Basic

Partition

• /boot
• /
• swap

Hostname

• hostnamectl
• hostnamectl set-hostname Linux001

Network

• ip address
• vi /etc/sysconfig/network-scripts/ifcfg-eth0
• BOOTPROTO=static
• ONBOOT=yes
• IPADDR=192.168.200.10
• NETMASK=255.255.255.0
• GATEWAY=192.168.200.1
• DNS1=114.114.114.114
• DOMAIN=corp.alphabook.cn
• systemctl restart network
• CentOS 7 NetworkManager Keeps Overwriting /etc/resolv.conf
  • Check DNS related configuration in /etc/sysconfig/network-scripts/ifcfg-ens32
• ifdown eth0
• ifup eth0
• More bond

Time

• timedatectl
• timedatectl list-timezones | grep Asia
• timedatectl set-timezones Asia/Shanghai
• cat /etc/chrony.conf
• Or ntp
• systemctl stop chronyd.service
• systemctl disable chronyd.service
• yum install ntp
• systemctl start ntpd.service
• systemctl enable ntpd.service

Service

• systemctl status ssh
• systemctl start ssh
• systemctl stop ssh
• systemctl restart ssh
• systemctl reload ssh
• systemctl enable ssh
• systemctl disable ssh
• systemctl is-enabled ssh
• systemctl is-active ssh
• systemctl show ssh

Disk

• df -h
• fdisk -l
• fdisk -l /dev/sda
• more about fdisk

Firewall

• systemctl status firewalld
• firewall-cmd --get-default-zone
• firewall-cmd --set-default-zone=internal
• firewall-cmd --get-services
• firewall-cmd --permanent --add-service=http
• firewall-cmd --permanent --add-rich-rule='rule family=ipv4 source address=192.168.1.100 service name=mysql accept'
• firewall-cmd --reload
• firewall-cmd --list-services
• firewall-cmd --list-all

SELinux

• sestatus
• getenforce
• setenforce
• vi /etc/selinux/config
• semanage port -a -t mysqld_port_t -p tch 3306
• semanage port -l |grep mysqld

Mount

• mount /dev/cdrom /media
• mount -o loop xxx.iso /media
• mount -t nfs filer01.corp.alphabook.cn:/Department /Department
• vi /etc/fstab
• filer01:/Department /Department nfs4 rsize=65536,wsize=65536,hard,tcp 0 0
• autofs

Permission

• r=read=4 w=write=2 x=execute=1
• u=user g=group o=other
• chmod 755 file01
• chmod go+x file01
• chown User01.Group01 file01
• chgrp Group01 file01

rpm & yum

• rpm -ivh packagename-version-arch.rpm
• rpm -qa
• yum info samba
• yum install samba
• yum update samba
• yum remove samba
• yum update
• yum group list
• yum group info "Basic Web Server"
• yum group install "Basic Web Server"
• yum provides mysql
• yum install epel-release
• Change yum repository
  • yum install wget
  • cd /etc/yum.repos.d
  • mv CentOS-Base.repo CentOS-Base_bk
  • wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
  • yum makecache
  • yum update -y

crontabs

• yum install crontabs
• systemctl status crond
• systemctl enable crond
• systemctl is-enabled crond
• cat /etc/crontab
• # Example of job definition:
• # .---------------- minute (0 - 59)
• # | .------------- hour (0 - 23)
• # | | .---------- day of month (1 - 31)
• # | | | .------- month (1 - 12) OR jan,feb,mar,apr ...
• # | | | | .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
• # | | | | |
• # * * * * * user-name command to be executed
• Examples:
  • 0 3 * * * root /root/scripts/dailybackup.sh
  • */30 * * * root /root/scripts/dailybackup.sh
• crontab /etc/crontab
• crontab -l
• chmod u+x /root/scripts/dailybackup.sh
• ls -l /root/scripts/dailybackup.sh
• cat /var/spool/mail/root

Advanced

• Advanced

Basic Ubuntu

• Basic-Ubuntu