The biggest problem you faced is actually the following one https://otodiginet.com/operating-system/how-to-install-snapd-on-centos-8/ and the article above answers the question very well. certbot certos
Permanent link to “How to install certbot on CentOS8”Create a middleware to do that task public static void SetCurrentCulture(this IApplicationBuilder app) { app.Use(async (context, next) => { var cultureQuery = context.Request.Headers["lang"] == "en" ? "en-US" : "zh-CN"; if (!string.IsNullOrWhiteSpace(cultureQuery)) { var culture = new CultureInfo(cultureQuery); CultureInfo.CurrentCulture = culture; CultureInfo.CurrentUICulture = culture; } await next(); }); } Use the middleware in Startup.cs public void Configure(IApplicationBuilder app, IWebHostEnvironment env, ILog logger, IExceptionEntityService exceptionEntityService) { ... app.SetCurrentCulture(); ... }
Permanent link to “.NET Core: Set the correct CurrentCulture basing the `lang` header”Cause: This morning, I change to the /backup directory and found I cannot write in it. So I rapidly typed sudo chown -R david:david .. then press Enter. You know what happened! All the files in / directory were changing the owner to me! I realized this by seeing an error message like "You cannot change the owner of xxx file to david". Damn, how silly I was! Unfortunately, that was not the end of my bad luck. When I try to revert it by typing sudo chown -R root:root /, I got another error message: /usr/bin/sudo must be owned by uid 0 and have the setuid bit set. Then I tried su - root but it seems that I haven't set a root password. How can I recover my pop! OS? reboot it into single-user mode, edit the boot menu, add systemd.unit=rescue.target at the end of the boot line. In the boot console, chown -R root:root /usr; chmod 4755 /usr/bin/sudo; reboot Rather easy, right? It did cost me over 10mins! Linux is also fragile, please don't be such silly next time. I told myself. PS: This time I also set a root password as well, so next time I could run su - root directly instead of going to the single user mode.
Permanent link to “Note: recover from accidentally changed the ownership of `sudo` command”什么是AOP？这种在运行时，动态地将代码切入到类的指定方法、指定位置上的编程思想就是面向切面的编程。
Permanent link to “什么是AOP？这种在运行时，动态地将代码切入到类的指定方法、指定位置上的编程思想就是面向切面的编程。”In short: Change the service file, and add two lines after [Service] line, [Service] LimitNOFILE=65535 LimitNOFILESoft=65535 If you want to know more, read the Reference
Permanent link to “Fix the ‘Too Many Open Files’ Error in a systemd service in Linux”Just record what I made Nginx working with a project located in someone's HOME directory on a Linux machine with SELinux on. Nginx seems working normally, but it actually Didn't listen to a non-80 port at all. If it reports ValueError: Port tcp/8081 already defined, replace -a with -m. semanage port -a -t http_port_t -p tcp 8081 Reference1 Reference2 telnet localhost 8081 works, but telnet 192.168.168.168 8081 from another machine not working! firewall-cmd --permanent --add-port=8081/tcp firewall-cmd --reload Everything seems working good, but when you visit your site, Nginx just gives you a 403! You should ensure Nginx can access your project directory, everyone knows that, but is not enough when SELinux is on. setsebool -P httpd_enable_homedirs 1 setenforce 0 systemctl restart nginx systemctl daemon-reload Reference
Permanent link to “SELinux sucks?! Safety always means inconvenient, right!”I had written the following code in a project ... return s && s.value || null It works well for some days until a colleague did some code refactoring. In the beginning, s.value is a string value, and an empty string is not a valid value, so the code works well. After the refactoring, s.value became an integer, and this time 0 is a valid value. So you can imagine when s.value === 0 the code above will return null instead of 0. It caused a bug! Therefore please use the"A || B" expression with caution!
Permanent link to “Caution: Javascript A || B expression is handy, but it also can cause tricky bug”