在 docker 中通过主管执行 PHP 脚本

Question

我想定期在我的 docker 容器中执行一个 PHP 脚本，比方说每 5 分钟一次 - 使用 supervisord 控制。

我的 Dockerfile:

FROM php:5.6-apache
RUN apt-get update && apt-get install -y \
    cron \
    rsyslog \
    supervisor

COPY supervisord/*.conf /etc/supervisor/conf.d/
COPY crontab /etc/cron.d/cron
RUN rm -Rf /etc/cron.daily  && \
    rm -Rf /etc/cron.weekly && \
    rm -Rf /etc/cron.monthly && \
    rm -Rf /etc/cron.hourly && \
    chmod a+x /etc/cron.d/cron

EXPOSE 80

CMD exec supervisord -n

我的crontab文件：

PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
*/5 * * * * root cd /var/www/html/market/autoFetch && /usr/local/bin/php fetchStock.php >/dev/null 2>&1

当我启动服务器时发生了什么：

php_1  | /usr/lib/python2.7/dist-packages/supervisor/options.py:298: UserWarning: Supervisord is running as root and it is searching for its configuration file in default locations (including its current working directory); you probably want to specify a "-c" argument specifying an absolute path to a configuration file for improved security.    
php_1  |   'Supervisord is running as root and it is searching '
php_1  | 2018-08-26 08:45:52,515 CRIT Supervisor running as root (no user in config file)
php_1  | 2018-08-26 08:45:52,516 INFO Included extra file "/etc/supervisor/conf.d/supervisord.conf" during parsing
php_1  | 2018-08-26 08:45:52,522 INFO RPC interface 'supervisor' initialized
php_1  | 2018-08-26 08:45:52,523 CRIT Server 'unix_http_server' running without any HTTP authentication checking
php_1  | 2018-08-26 08:45:52,523 INFO supervisord started with pid 1
php_1  | 2018-08-26 08:45:53,526 INFO spawned: 'cron' with pid 8
php_1  | 2018-08-26 08:45:53,528 INFO spawned: 'rsyslogd' with pid 9
php_1  | 2018-08-26 08:45:53,531 INFO spawned: 'apache2' with pid 10
php_1  | 2018-08-26 08:45:54,607 INFO success: cron entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
php_1  | 2018-08-26 08:45:54,607 INFO success: rsyslogd entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
php_1  | 2018-08-26 08:45:54,607 INFO success: apache2 entered RUNNING state, process has stayed up for > than 1 seconds (startsecs)
php_1  | 2018-08-26 09:00:11,493 INFO reaped unknown pid 21
...

服务器是运行 & 它看起来 cronjob 正在按预期工作，但是在执行 php 脚本（创建文件）后我期望的输出没有发生。

我肯定交叉检查了我的命令：

cd /var/www/html/market/autoFetch && /usr/local/bin/php fetchStock.php >/dev/null 2>&1

它将创建我希望脚本创建的文件（这需要一些时间，因为要获取大量数据）并且它将 PHP 中回显的任何内容输出到我的终端。

你知道哪里会出错吗？

Answer 1

这不是 Docker 的问题，而是您的设置问题。你的/usr/local/bin/php fetchStock.php >/dev/null 2>&1是做什么的，解释in detail in here，我复制过来：

>/dev/null redirects standard output (stdout) to /dev/null, which discards it.

...

2>&1 redirects standard error (2) to standard output (1), which then discards it as well since standard output has already been redirected.

你应该只保留 /usr/local/bin/php fetchStock.php...

在 docker 中通过主管执行 PHP 脚本

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