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一、准备文件
将光盘centos/redhat放入光驱，进入Packages目录，或者将以下文件复制到要安装的系统中：
(1/5): cronie-1.4.4-15.el6.x86_64.rpm
(2/5): cronie-anacron-1.4.4-15.el6.x86_64.rpm
(3/5): crontabs-1.10-33.el6.noarch.rpm
(4/5): procmail-3.22-25.1.el6_5.1.x86_64.rpm
(5/5): sendmail-8.14.4-9.el6.x86_64.rpm
二、开始安装
[root@mysql1 crontabs]# rpm -ivh procmail-3.22-25.1.el6.x86_64.rpm
warning: procmail-3.22-25.1.el6.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY
Preparing... ########################################### [100%]
1:procmail ########################################### [100%]
[root@mysql1 crontabs]# rpm -ivh sendmail-8.14.4-8.el6.x86_64.rpm
warning: sendmail-8.14.4-8.el6.x86_64.rpm: Header V3 RSA/SHA256 Signature, key I D fd431d51: NOKEY
Preparing... ########################################### [100%]
1:sendmail ########################################### [100%]
[root@mysql1 crontabs]# rpm -ivh cronie-1.4.4-12.el6.x86_64.rpm
warning: cronie-1.4.4-12.el6.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY
error: Failed dependencies:
dailyjobs is needed by cronie-1.4.4-12.el6.x86_64
[root@mysql1 crontabs]# rpm -ivh cronie-1.4.4-12.el6.x86_64.rpm --nodeps
warning: cronie-1.4.4-12.el6.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY
Preparing... ########################################### [100%]
1:cronie ########################################### [100%]
[root@mysql1 crontabs]# rpm -ivh crontabs-1.10-33.el6.noarch.rpm
warning: crontabs-1.10-33.el6.noarch.rpm: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY
Preparing... ########################################### [100%]
1:crontabs ########################################### [100%]
[root@mysql1 crontabs]# rpm -ivh cronie-anacron-1.4.4-12.el6.x86_64.rpm
warning: cronie-anacron-1.4.4-12.el6.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY
Preparing... ########################################### [100%]
1:cronie-anacron ########################################### [100%]
[root@mysql1 crontabs]# crontab -l
no crontab for root
[root@mysql1 crontabs]# crontab -e
no crontab for root - using an empty one
crontab: no changes made to crontab
[root@mysql1 crontabs]# crontab -e
no crontab for root - using an empty one
crontab: installing new crontab
//查看是否是开机启动
[root@mysql1 crontabs]# chkconfig --list | grep cron
crond 0:off 1:off 2:on 3:on 4:on 5:on 6:off
[root@mysql1 crontabs]# chkconfig --list crond
crond 0:off 1:off 2:on 3:on 4:on 5:on 6:off
三、扩展阅读
使用rpm命令从redhat/centos系统盘安装计划任务程序crontab
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原文地址：http://www.cnblogs.com/kuili/p/5117671.html
