[英]Cron job on Ubuntu for php
I'm using Ubuntu on the server and I'm using Putty to access. 我在服务器上使用Ubuntu而我正在使用Putty访问。 I want to create cronjobs for my php site.
我想为我的php网站创建cronjobs。 How can I do this?
我怎样才能做到这一点?
If you mean that you want your php site to do some regular tasks, there are two possible ways. 如果你的意思是你希望你的php网站做一些常规任务,有两种可能的方法。
1) You use cron to pull a certain page regularly. 1)您使用cron定期拉出某个页面。 You can do this with a text-based browser, eg lynx.
您可以使用基于文本的浏览器执行此操作,例如lynx。 You pull your script like this:
你像这样拉你的脚本:
* * * * * /usr/bin/lynx http://yourhost.com/cron.php -dump > /dev/null
(This will call it every minute. That way you can build your own schedule inside your application) (这将每分钟调用一次。这样你就可以在你的应用程序中建立自己的计划)
2) You call your script with the command line php interpreter: 2)使用命令行php interpreter调用脚本:
* * * * * /usr/bin/php /path/to/cron.php > /dev/null
Generally solution two is better. 通常解决方案二更好。 However you will need access to the box.
但是,您需要访问该框。 The cron in solution one can be triggered from a different host, if you cannot install crons on the host.
如果您无法在主机上安装crons,则可以从其他主机触发解决方案一中的cron。
Also beware of a common pitfall using the command line version of php. 还要注意使用php的命令行版本的常见陷阱。 On debian (and potentially other systems) there may be seperate php.ini files for cgi, cli and mod_php.
在debian(以及可能的其他系统)上,可能存在用于cgi,cli和mod_php的单独的php.ini文件。 If you have customized your configuration make sure that the command line php is using the correct one.
如果您已自定义配置,请确保命令行php使用正确的配置。 You can test this with:
您可以使用以下方法测试:
/usr/bin/php -i | less
In response to the comment by dimo i made some benchmarks. 为了回应dimo的评论,我做了一些基准测试。 I called a simple local php script (which just echos "test") 1000 times with lynx, wget and php-cli:
我用lynx,wget和php-cli调用了一个简单的本地php脚本(只是echos“test”)1000次:
kbsilver:temp kbeyer$ time . wget.sh
real 0m14.223s
user 0m2.906s
sys 0m6.335s
(Command: wget -O /dev/null "localhost/test.php"; 2> /dev/null)
kbsilver:temp kbeyer$ time . lynx.sh
real 0m26.511s
user 0m5.789s
sys 0m9.467s
(Command: lynx -dump "localhost/test.php"; > /dev/null)
kbsilver:temp kbeyer$ time . php_cli.sh
real 0m54.617s
user 0m28.704s
sys 0m18.403s
(Command: /opt/local/bin/php /www/htdocs/test.php > /dev/null)
Server is lighttpd
, php(fastcgi)
with apc (on Mac OS X). 服务器是
lighttpd
, php(fastcgi)
和apc(在Mac OS X上)。
It turns out that indeed wget is the best tool for the job regarding speed. 事实证明,wget确实是速度工作的最佳工具。
So the result of php-cli
is not that suprising as the other methods reuse an already running php thread with opcode cache. 因此,
php-cli
的结果并不令人惊讶,因为其他方法重用已经运行的带有操作码缓存的php线程。
So the only real advantage of using php-cli is security as the script will not be available from outside as you can put it outside the docroot. 所以使用php-cli的唯一真正优势是安全性,因为脚本不能从外部获得,因为你可以把它放在docroot之外。
(This test is obviously not 100% accurate, but the differences are quite obvious in my opinion) (这个测试显然不是100%准确,但在我看来差异非常明显)
I'm asssuming you want to backup your PHP site? 我很想你要备份你的PHP网站? Edit the crontab using:
使用以下命令编辑crontab:
crontab -e
This will start up an instance of vi in which you can edit the crontab, press i for insert mode. 这将启动一个vi实例,您可以在其中编辑crontab,按i进行插入模式。 You then need to put in the information for when the cron entry will run and the command to run at that time, eg:
然后,您需要输入cron条目运行时的信息以及当时运行的命令,例如:
30 10 * * * tar -zcvf ./myphpsite.tar.gz /var/www/phpsite
So the command above will tar gzip your phpsite in /var/www/phpsite at 10:30pm every day. 因此,上面的命令将每天晚上10:30在/ var / www / phpsite中对您的phpsite进行gzip。 Exit and quit vi with :wq
退出并退出vi :wq
See this for further reference: 有关进一步参考,请参阅此
http://www.adminschoice.com/docs/crontab.htm http://www.adminschoice.com/docs/crontab.htm
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