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. root@pve:~# 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...

after I lock ftp user to stop them access system dir. some user get an error when they login. 500 OOPS: vsftpd: refusing to run with writable root inside chroot () because if the user is limited to his home directory,the user's home directory can no longer have write privileges.If the...

when I build this site.I need ftp to upload web files to the server space.And the upgrade of wordpress also need ftp. I found it dangerous if the ftp user can access "/" directory. I want to lock them to each ftp root dir. So that I can protect my linux system dir. There's a way. vi...

this site is used to share some technology or funs of computer. like the first program of any code language. I want to say~ Hello World! :) ...