No suitable servers found (serverselectiontryonce set)

[emotetechnology]

`An uncaught Exception was encountered

Type: MongoDB\Driver\Exception\ConnectionTimeoutException

Message: No suitable servers found (serverselectiontryonce set)

Filename: /var/www/html/application/vendor/mongodb/mongodb/src/Collection.php

Line Number: 438

Backtrace:

File: /var/www/html/application/vendor/mongodb/mongodb/src/Collection.php
Line: 438
Function: selectServer`

[ehoutsma]

Did you enter valid information in the config file?

[emotetechnology]

The config file information seems valid. I have downgraded to php 5.6 and using this library with the same information in config file and it works.

[ehoutsma]

Was there any information behind: " (serverselectiontryonce set)"? There should be a list of the server hosts it tried.

Something like:

Message: No suitable servers found (serverselectiontryonce set): [Failed connecting to 'server1:27017': php_network_getaddresses: getaddrinfo failed: nodename nor servname provided, or not known] [Failed connecting to 'server2:27017': php_network_getaddresses: getaddrinfo failed: nodename nor servname provided, or not known] [Failed connecting to 'server3:27017': Operation timed out]

[ehoutsma]

Ah, I see what the problem is.

The problem is that if you have set the replicateset to a value that's not the name of a replicateset it can't connect:
$config['mongo_db']['default']['replicaSet'] = 'rs0';

Simply remove the line in the config file should do the trick!