How to skip SSL certificate check in wget

By default, when you use wget to download files, wget will perform a validity check on the website's SSL certificate. Because SSL itself relies on the validity and verification of the certificate. Sometimes, you may want to bypass it. For example, when using wget to try to access a website with an expired SSL certificate or a website with a self-signed certificate.

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A Linux command to check the router CPU chip architecture

How to check the CPU chip architecture of Linux processor? Is the CPU 32-bit or 64-bit? What are arm and mips?
The first step to flash the router firmware is to understand what the router's CPU is, and then find the corresponding version of the firmware to flash it.
For example: Install v2ray software on a router. v2ray is not universal for the entire system. It also distinguishes between CPU chips.

NextCloud installation under Nginx fails to upload and prompts insufficient space

NextCloud was installed quickly on the server, and the server environment was centos7+php7.4.3+nginx+mysql. Since it was installed manually before, something strange happened after NextCloud was installed. Everything worked well, except for uploading. When I clicked upload, it prompted that there was insufficient space. I thought it was a problem with the PHP extension!

SSH public key authentication login

Generally, when we use ssh to remotely log in to a server, we need to enter a username and password. This is very troublesome for people who often maintain the system. How can we log in to a remote Linux/Unix server directly without a password? SSH public key authentication can solve this problem.