Mastering Modern IT Operations: Roles, Responsibilities, and Evolution

Internet operations focus on service‑centric goals, ensuring stability, security, and efficiency so that a company’s online business can provide high‑quality 24/7 service to users.

Operations engineers strengthen the reliability of underlying infrastructure, services, and online applications, conduct daily inspections to identify risks, optimize architecture to prevent common failures, and improve disaster‑recovery through multi‑data‑center integration. Monitoring, log analysis, and rapid fault response reduce downtime and meet availability expectations.

Security responsibilities include protecting user access at every layer, from network segmentation, ACLs, traffic analysis, and DDoS defense to OS and open‑source vulnerability patching, as well as application‑level XSS and SQL‑injection safeguards, code scanning, permission audits, intrusion detection, and risk control.

Efficiency measures involve IO optimization, image compression, and tool platforms that accelerate product delivery and internal workflow, achieving maximum user value with minimal resource consumption.

Operations Work Classification

As businesses scale, mature internet companies subdivide operations roles into distinct categories.

System Operations

System operations manage IDC, network, CDN, and basic services (LVS, NTP, DNS), as well as asset management and server lifecycle.

IDC Data Center Construction

Collect business requirements, estimate future data‑center scale, evaluate network backbone, building layout, Internet access, attack defense, expansion capacity, space reservation, dedicated lines, and on‑site support, then build and maintain the data center.

Network Construction

Design and plan production network architecture, including data‑center, transport, and CDN networks, and perform daily network tuning.

LVS Load Balancing and SNAT

Deploy load‑balancing clusters to handle traffic entry, provide high‑performance, high‑availability scheduling, and unified network‑layer attack protection; SNAT offers high‑performance public‑access services.

CDN Planning and Construction

Manage third‑party and self‑built CDN, select providers, plan new node layouts, monitor CDN health, and handle user‑hijack incidents.

Server Selection, Delivery, and Maintenance

Test and select servers, reduce power consumption, increase rack density, promote new hardware, diagnose hardware faults, and develop monitoring tools.

OS and Kernel Selection & Maintenance

Select and customize operating systems and kernels, manage patches, maintain YUM repositories, and address OS‑related issues.

Asset Management

Record and manage physical resources (data centers, networks, racks, servers, ACLs, IPs) and provide APIs for automation.

Basic Service Construction

Design highly available DNS, NTP, SYSLOG services to avoid single points of failure.

Application Operations

Application operations handle online service changes, monitoring, disaster recovery, and data backup.

Design Review

Participate in product design reviews to ensure high‑availability requirements are met.

Service Management

Define upgrade, rollback plans, monitor service health, set stability metrics, and respond to incidents promptly.

Resource Management

Manage server assets, assess data‑center distribution, network bandwidth, and allocate resources efficiently.

Routine Checks

Establish regular inspection points and investigate any discovered issues.

Plan Management

Set monitoring thresholds, create response plans, maintain documentation, and conduct drills.

Data Backup

Develop backup strategies, ensure data availability, and perform regular restore tests.

Database Operations

Database operations cover storage design, schema, indexing, SQL optimization, monitoring, backup, high availability, and security.

Design Review

Participate in early‑stage design to set storage, schema, and indexing standards.

Capacity Planning

Monitor database capacity, identify bottlenecks, and plan scaling or optimization.

Data Backup & Disaster Recovery

Define backup and DR strategies, conduct regular recovery tests.

Database Monitoring

Implement health and performance monitoring to detect issues early.

Database Security

Establish account policies, restrict permissions, and manage offline backup security.

High Availability & Performance Optimization

Design failover mechanisms, introduce new storage, hardware, filesystem, and SQL optimizations while controlling costs.

Automation System

Develop automated deployment, scaling, sharding, permission management, backup, and failover tools.

Operations R&D

Build platforms for asset management, monitoring, and data permission systems, exposing APIs for automation.

Operations Platform

Record services and relationships, enable automated lifecycle actions.

Monitoring System

Design and develop monitoring to collect, alert, store, analyze, and visualize resource and service metrics.

Automated Deployment System

Develop deployment automation, manage data, permissions, APIs, and web interfaces, leveraging cloud PaaS for high‑availability platforms.

Operations Security

Operations security reinforces network, system, and application defenses through scanning, penetration testing, tool development, and incident response.

Security Policy Establishment

Define practical, enforceable security policies aligned with internal processes.

Security Training

Provide targeted training and assessments, establishing security responsibilities across the organization.

Risk Assessment

Conduct regular black‑box and white‑box testing to evaluate risks to networks, servers, applications, and user data.

Security Construction

Strengthen weak points, deploy defenses, update patches, scan source code, and apply data encryption, anonymization, and cleanup techniques.

Security Compliance

Handle external compliance requirements such as payment licensing.

Emergency Response

Maintain an alert system, collect third‑party findings, and coordinate remediation and post‑mortem analysis.

Operations Work Development Process

Early teams performed basic data‑center and network setup with minimal online service involvement. As products matured, teams added server monitoring, LVS/Nginx handling, and simple scripting.

Growth led to distinct system and application operations, with application engineers taking over service monitoring, backups, and change management, supported by custom tools for batch operations.

Increasing scale introduced multi‑data‑center disaster recovery, extensive pre‑plan management, and heightened security focus.

When open‑source monitoring could no longer meet performance needs, organizations built platforms to standardize processes, enforce checks, and reduce manual errors.

Finally, self‑scheduling systems abstracted servers as containers, enabling dynamic scaling, automated fault handling, and tighter integration with monitoring, logging, and backup systems.