Log files: what they are in simple terms, why logging is necessary, how to read logs

A log file is an event log in which a program or system records its actions. When a program or server begins to operate unstably, administrators and developers first turn to log files. These files contain information about various events, including error messages and operation execution times. Log files function as a system "black box", allowing you to determine the cause of problems and quickly make decisions—restart the service, adjust the configuration, or fix a vulnerability. Without logs, diagnosing problems becomes difficult and resembles a guessing game. It's important to regularly analyze and archive log files to maintain high system performance and ensure data security.

In this article, we'll cover log structure, the different types of log files, and how to read and analyze them. We'll also discuss where log files are stored and their purpose. Understanding logs is an important part of working with information systems and helps with troubleshooting, performance monitoring, and security.

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How Log Files Work
Log Types
Log Extensions and Formats
Where Logs Are and How to Handle Them
What to Look for: Tips

How Log Files Work

A log file is a document that sequentially records events occurring in a system or application. Each event is recorded as it occurs, allowing you to track actions and changes in the system. Log files are an important tool for diagnosing, monitoring, and analyzing software and systems, as well as troubleshooting and improving their security.

Screenshot: Windows / Skillbox Media

A record typically consists of several key elements. Each element plays a vital role in shaping the overall content and structure of a post. Key components of a post may include the title, body text, images or graphics, and metadata. The title attracts attention and sets the topic, while the body text contains the essential information needed to understand the topic. Images and graphics can complement the text by visualizing key points, and metadata helps improve the post's visibility in search engines. An effective entry should be well structured and optimized for search engines to attract the target audience and ensure ease of perception.

date and time - to understand when exactly the event occurred;
source - what program or component created it;
event type - normal action, warning, or error;
message - a brief description of the essence.

Let's look at the following entry as an example:

2025-09-26 14:32:10,456 - timestamp.
INFO - logging level. This is a classification of events by their importance, it allows you to understand how serious the event has occurred. The main logging levels are: DEBUG, INFO, WARN, ERROR.
[UserService] - log source, usually the name of a class, module, or component.
User with ID 123 successfully created. — the message itself.

Logging operates automatically. When the program performs an action, a corresponding line is added to the log. If an error occurs, a log entry is also created. For this purpose, the code includes special calls that ensure event recording. Effective logging allows you to monitor application operation and quickly respond to potential problems, which contributes to improving the overall quality of the software.

Logging is an important aspect of work in various areas, including operating systems, applications, network services, and databases. It provides developers and engineers with the ability to trace the sequence of events, which facilitates more accurate diagnosis of emerging problems. Effective use of logging helps improve system performance, enhances security, and simplifies the debugging process. Implementing high-quality logging allows for the timely detection and resolution of errors, which in turn contributes to the stable operation of software and the reliability of services.

Why log files are needed

Logs are an important tool for analyzing system operation and allow you to answer key questions, such as the causes of service failures, slow page loading times, and sources of suspicious activity. Their use covers several key areas, including performance monitoring, error diagnostics, and security. Using logs, specialists can more effectively manage the system, identifying and resolving problems at an early stage, which contributes to increased reliability and stability of resources.

Tracking errors and problems is an important aspect of ensuring service stability and performance. When problems arise, such as system freezes, functionality failures, or user complaints, it is impossible to effectively diagnose the situation without logs. Logs contain critical information, including error messages, warnings, stack traces, and timestamps recording the moment of failure. This information helps pinpoint the cause of a problem, the order in which it occurred, and any possible connections to other events. Proper log management allows for prompt incident response and improved service quality.

System performance is a key aspect to consider. Sometimes problems do not manifest as obvious errors, but the system may still operate slowly. Log analysis helps identify requests or processes that are slowing down performance and pinpoint the locations where delays are occurring. If resources such as CPU, memory, or I/O are under high load, this can lead to decreased performance. Early detection of such problems allows for system optimization, preventing potential failures and ensuring stable operation. Regular performance monitoring and analysis are essential steps to maintaining efficient system operation.

