers.
Discuss the terms →
Emergency
Site down? Server hacked?
Emergencies are handled first: an unreachable site, a crashed database, a breach, a full disk. First we bring the service back, then we deal with the cause and prevent a repeat.
Message me urgently →/usr/share/stack
Stack and tools
What I work with every day. If your item isn't on the list — chances are I'll figure that one out too.
# os and virtualisation
# web and control panels
# databases
# devops and ci/cd
# network and security
/contact
Tell me what's going on with your server
Describe the task or the problem in your own words — I answer personally, no account managers, no scripts. If it's on fire, say so: emergencies come first.
$ echo "usually replies within a couple of hours during working hours"
→ reviews and portfolio: profile on FL.ru