????????????ū?弸??????
????1. “?????”??“??????”
?????????: ??????????????? date ???????????linux???????е???????????????????????????????????????????
??????????: ??????BIOS?е???????????????????????У?????????????????????????????趨?????????????????????????趨?????????????????????????????????????????????????
??????????????????????
????1. ????? date
?????????? date??????????????????????UTC?????????? date -u??
????2. ?????? /sbin/hwclock
?????????? /sbin/hwclock ?????????? BIOS ?е??????δ???????? /etc/sysconfig/clock ???????????UTC???????????UTC??UTC=true?????????????????????????????????BIOS?????????????????? --localtime ????????????? BIOS ?????????.
????????????????????????????????????????????????(???????й?????CST??????????)??
???????A: ???UTC????linux?? /etc/sysconfig/clock ?? UTC=true??
????????: BIOS------->UTC????BIOS?е???俴????UTC??------(????仯)----->CST
???????: CST -------(????仯)----->UTC-------?洢??------>BIOS
???????B: ?????UTC????linux?? /etc/sysconfig/clock ?? UTC=false??
????????: BIOS--------------------->CST????BIOS?е???俴????CST??
???????: CST ---------?洢??------>BIOS
???????????????????????
??????????????????????????hwclock???
????//??????????????????????
????[root@localhost ~]# hwclock --systohc <== sys???????to??д????hc??Hard Clock??
????[root@localhost ~]# hwclock -w
????//??????????????????????
????[root@localhost ~]# hwclock --hctosys
????[root@localhost ~]# hwclock -s
????------------------------------------------------------------------------------------
????????crontab??ntp????????????
????*/30 * * * * /usr/sbin/ntpdate puppetmaster.com.cn???????????????????? >>/root/ntdate.log 2>&1 && /sbin/clock --systohc