replica Set mongo docker-compose

Question

I'm trying to configure a mongodb replicaSet using docker-compose, but when I stop the master container it seems that it doesn't pass to the secondary.

redis:  image: redis  ports:   - "6379:6379"  mongo3:  hostname: mongo3  image: mongo  entrypoint: [ "/usr/bin/mongod", "--replSet", "rs", "--journal","--dbpath","/data/db","--smallfiles", "--rest" ]  volumes:   - ./data/mongo3:/data/db  ports:   - "27018:27017"   - "28018:28017"  restart: always  mongo2:  hostname: mongo2  image: mongo  entrypoint: [ "/usr/bin/mongod", "--replSet", "rs", "--journal","--dbpath","/data/db","--smallfiles", "--rest" ]  volumes:   - ./data/mongo2:/data/db  ports:   - "27019:27017"   - "28019:28017"  restart: always  mongo1:  hostname: mongo1  image: mongo  entrypoint: [ "/usr/bin/mongod", "--replSet", "rs", "--journal","--dbpath","/data/db","--smallfiles", "--rest" ]  volumes:   - ./data/mongo1:/data/db ports:   - "27017:27017"   - "28017:28017" links:  - mongo2:mongo2  - mongo3:mongo3 restart: always  web:  build: .  ports:   - "2000:2000"  volumes:   - .:/vip  links:   - redis   - mongo1   - mongo2   - mongo3  nginx:  restart: always  build: ./nginx/  ports:   - "80:80"  links:   - web:web  mongosetup:  image: mongo  links:   - mongo1:mongo1   - mongo2:mongo2   - mongo3:mongo3  volumes:   - ./scripts:/scripts  entrypoint: [ "/scripts/setup.sh" ] 

setup.sh :

#!/bin/bash  MONGODB1=`ping -c 1 mongo1 | head -1  | cut -d "(" -f 2 | cut -d ")" -f 1` MONGODB2=`ping -c 1 mongo2 | head -1  | cut -d "(" -f 2 | cut -d ")" -f 1` MONGODB3=`ping -c 1 mongo3 | head -1  | cut -d "(" -f 2 | cut -d ")" -f 1`  echo "**********************************************" ${MONGODB1} echo "Waiting for startup.." until curl http://${MONGODB1}:28017/serverStatus\?text\=1 2>&1 | grep uptime | head -1; do   printf '.'   sleep 1 done  echo curl http://${MONGODB1}:28017/serverStatus\?text\=1 2>&1 | grep uptime | head -1 echo "Started.."   echo SETUP.sh time now: `date +"%T" ` mongo --host ${MONGODB1}:27017 <<EOF var cfg = {     "_id": "rs",     "version": 1,     "members": [         {             "_id": 0,             "host": "${MONGODB1}:27017",             "priority": 2         },         {             "_id": 1,             "host": "${MONGODB2}:27017",             "priority": 0         },         {             "_id": 2,             "host": "${MONGODB3}:27017",             "priority": 0         }     ],settings: {chainingAllowed: true} }; rs.initiate(cfg, { force: true }); rs.reconfig(cfg, { force: true }); rs.slaveOk(); db.getMongo().setReadPref('nearest'); db.getMongo().setSlaveOk();  EOF 

Answer 1

I had a similar issue and resolved it with the following compose file:

version: "3.8"  services:   mongo1:     image: mongo:4.2     container_name: mongo1     command: ["--replSet", "my-replica-set", "--bind_ip_all", "--port", "30001"]     volumes:       - ./data/mongo-1:/data/db     ports:       - 30001:30001     healthcheck:       test: test $$(echo "rs.initiate({_id:'my-replica-set',members:[{_id:0,host:\"mongo1:30001\"},{_id:1,host:\"mongo2:30002\"},{_id:2,host:\"mongo3:30003\"}]}).ok || rs.status().ok" | mongo --port 30001 --quiet) -eq 1       interval: 10s       start_period: 30s    mongo2:     image: mongo:4.2     container_name: mongo2     command: ["--replSet", "my-replica-set", "--bind_ip_all", "--port", "30002"]     volumes:       - ./data/mongo-2:/data/db     ports:       - 30002:30002    mongo3:     image: mongo:4.2     container_name: mongo3     command: ["--replSet", "my-replica-set", "--bind_ip_all", "--port", "30003"]     volumes:       - ./data/mongo-3:/data/db     ports:       - 30003:30003 

with the following in my /etc/hosts file:

127.0.0.1       mongo1 127.0.0.1       mongo2 127.0.0.1       mongo3 

I documented it in a GitHub repo and with a little blog post here:

https://github.com/UpSync-Dev/docker-compose-mongo-replica-set

https://www.upsync.dev/2021/02/02/run-mongo-replica-set.html