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Technical Articles

Operation and Maintenance

How is GitLab permission management on Debian

This article describes how to manage GitLab permissions on Debian systems. GitLab adopts a role-based access control (RBAC) model, allowing granular control of users and groups' access to projects and resources. Permission management steps: User and group creation: Create users and groups through gitlab-cli or GitLab Web interface and assign them roles (visitor, reporter, developer, owner). Role and permission assignment: On the project "Settings" > "Members" page, assign the corresponding role to each member to determine their access rights to the project (such as code submission, merge request, etc.). SSH key configuration: It is recommended to configure an SSH key to securely access GitLab. Generate a key

Apr 12, 2025 pm 08:27 PM

git

Debian Hadoop data transmission optimization method

The key to improving the efficiency of data transmission in DebianHadoop cluster lies in the comprehensive application of multiple strategies. This article will elaborate on optimization methods to help you significantly improve cluster performance. 1. The data localization strategy maximizes the allocation of computing tasks to the data storage nodes, effectively reducing data transmission between nodes. Hadoop's data localization mechanism will automatically move data blocks to the node where the computing task is located, thereby avoiding performance bottlenecks caused by network transmission. 2. Data compression technology adopts data compression technology during data transmission to reduce the amount of data transmitted on the network and thereby improve transmission efficiency. Hadoop supports a variety of compression algorithms, such as Snappy, Gzip, LZO, etc. You can choose the optimal algorithm according to the actual situation. three,

Apr 12, 2025 pm 08:24 PM

操作系统工具压缩技术

How to improve data security in Debian Hadoop

To enhance the data security of DebianHadoop cluster, we need to work together in multiple aspects, covering key links such as system maintenance, user permission management, data encryption, access control, log audit and security policy formulation. The following are some specific implementation steps: 1. System security maintenance is updated in a timely manner: execute aptupdate and aptupgrade commands regularly to ensure that system patches are updated in a timely manner and protect against known vulnerabilities. 2. The principle of minimum permissions for user and permission management: Create an ordinary user and give sudo permissions to avoid using root users directly. SSH key authentication: Configure SSH key pair authentication, disable root remote login and empty password login. 3. Data encryption

Apr 12, 2025 pm 08:21 PM

apache 工具用户权限管理数据丢失

PostgreSQL performance optimization under Debian

To improve the performance of PostgreSQL database in Debian systems, it is necessary to comprehensively consider hardware, configuration, indexing, query and other aspects. The following strategies can effectively optimize database performance: 1. Hardware resource optimization memory expansion: Adequate memory is crucial to cache data and indexes. High-speed storage: Using SSD SSD drives can significantly improve I/O performance. Multi-core processor: Make full use of multi-core processors to implement parallel query processing. 2. Database parameter tuning shared_buffers: According to the system memory size setting, it is recommended to set it to 25%-40% of system memory. work_mem: Controls the memory of sorting and hashing operations, usually set to 64MB to 256M

Apr 12, 2025 pm 08:18 PM

redis 处理器工具 ai sql语句资源优化 red

How Debian ensures GitLab's data security

Data security is crucial to deploy GitLab on Debian systems. This article outlines the key strategies and measures to ensure the security of GitLab data: Strengthen password policy: Use the PAM module to implement strict password policies, enforce the combination requirements of minimum password length, numbers, upper and lower case letters and special characters, and improve password strength. Secure SSH configuration: Force authentication of SSH key pairs to eliminate password login and reduce security risks. Prohibit root users from logging in remotely through SSH to enhance system security. Strictly limit login of empty passwords to increase the difficulty of cracking. Fine firewall management: rationally configure the iptables firewall and only open necessary ports (such as HTTP)

Apr 12, 2025 pm 08:15 PM

git 工具

How to optimize Zookeeper performance in Debian system

This article discusses how to optimize ApacheZooKeeper performance on Debian systems, covering multiple levels such as hardware, software configuration, network and operating system. 1. Hardware resources ensure high-performance hardware configuration: ZooKeeper servers need to be equipped with sufficient CPU and memory resources, and use SSD solid-state drives to improve I/O performance. Cluster size: Increase the number of ZooKeeper nodes, improve system fault tolerance and load sharing capabilities, and enhance overall performance. 2. Configuration parameter tuning core parameter adjustment: reasonably configure tickTime (heartbeat interval, recommended 2000 milliseconds), initLimit and syncLimit (Leader

