月度归档：2014年10月

RHEL6与RHEL7的变化(转)

System and command changes between RHEL 6 and RHEL 7

Between RHEL6 and RHEL7 there are a number of changes to tools, commands, and workflows. Changes that are likely to affect common administrative tasks are listed here:

Anaconda RHEL installer completely redesigned¹
Legacy GRUB boot loader replaced by GRUB2²
Procedure for bypassing root password prompt at boot completely different³
SysV init system and all related tools replaced by systemd⁴
ext4 replaced by xfs as default filesystem type⁵
Directories /bin, /sbin, /lib and /lib64 are now all under the /usr directory⁶
Network interfaces have a new naming scheme based on physical device location (e.g., eth0 might become enp0s3)⁷
ntpd replaced by chronyd as the default network time protocol daemon⁸
GNOME2 replaced by GNOME3 as default desktop environment⁹
System registration and subscription now handled exclusively with Red Hat Subscription Management (RHSM)¹⁰
MySQL replaced by Mariadb¹¹
tgtd replaced by targetcli¹²
High Availability Add-On: RGManager removed as resource-management option (in favor of Pacemaker); all CMAN features merged into Corosync (qdiskd replaced by votequorum plugin); all tools unified into pcs¹³
ifconfig and route commands are further deprecated in favor of ip
netstat further deprecated in favor of ss
System user UID range extended from 0-499 to 0-999
locate no longer available by default; (available as mlocate package)
nc (netcat) replaced by nmap-ncat