Security is a key aspect in information systems management. Failed login attempts, suspicious activity, and unusual resource access are recorded in logs. In the event of an incident, these records allow you to reconstruct the chronology of events, determine how the attacker gained access, what resources were affected, and minimize potential damage. Log analysis helps identify vulnerabilities and improve system security, ultimately improving overall security.

Standards and Compliance. Industries such as finance, healthcare, and banking have strict requirements for log retention and user activity logging. It is essential to record who performed what, when, and what operations, and be prepared to provide reports upon request. Logs are important because they can serve as legal evidence confirming that all processes are under control and comply with established regulations. Systematic logging not only ensures transparency but also helps build trust in the organization.

Trend analysis and resource planning are key aspects of effective systems management. When new features are launched or the load increases, logs provide important information about how system behavior changes over time. This includes analyzing error rates, call rates, and peak loads. Based on the data obtained, informed decisions can be made, such as scaling the infrastructure, reallocating resources, and improving the system architecture. Effective trend analysis helps optimize performance and ensure system stability.

Log Types

Logs can be classified into main categories based on their content and purpose. This classification helps better understand how to use logs for data analysis and system monitoring.

The operating system generates system logs, which record events occurring in its kernel and components. These logs provide information about the functioning of the OS and connected hardware, allowing you to identify and troubleshoot errors. For example, if a driver is installed incorrectly, causing a printer to malfunction, this can be detected by analyzing the system logs. System logs are an important tool for diagnosing problems and optimizing the operating system.

Include:

loading and unloading drivers;
kernel errors;
hardware events;
OS processes.

Applications generate logs that record events occurring within the program. These logs display actions in the application, including the occurrence of errors and the execution of processes. For example, they can record the moments when the program is opened and closed, as well as error codes during crashes. By analyzing this data, you can easily determine the cause of events and problems the application is encountering. Logs are an important tool for diagnosing and optimizing software.

Include:

application errors;
business logic events;
internal notifications and processes.

Server logs are generated on the platform where the site or application is hosted and record all user interactions. They display events occurring on the server, the number of visitors, traffic sources, and allow you to estimate the request processing time. This data helps determine the need for server optimization. Logs are used to analyze traffic, audit resources, and identify suspicious activity. Proper log analysis helps improve the security and efficiency of a web resource.

Include:

Client IP;
Request URL;
Response status;
Request processing time.

Network devices and systems generate logs that record events related to connections to the Internet and local networks. These logs display information about connection attempts by programs or devices, successful and unsuccessful attempts, and also record errors in the operation of network equipment. Logs are used to monitor network activity, diagnose connection and equipment problems, and identify suspicious activity on the network. Effective analysis of network logs helps ensure the security and stability of the network infrastructure.

Include:

traffic and connections;
network hardware errors;
attempts to access the network by programs or devices.

Systems and applications generate logs to track security-related events. These logs play a key role in attack detection, access control, and security auditing. They record actions that may threaten system security, which helps control access and identify suspicious activity. For example, logs might record ten failed login attempts or the blocking of a suspicious user. Effective use of such logs allows you to increase the level of security and quickly respond to incidents.

Include:

successful and unsuccessful login attempts;
user blocking;
changes in access rights;
suspicious activity.

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Information security threats are risks that can damage data and systems. They can manifest themselves in a variety of forms, including cyberattacks, malware, phishing, and data leaks. To effectively combat these threats, it is necessary to implement comprehensive security measures, such as using antivirus software, regular system updates, training employees in cybersecurity basics, and creating data backups. It is also important to conduct regular security audits and system monitoring to promptly identify and fix vulnerabilities. Applying multi-level security and strict access policies will help minimize risks and ensure the security of information resources.

Smart devices such as home appliances, watches, cars, and other connected gadgets generate data that records their actions and status. This data helps understand the functionality of the device and identify potential problems. It is actively used to monitor device operation, diagnose problems, and analyze user interactions. For example, by analyzing logs, you can find out why the radio in a car stopped working or determine the maximum temperature to which a smart kettle heats up. Proper use of such data helps improve the quality of service and increase user satisfaction.

