The Linux dig command allows you to query DNS servers and perform DNS lookups. You can also find the domain an IP address leads back to. We’ll show you how! How the dig Command Works People use the Linux dig command to query Domain Name System...

The Linux operating system includes a plethora of tools, all of which are ready to help you administer your systems. From simple file and directory tools to very complex security commands, there’s not much you can’t do on Linux. And, although regular desktop users may not need to become...

Nginx part: check if your nginx has http_realip_module.use command nginux -V # nginx -V nginx version: nginx/1.14.2 built by gcc 4.4.7 20120313 (Red Hat 4.4.7-23) (GCC) built with OpenSSL 1.1.1a 20 Nov 2018 TLS SNI support enabled configure arguments: --prefix=/usr/local/nginx --user=www...

1 check firewall service statussystemctl status firewalld 2 check firewall status firewall-cmd --state 3 open,restart,close firewalld service # start service firewalld start # restart service firewalld restart # close service firewalld stop 4 check firewall rulesfirewall-cmd...

We use chmod command to change permissions of folders and files. [email protected]:~# chmod --help Usage: chmod … MODE… FILE… or: chmod … OCTAL-MODE FILE… or: chmod … --reference=RFILE FILE… Change the mode of each FILE to MODE. With --reference, change the mode of each FILE to...

Local source configuration method Go into /etc/yum.reps.d/ directory and create a file ending with .repo.The content like follow. name=cdrom #cdrom is notes.it can write casually. baseurl=file:///mnt/ #local cdrom's path. path of the yum source. enabled=1 gpgcheck=0 ...

Sometimes when we run ls to list files.There's only black background with white words.We can't see file/dir or executable easyly. There's a file named .bashrc under user folder.Such like /root/.bashrcWe can modify this file and add a command line.alias ls='ls --color' After reboot...

Sometimes we need run some commands automatic when system boot up. We can put the command or script into /etc/rc.locallike:vi /etc/rc.localadd command line into filemount --bind /var/www/html/ /home/ftpuserThis will mount web base dir to ftp base dir automatic when system startup. And don't...

like windows has scheduled tasks.linux has crontab.it's a tool for excute tasks on time. how to install crontab?we can use yum.yum install vixie-cron crontabsthen run itservice crond startwe can add it into autostart when we open the computer.chkconfig --level 345 crond on how to use...

what is lamp? lamp is linux+apache+mysql+php.They are all open source software and free. change your centos 7 yum source to a faster source and upgrade the os.for example: 1 backup local yum source. mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo_bak2 get a faster...