README.md 3.2 KB
Supported tags and respective Dockerfile links
For more information about this image and its history, please see the relevant
manifest file
(library/memcached)
in the docker-library/official-images GitHub
repo.
What is Memcached?
Memcached is a general-purpose distributed memory caching system. It is often used to speed up dynamic database-driven websites by caching data and objects in RAM to reduce the number of times an external data source (such as a database or API) must be read.
Memcached's APIs provide a very large hash table distributed across multiple machines. When the table is full, subsequent inserts cause older data to be purged in least recently used order. Applications using Memcached typically layer requests and additions into RAM before falling back on a slower backing store, such as a database.
How to use this image
docker run -it --rm --name my-memcache memcached
Start your memcached container with the above command and then you can connect you app to it with standard linking:
docker run -it --link my-memcache:memcache my-app-image
The memcached server information would then be available through the ENV
variables generated by the link as well as through DNS as memcache from
/etc/hosts.
For infomation on configuring your memcached server, see the extensive wiki.
Known Issues
As of 1.4.21, memcached does not handle SIGTERM, so a standard docker stop
will not stop it gracefully, but will resort to SIGKILL after the 10 second
timeout. Use docker kill -s INT to do a clean stop of the memcached
container. There is a PR to
change this behavior upstream.
License
View license information for the software contained in this image.
Supported Docker versions
This image is officially supported on Docker version 1.4.1.
Support for older versions (down to 1.0) is provided on a best-effort basis.
User Feedback
Issues
If you have any problems with or questions about this image, please contact us through a GitHub issue.
You can also reach many of the official image maintainers via the
#docker-library IRC channel on Freenode.
Contributing
You are invited to contribute new features, fixes, or updates, large or small; we are always thrilled to receive pull requests, and do our best to process them as fast as we can.
Before you start to code, we recommend discussing your plans through a GitHub issue, especially for more ambitious contributions. This gives other contributors a chance to point you in the right direction, give you feedback on your design, and help you find out if someone else is working on the same thing.