Includes:

device and sensor status;
errors and malfunctions;
interaction with the user and other devices.

Database management systems generate logs that record events related to the functioning of the database. These logs are necessary for diagnosing database operation, optimizing queries, and monitoring errors. Effective log analysis improves database performance and ensures stable operation.

Logs play a key role in monitoring query execution, analyzing performance, and identifying failures. They help pinpoint slow queries and client connection errors, enabling prompt troubleshooting and system optimization. Effective log analysis helps improve the quality of service and improve the overall performance of the application.

It includes the following elements:

SQL query errors;
slow or failed queries;
client connections and disconnections.

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Log extensions and formats

Logs can be saved in various formats and with various file extensions. Simple text entries are most common, but structured formats are also used for more in-depth system analysis. This allows for efficient data processing and analysis, providing better manageability and accessibility.

Text files are standard data formats that can be opened with any text editor, such as Notepad, VS Code, Sublime Text, Nano, or Vim. They provide easy reading, but their structure is not always optimal for automated data processing.

.log is the standard extension for event logs.

The access.log file in Apache and Nginx web servers records all requests made by users to the server. This log contains important data such as user IP addresses, request timestamps, requested URLs, and response status codes. Analyzing the contents of access.log allows server administrators to track user behavior, identify errors, and optimize the performance of web applications. Proper configuration and regular monitoring of this file help improve the security and performance of your website.

.txt is a simple text file, often used for simple reports and auxiliary logs.

Events.txt is a text log generated automatically by programs and applications to record events. It can contain data on errors, user actions, and other significant events. This log serves as an important tool for analyzing software performance, allowing developers to identify and fix problems, and improve the user experience. Storing information in the events.txt format provides convenient access to data for subsequent processing and analysis.

.out — the output of applications or services.

The app.out file stores the results of executing a program or script, and also includes service messages that can be useful for analysis and debugging.

.err — the error stream (stderr) written to a file.

Example: errors.err stores critical errors during program startup.

System logs (Windows) are saved in the .evtx format. These are not text files, but separate logs. Such logs can be opened through Event Viewer — a built-in Windows utility, the PowerShell command shell, or special utilities.

System.evtx records driver errors, service loading processes, and hardware failures. This is an important log file that allows administrators to track system problems and perform diagnostics. Analyzing System.evtx records helps identify the causes of failures and optimize device performance. Proper understanding and processing of data from this log can significantly improve the stability and performance of the computer system.

Screenshot: Windows Event Log / Skillbox Media

Logs formatted in a strict format such as JSON, XML or CSV provide ease of automatic processing, filtering, and analysis of data. These formats allow for efficient structuring of information, making them ideal for use in a variety of systems and applications. Clearly organized data allows users to quickly extract the information they need and perform in-depth analysis, greatly simplifying work with logs.

.json — Often used in microservices and containers.

log.json is a file that stores structured records. Each record contains a timestamp, error level, and source. This data format is especially useful for analysis and monitoring systems such as ELK Stack and Splunk, as it allows for efficient processing and visualization of information about events and errors in applications. Using log.json improves performance monitoring and helps identify system problems quickly.

.xml — A format with a rigid structure.

audit.xml is a file that contains an export of the Windows security audit log. This file records all logins and changes to user rights. It serves as an essential security monitoring tool, allowing administrators to track suspicious activity and ensure data protection. The audit log aids in incident investigation and security compliance, making it indispensable for organizations seeking to improve the security of their information infrastructure.

.csv is a tabular format convenient for reporting.

events.csv is a file containing an export of events from Windows Event Viewer or network devices. It can be easily opened in Excel or Google Sheets for further data analysis. Using the CSV format allows you to easily process and visualize information, making it an ideal tool for system administrators and security professionals. By exporting events in CSV format, you simplify the monitoring and auditing process, and increase the efficiency of working with data.

A log level is a classification of events depending on their significance. It allows you to determine the severity of an event. Correctly assessing the log level helps in analyzing the situation and taking the necessary measures.

