Error processing DCP stream

Mobile Sync Gateway
1

Hi I’m running SG 2.7 on localhost and Couchbase CE 6.5 on a remote server (deployed using docker). Below is my config settings:

{
  "log": ["*"],
  "CORS": {
    "Origin": [
      "http://localhost:1234",
      "http://localhost:4200",
      "http://localhost:4300"
    ],
    "LoginOrigin": [
      "http://localhost:1234",
      "http://localhost:4200",
      "http://localhost:4300"
    ],
    "Headers": ["Content-Type", "Authorization"]
  },
  "databases": {
    "fs_db_v0": {
      "server": "http://159.203.117.96:8091/",
      "bucket": "fs-bucket-v0",
      "username": "bucket_user",
      "password": "password",
      "enable_shared_bucket_access": true,
      "import_docs": true,
      "num_index_replicas": 0,
      "sync": "function(doc, oldDoc) {\n  if (doc.replRole) {\n    requireRole('replicator');\n    if (doc.replRole !== 'replicator') {\n      requireRole(doc.replRole);\n      channel(doc.replRole);\n      if (doc.channels && doc.channels.length) {\n        doc.channels.each(function(channel) {\n          channel(doc.replRole + '_' + channel);\n        });\n      }\n    }\n  } else {\n    requireRole('sync_daemon');\n    channel(doc.channels);\n  }\n}",
      "users": {
        "test": {
          "password": "password",
          "admin_channels": ["repayments_2404_260_159"]
        },
        "sync_daemon_user": {
          "password": "password",
          "admin_roles": ["sync_daemon"],
          "admin_channels": ["*"]
        }
      }
    }
  }
}

I am however getting the following warning in the SG Logs

2020-05-20T13:18:56.745+02:00 [WRN] Error processing DCP stream - will attempt to restart/reconnect if appropriate: worker connect, server: 172.17.0.2:11210, err: dial tcp 172.17.0.2:11210: connect: operation timed out. -- base.(*DCPReceiver).OnError() at dcp_feed.go:134

I believe this is preventing changes made by the SDK to be propagated into Sync Gateway and I cannot see and documents via the /_all_docs endpoint or even the /_changes endpoint.

I need helping with networking Sync Gateway to the correct tcp service in the docker container running Couchbase Server.

2

Any reason your sync gateway and couchbase server are not co-located in same data center. And any reason you want your database server directly exposed over public network ?

In general, when you use docker you would deploy Sync Gateway and Couchbase Server continuers on same docker network. Otherwise you need to figure out a way to expose the service to clients outside your container and in your case, outside of localhost …

You can consider have a reverse proxy or load balancer in front of the server that Sync Gateway can then connect to…

3

Let me try to deploy Sync Gateway and Couchbase Server in the same docker network.

We use a Managed Couchbase Server for the whole organization, so it might not be possible to deploy Sync Gateway on that Server for every application we will need a SG for.

How would you advise I deploy the Couchbase Server other that making it publicly available over a network? To use a VPN? Should I not expose its port outside the docker network? If I do this, will it be possible for me to still login the Admin Portal?

Regards

4

Refer to this blog as a staring point. It’s for a dev localhost environment but you could translate it to a cloud environment. That said, I would recommend that you discuss the security implications with your network infrastructure /security team.

Also, have you considered using a container orchestration engine like kubernetes for managing all of this ? That would probably be the preferred approach instead of manually setting up docker networks etc