Apr 12, 2025 pm 08:12 PM

apache 操作系统工具 ai 数据访问

How to install PostgreSQL in Debian

Install PostgreSQL database on Debian system, you can refer to the following two methods: Method 1: Use APT Package Manager to quickly install this method directly using Debian's APT Package Manager for installation. The steps are simple and quick: Update the package list: Run the following command to update the system package list: sudoaptupdate Install PostgreSQL: Use the following command to install PostgreSQL database: sudoaptinstallpostgresql Start and enable the service: After the installation is completed, start and enable the PostgreSQL service: sudosystemctl

Apr 12, 2025 pm 08:09 PM

How to optimize the performance of Debian OpenSSL

OpenSSL, this open source secure communication library, provides encryption algorithms, protocols and tools for applications to ensure data security. To improve the performance of OpenSSL in Debian systems, you can try the following methods: Update the OpenSSL version: timely update to the latest stable version, which usually includes performance improvements and security patches. For example, the OpenSSL update for Debian12.8 fixes security issues such as buffer overflow and may also include performance optimizations. OpenSSL configuration optimization: Adjust openssl.cnf configuration files according to application needs, such as CipherString and SSL_CIPHER_LIST, and choose a more efficient encryption suite.

Apr 12, 2025 pm 08:06 PM

工具硬件加速

How to encrypt data in Debian MongoDB

Encrypting MongoDB database on a Debian system requires following the following steps: Step 1: Install MongoDB First, make sure your Debian system has MongoDB installed. If not, please refer to the official MongoDB document for installation: https://docs.mongodb.com/manual/tutorial/install-mongodb-on-debian/Step 2: Generate the encryption key file Create a file containing the encryption key and set the correct permissions: ddif=/dev/urandomof=/etc/mongodb-keyfilebs=512

Apr 12, 2025 pm 08:03 PM

mongodb

How to use OpenSSL in Debian

OpenSSL, a powerful open source security toolkit, implements SSL and TLS protocols, and is the key to ensuring network secure communication. This article will guide you on how to use OpenSSL efficiently in Debian systems. 1. It is recommended to use Debian's package manager for installation. This is the most convenient way: sudoapt-getupdatesudoapt-getinstalllibssl-dev This command installs the OpenSSL development library and header files, which is convenient for subsequent compilation of programs that require OpenSSL. If you need a specific version or if there is no required version in the package manager, you need to compile and install it from the source code: wgethttp

Apr 12, 2025 pm 08:00 PM

工具 red

PostgreSQL log management on Debian

PostgreSQL log management on Debian systems covers multiple aspects such as log configuration, viewing, rotation and storage location. This article will provide detailed descriptions of relevant steps and best practices. PostgreSQL log configuration In order to enable logging, the following parameters need to be modified in the postgresql.conf file: logging_collector=on: Enable log collector. log_directory='pg_log': Specifies the log file storage directory (for example: 'pg_log'). Please modify the path according to actual conditions. log_filename='postgresql-%Y-%m-%d_%H%

Apr 12, 2025 pm 07:57 PM

工具 ai sql语句

How to open macos terminal

Open a file in a macOS terminal: Open the terminal to navigate to the file directory: cd ~/Desktop Use open command: open test.txtOther options: Use the -a option to specify that a specific application uses the -R option to display files only in Finder

Apr 12, 2025 pm 05:39 PM

macos

How to take screenshots of macos

There are four screenshot methods on macOS: shortcut keys, touch bars, preview apps, and third-party apps. After the screenshot, the image will be automatically saved to PNG format on the desktop, and you can adjust the format, delay, save position, and floating thumbnail settings through System Preferences.

Apr 12, 2025 pm 05:36 PM

macos

How to record macos screen

macOS has a built-in "Screen Recording" application that can be used to record screen videos. Steps: 1. Start the application; 2. Select the recording range (the entire screen or a specific application); 3. Enable/disable the microphone; 4. Click the "Record" button; 5. Click the "Stop" button to complete. Save the recording file in .mov format in the "Movies" folder.

Apr 12, 2025 pm 05:33 PM

macos 视频编辑