CentOS下使用yum命令安裝計劃任務程序crontab的方法

2020-10-28 18:44:54

字體：大中小

來源：轉載

供稿：網友

概述

利用“任務計劃”，可以將任何腳本、程序或文檔安排在某個最方便的時間運行。通俗的講就是定時執行某個腳本、程序。

常見用途

定時關機

定時檢查更新

定時對系統配置、數據庫、日志進行備份

定時清理垃圾文件

檢測是否已安裝

# crontab-bash: crontab: command not found

執行 crontab 命令如果報 command not found，就表明沒有安裝.

開始安裝

# yum -y install vixie-cronLoaded plugins: fastestmirror, refresh-packagekit, securityExisting lock /var/run/yum.pid: another copy is running as pid 25960.Another app is currently holding the yum lock; waiting for it to exit...

可能是系統自動升級正在運行，yum在鎖定狀態中。

可以通過強制關掉yum進程：

#rm -f /var/run/yum.pid

然后就可以使用yum了。

# yum -y install vixie-cronLoaded plugins: fastestmirror, refresh-packagekit, securityDetermining fastest mirrors * base: mirrors.btte.net * extras: mirrors.sina.cn * updates: mirrors.sina.cnbase                                         | 3.7 kB  00:00  extras                                         | 3.4 kB  00:00  extras/primary_db                                      | 32 kB  00:00  updates                                         | 3.4 kB  00:00  updates/primary_db                                      | 1.9 MB  00:07  Setting up Install ProcessResolving Dependencies--> Running transaction check---> Package cronie.x86_64 0:1.4.4-15.el6 will be installed--> Processing Dependency: dailyjobs for package: cronie-1.4.4-15.el6.x86_64--> Processing Dependency: /usr/sbin/sendmail for package: cronie-1.4.4-15.el6.x86_64--> Running transaction check---> Package cronie-anacron.x86_64 0:1.4.4-15.el6 will be installed--> Processing Dependency: crontabs for package: cronie-anacron-1.4.4-15.el6.x86_64---> Package sendmail.x86_64 0:8.14.4-9.el6 will be installed--> Processing Dependency: procmail for package: sendmail-8.14.4-9.el6.x86_64--> Running transaction check---> Package crontabs.noarch 0:1.10-33.el6 will be installed---> Package procmail.x86_64 0:3.22-25.1.el6_5.1 will be installed--> Finished Dependency ResolutionDependencies Resolved=============================================================================================================================================================================================== Package           Arch          Version            Repository        Size===============================================================================================================================================================================================Installing: cronie           x86_64         1.4.4-15.el6           base         74 kInstalling for dependencies: cronie-anacron         x86_64         1.4.4-15.el6           base         31 k crontabs           noarch         1.10-33.el6           base         10 k procmail           x86_64         3.22-25.1.el6_5.1          base         162 k sendmail           x86_64         8.14.4-9.el6           base         716 kTransaction Summary===============================================================================================================================================================================================Install  5 Package(s)Total download size: 994 kInstalled size: 2.1 MDownloading Packages:(1/5): cronie-1.4.4-15.el6.x86_64.rpm                                 | 74 kB  00:00  (2/5): cronie-anacron-1.4.4-15.el6.x86_64.rpm                               | 31 kB  00:00  (3/5): crontabs-1.10-33.el6.noarch.rpm                                 | 10 kB  00:00  (4/5): procmail-3.22-25.1.el6_5.1.x86_64.rpm                               | 162 kB  00:00  (5/5): sendmail-8.14.4-9.el6.x86_64.rpm                                 | 716 kB  00:00  -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------Total                                       1.3 MB/s | 994 kB  00:00  Running rpm_check_debugRunning Transaction TestTransaction Test SucceededRunning Transaction Installing : procmail-3.22-25.1.el6_5.1.x86_64                                   1/5  Installing : sendmail-8.14.4-9.el6.x86_64                                    2/5  Installing : cronie-1.4.4-15.el6.x86_64                                     3/5  Installing : crontabs-1.10-33.el6.noarch                                     4/5  Installing : cronie-anacron-1.4.4-15.el6.x86_64                                   5/5 ERROR:dbus.proxies:Introspect error on :1.2513:/org/freedesktop/PackageKit: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.Unable to send message to PackageKit Verifying : crontabs-1.10-33.el6.noarch                                     1/5  Verifying : cronie-anacron-1.4.4-15.el6.x86_64                                   2/5  Verifying : sendmail-8.14.4-9.el6.x86_64                                    3/5  Verifying : cronie-1.4.4-15.el6.x86_64                                     4/5  Verifying : procmail-3.22-25.1.el6_5.1.x86_64                                   5/5 Installed: cronie.x86_64 0:1.4.415.el6              Dependency Installed: cronie-anacron.x86_64 0:1.4.4-15.el6    crontabs.noarch 0:1.10-33.el6    procmail.x86_64 0:3.22-25.1.el6_5.1    sendmail.x86_64 0:8.14.4-9.el6    Complete!

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