docker-compose.yml

version: '2'
services:
    zk1:
        image: 31z4/zookeeper
        restart: always
        environment:
            ZOO_MY_ID: 1
            ZOO_SERVERS: server.1=zk1:2888:3888 server.2=zk2:2888:3888 server.3=zk3:2888:3888
        networks:
            solr_cluster:
                aliases:
                    - zk1

    zk2:
        image: 31z4/zookeeper
        restart: always
        environment:
            ZOO_MY_ID: 2
            ZOO_SERVERS: server.1=zk1:2888:3888 server.2=zk2:2888:3888 server.3=zk3:2888:3888
        networks:
            solr_cluster:
                aliases:
                    - zk2

    zk3:
        image: 31z4/zookeeper
        restart: always
        environment:
            ZOO_MY_ID: 3
            ZOO_SERVERS: server.1=zk1:2888:3888 server.2=zk2:2888:3888 server.3=zk3:2888:3888
        networks:
            solr_cluster:
                aliases:
                    - zk3

    solr1:
        image: solr:alpine
        command: bash -c '/opt/solr/bin/solr start -f -z zk1:2181,zk2:2181,zk3:2181'
        depends_on:
            - zk1
            - zk2
            - zk3
        networks:
            solr_cluster:
                aliases:
                    - solr1

    solr2:
        image: solr:alpine
        command: bash -c '/opt/solr/bin/solr start -f -z zk1:2181,zk2:2181,zk3:2181'
        depends_on:
            - zk1
            - zk2
            - zk3
        networks:
            solr_cluster:
                aliases:
                    - solr2

    solr3:
        image: solr:alpine
        command: bash -c '/opt/solr/bin/solr start -f -z zk1:2181,zk2:2181,zk3:2181'
        depends_on:
            - zk1
            - zk2
            - zk3
        networks:
            solr_cluster:
                aliases:
                    - solr3

    solr4:
        image: solr:alpine
        command: bash -c '/opt/solr/bin/solr start -f -z zk1:2181,zk2:2181,zk3:2181'
        depends_on:
            - zk1
            - zk2
            - zk3
        networks:
            solr_cluster:
                aliases:
                    - solr4

    haproxy:
        image: haproxy:alpine
        volumes:
            - ./haproxy.cfg:/usr/local/etc/haproxy/haproxy.cfg:ro
        ports:
            - 28983:8983
            - 22181:2181
        depends_on:
            - solr1
            - solr2
            - solr3
            - solr4
        networks:
            solr_cluster:
                aliases:
                    - haproxy

networks:
    solr_cluster:
        driver: bridge

haproxy.cfg

global
	maxconn 4096
	daemon
	#debug
	#quiet

defaults
	log	global
	mode	http
	retries	3
	redispatch
	maxconn	2000
	contimeout	5000
	clitimeout	50000
	srvtimeout	50000

listen solr-in
	bind *:8983
	balance roundrobin
	server solr1 solr1:8983
	server solr2 solr2:8983
	server solr3 solr3:8983
	server solr4 solr4:8983

listen zookeeper-in
	bind *:2181
	balance roundrobin
	server zk1 zk1:2181
	server zk2 zk2:2181
	server zk3 zk3:2181