RH系统管理——系统管理工具

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1、UNIT6:系统管理工具UNIT6:ObjectivesUponcompletionofthisunityoushouldbeableto:PerformtaskautomationwithatandcronConfiguresystemloggingMonitorsystemresourcesandactivitiesPerformbackupandrestoreUNIT6:agendaTaskautomationSystemloggingSystemmonitoringBakcupandrestore自动化任务Redhatlinuxprovidesthreefacilities

2、At–executeataskataspecifictimeCron–executetasksatscheduledintervalsAnacron–runtasksafter规定prescribedintervalshavepasswdUsingat适用于计划一次性任务UsecroninsteadforrecuringeventsUseatq,atrmtomanagejobsAtq–listspendingjobs(andjobids)atqAtrm–deletespendingjobbyjobidatrmjobidExample:attimexxxx-xx-xx$at6:00A

3、t>mailjoe

4、-r

5、-e]文件自动创建,list,rm,edit,userCrontab格式306**0

6、/home/joe/mailmom.shMinute0-59第30分钟,逗号Hour0-23第六个小时Day1-31第几天Month1-12第几个月Dayofweek0-6星期几Command命令;SystemcrontabfilesDifferentformatthanusercrontabfilesMastercrontabfile/etc/crontabrunsexecutablesinCat/etc/crontab/etc/cron.hourly/etc/cron.daily/etc/cron.weekly/etc/cron.monthly/etc/cron.d/direc

7、torycontainsadditionalsystemcrontabfilesControllingaccesstocronRestrict/allowuseraccesstocron/etc/cron.allow/etc/cron.denyContainsusernamestoallow/denyaccessforUsinganacronDoesnotassumemachineispoweredatalltimes.NotadaemonlikecronUserfulonlaptops,workstationsOnlybyrootTheanacrontabfileSchedule

8、sanacrontasksCat/etc/anacrontabFormatdifferentfromcrontab710weekly.tasks/opt/bin/weekly.shInterval(days)间隔Delay(min)10minlaternotatthesametimeLabelsuchasnameCommandUsingtmpwatchCleansoldfilesoutofspecifieddirectoriesUsefulforkeeping/tmpdirectoryfromfillingupTmpwatchisrundailyin/etc/cron.daily2

9、40个小时autodelbytmpwatch/tmpdirSystemlogconfigurationCentralizedsystemloggingLoggingdaemonsSyslogdklogdSystemlogconfiguration/etc/syslog.confConfiguressystemlogging/etc/sysconfig/syslogSetsswitchesusedwhenstartingsyslogdandklogdfromthesys