Database Backend Questions

JPRuehmann · by **JPRuehmann** » Fri Apr 18, 2014 09:17 Post

Hello I just Try out alternative Database Backens, namely the redis backend.
I created a new World, started it, open the world.mt and changed the backend setting to redis.
Started the geme anew and it tels me to put the redis_address and the redis_hash in the world_mt.
So I put the following lines in the world.mt redis_address = localhost, redis_hash = . Starting the Game gets me an empty world if I try redis_hash = backend norhing changes.
Where do I get this hash?
should not at least the redis_address be setted in the minetest.conf instead of the world.mt, because it is a client setting.
Thanks,
JPR

by **sfan5** » Fri Apr 18, 2014 17:34 Post

JPRuehmann wrote:Where do I get this hash?

Like I already said use any word you'd like.

JPRuehmann wrote:hould not at least the redis_address be setted in the minetest.conf instead of the world.mt, because it is a client setting.

The setting is not a client setting and is specific to the world.

joshburt · by **joshburt** » Fri Apr 25, 2014 15:35 Post

In order to get redis support working (on linux - which is does). I had to :

1. Setup and properly configure a redis server. Go do that first or find a hosted one you can use.

2. Build the c library used to link to during minetest compiling and runtime:
a. git clone and build this: https://github.com/redis/hiredis

3. Next I had to build Minetest with redis support enabled:
cmake . -DRUN_IN_PLACE=1 -DBUILD_CLIENT=0 -DUSE_REDIS=1 -DREDIS_LIBRARY=/home/josh/hiredis/libhiredis.so -DREDIS_INCLUDE_DIR=/home/josh/hiredis/

These options are the special sauce:
-DUSE_REDIS=1 -DREDIS_LIBRARY=/home/josh/hiredis/libhiredis.so -DREDIS_INCLUDE_DIR=/home/josh/hiredis/
(Where the REDIS library and directory are correctly updated for your environment).

4. Make the hiredis library available during runtime.
Afterwards I copied the libhiredis.so library to the base of the minetest directory and created a sym link for the version specified via an 'ldd' on the resultant minetestserver binary:
libhiredis.so.0.11 -> libhiredis.so

5. Configure minetestserver to use the redis server
Update the world data storage by updating the world.mt as follows:
backend = redis
redis_address = 192.16.0.38
redis_port = 6379
redis_hash = minetest_dev

(The port and hash are optional parameters). The backend and server portal are REQUIRED.

I then launch minetestserver normally (from the root minetest directory: ./bin/minetestserver). If you missed anything it core dumps on start-up. Otherwise it acts just like a normal server but block data is stored in redis. Pure awesome! This was the steps needed for redis support in Linux. Your milage will vary and depending on the platform you're building for you might need to perform additional steps.

JPRuehmann · by **JPRuehmann** » Fri Apr 25, 2014 18:26 Post

Hello
Sorry for my late reaction.
The Info that the hash is only the name for th Database on the Redis server was all i´ve needed, but thanks for all the other infos
backend = redis
redis_address = localhost
redis_hash = World
Works for me out of the box on a newly created minetest.
No configuration other than the World.mt needed.
Thanks,
JPR

joshburt · by **joshburt** » Fri Apr 25, 2014 22:08 Post

Glad to hear it! :)

dgm5555 · by **dgm5555** » Tue Feb 10, 2015 22:31 Post

So to set up with redis from scratch now that redis "is supported", what should I do. I've tried the following, but I get the error "Unknown map backend"

Install Redis