![]() ![]() ![]() The next step would be to install some useful system utilities using YUM Package Manager, such as net-tools (this package provides the olderīut good ifconfig command), nano text editor, wget and curl for URL transfers, lsof (to list your open files) and bash-completion, which auto completes typed commands. After the installation finishes, login on your server with root account or a user with root privileges and perform a system update, to make sure that your system is up-to-date with all packages and security patches. Disable/Remove Postfix MTA, Avahi and Chrony Servicesġ. The main external services that your server truly requires to run after you perform a minimal installation would be just a SSH daemon, in order to allow remote logins on system, and, in some cases, NTP service, to accurately synchronize your server internal clock with external NTP servers. ![]() If you are planning to use your newly installed RHEL/CentOS 7 to host, let’s say, a small website which runs on Apache or Nginx, or to provide network services like DNS, DHCP, PXE boot, FTP server, etc or other services that don’t require to run Postifx MTA daemon, Chrony or Avahi daemon, then why we should keep all these unnecessary daemons installed or even running on your server. if they are pre-installed? One of the main reason would be to increase system security level degree, the second reason is system final destination and the third is system resources. Why wed need to disable all these services. RHEL/ CentOS 7 minimal installation for servers comes with some default pre-installed services, such as Postfix Mail Transfer Agent daemon, Avahi mdns daemon (multicast Domain Name System) and Chrony service, which is responsible to maintain system clock. ![]()
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