[DOCS-7535] Cloud Manager "Host has low open file limits" page is extremely confusing Created: 30/Mar/16  Updated: 11/Jan/17  Resolved: 27/Jul/16

Status: Closed
Project: Documentation
Component/s: Cloud Manager, Ops Manager
Affects Version/s: None
Fix Version/s: 01112017-cleanup

Type: Bug Priority: Major - P3
Reporter: Kevin Pulo Assignee: Unassigned
Resolution: Won't Fix Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Related
Participants:
Days since reply: 7 years, 46 weeks ago
Epic Link: docs-troubleshooting

 Description   

https://docs.cloud.mongodb.com/troubleshooting/#receive-host-has-low-open-file-limits-or-too-many-open-files-error-messages

These errors are not generated by the mongos instance and, therefore, will not appear in mongos log files.

Why are mongoses singled out when this affects mongods as well?

compares the number of open file descriptors and connections to the maximum connections limit

It does not look at the number of file descriptors, only the number of connections. This is trying (and failing) to say that the "max open fds" ulimit is what determines the "available" connections as reported by the server.

In ping documents

Pings have nothing to do with it, apart from being where a user can find the evidence if they want. This should just talk about serverStatus, since that's where the information comes from.

its serverStatus.connections values, if the sum of the current value plus the available value

Not clear that "current" and "available" are fields inside the "serverStatus.connections" sub-document.

is less than the maxConns configuration value

It's now net.maxIncomingConnections.

To prevent this error, we recommend you set ulimit open files to 64000. We also recommend setting the maxConns command in the mongo shell to at least the recommended settings.

Remove "at least" — having maxConns which is significantly higher than the ulimits is a great way to cause this message.

These are all in addition to the issues pointed out in MMS-2416 and MMS-2541.


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