Mongo-Connector无法连接MongoDB副本集至Elasticsearch求助

Let's break down why you're hitting this error and how to fix it:

The Root Cause #

When you connect to a MongoDB replica set, the primary node returns the full list of replica set members (from your replica.js config: mongo-rs0-1:27017, mongo-rs0-2:27017, mongo-rs0-3:27017) to the client (mongo-connector). Your OS X host doesn't know how to resolve these container names to IP addresses, so it throws the nodename nor servname provided error.

Solution 1: Update Your Hosts File (For Running mongo-connector on Host) #

This lets your local machine map the container names to their internal Docker IPs:

1. Get the IP addresses of your MongoDB containers
   Run these commands in your terminal to fetch each container's IP:

   docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' mongo-rs0-1
   docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' mongo-rs0-2
   docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' mongo-rs0-3
   

   Note down each IP (e.g., 172.18.0.2, 172.18.0.3, 172.18.0.4).

2. Edit your /etc/hosts file
   Open the file with sudo privileges:

   sudo nano /etc/hosts
   

   Add these lines at the bottom (replace the IPs with your actual container IPs):

   # MongoDB Replica Set Container Mapping
   172.18.0.2 mongo-rs0-1
   172.18.0.3 mongo-rs0-2
   172.18.0.4 mongo-rs0-3
   

   Save and exit (press Ctrl+O, hit Enter, then Ctrl+X).

3. Re-run your mongo-connector command
   The container names will now resolve correctly, and the connection should work.

Solution 2: Run mongo-connector in Docker (Recommended, More Stable) #

Since Docker Compose creates an internal network where containers can resolve each other by name, adding mongo-connector as a service to your docker-compose.yml avoids needing to edit hosts files entirely:

1. Update your docker-compose.yml
   Add this new service block (adjust the Elasticsearch target based on where it's running):

   version: '3'
   services:
     # Keep all your existing services (mongo-rs0-1, mongo-rs0-2, etc.)
     mongo-connector:
       image: mongo-connector:latest
       # If Elasticsearch is running on your host, use host.docker.internal (OS X Docker's alias for the host)
       # If Elasticsearch is another Docker container, replace with its service name
       command: mongo-connector -m mongo-rs0-1:27017 -t host.docker.internal:9200 -d elastic2_doc_manager
       depends_on:
         - mongo-rs0-1
         - setup-rs
       extra_hosts:
         - "host.docker.internal:host-gateway"
   

2. Start the new service
   Run this command to spin up the mongo-connector container:

   docker-compose up -d mongo-connector
   

Quick Compatibility Check #

Make sure your mongo-connector version supports MongoDB 3.6.4. Older versions might have compatibility issues with older MongoDB releases, so double-check the version if you run into additional errors.

内容的提问来源于stack exchange，提问作者Colin Richardson