RHEL/CentOS v.s. Ubuntu Differences (Commands and Configuration)

Differences

Note	RHEL	Ubuntu
Support	10years	10years LTS(Long Term Support)
Defautl Editor	vi	nano
Access control	SELinux	AppArmor
Apach HTTP Server	httpd	apache2
Firewall	firewalld (CentOS7) iptables (CentOS5, 6)	ufw（Uncomplicated FireWall）

The apt command is a command for integration of apt-get / apt-cache. Let's use only apt from now on.

Note	CentOS	Ubuntu
Repository configuration file	/etc/yum.repos.d/*.repo	/etc/apt/sources.list
Repository configuration file	/etc/yum.conf	/etc/apt/apt.conf （Create） Proxy Configuration `Acquire::http::Proxy "http://x.x.x.x:8888/";`
Package search	yum search STRINGS	apt search STRINGS
Package search		apt list PACKAGE apt list php
Package Detail	yum info PACKAGE	apt show PACKAGE apt show php
Package installation	yum install PACKAGE	apt install PACKAGE apt -f install PACAGE ← Repair broken dependencies
Package uninstall	yum remove PACKAGE	apt purge PACKAGE
List of repositories	yum list	apt list
Repository update	Automatic update every time	apt update ← In Ubuntu you need to do
Update installed packages		apt-get upgrade

Note	CentOS	Ubuntu
Package installation	rpm -i PACKAGE.rpm	dpkg -i PACKAGE.deb
List of installed packages	rpm -qa rpm -qa \|grep xxx	dpkg -l \|grep XXX dpkg -l \|grep ^ii (Also show deleted packages)
Confirm installed package	rpm -q PACKAGE	dpkg -l PACKAGE
List of files included in package	rpm -ql PACKAGE	dpkg -L PACKAGE
Package confirmation including file	rpm -qf PACKAGE	dpkg -S PACKAGE
Package uninstall	rpm -e PACKAGE	dpkg -P PACKAGE

Note	CentOS6	CentOS7	Ubuntu
Service status check	service SERVICE status /etc/init.d/SERVICE status	systemctl UNIT status	service SERVICE status /etc/init.d/SERVICE status
Start service	service SERVICE start /etc/init.d/SERVICE start	systemctl UNIT start	service SERVICE start /etc/init.d/SERVICE start
Stop service	service SERVICE stop /etc/init.d/SERVICE stop	systemctl UNIT stop	service SERVICE stop /etc/init.d/SERVICE stop
Automatic start setting confirmation	chkconfig --list		ls -l /etc/rc*.d/ sysv-rc-conf --list (apt-get install sysv-rc-conf)
Automatic start enable	chkconfig SERVICE on	systemctl enable UNIT	update-rc.d SERVICE enable
Disable auto start	chkconfig SERVICE off	systemctl enable UNIT	update-rc.d SERVICE disable
Auto start service added	chkconfig --add SERVICE		insserv -d SERVICE
Automatic start service deletion	chkconfig --del SERVICE		insserv -r SERVICE
Service setting file	/etc/sysconfig/SERVICE		/etc/default/SERVICE

Note	CentOS	Ubuntu
Apache/httpd	/etc/httpd/httpd.conf	/etc/apache2/apache2.conf
mysql	/etc/my.cnf	/etc/mysql/my.cnf
php	/etc/php.ini	/etc/php5/apache2/php.ini(For the web) /etc/php5/cli/php.ini(For Command) /etc/php5/conf.d/*.ini(For the web adn Command)

Note	CentOS	Ubuntu
OS Version	/etc/redhat-release /etc/issue Tips:cat /etc/*release	/etc/lsb-release /etc/issue Tips:cat /etc/*release
Hostname	/etc/sysconfig/network	/etc/hostname
Network Interfaces	/etc/sysconfig/network-scripts/ifcfg-X Example /etc/sysconfig/network-scripts/ifcfg-eth0	/etc/network/interfaces
Defautlt Gateway Configuration	/etc/sysconfig/network	/etc/network/interfaces
Run Level	/etc/inittab
Lang	/etc/sysconfig/i18n	/etc/default/locale Modification method update-locale LANG=ja_JP.UTF-8 Check Locale locale #Confirm current locale localectl list-locales #List of available locales apt install language-pack-ja
Timezone		Modification method dpkg-reconfigure tzdata
Keybord	/etc/sysconfig/keyboard	/etc/default/keyboard Modification method dpkg-reconfigure keyboard-configuration
cron	/var/spool/cron/USER	/var/spool/cron/crontabs/USER

Note	CentOS	Ubuntu
DNS	/etc/resolv.conf	/etc/resolv.conf
hosts	/etc/hosts	/etc/hosts