分类 Miscellaneous 中的文章

Mounting an External Hard Drive in Linux

2019年1月6日 | Miscellaneous

After a machine restart, the external hard drive wasn’t recognized and needed to be remounted. However, after using fdisk -l, the external hard drive was nowhere to be found, making it impossible to mount.

In practice, this kind of problem usually has two steps: first confirm whether Linux can still see the disk device, then decide whether you can mount it directly or need to rescan the bus so the device appears again.

How to Mount a Disk

First, use fdisk -l to check the current hard drive status.

    ➜  ~ fdisk -l 
    WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion.

    Disk /dev/sdb: 320.1 GB, 320072933376 bytes, 625142448 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk label type: gpt
    Disk identifier: AF1B577B-830C-4026-AC5F-37870D362B3C

    #         Start         End    Size  Type            Name
    1          2048      411647    200M  EFI System      EFI System Partition
    2        411648     2508799      1G  Microsoft basic
    3       2508800   625141759  296.9G  Linux LVM

    Disk /dev/mapper/centos-root: 53.7 GB, 53687091200 bytes, 104857600 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes

    Disk /dev/mapper/centos-swap: 3623 MB, 3623878656 bytes, 7077888 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes

    Disk /dev/mapper/centos-home: 261.5 GB, 261468717056 bytes, 510681088 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes

    Disk /dev/sda: 1000.2 GB, 1000170586112 bytes, 1953458176 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk label type: dos
    Disk identifier: 0x16f2a91f

          Device Boot      Start        End    Blocks  Id  System
    /dev/sda1             1 4294967295 2147483647+ ee  GPT

Here, my external hard drive is 1TB, so I can identify it as /dev/sda1. Then I can mount it with mount:

……

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Five Easy Steps to Achieve Linux Passwordless Login

2019年1月2日 | Miscellaneous

SSH, which stands for Secure Shell, is a widely used and reliable program for securely executing commands remotely on Linux systems. SCP, used for secure file transfers, is also based on the SSH security protocol.

When you have many servers, frequently typing passwords can be quite troublesome. So, how can you log in without a password while maintaining security? Of course, it’s possible. Here, we’ll outline five steps to achieve passwordless login for Linux servers such as RHEL/CentOS 7.x/6.x/5.x and Fedora.

The important point is that this does not mean “turning security off.” It means replacing password-based login with SSH key-based authentication, which is usually a better operational choice when your private key is handled properly.

Five Easy Steps to Achieve Linux Passwordless Login

Let’s look at the environment:

    SSH Client : 192.168.1.12 ( Mac )
    SSH Remote Host : 192.168.1.11 ( CentOS 7 )

This article will demonstrate passwordless login from a Mac to a remote CentOS 7 server.

……

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Detailed Explanation of Python Magic Methods

2018年12月26日 | Miscellaneous

This article explains Python magic methods through object lifecycle, operator overloading, and __call__ examples, with a beginner-friendly view of what they do and when they are worth implementing.……

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boxes: An Interesting Command-Line String Shaping Tool

2018年12月21日 | Miscellaneous

This article introduces the Linux command-line tool boxes, shows how to generate ASCII text borders quickly, and highlights a few practical places where it works well in help output, comments, and terminal UI text.……

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Using Python to Get Real Video URLs from VIP Parsing Sites

2018年12月19日 | Miscellaneous

There are currently many video sites in China, including Tencent Video, iQIYI, Youku, Bilibili, etc. These sites have many VIP videos that require payment. Recently, there have been a few dramas I wanted to watch.……

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Python Random Strong Password Generator

2018年12月18日 | Miscellaneous

This article shows how to generate strong random passwords with Python and JavaScript, and explains why security-sensitive cases should prefer secrets or the browser Web Crypto API instead of ordinary random functions.……

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How to Use Prism for Code Highlighting in WordPress

2018年12月13日 | Miscellaneous

This guide shows how to use Prism.js for code highlighting in WordPress, including plugin installation, the correct Custom HTML block markup, and quick checks when highlighting does not appear.……

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Setting up TensorFlow Deep Learning Server Environment

2018年11月30日 | Miscellaneous

This article records a legacy Ubuntu 18.04 TensorFlow GPU setup based on Anaconda, CUDA, and cuDNN, with extra notes on version compatibility and quick checks after installation.……

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Using Tencent CDN and Cloudflare CDN Services Simultaneously

2018年11月26日 | Miscellaneous

For websites providing both Chinese and English services, balancing access speed for domestic and international users is very important.……

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Setting Python 3 as the Default Environment in Baota Panel

2018年11月16日 | Miscellaneous

Baota Panel is a management panel that simplifies server administration via a web interface, boosting operational efficiency. It enables easy installation of essential web programs, website creation and management, FTP, database tools, a visual file manager, CPU, memory, and traffic monitoring charts, and scheduled tasks.……

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