Centos7 image download

CentOS 7 mirror download seems simple, but it actually has hidden secrets. You need to choose the right mirror source, verify the completeness of the mirror, and choose the right version. When selecting a mirror source, speed is the key, and it is recommended to use Alibaba Cloud, NetEase Cloud or Tsinghua University mirroring station. After the download is complete, use MD5 or SHA256 to verify the integrity of the mirror to ensure that the mirror has not been tampered with. Select the minimized installation version or full installation version according to your needs, and pay attention to details such as breakpoint continuous transmission, download tool selection, disk space inspection, etc., so as to easily complete the CentOS 7 image download.

CentOS 7 image download: those pitfalls you may not know

Many friends ask as soon as they come up: Where to download the CentOS 7 image? This question seems simple, but it actually has a secret. It is not enough to just know a download address. Download speed, mirror integrity, and version selection are the real headaches. After reading this article, you can not only download it, but also deal with various download problems like an old driver.

Let’s talk about the conclusion first: Don’t expect a perfect and never wrong download method. Selecting the right mirror source and verifying the integrity of the mirror is the king.

Selection of mirror source: speed is key

Official mirroring site? Don't be funny, unless your internet speed can instantly kill the speed of light. Although the official mirror site is authoritative, the download speed is often so slow that it makes people crazy. Therefore, we need to find a reliable domestic mirror source. Alibaba Cloud, NetEase Cloud, Tsinghua University open source software mirroring station... these are all good choices. But before choosing, use wget or curl to test the speed and see which one is faster. Don't forget that this speed will also be affected by time and network conditions, so try a few more to find the optimal solution.

Verify mirror integrity: safety first

After downloading the image, don't rush to install it! Are you sure whether this mirror has been tampered with? If the downloaded image file is damaged and there are problems during the installation process, it will be a big loss. Therefore, be sure to verify the integrity of the mirror! CentOS images usually provide MD5 or SHA256 checksums. After the download is complete, use the md5sum or sha256sum command to calculate the checksum of the downloaded file and then compare it with the official provided checksum. If it is consistent, it means that the mirror is complete; if it is inconsistent, download it again quickly.

Code example (Bash):

 <code class="bash"># 下载镜像（替换为你的镜像地址） wget -c http://mirrors.tuna.tsinghua.edu.cn/centos/7/isos/x86_64/CentOS-7-x86_64-Minimal-1810.iso # 计算SHA256校验和sha256sum CentOS-7-x86_64-Minimal-1810.iso # 将计算结果与官方提供的校验和进行比较# (官方提供的校验和需要从CentOS官网获取)</code>

Version selection: Minimize installation or complete installation?

There are many mirror versions of CentOS 7, including minimal installation version, full installation version, etc. The minimum installation version has a small size and a fast download speed, but it requires manual installation of many software; the complete installation version has a large size and a slow download speed, but it contains most commonly used software. Choose the right version according to your needs and don’t download it for a long time, but it turns out that what you download is not what you want.

Sharing experience of trapping:

• It is important to continue the breakpoint! During the download process, the network is interrupted and the entire mirror is re-downloaded. Who can bear this? The -c parameter of the wget command can realize the interruption of breakpoints.
• The choice of download tools is also important. wget and curl are both good choices, each with its advantages and disadvantages, and you can choose according to your own habits.
• Don't forget to check your disk space! CentOS 7 images usually have a size of several G or even dozens of G. Be sure to make sure your disk has enough free space before downloading.

In short, downloading a CentOS 7 image seems simple, but the details determine success or failure. Selecting the right mirror source, verifying the mirror integrity, and choosing the right version are all essential steps. Remember these and you can easily get the CentOS 7 image download like a veteran. Don’t forget, only by practicing and summarizing more can you become a real programming master!

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