SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed: Name or service not known

I am working in a Laravel project. My .env file is like below

APP_NAME=
APP_KEY=base64:8A6EtfcKlr98ocYl69PC27UmTzNtcfoldJaZMXxWeHM
APP_DEBUG=true
LOG_CHANNEL=daily


BROADCAST_DRIVER=redis
CACHE_DRIVER=file
QUEUE_CONNECTION=database
SESSION_LIFETIME=1200000

REDIS_HOST=127.0.0.1
REDIS_PASSWORD=null
REDIS_PORT=6379



PUSHER_APP_ID=
PUSHER_APP_KEY=
PUSHER_APP_SECRET=
PUSHER_APP_CLUSTER=

MIX_PUSHER_APP_KEY=""
MIX_PUSHER_APP_CLUSTER=""


MIX_PUSHER_APP_KEY="${PUSHER_APP_KEY}"
MIX_PUSHER_APP_CLUSTER="${PUSHER_APP_CLUSTER}"

Code of config/database.php file is like below

'connections' => [

        'sqlite' => [
            'driver' => 'sqlite',
            'database' => env('DB_DATABASE', database_path('database.sqlite')),
            'prefix' => '',
        ],


     'mysql' => [
            'driver' => 'mysql',
            'host' => env('DB_HOST', '127.0. 0.1'),
            'port' => env('DB_PORT', '3306'),
            'database' => env('DB_DATABASE', 'eduerp'),
            'username' => env('DB_USERNAME', 'root'),
            'password' => env('DB_PASSWORD', 'root'),
            'unix_socket' => env('DB_SOCKET', ''),
            'charset' => 'utf8mb4',
            'collation' => 'utf8mb4_unicode_ci',
            'prefix' => '',
            'strict' => false,
            'engine' => null,
        ],
       

        'pgsql' => [
            'driver' => 'pgsql',
            'host' => env('DB_HOST', '127.0.0.1'),
            'port' => env('DB_PORT', '5432'),
            'database' => env('DB_DATABASE', 'forge'),
            'username' => env('DB_USERNAME', 'forge'),
            'password' => env('DB_PASSWORD', ''),
            'charset' => 'utf8',
            'prefix' => '',
            'schema' => 'public',
            'sslmode' => 'prefer',
        ],

        'sqlsrv' => [
            'driver' => 'sqlsrv',
            'host' => env('DB_HOST', 'localhost'),
            'port' => env('DB_PORT', '1433'),
            'database' => env('DB_DATABASE', 'forge'),
            'username' => env('DB_USERNAME', 'forge'),
            'password' => env('DB_PASSWORD', ''),
            'charset' => 'utf8',
            'prefix' => '',
        ],

    ],

I am getting SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed: Name or service not known error.