如何在Centos上安装crontab [英] How to install crontab on Centos

问题描述

我熟悉使用 crontab -e 命令在我的 centos 上设置cron调度程序。但是今天我发现我的一个 centos 服务器没有这个命令

I am familiar to setup the cron scheduler using crontab -e command on my centos. But today I found one of my centos servers doesn't have this command

我试图安装这个 yum install crontab 但没有运气。然后我尝试了 yum install crontabs 并安装了一些

I have tried to install this using yum install crontab but no luck. Then I tried yum install crontabs and it installed something

=============================================================================
 Package                 Arch       Version          Repository        Size 
=============================================================================
Updating:
 crontabs                noarch     1.10-11.el5      base              7.0 k

Transaction Summary
=============================================================================
Install      0 Package(s)         
Update       1 Package(s)         
Remove       0 Package(s)         

Total download size: 7.0 k
Is this ok [y/N]:

但是 crontab 命令不起作用。如果我做 cat / etc / crontab ，那么它显示如下thing

But still the crontab command doesn't work. If I do cat /etc/crontab then it shows below thing

SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin
MAILTO=root
HOME=/

# run-parts
40 * * * * root run-parts /etc/cron.hourly
54 1 * * * root run-parts /etc/cron.daily
14 3 * * 0 root run-parts /etc/cron.weekly
38 1 16 * * root run-parts /etc/cron.monthly

我应该如何在该特定服务器上安装 crontab ？我使用 CentOS版本5.2（最终）。

What should I do to have crontab on that particular server? I am using CentOS release 5.2 (Final).

grep on cron显示：

grep on cron shows:

[root~]# ps -ef | grep cron
root     24022 24001  0 19:07 pts/1    00:00:00 grep cron

启动cron服务返回：

starting cron service returns:

[root~]# service cron start
cron: unrecognized service

推荐答案

如在CentOS上安装crontab ，CentOS中的crontab包是 vixie- cron 。因此，请安装它：

As seen in Install crontab on CentOS, the crontab package in CentOS is vixie-cron. Hence, do install it with:

yum install vixie-cron

然后用：

service crond start

要使其持久化，以便在启动时启动，请使用：

To make it persistent, so that it starts on boot, use:

chkconfig crond on

---

在CentOS 7上，您需要使用 cronie ：

yum install cronie

在CentOS 6上可以安装 vixie- cron ，但实际包是 cronie ：

yum install vixie-cron

和

yum install cronie

相同的输出：

.../...
==================================================================
 Package         Arch       Version         Repository      Size
==================================================================
Installing:
 cronie          x86_64     1.4.4-12.el6    base             73 k
Installing for dependencies:
 cronie-anacron  x86_64     1.4.4-12.el6    base             30 k
 crontabs        noarch     1.10-33.el6     base             10 k
 exim            x86_64     4.72-6.el6      epel            1.2 M

Transaction Summary
==================================================================
Install       4 Package(s)

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