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Using the Create-Cluster Tool

Using create-cluster tool#

Once you clone the github folder you can navigate to utils/create-cluster. This expects you have compiled the program already and binaries have been built in the src folder.

You can see the readme file for this script, however we will go over a quick setup using this utility

You can create a config.sh script in this folder if you do not want to edit create-cluster.sh. If present it will use this rather than the defaults.

Whether you create you own config file or edit top of create-cluster.sh, the values you will update are:

PORT=30000 -->this is the starting port number to use for the cluster, however script may start at +1 so nodes would be 30001-30006 instead of 30000-30005. for purposes of this tutorial user PORT=29999
TIMEOUT=2000 -->timeout setting
NODES=6 -->the number of nodes in the cluster (port numbers incrementing from PORT setting)
REPLICAS=1 -->number of replicas. here we want one replica created for each master instance

if we specify 6 nodes, with one replica per master, we will end up with 3 masters and 3 replicas/slaves for this cluster setup.

to run simply start (launch cluster instances... runs instances of keydb-server with auto-appended config files instead of creating spearate) and create the cluster (keydb-cli --cluster create 127.0.0.1:30000 127.0.0.1:30001 127.0.0.1:30002 127.0.0.1:30003 127.0.0.1:30004 127.0.0.1:30005 --cluster-replicas 1) :

./create-cluster start
./create-cluster create

you will see there a bunch of cluster nodes and files creted now in this folder.

in order to stop the cluster:

./create-cluster stop

to clean up files in this folder:

./create-cluster clean

Testing the cluster setup#

connect with keydb-cli to port 30000 in cluster mode (-c) and try the following:

$ keydb-cli -c -p 30000
keydb 127.0.0.1:30000> set foo bar
-> Redirected to slot [12182] located at 127.0.0.1:30002
OK
keydb 127.0.0.1:30002> set hello world
-> Redirected to slot [866] located at 127.0.0.1:30000
OK
keydb 127.0.0.1:30000> get foo
-> Redirected to slot [12182] located at 127.0.0.1:30002
"bar"
keydb 127.0.0.1:30000> get hello
-> Redirected to slot [866] located at 127.0.0.1:30000
"world"
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