How to enable APK caching
Enabling Package Caching
Package caching is useful when the need arises to upgrade packages on read-only media. Package caching allows you to store newer packages in a location on writable media, which Alpine checks for when loading packages on start-up.
This can be enabled either from the console or through the ACF.
Edit the /etc/apk/repositories file using an editor ( for instance) and if necessary, add references to the Alpine package repositories. In the example below, the file references the Alpine CD, so that if a requested package is available on the local media, it will be obtained from there instead of being downloaded from the remote repository:
To upgrade, in this example, from version 3.3 to 3.4, simply change:
So that the file will look like this:
Above, only one possible repository is shown, however,
http://dl-3.alpinelinux.org/alpine/ may also be replaced with any geographically close mirror from:
Updating package lists
With the correct repositories file in place, the latest index list of available packages can be obtained with:
Enable caching from the console
Substitute 'sda1' in the example below for the actual device you will use to store the caching directory.
First upgrade apk-tools:
apk add –u apk-tools
Now enable package caching:
mkdir –p /media/sda1/cache ln –s /media/sda1/cache /etc/apk/cache
From the ACF
Browse to System > Packages > Cache
Edit Cache Settings:
Tick Enable Cache
Specify the Cache Directory, for example: