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Docker Library Bot 2018-01-03 17:08:37 -08:00
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@ -237,6 +237,18 @@ RUN curl -fsSL 'https://xcache.lighttpd.net/pub/Releases/3.2.0/xcache-3.2.0.tar.
&& rm -r /tmp/xcache
```
#### "`E: Package 'php-XXX' has no installation candidate"`"
As of [docker-library/php#542](https://github.com/docker-library/php/pull/542), this image blocks the installation of Debian's PHP packages. There is some additional discussion of this change in [docker-library/php#551 (comment)](https://github.com/docker-library/php/issues/551#issuecomment-354849074), but the gist is that installing Debian's PHP packages in this image leads to two conflicting installations of PHP in a single image, which is almost certainly not the intended outcome.
For those broken by this change and looking for a workaround to apply in the meantime while a proper fix is developed, adding the following simple line to your `Dockerfile` should remove the block (**with the strong caveat that this will allow the installation of a second installation of PHP, which is definitely not what you're looking for unless you *really* know what you're doing**):
```dockerfile
RUN rm /etc/apt/preferences.d/no-debian-php
```
The *proper* solution to this error is to either use `FROM debian:XXX` and install Debian's PHP packages directly, or to use `docker-php-ext-install`, `pecl`, and/or `phpize` to install the necessary additional extensions and utilities.
### Changing `DocumentRoot`
Some applications may wish to change the default `DocumentRoot` in Apache (away from `/var/www/html`). The following demonstrates one way to do so using an environment variable (which can then be modified at container runtime as well):