Delta RPMs disabled because /usr/bin/applydeltarpm not installed.

sudo yum install deltarpm

Install and Activate Bash Autocomplete Feature

sudo yum install bash-completion

ref: https://www.cyberciti.biz/faq/fedora-redhat-scientific-linuxenable-bash-completion/

centos 7 change hostname

https://www.atlantic.net/community/howto/change-your-hostname-in-centos-7/

hostnamectl will modify /etc/hostname and /etc/machine-info, and will not modify /etc/hosts

# hostnamectl 
   Static hostname: localhost.localdomain
Transient hostname: yzb-centos-08
         Icon name: computer-vm
           Chassis: vm
        Machine ID: ef3e5618f3854f9e8f279e42f3f310d9
           Boot ID: 7d5b180711004778aae7e6179a05ad05
    Virtualization: kvm
  Operating System: CentOS Linux 7 (Core)
       CPE OS Name: cpe:/o:centos:centos:7
            Kernel: Linux 3.10.0-327.28.3.el7.x86_64
      Architecture: x86-64

# cat /etc/sysconfig/network
# Created by anaconda

# hostname
yzb-centos-08

# cat /etc/hostname 
localhost.localdomain

# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

# cat /etc/machine-info
cat: /etc/machine-info: No such file or directory

Set all with hostnamectl

hostnamectl set-hostname 'Server222'

checking

# hostnamectl
   Static hostname: server222
   Pretty hostname: Server222
         Icon name: computer-vm
           Chassis: vm
        Machine ID: ef3e5618f3854f9e8f279e42f3f310d9
           Boot ID: 7d5b180711004778aae7e6179a05ad05
    Virtualization: kvm
  Operating System: CentOS Linux 7 (Core)
       CPE OS Name: cpe:/o:centos:centos:7
            Kernel: Linux 3.10.0-327.28.3.el7.x86_64
      Architecture: x86-64

# hostname
server222
# cat /etc/hostname 
server222
# cat /etc/machine-info
PRETTY_HOSTNAME=Server222

modify /etc/hosts

# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4 server222
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

See also