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Technical Articles

Operation and Maintenance

How to configure Tomcat log rotation

This article introduces how to use the logrotate tool provided by Linux system to achieve automatic rotation of Tomcat logs. Step 1: Create or modify the logrotate configuration file. In the /etc/logrotate.d/ directory, create or modify the configuration file named tomcat (or other name you choose). Use the following command: sudovim/etc/logrotate.d/tomcatStep 2: Add or modify the configuration file contents Add the following contents to the configuration file to configure Tomcat's catalina.out log file rotation: /usr/local/tomcat/logs/catalina.ou

Apr 13, 2025 am 08:06 AM

linux 工具 tomcat ai

How to recycle log files in Debian

The log files of the Debian system are usually stored in the /var/log directory. In order to effectively manage these log files and avoid taking up too much disk space, you can use the following methods to clean or compress: Method 1: Use the logrotate tool Debian system has built-in logrotate tool, which can automatically manage the rotation, compression and deletion of log files. Its configuration file is located in /etc/logrotate.conf, and the specific log file configuration is located in /etc/logrotate.d/ directory. You can manually run logrotate via the following command: sudologrotate/etc/logrotate.conf or

Apr 13, 2025 am 08:03 AM

工具

Best Practices for GitLab in Debian

When installing and configuring GitLab in Debian systems, following best practices can help ensure system stability, security, and efficiency: Preparation before installation Update system package: sudoapt-getupdate Install necessary dependencies: sudoapt-getinstall-ycurlopenssh-serverca-certificatestzdataperlAdd GitLab official repository: curlhtt

Apr 13, 2025 am 08:00 AM

git nginx 工具数据丢失

How to identify attacks in Tomcat logs

Tomcat logs are critical to identifying potential attacks effectively. This article will guide you on how to identify malicious activities from the logs and make corresponding security suggestions. Identifying malicious traffic features Attackers often use coding techniques to hide malicious intentions. Common encoding methods include: URL encoding: encoding using the beginning of % (for example, <script> decoded as). Base64 encoding: The encoding result is usually ending with = or == (for example, PHNjcmmlwdD4= decoded as). Hexadecimal encoding: start with \x (for example, \x61 decodes to a). Unicode encoding: start with \u or \U (for example, \u7F16\u7801 decodes as "encoding")

Apr 13, 2025 am 07:57 AM

tomcat sql语句敏感数据

How to use Debian Apache logs to improve performance

This article describes how to improve server performance by analyzing and optimizing Apache logs under Debian systems. We will start from three aspects: log analysis, performance monitoring and security and stability, and gradually explain the optimization method. 1. Log Analysis and Optimization First of all, it is crucial to understand the Apache log format. The log contains key fields such as IP address, access time, request resources, status code and browser information, which are the basis for subsequent analysis. You can customize log formats through LogFormat and CustomLog directives, selectively record more detailed information or simplify log content, thereby improving analysis efficiency. In addition, rationally configuring the log rotation mechanism, such as splitting log files by day or month, can effectively avoid single

Apr 13, 2025 am 07:54 AM

apache 浏览器 access 工具 ai 实时数据分析

How Debian recycles expired software

This article describes how to efficiently clean out expired software packages in Debian system. The main methods include using apt and dpkg commands. Method 1: Use the apt command apt command to provide a variety of ways to clean out expired packages: uninstall the package: sudoaptremovepackage_name removes the specified package and retains the configuration file. Completely uninstall: sudoaptpurgepackage_name completely deletes the package and its configuration files. Automatically remove dependencies: sudoaptautoremove automatically deletes dependency packages that are no longer needed. Clean the cache: sudoaptclean

Apr 13, 2025 am 07:51 AM

How does debian readdir perform in multi-threaded environment

The readdir system call is used to read the directory contents. In Debian and other Linux distributions, its implementation is usually considered thread-safe, but its actual performance is affected by the library implementation and system call methods. Note when using readdir in a multi-threaded environment: Thread safety: Most modern C libraries (such as glibc) readdir implementations are thread-safe, which means that multiple threads can be called simultaneously without data competition. Global state: While readdir itself is thread-safe, it may depend on global state (such as the internal state of directory streams). Therefore, in a multi-threaded environment, it is necessary to ensure access to directory streams, such as using mutex locks. Performance impact: multiple threads

Apr 13, 2025 am 07:48 AM

linux 同步机制

Troubleshooting of GitLab in Debian

There are some common problems you may encounter when installing and configuring GitLab in Debian systems. Here are some common troubleshooting steps and solutions: Network Troubleshooting If you encounter network problems, such as not being able to ping the server or accessing the GitLab page, first check whether the network connection is normal. Confirm whether the firewall settings allow access to GitLab's default ports 80 and 443. Server Performance Issues If the GitLab service is slow or unreachable, check the server's CPU, memory, and disk space usage. Use tools such as t