The main levels of records in log files:

DEBUG - detailed data about the operation of a system or application. Used for development and troubleshooting. For example, a developer checks which variable values are passed to functions.

The entry might be formatted as follows:

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DEBUG entries are not critical for system functionality, but they play a significant role in the debugging process. These entries help developers and administrators identify and fix errors, improving the overall stability and performance of the software. Using DEBUG records allows you to analyze system behavior and find bottlenecks, which ultimately leads to a higher-quality product.

INFO — general information about system operation. Used to monitor normal operation: "Service started", "User logged in", "Email sent".

INFO — records that confirm the correct operation of the system. They are used to document events and do not contain additional information.

WARN (warning) — a potential problem. Used when the error is not yet critical, but may cause a problem in the future — for example, the disk is almost full, the database is responding slowly, the network is unstable.

WARN informs that the system is functioning, but the administrator should pay attention to the source of the warning and, if necessary, take appropriate action.

ERROR — an error that is already affecting the operation of the system. Used when an operation failed or a service is not working correctly—for example, an attempt to connect to a database, an email not sent, or a request failure.

An error message indicates that administrator or developer intervention is required. This may be due to technical issues, incorrect settings, or a software update. It is important to promptly contact a specialist to resolve the issue and ensure the system is functioning correctly. Ignoring errors can lead to more serious failures and further difficulties.

FATAL / CRITICAL — A critical error that stops the system or service. Used when nothing works and urgent intervention is required—for example, an OS kernel crash, a web server failure, or the database is unavailable.

Of course, I'm happy to help you with text editing. Please provide me with the text you want to change.

The entry contains an important message: "Corrections must be made urgently, otherwise the service will become unavailable."

TRACE (rare, on some systems) is an even more detailed level than DEBUG. It is used for in-depth analysis of application operation, step-by-step tracking of processes, for example:

Where are the logs and how to handle them

Each operating system has its own storage for logs. Logs are records that record various events and actions in the system, which allows users and administrators to monitor its operation. It is important to manage these logs properly, as they can contain valuable information for troubleshooting and ensuring security. Log storage varies depending on the operating system: for example, on Windows they are located in the event log, and on Linux they are most often collected in the /var/log directory. Effective log analysis helps optimize system performance and identify potential threats.

In the Linux operating system, all system and application logs are stored in the /var/log/ directory. This directory plays a key role in monitoring and analyzing system operation, as it contains important data about events, errors, and warnings. Users and administrators can examine files in this folder to diagnose problems, track activity, and ensure system security. Proper log management in /var/log/ helps maintain the stability and performance of Linux systems.

/var/log/syslog is a general system log.
/var/log/auth.log tells about system logins.
/var/log/nginx/access.log is your site's "black box", it shows who visited and what they requested.

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Linux is a powerful, open-source operating system that has gained widespread popularity due to its flexibility and freedom of use. It is based on open source principles, which allows users to modify and adapt it to their needs. Linux supports many architectures and devices, making it a universal solution for both servers and desktops.

The main advantages of Linux include a high degree of security, stability, and customization. Users can choose from a variety of distributions, such as Ubuntu, Fedora, Debian, and others, allowing everyone to find the right solution for their needs. A community of developers and enthusiasts actively supports the system, providing regular updates and improvements.

Linux is also known for its efficient use of resources, making it an ideal choice for servers and cloud solutions. With support for a wide range of programs and applications, including office suites, graphic editors, and development tools, Linux is becoming increasingly attractive to users of all levels.

In conclusion, Linux is not just an operating system, but an entire ecosystem that provides users with freedom of choice and creativity. If you are looking for a reliable and secure solution for your computing needs, Linux is an excellent choice.

Windows logs are located in the C:\Windows\System32\winevt\Logs\ directory. In this folder, you will find three key sections: System, which contains operating system events; Application, which records program-related events; and Security, which is responsible for user authentication and access. These logs are an important tool for system diagnostics and security monitoring.

