ConnectionTimeoutException: No suitable servers found while inserting data into mongodb database - mongodb

Question

I am new in Docker and Mongodb.
I have following in my docker-compose.yml file.
version: '3.3'
services:
web:
build:
context: ./
dockerfile: Dockerfile
container_name: php73
volumes:
- ./src:/var/www/html/
ports:
- 8000:80
depends_on:
- db
networks:
- my-network
db:
image: mongo:latest
container_name: mymongo
restart: always
ports:
- '27017-27019:27017-27019'
networks:
- my-network
networks:
my-network:
Following file is run in php container. it just creates a database and insert some collectins into the database.
<?php
require 'vendor/autoload.php';
$myClient = new MongoDB\Client('mongodb://127.0.0.1:27017');
$mydb = $myClient->my_db;
$mycollection = $mydb->my_collection;
$insertData = $mycollection->insertOne([
'doc1' => 'abc',
'doc2' => 'def'
]);
?>
But, it shows following error:
PHP Fatal error: Uncaught MongoDB\\Driver\\Exception\\ConnectionTimeoutException: No suitable servers found (`serverSelectionTryOnce` set): [connection refused calling ismaster on '127.0.0.1:27017'] in /var/www/html/vendor/mongodb/mongodb/src/functions.php:431\nStack trace:\n#0 /var/www/html/vendor/mongodb/mongodb/src/functions.php(431): MongoDB\\Driver\\Manager->selectServer(Object(MongoDB\\Driver\\ReadPreference))\n#1 /var/www/html/vendor/mongodb/mongodb/src/Collection.php(929): MongoDB\\select_server(Object(MongoDB\\Driver\\Manager), Array)\n#2 /var/www/html/mycode.php(16): MongoDB\\Collection->insertOne(Array)\n#3 {main}\n thrown in /var/www/html/vendor/mongodb/mongodb/src/functions.php on line 431, referer: http://localhost:8000/index.php
I could not figure out why it is showing ConnectionTimeoutException.
Could anyone give any hints ?

Answer 1

Update your connection string to
<?php
require 'vendor/autoload.php';
$myClient = new MongoDB\Client('mongodb://db:27017');
// or new MongoDB\Client('mongodb://db:27017');
$mydb = $myClient->my_db;
$mycollection = $mydb->my_collection;
$insertData = $mycollection->insertOne([
'firstname' => 'abc',
'lastname' => 'def'
]);
?>
docker-compose create network by default, you can access other container using container name, where 127.0.0.1 refer to localhost of the php container, not DB container.