├── .gitignore
├── Dockerfile
├── README.md
├── docker-compose.yml
└── docker-entrypoint.sh


/.gitignore:
--------------------------------------------------------------------------------
1 | data/*
2 | 


--------------------------------------------------------------------------------
/Dockerfile:
--------------------------------------------------------------------------------
1 | FROM rethinkdb:latest
2 | COPY docker-entrypoint.sh /docker-entrypoint.sh
3 | ENTRYPOINT ["/docker-entrypoint.sh"]
4 | 
5 | # checking for empty command in entrypoint.sh to allow runtime override
6 | CMD [""]
7 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # rethinkdb-docker-cluster
 2 | 
 3 | For auto-build image, head over to docker hub: https://hub.docker.com/r/kallqvist/rethinkdb-cluster/
 4 | 
 5 | A docker image to make RethinkDb clustering a bit easier and more container friendly.
 6 | This image is built on top of rethinkdb:latest and adds a docker-entrypoint.sh that dynamically tries to set canonical IP and join IP based on docker links and hostnames.
 7 | 
 8 | Basic usage is either (only for DNS-based service discovery):
 9 | - Start one container and set environment variable "JOIN" to a hostname able to reach the container's scaled nodes (e.g usually the container name)
10 | - Simply scale this service to add more nodes
11 | 
12 | __or:__
13 | - Manually start nodes as you wish
14 | - Add them to cluster by setting their environment variable "JOIN" to either hostname or IP of an already running node.
15 | 
16 | Check https://github.com/kallqvist/rethinkdb-docker-cluster/blob/master/docker-compose.yml for more information.
17 | 
18 | Container data is written to /data, each container must have a __unique__ storage path if host bind mounts are used to not risk data corruption.
19 | 


--------------------------------------------------------------------------------
/docker-compose.yml:
--------------------------------------------------------------------------------
 1 | rdb1:
 2 |   image: kallqvist/rethinkdb-cluster
 3 |   ports:
 4 |     - 8080:8080
 5 |   environment:
 6 |     JOIN: rdb1
 7 |   volumes:
 8 |     - ./data/rdb01:/data
 9 | 
10 | rdb2:
11 |   image: kallqvist/rethinkdb-cluster
12 |   links:
13 |     - rdb1
14 |   environment:
15 |     JOIN: rdb1
16 |   volumes:
17 |     - ./data/rdb02:/data
18 | 


--------------------------------------------------------------------------------
/docker-entrypoint.sh:
--------------------------------------------------------------------------------
 1 | #!/bin/bash -e
 2 | 
 3 | cmd="$@"
 4 | if [ ${#cmd} -ge 1 ]; then
 5 | 	exec "$@"
 6 | else
 7 | 	canonical_address=$(hostname -i)
 8 | 	run_cmd="/usr/bin/rethinkdb --bind all"
 9 | 	run_cmd="${run_cmd} -d /data"
10 | 	run_cmd="${run_cmd} --canonical-address ${canonical_address}:29015"
11 | 	if [ -n "$JOIN" ]; then
12 | 		join_resolved=$(eval "getent hosts ${JOIN}" | awk '{ print $1}')
13 | 		# ensure that we're not trying to join ourselves
14 | 		resolved_result=""
15 | 		for i in $join_resolved; do
16 | 			if [ $i != $canonical_address ]; then
17 | 				resolved_result="${resolved_result} ${i}"
18 | 			fi
19 | 		done
20 | 		# ensure we're only trying to join a single IP
21 | 		resolved_result=$(echo "$resolved_result" | awk '{ print $1 }')
22 | 		# only add join part of command if another IP remaining
23 | 		if [ -n "$resolved_result" ]; then
24 | 			run_cmd="${run_cmd} -j ${resolved_result}:29015"
25 | 		fi
26 | 	fi
27 | 	exec $run_cmd
28 | fi
29 | 


--------------------------------------------------------------------------------