Network devices such as Cisco and Mikrotik typically do not store data locally. Instead, they send event logs to a remote server using the Syslog protocol. This allows for centralized log management and availability for analysis and monitoring. Using Syslog simplifies network infrastructure administration and improves security by allowing for timely response to incidents and anomalies in device operation.

Programs create logs to record errors, events, user actions, and internal processes. The storage location of these logs varies depending on the operating system and application type. Proper organization and access to logs aid in diagnosing and troubleshooting problems, as well as analyzing user behavior.

Linux and Unix-like systems have several main directories that play a key role in their file system structure and organization. Each directory performs a unique function, ensuring efficient data management and access. Key directories include:

Root directory (/) — the main directory from which the entire file system begins. It contains all other directories and files.

/bin directory — contains the main executable files necessary for system operation and execution of basic commands.

/etc directory — contains system and application configuration files. English: The settings necessary for the functioning of various services are stored here.

The /home directory is used to store user data and settings. Each user has their own subdirectory in this directory.

The /lib directory contains libraries necessary for the operation of programs and system utilities.

The /usr directory includes additional programs, libraries, and documentation that are not critical to the operation of the system.

The /var directory is used to store changing data, such as logs and temporary storage files.

Knowing the structure of these directories allows you to more effectively manage the system and optimize work with files.

/var/log/program_name/ — for specific applications.
/var/log/ — a general system log; sometimes applications write there.

Windows programs often generate files with the .log extension in installation directories or in the C:\Users\\AppData\ folder. These log files contain important information about application operation, including errors, warnings, and other events that occur during their operation. Analyzing these files can help users and administrators diagnose problems and optimize software performance. Logs can be useful for monitoring performance, identifying crashes, and improving the overall user experience.

C:\Program Files\ProgramName\logs\
C:\Users\\AppData\Local\ProgramName\Logs\

Storing logs separately from the software is a common practice in large companies that use multiple systems and applications, resulting in a significant volume of logs. Event log entries are sent to a dedicated server for storage, which allows for efficient data management and simplifies the analysis process. Logs are viewed using specialized logging systems, which provides convenient access to information and facilitates faster problem identification and resolution. This approach not only improves data organization but also enhances the security and reliability of information systems.

Logs are generated continuously, and without regular cleanup, they can consume all available disk space, leading to server failure. To prevent this problem, log rotation is used. In this case, the old log file is renamed (for example, access.log becomes access.log.1) or archived in .gz format. After this, a new empty log file is created, into which the system begins recording new events. Regular log rotation not only frees up disk space but also ensures ease of data management and log analysis.

Data retention periods depend on specific tasks and requirements. Effective information management requires considering the type of data, its importance, and the need for further use. It is important to establish optimal retention periods to avoid excessive accumulation of information and ensure the availability of up-to-date data. Correctly determining data retention periods minimizes the risk of information leakage and reduces storage costs, while ensuring compliance with legal requirements.

Debugging can take days or weeks;
Analysis and investigations can take months;
Auditing and complying with security requirements (e.g., PCI DSS) can take a year or more.

When a program or service requests to "send a log," it means that a file containing event records needs to be transferred to the development team or support service. This procedure is important for diagnosing the problem and identifying the causes of the application's malfunction. Most often, the file is sent as an email attachment, via a website form, or using a specialized service. This allows specialists to quickly analyze the situation and find solutions to resolve the issue.

Logs can contain sensitive information, including IP addresses and passwords. Therefore, access to them should be strictly limited. It is recommended to use encryption for log transfer, such as Syslog over TLS. This helps protect the data from unauthorized access. It is also important to verify the integrity of the logs to prevent attackers from deleting or modifying information, hiding their actions. For increased security, logs should be stored on a separate server with restricted access, making it more difficult to tamper with or manipulate the data. Signs of file corruption can manifest themselves in various ways. One of the main symptoms is the inability to open a file. If you try to open a document or image but receive an error message, this may indicate corruption. Another sign is unexpected program behavior: it may freeze or close when attempting to load a file. It's also worth paying attention to data corruption: for example, if text is displayed incorrectly or an image appears blurry. If the file was downloaded from the internet, viruses or malware can also cause corruption. It is important to regularly check the integrity of files and use antivirus software to prevent such problems.

the text log cannot be opened in a regular editor;
lines are broken or displayed incorrectly;
the log structure is corrupted (date, source, or event type is missing).

