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Technical Articles

Operation and Maintenance

How to view Debian Hadoop logs

This article introduces how to efficiently view Hadoop logs in Debian system. Hadoop's log aggregation function centrally stores the logs of each node for easy management. The following steps will guide you how to view these logs: Step 1: Make sure log aggregation is enabled First, make sure that log aggregation is enabled for all nodes in the Hadoop cluster. This is usually configured in the yarn-site.xml configuration file: yarn.log-aggregation-enabletrueyarn.log-aggregation.retain-seconds172800yarn.nodemanager.re

Apr 12, 2025 pm 09:54 PM

工具 ai

How to clean up junk files in Debian system

This article will guide you how to effectively clean up junk files in the Debian system, free up disk space, and improve system performance. Be sure to back up important data before performing any deletion operations. 1. Clean the APT cache APT cache stores downloaded packages. Cleaning these caches can free up a lot of space: sudoaptclean#Clean the download cache sudoaptcleanall#Clean the download cache and source code cache sudorm-rf/var/lib/apt/lists/*#Clean the package list cache 2. Cleaning the temporary file system will generate a large number of temporary files during the operation, and you can safely delete most of the files in the /tmp directory.

Apr 12, 2025 pm 09:51 PM

工具

How to recycle useless processes in Debian

This article describes how to effectively terminate useless processes in the Debian system, including processes that have crashed or no longer needed. The following methods are available: Method 1: kill command First, use the psaux|grep process name command to find the process ID (PID) of the target process. After the PID is found, use the killPID command to terminate the process. If the process is unresponsive, use the stronger command kill-9PID to force terminate. Method 2: The pkill command The pkill command allows the process to be terminated based on the process name or other attributes. For example, pkillprocess_name terminates all processes named process_name. pkill-9pr

Apr 12, 2025 pm 09:48 PM

工具自动重启

Analysis of the meaning of error code in Debian Node.js log

When using Node.js on Debian systems, the error codes in the log can help developers quickly locate and resolve problems. The following are some common Node.js error codes and their meanings: EPERM: Operation is not allowed. This is usually due to permission issues, such as not having enough permissions when trying to create a log directory. ENOENT: There is no such file or directory. This means that the file or directory attempted to access or create does not exist. EISDIR: is a directory. This usually happens when trying to process files as directories. EA

Apr 12, 2025 pm 09:45 PM

How to recycle idle network bandwidth

In Debian systems, it is not easy to directly "recycle" idle network bandwidth, because the Linux kernel mechanism does not directly support this feature. However, we can indirectly improve bandwidth utilization through a series of optimization measures. The following strategies are available for reference: Fine network configuration: Use netplan or /etc/network/interfaces files to optimize network settings. For example, configuring static IP addresses or adjusting DHCP parameters can reduce unnecessary IP addresses allocation and release, thereby improving efficiency. Precise flow control: Use the flow control tool tc (TrafficControl) to limit the bandwidth usage of specific applications, ensuring that critical tasks have sufficient bandwidth resources.

Apr 12, 2025 pm 09:42 PM

linux apache nginx 工具

How to configure Debian Sniffer

Configuring a network sniffer (such as Wireshark) in a Debian system requires several steps, including installing the necessary software packages, configuring the network interface, and running the sniffing command. It is important to note that network sniffing may involve security and privacy issues, so before doing sniffing, make sure you have legal authority and comply with all relevant laws, regulations and privacy policies. This article takes Wireshark, a commonly used network protocol analyzer, as an example, to explain its installation and configuration on the Debian system: install Wireshark on Debian to open the terminal. Update package list: sudoaptupdate Install Wireshark: sudoaptinstall

Apr 12, 2025 pm 09:39 PM

How to customize the log format of Debian Node.js

This article will guide you how to customize the log format of Node.js application on Debian system, taking the Winston log library as an example. Step 1: Install Winston First, make sure Winston is installed. If not installed, please execute the following command in the project root directory: npminstallwinston Step 2: Create a custom log format Create a file named logger.js, and write the following code to define the custom log format: const{createLogger,format,transports}=require('winston');con

Apr 12, 2025 pm 09:36 PM

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How to ensure the integrity of Debian Node.js logs

