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Shell Programming and Scripting
output redirection
Post 302694303 by CarloM on Thursday 30th of August 2012 10:56:19 AM
08-30-2012
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mongoconnectionexception
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Thrown when the driver fails to connect to the database. There are a number of possible error messages to help you diagnose the connection problem. These are: o No candidate servers found Thrown when the driver cannot establish a connection to MongoDB (fulfilling the ReadPreferences, if specified). o No server name given. This error occurs if you pass in "" as the server name, probably because of an typo with string interpola- tion, e.g., "$servr" instead of "$server". o failed to get host [hostname] or port [portnum] from [server]. This indicated that the server string was malformed. "[hostname]" and "[portnum]" will be as much as the driver could dicipher of it. o Operation in progress Connecting to the database timed out. o Transport endpoint is not connected Generally means that the connection string isn't correct, the driver couldn't even find the database server. o couldn't determine master No server in a replica set connection was identified as the primary. o couldn't get host info for [server] This indicated that DNS could not resolve the server address you gave. This could easily be caused by a typo, for example, "server" instead of "$server". o Invalid Argument This can be caused by attempting to connect to a machine that is up but that the database isn't actually running on. Make sure that you've started the database server before connecting. o Permission denied This means that the socket could not be opened due to permissions issues. On Red Hat variants, this can be caused by a default setting that does not allow Apache to create network connections. You can override this setting by running: $ /usr/sbin/setsebool -P httpd_can_network_connect 1 If the error message is not listed above, it is probably an error from the C socket, and you can search the web for its usual cause. CLASS SYNOPSIS
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