docker run -d -p 27017:27017 --name mongodb-primary \
  -e MONGODB_REPLICA_SET_MODE=primary \
  -e MONGODB_ROOT_PASSWORD=123 \
  -e MONGODB_REPLICA_SET_KEY=123456 \
   bitnami/mongodb:latest

docker run -d --name mongodb-secondary \
  --link mongodb-primary:primary \
  -e MONGODB_REPLICA_SET_MODE=secondary \
  -e MONGODB_PRIMARY_HOST=primary \
  -e MONGODB_PRIMARY_PORT_NUMBER=27017 \
  -e MONGODB_PRIMARY_ROOT_PASSWORD=123 \
  -e MONGODB_REPLICA_SET_KEY=123456 \
  bitnami/mongodb:latest

docker run -d --name mongodb-arbiter \
  --link mongodb-primary:primary \
  -e MONGODB_REPLICA_SET_MODE=arbiter \
  -e MONGODB_PRIMARY_HOST=primary \
  -e MONGODB_PRIMARY_PORT_NUMBER=27017 \
  -e MONGODB_PRIMARY_ROOT_PASSWORD=123 \
  -e MONGODB_REPLICA_SET_KEY=123456 \
  bitnami/mongodb:latest