how to run SolrCloud with docker-compose - docker

Question

Please help me with docker-compose file.
Right now, i'm using Solr in docker file, but i need to change it to SolrCloud. I need 2 Solr instances, an internal Zookeeper and docker (local).
This is an example of docker-compose file I did:
version: "3"
services:
mongo:
image: mongo:latest
container_name: mongo
hostname: mongo
networks:
- gsec
ports:
- 27018:27017
sqlserver:
image: microsoft/mssql-server-linux:latest
hostname: sqlserver
container_name: sqlserver
environment:
SA_PASSWORD: "#Password123!"
ACCEPT_EULA: "Y"
networks:
- gsec
ports:
- 1403:1433
solr:
image: solr
container_name: solr
ports:
- "8983:8983"
networks:
- gsec
volumes:
- data:/opt/solr/server/solr/mycores
entrypoint:
- docker-entrypoint.sh
- solr-precreate
- mycore
volumes:
data:
networks:
gsec:
driver: bridge
Thank you in advanced.

Answer 1

Solr docker instance has a zookeeper server embedded into. You have just to start Solr with the right parameters and add the zookeeper ports 9983:9983 in the docker-compose file:
solr:
image: solr
container_name: solr
ports:
- "9983:9983"
- "8983:8983"
networks:
- gsec
volumes:
- data:/opt/solr/server/solr/mycores
entrypoint:
- docker-entrypoint.sh
- solr
- start
- -c
- -f
SolrCloud basically is a Solr cluster where Zookeeper is used to coordinate and configure the cluster.
Usually you use SolrCloud with Docker because you're are learning how it works or because you're preparing your application (locally?) to deploy in a bigger environment.
On the other hand it doesn't make much sense run SolrCloud if you don't have a distributed configuration, i.e. having Solr and Zookeeper running on different nodes.
SolrCloud is the kind of cluster you need when you have hundred or even thousands searches per second with collection of millions or even billions of documents.
Your cluster have to scale horizontally.

Answer 2

Version to use with external zookeper.
'-t' to change data dir in container.
To see other options run: solr start -help
version: '3'
services:
solr1:
image: solr
ports:
- "8984:8984"
entrypoint:
- solr
command:
- start
- -f
- -c
- -h
- "10.1.0.157"
- -p
- "8984"
- -z
- "10.1.0.157:2181,10.1.0.157:2182,10.1.0.157:2183"
- -m
- 1g
- -t
- "/opt/solr/server/solr/mycores"
volumes:
- "./data1/mycores:/opt/solr/server/solr/mycores"

Answer 3

I use this setup locally to test three instances of solr and three instances of zookeeper, based on the official example.
version: '3.7'
services:
solr-1:
image: solr:8.7
container_name: solr-1
ports:
- "8981:8983"
environment:
- ZK_HOST=zoo-1:2181,zoo-2:2181,zoo-3:2181
networks:
- solr
depends_on:
- zoo-1
- zoo-2
- zoo-3
# command:
# - solr-precreate
# - gettingstarted
solr-2:
image: solr:8.7
container_name: solr-2
ports:
- "8982:8983"
environment:
- ZK_HOST=zoo-1:2181,zoo-2:2181,zoo-3:2181
networks:
- solr
depends_on:
- zoo-1
- zoo-2
- zoo-3
solr-3:
image: solr:8.7
container_name: solr-3
ports:
- "8983:8983"
environment:
- ZK_HOST=zoo-1:2181,zoo-2:2181,zoo-3:2181
networks:
- solr
depends_on:
- zoo-1
- zoo-2
- zoo-3
zoo-1:
image: zookeeper:3.6
container_name: zoo-1
restart: always
hostname: zoo-1
volumes:
- zoo1data:/data
ports:
- 2181:2181
environment:
ZOO_MY_ID: 1
ZOO_SERVERS: server.1=0.0.0.0:2888:3888;2181 server.2=zoo-2:2888:3888;2181 server.3=zoo-3:2888:3888;2181
networks:
- solr
zoo-2:
image: zookeeper:3.6
container_name: zoo-2
restart: always
hostname: zoo-2
volumes:
- zoo2data:/data
ports:
- 2182:2181
environment:
ZOO_MY_ID: 2
ZOO_SERVERS: server.1=zoo-1:2888:3888;2181 server.2=0.0.0.0:2888:3888;2181 server.3=zoo-3:2888:3888;2181
networks:
- solr
zoo-3:
image: zookeeper:3.6
container_name: zoo-3
restart: always
hostname: zoo-3
volumes:
- zoo3data:/data
ports:
- 2183:2181
environment:
ZOO_MY_ID: 3
ZOO_SERVERS: server.1=zoo-1:2888:3888;2181 server.2=zoo-2:2888:3888;2181 server.3=0.0.0.0:2888:3888;2181
networks:
- solr
networks:
solr:
# persist the zookeeper data in volumes
volumes:
zoo1data:
driver: local
zoo2data:
driver: local
zoo3data:
driver: local