Apache, PHP, WordPress caching issue in Docker container

Question

I'm on OS X using the Virtualbox driver for docker. Using the official WordPress docker image, I setup a volume from my local machine to map to the container

/Users/gezimhome/projects/zr/src:/var/www/html/wp-content/plugins/zr

When I update files in the host, they show updated in the container but changes don't reflect on the website until a few minutes later. I suspect it might be Apache caching something as I don't have any WordPress caching plugins installed.

Update: I've not tried other types of files. The PHP files are not being updated when I load the site in the browser (or even using curl).

Update 2: Here's the .htaccess file. Here's the docker virtualbox info

Are there any issues with your port mappings? Have you checked your .htaccess file for any weird headers? — marblewraith
– marblewraith, Commented Feb 9, 2016 at 1:51
Also what's the config on the docker container in question? Have you allocated resources correctly? Enough RAM / CPU? — marblewraith
– marblewraith, Commented Feb 9, 2016 at 1:56

Gezim · Accepted Answer · 2016-02-09 18:03:33Z

20

It turns out this was caused by opcache in PHP. Opcache was enabled in the wordpress docker image as follows:

RUN { \
        echo 'opcache.memory_consumption=128'; \
        echo 'opcache.interned_strings_buffer=8'; \
        echo 'opcache.max_accelerated_files=4000'; \
        echo 'opcache.revalidate_freq=60'; \
        echo 'opcache.fast_shutdown=1'; \
        echo 'opcache.enable_cli=1'; \
    } > /usr/local/etc/php/conf.d/opcache-recommended.ini

So, I created a new docker image for wordpress that disables caching. It's essentially this:

FROM wordpress:latest
RUN rm -rf /usr/local/etc/php/conf.d/opcache-recommended.ini

answered Feb 9, 2016 at 18:03

Gezim

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4 Comments

auspicious_day Over a year ago

Nice find. You can also simply map a blank file over that one like: -v ./blankopcache/opcache-recommended.ini:/usr/local/etc/php/conf.d/opcache-recommended.ini

Jason Stallings Over a year ago

Thanks for this! Caching is not great while developing and there's nothing about the stack the official image uses online.

Damon Over a year ago

Wow that's awesome. This was driving me nuts.

Ap Koponen Over a year ago

You could also just add php_flag opcache.enable Off to your WordPress .htaccess, which disables the opcode caching.

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