Cannot connect with Mongo Compass to docerized mongoDB replica sets - mongodb

Question

I have the following docker-compose.yaml file:
version: '3.8'
services:
mongo_launcher:
container_name: mongo_launcher
image: mongo:5.0.8
restart: on-failure
networks:
- mongo_network
volumes:
- ./docker/mongo-setup.sh:/scripts/mongo-setup.sh
entrypoint: ['sh', '/scripts/mongo-setup.sh']
mongo_replica_1:
container_name: mongo_replica_1
image: mongo:5.0.8
ports:
- 27017:27017
restart: always
entrypoint:
[
'/usr/bin/mongod',
'--bind_ip_all',
'--replSet',
'dbrs',
'--dbpath',
'/data/db',
'--port',
'27017',
]
volumes:
- ./.volumes/mongo/replica1:/data/db
- ./.volumes/mongo/replica1/configdb:/data/configdb
networks:
- mongo_network
mongo_replica_2:
container_name: mongo_replica_2
image: mongo:5.0.8
ports:
- 27018:27018
restart: always
entrypoint:
[
'/usr/bin/mongod',
'--bind_ip_all',
'--replSet',
'dbrs',
'--dbpath',
'/data/db',
'--port',
'27018',
]
volumes:
- ./.volumes/mongo/replica2:/data/db
- ./.volumes/mongo/replica2/configdb:/data/configdb
networks:
- mongo_network
mongo_replica_3:
container_name: mongo_replica_3
image: mongo:5.0.8
ports:
- 27019:27019
restart: always
entrypoint:
[
'/usr/bin/mongod',
'--bind_ip_all',
'--replSet',
'dbrs',
'--dbpath',
'/data/db',
'--port',
'27019',
]
volumes:
- ./.volumes/mongo/replica3:/data/db
- ./.volumes/mongo/replica3/configdb:/data/configdb
networks:
- mongo_network
networks:
mongo_network:
driver: bridge
Note that the first service will use the mongo-setup.sh script:
#!/bin/bash
MONGODB_REPLICA_1=mongo_replica_1
MONGODB_REPLICA_2=mongo_replica_2
MONGODB_REPLICA_3=mongo_replica_3
echo "************ [ Waiting for startup ] **************" ${MONGODB_REPLICA_1}
until curl http://${MONGODB_REPLICA_1}:27017/serverStatus\?text\=1 2>&1 | grep uptime | head -1; do
printf '.'
sleep 1
done
echo "************ [ Startup completed ] **************" ${MONGODB_REPLICA_1}
mongosh --host ${MONGODB_REPLICA_1}:27017 <<EOF
var cfg = {
"_id": "dbrs",
"protocolVersion": 1,
"version": 1,
"members": [
{
"_id": 1,
"host": "${MONGODB_REPLICA_1}:27017",
"priority": 3
},
{
"_id": 2,
"host": "${MONGODB_REPLICA_2}:27018",
"priority": 2
},
{
"_id": 3,
"host": "${MONGODB_REPLICA_3}:27019",
"priority": 1
}
],settings: {chainingAllowed: true}
};
rs.initiate(cfg, { force: true });
rs.reconfig(cfg, { force: true });
rs.secondaryOk();
db.getMongo().setReadPref('nearest');
db.getMongo().setSecondaryOk();
EOF
When I run docker-compose up -d, it succeeds and when I run docker ps I get:
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
0c8f6d916e4a mongo:5.0.8 "/usr/bin/mongod --b…" 11 seconds ago Up 10 seconds 27017/tcp, 0.0.0.0:27018->27018/tcp mongo_replica_2
c59cb625362e mongo:5.0.8 "/usr/bin/mongod --b…" 11 seconds ago Up 10 seconds 0.0.0.0:27017->27017/tcp mongo_replica_1
cb61093e4dd0 mongo:5.0.8 "/usr/bin/mongod --b…" 11 seconds ago Up 10 seconds 27017/tcp, 0.0.0.0:27019->27019/tcp mongo_replica_3
But when I try to connect one of the replica sets with Mongo Compass I get the following error:
So it seems as the containers are all running fine, why do I get this issue? Please advice..
I could solve the issue by appending the following content to my /etc/hosts file:
127.0.0.1 mongo_replica_1
127.0.0.1 mongo_replica_2
127.0.0.1 mongo_replica_3
Could anyone come up with more elegant way?
I tried to bypass the /etc/hosts solution, so I edited docker-compose.yaml file and I applied extra_hosts:
version: '3.8'
services:
mongo_launcher:
container_name: mongo_launcher
image: mongo:5.0.8
restart: on-failure
networks:
- mongo_network
volumes:
- ./docker/mongo-setup.sh:/scripts/mongo-setup.sh
entrypoint: ['sh', '/scripts/mongo-setup.sh']
mongo_replica_1:
container_name: mongo_replica_1
image: mongo:5.0.8
ports:
- 27017:27017
extra_hosts:
- 'localhost:0.0.0.0'
restart: always
entrypoint:
[
'/usr/bin/mongod',
'--bind_ip_all',
'--replSet',
'dbrs',
'--dbpath',
'/data/db',
'--port',
'27017',
]
volumes:
- ./.volumes/mongo/replica1:/data/db
- ./.volumes/mongo/replica1/configdb:/data/configdb
networks:
- mongo_network
mongo_replica_2:
container_name: mongo_replica_2
image: mongo:5.0.8
ports:
- 27018:27018
extra_hosts:
- 'localhost:0.0.0.0'
restart: always
entrypoint:
[
'/usr/bin/mongod',
'--bind_ip_all',
'--replSet',
'dbrs',
'--dbpath',
'/data/db',
'--port',
'27018',
]
volumes:
- ./.volumes/mongo/replica2:/data/db
- ./.volumes/mongo/replica2/configdb:/data/configdb
networks:
- mongo_network
mongo_replica_3:
container_name: mongo_replica_3
image: mongo:5.0.8
ports:
- 27019:27019
extra_hosts:
- 'localhost:0.0.0.0'
restart: always
entrypoint:
[
'/usr/bin/mongod',
'--bind_ip_all',
'--replSet',
'dbrs',
'--dbpath',
'/data/db',
'--port',
'27019',
]
volumes:
- ./.volumes/mongo/replica3:/data/db
- ./.volumes/mongo/replica3/configdb:/data/configdb
networks:
- mongo_network
networks:
mongo_network:
driver: bridge
Then I edited the mongo-setup.sh to:
#!/bin/bash
echo "************ [ Waiting for startup ] **************"
until curl http://${MONGODB_REPLICA_1}:27017/serverStatus\?text\=1 2>&1 | grep uptime | head -1; do
printf '.'
sleep 1
done
echo "************ [ Startup completed ] **************"
mongosh --host localhost:27017 <<EOF
var cfg = {
"_id": "dbrs",
"protocolVersion": 1,
"version": 1,
"members": [
{
"_id": 1,
"host": "localhost:27017",
"priority": 3
},
{
"_id": 2,
"host": "localhost:27018",
"priority": 2
},
{
"_id": 3,
"host": "localhost:27019",
"priority": 1
}
],settings: {chainingAllowed: true}
};
rs.initiate(cfg, { force: true });
rs.reconfig(cfg, { force: true });
rs.secondaryOk();
db.getMongo().setReadPref('nearest');
db.getMongo().setSecondaryOk();
EOF
And I removed the edits I made in /etc/hosts file. I don't get an error like before, I do get timeout: