Status = StatusCode.UNAVAILABLE details = "failed to connect to all addresses"

Users Dgraph
, ,
1

hi
The following error occurred while testing pydgraph


Traceback (most recent call last):
  File "/Users/henson/PycharmProjects/personal/temp/dgraph/tls_example.py", line 71, in <module>
    main()
  File "/Users/henson/PycharmProjects/personal/temp/dgraph/tls_example.py", line 32, in main
    client.alter(pydgraph.Operation(drop_all=True))
  File "/usr/local/var/pyenv/versions/py373/lib/python3.7/site-packages/pydgraph/client.py", line 112, in alter
    self._common_except_alter(error)
  File "/usr/local/var/pyenv/versions/py373/lib/python3.7/site-packages/pydgraph/client.py", line 122, in _common_except_alter
    raise error
  File "/usr/local/var/pyenv/versions/py373/lib/python3.7/site-packages/pydgraph/client.py", line 100, in alter
    credentials=credentials)
  File "/usr/local/var/pyenv/versions/py373/lib/python3.7/site-packages/pydgraph/client_stub.py", line 46, in alter
    credentials=credentials)
  File "/usr/local/var/pyenv/versions/py373/lib/python3.7/site-packages/grpc/_channel.py", line 826, in __call__
    return _end_unary_response_blocking(state, call, False, None)
  File "/usr/local/var/pyenv/versions/py373/lib/python3.7/site-packages/grpc/_channel.py", line 729, in _end_unary_response_blocking
    raise _InactiveRpcError(state)
grpc._channel._InactiveRpcError: <_InactiveRpcError of RPC that terminated with:
	status = StatusCode.UNAVAILABLE
	details = "failed to connect to all addresses"
	debug_error_string = "{"created":"@1592552261.602447000","description":"Failed to pick subchannel","file":"src/core/ext/filters/client_channel/client_channel.cc","file_line":3981,"referenced_errors":[{"created":"@1592552261.602444000","description":"failed to connect to all addresses","file":"src/core/ext/filters/client_channel/lb_policy/pick_first/pick_first.cc","file_line":394,"grpc_status":14}]}"
>

The steps are as follows

Start dgraph using Docker-Compose

# This Docker Compose file can be used to quickly bootup Dgraph Zero
# and Alpha in different Docker containers.

# It mounts /tmp/data on the host machine to /dgraph within the
# container. You can change /tmp/data to a more appropriate location.
# Run `docker-compose up` to start Dgraph.

version: "3.2"
services:
  zero:
    image: dgraph/dgraph:latest
    volumes:
      - /tmp/data:/dgraph
      - ./tls:/dgraph/tls
    ports:
      - 5080:5080
      - 6080:6080
    restart: on-failure
    command: dgraph zero --my=zero:5080
  alpha:
    image: dgraph/dgraph:latest
    volumes:
      - /tmp/data:/dgraph
      - ./tls:/dgraph/tls
    ports:
      - 8080:8080
      - 9080:9080
    restart: on-failure
    command: dgraph alpha --my=alpha:7080 --lru_mb=2048 --zero=zero:5080 --tls_dir tls
  ratel:
    image: dgraph/dgraph:latest
    ports:
      - 8000:8000
    command: dgraph-ratel

Generate certificate files

dgraph cert -n live -c dgraphuser

The directory structure is as follows

├── docker-compose.yml
├── example.py
├── tls
│ ├── ca.crt
│ ├── ca.key
│ ├── client.dgraphuser.crt
│ ├── client.dgraphuser.key
│ ├── node.crt
│ └── node.key
└── tls_example.py

tls_example.py

# -*- coding: utf-8 -*-
# @Time    : 2019/11/8 8:51 上午
# @Author  : Henson
# @Email   : henson_wu@foxmail.com
# @File    : api_test.py
import pydgraph
import grpc


def create_client(addr='127.0.0.1:9080'):
    # Read certs
    with open('./tls/ca.crt', 'rb') as f:
        root_ca_cert = f.read()
    with open('./tls/client.dgraphuser.key', 'rb') as f:
        client_cert_key = f.read()
    with open('./tls/client.dgraphuser.crt', 'rb') as f:
        client_cert = f.read()

    # Connect to Dgraph via gRPC with mutual TLS.
    creds = grpc.ssl_channel_credentials(root_certificates=root_ca_cert,
                                         private_key=client_cert_key,
                                         certificate_chain=client_cert)
    client_stub = pydgraph.DgraphClientStub(addr, credentials=creds)
    return pydgraph.DgraphClient(client_stub)


def main():
    client = create_client('127.0.0.1:9080')
    # client.login("groot", "password")

    # Drop all
    client.alter(pydgraph.Operation(drop_all=True))

    # Update schema
    schema = '''
name: string @index(exact) .
description: string .
url: string .
'''
    op = pydgraph.Operation(schema=schema)
    client.alter(op)

    # Mutate
    dgraph = {
        "name": "Dgraph",
        "description": "Scalable, Distributed, Low Latency Graph Database",
        "url": "https://dgraph.io"
    }
    txn = client.txn()
    try:
        txn.mutate(set_obj=dgraph)
        txn.commit()
    finally:
        txn.discard()

    # Query
    res = client.txn(read_only=True).query('''
query dgraph($name: string) {
  data(func: eq(name, $name)) {
    uid
    name
    description
    url
  }
}
''', variables={"$name": "Dgraph"})
    print(res.json)


if __name__ == '__main__':
    main()

An error occurred when executing the “python tls_example.py” command
Did something go wrong?

2

Hi @gumupaier, you are not generating node certificates correctly.

Use the following command to generate certificates.

dgraph cert -n 127.0.0.1 -c dgraphuser
3

me too, do it is no help!