CentOSv8

https://dev.to/onichandame/ulimit-on-centos-8-1-3md3 ulimit on CentOS 8.1 https://www.linuxtechi.com/set-ulimit-file-descriptors-limit-linux-servers/ In  /etc/security/limits.conf   * soft nofile 32767 * hard nofile 65535 [username] soft nofile 32767 [username] hard nofile 65535 /etc/systemd/user.conf DefaultLimitNOFILE=65535 1. `/etc/security/limits.conf` works for processes not under the control of systemd. Therefore, since (for example) my Gnome Terminal is running under systemd, `limits.conf` doesn't affect my Terminal's `ulimit`. 2. `/etc/systemd/user.conf` translates as roughly what controls the soft limits for your `ulimit`. 3. `/etc/systemd/system.conf` acts roughly as the hard limit. Problem On a fresh-installed Centos 8.1(kernel 4.18.0-147.8.1.el8_1) machine, the max number of opened file descriptors is set to H: 2048, S: 1024. By editing  /etc/security/limits.conf  the limits can be upped. But this only takes effect in non-gnome-terminals...

แทน iptable ด้วย nftable  YUM    มี DNF  มาเพิ่มอีกตัว ทดสอบแล้วก็ใช้ได้ดี dnf group install "Development Tools" DNF and repositories CentOS offers a bit of a different take on installing and updating packages. First off, the default package manager has migrated from YUM to DNF. The command structure for each is quite similar, so instead of running a command like: sudo yum install httpd You'd issue the command: sudo dnf install httpd For more information on DNF, see  How to use the DNF package manager . Component updates There are plenty of updates to be found in CentOS 8. The highlight reel looks something like this: Python 3.6 MariaDB 10.3, MySQL 8.0, PostgreSQL 9.6 and 10 Redis 4.0 HTTPD 2.4 and NGINX 1.14 OpenLDAP has been replaced by 369 LDAP Server Varnish Cache 6.0 Git 2.17 Maven 3.5 Perl 5.24 and 5.26 PHP 7.1 and 7.2 Ruby 2.5 Node.js 8 and 10 Rust Toolset 1.26 Scala 2.10 Go Toolset 1.10 GCC System Compiler 8.1...