MongoDB: cannot connect to MongoDB: server selection error: server selection timeout

[harishkumarrajasekaran]

I am getting socket issue in the new version 0.40.0, I was able to resolve the TLS issue by configuring the --web.config file, but the connection to the MongoDB deployment is showing error in Prometheus logs attached below. However, I can perform the connectivity through the same certificates without any issues locally. Any help would be appreciated. Thanks.

Percona prometheus version used: 0.40.0 MongoDB version: 6.0.6 Community Edition

LOG: ######################### level=info ts=2024-01-22T12:14:54.307Z caller=tls_config.go:274 msg="Listening on" address=[::]:9216 level=info ts=2024-01-22T12:14:54.308Z caller=tls_config.go:310 msg="TLS is enabled." http2=false address=[::]:9216

time="2024-01-22T12:14:59Z" level=error msg="Cannot connect to MongoDB: cannot connect to MongoDB: server selection error: server selection timeout, current topology: { Type: Unknown, Servers: [{ Addr: xxx.svc.cluster.local:27017, Type: Unknown, Last error: connection(xxxx..svc.cluster.local:27017[-30]) socket was unexpectedly closed: EOF }, ] }" ##############################

Configurations:

extraArgs:

• --compatible-mode
• --collector.dbstats
• --collector.collstats-limit=0
• --collector.topmetrics
• --web.config=/tmp/webconfig.yaml
• --mongodb.uri=mongodb://user:pass@/admin?tls=true&tlsCertificateKeyFile=/tmp/tls-combined.pem&tlsCAFile=/tmp/ca.crt
• --log.level=debug
• --mongodb.direct-connect=false

web-config:

tls_server_config: cert_file: "/tmp/tls-combined.pem" key_file: "/tmp/tls.key" client_auth_type: "RequireAndVerifyClientCert" client_ca_file: "/tmp/ca.crt" http_server_config: http2: false

Originally posted by @harishkumarrajasekaran in https://github.com/percona/mongodb_exporter/issues/685#issuecomment-1903906999

[l0rdaxel]

I have a similar error, could you show me how you configured your mongodb_exporter.service? I am unable to activate TLS.

Thanks!

[winem]

We ran into the same error with the exporter in version 0.40. Can you please try to run the exporter in version 0.39.0 and see if that works? There is already a PR that addresses the issue with 0.40.0 but unfortunately it's not yet been released. Please see: https://github.com/percona/mongodb_exporter/pull/780

@adnull also provides a container that has the fix already implemented. I'd love to see a new release of this exporter to prevent others from running into this issue, too.

Is there anything that can be done to get a new release? I could not find any timeline or roadmap.

[adnull]

Hi. My docker version contains changes in multiple hosts resolving, i don't think it fixes TLS connection problem, but if it works we can compare what was changed.

[BupycHuk]

Hello @winem, we are going to release 0.41.0 in the middle of june.