Maintaining log integrity of DebianNode.js applications is critical, which helps monitor server status, troubleshoot issues, and optimize performance. The following steps and suggestions can effectively ensure log integrity: Choosing the appropriate log library is the first step. The following lists some commonly used options, each with its advantages and disadvantages: Winston: It is widely popular, supports multiple output methods, is flexible in configuration, and is easy to set the log storage location. Pino: is known for its speed and is suitable for applications with extremely high performance requirements. Bunyan: Comprehensive functions, default output JSON format logs, and provides command line tools for easy viewing. Roarr: Compatible with Node.js and browser environments, with a wide range of applications

Apr 12, 2025 pm 09:33 PM

浏览器工具日志监控数据丢失

Debian Node.js log backup and recovery strategy

In order to ensure the log security of Node.js applications in Debian systems, this article provides a complete set of log backup and recovery strategies to ensure rapid recovery in case of system failure or data loss. 1. Log backup 1.1 Regular backup: Using rsyncrsync is a powerful file synchronization tool that can realize regular backup of log files: #Create backup directory mkdir-p/backup/logs#Use rsync to backup logs rsync-av--delete/var/log/nodejs/backup/logs/1.2 timing task: crontab creates a backup script, and

Apr 12, 2025 pm 09:30 PM

nodejs 工具 ai 数据丢失

How to recycle unused ports in Debian system

This article describes how to release idle ports in Debian systems. Step 1: Finding the process that occupies the port First, determine which processes occupy the target port. Use the following command: sudonetstat-tulnp|grep or: sudolsof-i: Step 2: Terminate the process that occupies the port and terminate the process. Method 1: Use the kill command (PID is the process ID): sudokill-9 Method 2: Use the killall command (the process name is known): sudokillall Step 3:

Apr 12, 2025 pm 09:27 PM

How to recycle network resources in the Debian system

This article introduces how to efficiently recycle network resources in the Debian system, covering service management, interface control, IP address release, cache cleaning, resource monitoring and network configuration optimization. Disable unnecessary network services: Use the systemctl command to manage system services. For example, disabling the SSH service: sudosystemctlstopsshsudosystemctldisablessh other services (such as FTP, Telnet) can also use similar methods. Close idle network interface: If a network interface (such as eth0) is no longer in use, close it: sudoiplinkseteth0do

Apr 12, 2025 pm 09:24 PM

工具

How to recycle disk space in Debian

This article introduces several methods to recycle disk space in Debian systems. 1. Space usage analysis First, use the following command to view disk space usage: lsblk: Display block device information. df-h: Displays file system disk space usage in an easy-to-read format. 2. Clean useless files and directories/tmp directories: Clean temporary files in this directory regularly (be careful to back up important files). Log file: Delete expired log files in /var/log directory. du-sh/path/to/directory: View the size of the specified directory. 3. Clean the APT cache dpkg--list>/path/t

Apr 12, 2025 pm 09:21 PM

工具数据丢失

How to customize reports with Debian Sniffer

Unfortunately, I can't directly provide answers on how to customize the DebianSniffer report, as there is no information about DebianSniffer in the provided material. Search results show that for network sniffing on Debian systems, tools such as Tcpdump, DSniff, or Wireshark are usually used. The image shows an image titled "How DebianSniffer Customizes Reports", but the image itself does not provide any information. To customize a network sniffer report, you usually need to master the following aspects: Choose the right sniffer tool: Choose the right tool according to your needs, such as Tcpdump (command line tool, powerful but

Apr 12, 2025 pm 09:18 PM

python 工具

How to set the retention period for Golang logs on Debian

This article describes how to control the log file retention time of Golang applications on the Debian system. This usually requires the following steps: Identify the log library: First, determine which log library your Golang application uses, such as standard library log, logrus, or zap. Different libraries have different configuration methods. Log Rotation: Most log libraries need to be accompanied by log rotation tools to achieve automatic management of log files. logrotate is a commonly used tool. Use the standard library log to the standard library log itself does not provide log rotation function, and logrotate is required. Install logrotate:sudoapt

Apr 12, 2025 pm 09:15 PM

golang 工具 ai 标准库

How to use Debian Node.js logs for performance tuning

Logging is crucial to optimize Node.js application performance on Debian systems. Reasonable log configuration and management can effectively monitor and improve application efficiency. The following steps and tips will help you: 1. Choose the right log library Node.js provides multiple log libraries, such as Winston, Pino, and Morgan. Winston is rich in features and supports multiple log levels, transmission methods and structured logging, which is a good choice. 2. Set log level Log level classification according to message importance, common levels include Error, Warn, Info, Debug, etc. Production environments usually only record Error or Warn levels of days

Apr 12, 2025 pm 09:12 PM

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