System Settings

MAC OS Connect Warning

ssh USER@HOST

# -bash: warning: setlocale: 
# LC_CTYPE: cannot change locale (UTF-8): No such file or directory

locale

# LANG=en_US.UTF-8
# LC_CTYPE=UTF-8
# These two options are different, they should be same.

vim /etc/locale.conf

# LANG="en_US.UTF-8"
# append: LC_CTYPE="en_US.UTF-8"

exit

Modify the name of the network card to " eth0 "

cd /etc/sysconfig/network-scripts/

mv ifcfg-ens33 ifcfg-eth0

vim ifcfg-eth0
# modify: NAME=eth0
# modify: DEVICE=eth0

vim /etc/default/grub

# GRUB_CMDLINE_LINUX append: biosdevname=0 net.ifnames=0

grub2-mkconfig -o /boot/grub2/grub.cfg

systemctl reboot

Hostname setting

CentOS 6

vim /etc/sysconfig/network

# HOSTNAME=<HOSTNAME>

vim /etc/hosts

# hosts文件中添加：127.0.0.1   <HOSTNAME>

hostname <HOSTNAME>

exec bash

CentOS 7

hostnamectl set-hostname <HOSTNAME>

vim /etc/hosts

# hosts文件中添加：127.0.0.1   <HOSTNAME>

exec bash

System Time setting

date -s "2000/11/1 00:00:00"

clock -w

# Set the Hardware Clock to the current System Time.

Filesystem mount or unmount

Mount a filesystem

mount /dev/cdrom /mnt

Unmount a filesystem

umount /mnt

Config system startup auto mount

vim /etc/fstab

SELinux setting

View SELinux state

getenforce

Open SELinux temporarily

setenforce 1

Close SELinux temporarily

setenforce 0

Set SELinux state permanently

vim /etc/selinux/config

Firewall setting

CentOS 6 - iptables

service iptables status

service iptables start
service iptables stop
service iptables restart

/etc/init.d/iptables start
/etc/init.d/iptables stop
/etc/init.d/iptables restart

chkconfig iptables on
chkconfig iptables off

CentOS 7 - firewalld

systemctl status firewalld.service

systemctl start firewalld.service
systemctl stop firewalld.service
systemctl restart firewalld.service

systemctl enable firewalld.service
systemctl disable firewalld.service