If the log file is partially readable, but contains non-standard characters or does not match the expected format, it should be considered corrupted. In such situations, it is recommended to resort to using backups or data recovery tools. This will help avoid the loss of important information and ensure the correct operation of the system.

How to Read and Analyze Logs

To effectively use logs, it is important to master their opening, filtering, and correct interpretation. Proper log analysis allows you to identify errors, optimize system performance, and improve security. Understanding logs is becoming a critical skill for IT professionals and analysts.

To uncover what's truly important, follow these guidelines:

Time filtering — looking for events within a specific time period. For example, tail -f /var/log/syslog and grep «Sep 26 14:» syslog;
Keywords ERROR, WARN, FAILED, login, timeout immediately point to problem areas;
Event source — the process name, service, or user IP address allows you to understand which program caused the problem;
Regular expressions — a powerful way to find complex patterns, such as errors with a specific code.

Logs represent large volumes of information that are difficult to analyze manually. To get a clear picture of what is happening in a system, application, or network, you need to use specialized tools, such as analyzers, utilities, and data visualization systems. These tools allow you to highlight key events, filter information, identify patterns, and present data visually. This approach significantly simplifies the monitoring and analysis process, improving system efficiency and security.

Linux utilities for working with logs: grep, awk, sed, tail -f. They are used to search, filter, and analyze log files.
PowerShell is a command shell and scripting language from Microsoft. Allows you to view, filter, and analyze event logs.

What to look for in logs

If something broke. You need to select fatal-level logs if the system crashed, or error-level logs if it is working, but poorly. Then review the messages:

The log source will help you identify exactly where the error occurred;
The description will tell you the error code, which will help you understand what happened.

There are a huge number of error codes, and remembering them all is almost impossible. Therefore, many users enter the error code or its description into a search engine. This can result in finding official documentation or discussions where other users share their experiences with similar problems. These resources will help you understand how to fix the error and what steps to take to resolve it.

If the system is functioning but needs improvement, it is important not only to analyze error logs. You should also collect data on actions that require optimization. For example, this may concern the processing of certain requests. These records will help you evaluate performance and identify bottlenecks in the system. Optimizing such processes can significantly improve the efficiency and responsiveness of an application.

by execution time—are actions occurring too slowly?
by the presence of warnings—can an action interfere with the security or stability of the system or cause conflicts?

Next steps depend on the analysis results. It may be worth optimizing the program code to improve performance. It may also be necessary to remove unnecessary dependencies that connect your program to other components. This will help improve overall efficiency and make the code easier to maintain.

Debugging is an important process of finding and fixing errors in code. During debugging, special logs labeled "debug" are generated in the program, providing developers with more detailed information about the processes taking place. These logs help analyze program behavior and identify problems, making debugging an integral part of software development. Proper debugging improves code quality and functionality.

Conclusion

Logs play a key role in eliminating guesswork when analyzing software and systems. When an application throws an error or a system behaves abnormally, it can be a time-consuming exercise to speculate. However, logs provide an accurate and detailed history of events, allowing you to quickly identify the cause of the problem. Using logs not only simplifies debugging but also helps improve the reliability and stability of software.

Entries record events and their timelines, which helps reduce uncertainty. Instead of many possible causes, one or two remain that can be analyzed and used to solve the problem.

Basic log reading skills bring significant benefits. It is enough to master the basic elements: time, source, and error level. These skills will help you in the initial stages of log analysis. Other aspects can be mastered with practice.

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Log files: what they are in simple terms, why logging is necessary, how to read logs

Contents:

How Log Files Work

Why log files are needed

Log Types

Log extensions and formats

Where are the logs and how to handle them

How to Read and Analyze Logs

What to look for in logs

Conclusion