62 lines
2.6 KiB
Markdown
62 lines
2.6 KiB
Markdown
# What is Redis?
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Redis is an open-source, networked, in-memory, key-value data store with optional durability. It is written in ANSI C. The development of Redis has been sponsored by Pivotal since May 2013; before that, it was sponsored by VMware. According to the monthly ranking by DB-Engines.com, Redis is the most popular key-value store. The name Redis means REmote DIctionary Server.
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> [wikipedia.org/wiki/Redis](https://en.wikipedia.org/wiki/Redis)
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%%LOGO%%
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# How to use this image
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## start a redis instance
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```console
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$ docker run --name some-redis -d redis
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```
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This image includes `EXPOSE 6379` (the redis port), so standard container linking will make it automatically available to the linked containers (as the following examples illustrate).
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## start with persistent storage
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```console
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$ docker run --name some-redis -d redis redis-server --appendonly yes
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```
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If persistence is enabled, data is stored in the `VOLUME /data`, which can be used with `--volumes-from some-volume-container` or `-v /docker/host/dir:/data` (see [docs.docker volumes](http://docs.docker.com/userguide/dockervolumes/)).
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For more about Redis Persistence, see [http://redis.io/topics/persistence](http://redis.io/topics/persistence).
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## connect to it from an application
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```console
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$ docker run --name some-app --link some-redis:redis -d application-that-uses-redis
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```
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## ... or via `redis-cli`
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```console
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$ docker run -it --link some-redis:redis --rm redis sh -c 'exec redis-cli -h "$REDIS_PORT_6379_TCP_ADDR" -p "$REDIS_PORT_6379_TCP_PORT"'
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```
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## Additionally, If you want to use your own redis.conf ...
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You can create your own Dockerfile that adds a redis.conf from the context into /data/, like so.
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```dockerfile
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FROM redis
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COPY redis.conf /usr/local/etc/redis/redis.conf
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CMD [ "redis-server", "/usr/local/etc/redis/redis.conf" ]
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```
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Alternatively, you can specify something along the same lines with `docker run` options.
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```console
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$ docker run -v /myredis/conf/redis.conf:/usr/local/etc/redis/redis.conf --name myredis redis redis-server /usr/local/etc/redis/redis.conf
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```
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Where `/myredis/conf/` is a local directory containing your `redis.conf` file. Using this method means that there is no need for you to have a Dockerfile for your redis container.
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## `32bit` variant
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This variant is *not* a 32bit image (and will not run on 32bit hardware), but includes Redis compiled as a 32bit binary, especially for users who need the decreased memory requirements associated with that. See ["Using 32 bit instances"](http://redis.io/topics/memory-optimization#using-32-bit-instances) in the Redis documentation for more information.
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