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CentOS (Community Enterprise Operating System)

Fedora is the community distribution that forms the basis of CentOS.

CentOS is RPM-based and uses yum.

Commands

General

# get information on running CentOS
cat /etc/centos-release
# switch between keyboard layouts
loadkeys fr
# look at drive disk space
df -h

Packages

sudo yum install sysstat
mpstat

Network

# display general network info
ifconfig
# when you edit a network config
service network restart
# check SSH daemon status
service sshd status
# stop/disable the firewall
systemctl stop firewalld
systemctl disable firewalld

Example of /etc/sysconfig/network-scripts/ifcfg-xxxx:

TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=static
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=xxxx
UUID=xxxx-xxxxx-xxxxxx
DEVICE=xxxx
ONBOOT=yes
IPADDR=10.115.100.91
PREFIX=24
GATEWAY=10.115.100.254
DNS1=10.115.100.1
DOMAIN=mydomain.lan

User

# give a user sudo permission (wheel group created by default)
sudo usermod -a -G wheel myusername
# review sudo config
cat /etc/sudoers

Services

# look at services
chkconfig
# get current run level
runlevel
# get all existing services
service --status-all