Apr 13, 2025 am 07:45 AM

git 工具网络问题

How to optimize Debian Apache log reading speed

To improve the speed of DebianApache log reading, the key is to choose the right tools and strategies. The following methods can effectively improve log reading efficiency: 1. Efficient log viewing tool tail command: monitor log changes in real time, tail-f/var/log/apache2/access.log view access logs, tail-n100-f... view the last 100 lines. multitail: Monitor multiple log files at the same time, convenient for comparison and analysis. Lnav: Powerful log analysis tool that supports real-time monitoring and advanced analytics. 2. Log rotation strategy uses the logrotate tool to regularly divide log files to prevent single files

Apr 13, 2025 am 07:42 AM

apache access 工具 ai

How to locate issues through Debian Apache logs

This article will guide you how to use the Apache log files of the Debian system to effectively troubleshoot server problems. First, open the terminal and use a text editor such as nano, vim, or gedit to open Apache's access log and error log. These files are usually located in the /var/log/apache2/ directory and are named access.log and error.log respectively. You can open them with the following command: sudonano/var/log/apache2/access.logsudonano/var/log/apache2/error.log Next, analyze the log contents. access

Apr 13, 2025 am 07:39 AM

apache access 工具 ai 500错误

How to prevent security issues in Nginx logs

Nginx log security is crucial, it may leak sensitive information or expose malicious access attempts. This article provides a series of effective measures to help you improve Nginx log security: Access control: Strictly restrict access to Nginx log files. Only authorized personnel can access it and use file system permissions to control access. At the same time, implement log rotation and archiving strategies to reduce the scale of log files and reduce risks. Information desensitization: The log format should avoid recording sensitive information (such as passwords, credit card information). Use the log desensitization tool or custom log format to hide sensitive data. Real-time monitoring and alarm: Deploy the monitoring system to track abnormal behavior in Nginx logs in real time. Configure alarm mechanism,

Apr 13, 2025 am 07:36 AM

nginx 工具敏感数据

How to recycle damaged bags in Debian

Have you encountered a corrupt package in Debian system? Don't worry, this article provides several repair methods to help you restore system stability. Step 1: Update the package list Make sure your package list is up to date. Open the terminal and execute the following command: sudoaptupdate Step 2: System upgrade try to upgrade all packages, which may fix the damaged package: sudoaptupgrade Step 3: Fix dependency If the problem remains after upgrading, try to repair the damaged dependency: sudoapt-get-finstall Step 4: Remove the damaged package If the above method is invalid, please find the name of the damaged package (for example: broken-package) and make

Apr 13, 2025 am 07:33 AM

数据丢失系统升级

How to identify malicious access in Debian Apache logs

Effective monitoring and defense against malicious website access is crucial to the Apache server on the Debian system. Apache access logs are the key source of information to identify such threats. This article will guide you on how to analyze logs and take defensive measures. The Apache access log that identifies malicious access behaviors Debian systems is usually located in /var/log/apache2/access.log. You can analyze the logs in a variety of ways: Log file location confirmation: First, please confirm the exact location of your Apache access log, which may vary slightly depending on the system configuration. Command line tool analysis: Use grep command to search for specific patterns, such as grep "404"

Apr 13, 2025 am 07:30 AM

apache access 工具 ai

How to set up anti-spam policy for debian mail server

This article introduces how to deploy a powerful anti-spam system on Debian mail server, mainly using Postgrey graylist mechanism and SpamAssassin spam filter. 1. Use Postgrey to build a gray list to install Postgrey: Use the following command to install Postgrey software package: sudoapt-getupdate&&sudoapt-get-yinstallpostgreyConfigure Postgrey: Edit /etc/default/postgrey file, modify POSTGREY_OPTS parameters, and set the delay time (

Apr 13, 2025 am 07:27 AM

工具 ai

Where to view the logs of Tigervnc on Debian

In Debian systems, the log files of the Tigervnc server are usually stored in the .vnc folder in the user's home directory. If you run Tigervnc as a specific user, the log file name is usually similar to xf:1.log, where xf:1 represents the username. To view these logs, you can use the following command: cat~/.vnc/xf:1.log Or, you can open the log file using a text editor: nano~/.vnc/xf:1.log Please note that accessing and viewing log files may require root permissions, depending on the security settings of the system.

Apr 13, 2025 am 07:24 AM