Client has not connected to the Neo4j server

[Shyshkovskyi]

Hi there, I'm using .Net 6.0 and  Neo4j client 5.1.3

I've been trying to run my app in Docker. All containers are created, but when I try to send a request, my application returns the error: 

Neo4j.Driver.ServiceUnavailableException: Connection with the server breaks due to ExtendedSocketException: Name or service not known Please ensure that your database is listening on the correct host and port and that you have compatible encryption settings both on Neo4j server and driver. Note that the default encryption setting has changed in Neo4j 4.0.

Please, take a look at these configuration files. If someone knows where the issue is, please lemme know because, to tell the truth, I have no idea what is wrong here. I appreciate any help you can provide.

appsettings.json

{
  "Neo4jConfiguration": {
    "Uri": "bolt://neo4j:7687",
    "DatabaseName": "neo4j",
    "Login": "neo4j",
    "Password": "6C2coi7kwnyYb7hNmfyvYNkyhxB!"
  },
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Information"
    }
  },
  "AllowedHosts": "*"
}

docker-compose.yml

version: '3.4'

services:
  server:
    image: "webapi-image"
    network_mode: "bridge"
    ports:
      - "8080:80"
    build:
      context: .
      dockerfile: Dockerfile
    stdin_open: true
    tty: true
    environment:
      - CHOKIDAR_USEPOLLING=true
      - NEO4JCONFIGURATION__URI=bolt://neo4j:7687
      - NEO4JCONFIGURATION__PASSWORD=6C2coi7kwnyYb7hNmfyvYNkyhxB!
    depends_on:
      - neo4j
  neo4j:
    image: "neo4j:latest"
    network_mode: "bridge"
    ports:
      - "7687:7687"
      - "7474:7474"
    volumes:
      - ./neo4j/data:/data
      - ./neo4j/logs:/logs
      - ./neo4j/import:/var/lib/neo4j/import
      - ./neo4j/plugins:/plugins
    environment:
      - NEO4J_AUTH=neo4j/6C2coi7kwnyYb7hNmfyvYNkyhxB!

[glilienfield]

What does 'neo4j' resolve to in your uri?

[glilienfield]

nevermind...I see 'neo4j' refers to the neo4j service on the default docker network.  I am not deeply knowledgable on docker, but I got my spring boot application running in a docker container to access neo4j running in/out of a docker container, but running locally, with the following uri. It is equivalent of localhost:7687, but the host's localhost, not the container's. 

bolt://host.docker.internal:7687

[glilienfield]

BTW- I am using a Mac. According the following article, this works on Mac and windows.  An additional config is required for linux.

https://medium.com/@TimvanBaarsen/how-to-connect-to-the-docker-host-from-inside-a-docker-container-1...

[Shyshkovskyi]

I've just tried this one)

Neo4j.Driver.ServiceUnavailableException: Connection with the server breaks due to ExtendedSocketException: Name or service not known Please ensure that your database is listening on the correct host and port and that you have compatible encryption settings both on Neo4j server and driver. Note that the default encryption setting has changed in Neo4j 4.0.

[Shyshkovskyi]

The name of the container where neo4j is running.

[glilienfield]

Here is my docker compose.yml file:

services:
  neo4j-db:
    image: neo4j:4.4.11-enterprise
    ports:
      - 7474:7474
      - 7687:7687
    environment:
      - NEO4J_AUTH=neo4j/test
      - NEO4J_ACCEPT_LICENSE_AGREEMENT=yes
    volumes:
      - $HOME/neo4j/data:/data
      - $HOME/neo4j/logs:/logs
      - $HOME/neo4j/plugins:/plugins
      - $HOME/neo4j/import:/import
    healthcheck:
      test: "exit 0"
  item-service:
    image: item-service:latest
    environment:
      - spring.neo4j.uri=bolt://host.docker.internal:7687
      - command.line.runner.enabled=true
    ports:
        - 8080:8080
    depends_on:
        neo4j-db:
          condition: service_healthy

[Shyshkovskyi]

@glilienfield Anyway, I'm getting the same error 💩

[Shyshkovskyi]

I've already found the issues, to tell the truth there were several issues 🙂 Now it works, maybe it'll be useful for someone who struggle with it as well.

1. We didn't await when connect to the client and in this case we lost main exception
2. Docker compose had wrong configuration
3. When I run docker compose the app starts before the neo4j and of course we couldn't create a client because neo4j wasn't ready

```
version: '3.4'

services:
server:
image: "webapi-image"
ports:
- "8080:80"
build:
context: .
dockerfile: Dockerfile
environment:
- NEO4JCONFIGURATION__URI=bolt://neo4j:7687
- NEO4JCONFIGURATION__USERNAME=neo4j
- NEO4JCONFIGURATION__PASSWORD=6C2coi7kwnyYb7hNmfyvYNkyhxB!
depends_on:
neo4j:
condition: service_healthy
neo4j:
image: "neo4j:3.5"
ports:
- "7687:7687"
- "7474:7474"
volumes:
- ./neo4j/data:/data
- ./neo4j/logs:/logs
- ./neo4j/import:/var/lib/neo4j/import
- ./neo4j/plugins:/plugins
environment:
- NEO4J_AUTH=neo4j/6C2coi7kwnyYb7hNmfyvYNkyhxB!
healthcheck:
test: wget http://localhost:7474 || exit 1
interval: 1s
timeout: 10s
retries: 10
start_period: 3s
```