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SG Collect Info

sgcollect_info is command line utility that provides detailed statistics for a specific Sync Gateway node. This tool must be run on each node individually, not on all simultaneously.

sgcollect_info outputs the following statistics in a zip file:

  1. Logs

  2. Configuration

  3. Expvars (exported variables) that contain important stats

  4. System Level OS stats

  5. Golang profile output (runtime memory and cpu profiling info)

CLI command and parameters

To see the CLI command line parameters, run:

./sgcollect_info --help


Collect Sync Gateway diagnostics and save locally:

./sgcollect_info /tmp/sgcollect_info.zip

Collect Sync Gateway diagnostics and upload them to the Couchbase Support AWS S3 bucket:

./sgcollect_info \
  --sync-gateway-config=/path/to/config.json \
  --sync-gateway-executable=/usr/bin/sync_gateway \
  --upload-host=s3.amazonaws.com/cb-customers \
  --customer=Acme \

REST Endpoint

sgcollect_info can now be run from the Admin REST API as of Sync Gateway 2.1 using the _sgcollect_info endpoint.

Zipfile contents

The tool creates the following log files in the ouput file.

Log file Description


The http access log for sync gateway (i.e which GETs and PUTs it has received and from which IPs)


The http access log for sg_accel (i.e which GETs and PUTs it has received and from which IPs)


The error log (all logging sent to stderr by sg_accel) for the sg_accel process


The error log (all logging sent to stderr by sync_gateway) for the sync_gateway process


The output of http://localhost:4895 for the running sync gateway


The output of http://localhost:4895/db_name for the running sync gateway


The on-disk configuration file used by sync_gateway when it was launched


The on-disk configuration file used by sg_accel when it was launched


The configuration used by sync gateway as it is running (may not match the on-disk config as it can be changed on-the-fly)


The config used by sync gateway for the database specified by db_name


The expvars (global exposed variables - see https://www.mikeperham.com/2014/12/17/expvar-metrics-for-golang/ for the running sync gateway instance)


The command line arguments passed to sgcollect_info for this particular output


OS-level System Stats


Exported Variables (expvars) from Sync Gateway which show runtime stats


Goroutine pprof profile output


Heap pprof profile output


CPU profile pprof profile output


System level logs like /var/log/dmesg on Linux


The Sync Gateway binary executable


The pprof output that collects directly via an http client rather than using go tool, in case Go is not installed

File concatenation

SGCollect Info has been updated to use the continuous logging feature introduced in 2.1, and collects the four leveled files (sg_error.log, sg_warn.log, sg_info.log and sg_debug.log).

These new log files are rotated and compressed by Sync Gateway, so sgcollect_info decompresses these rotated logs, and concatenates them back into a single file upon collection.

For example, if you have sg_debug.log, and sg_debug-2018-04-23T16-57-13.218.log.gz and then run sgcollect_info as normal, both of these files get put into a sg_debug.log file inside the zip output folder.

Log Redaction

SGCollect Info now supports log redaction post-processing. In order to utilize this, Sync Gateway needs to be run with the logging.redaction_level property set to "partial".

Two new command line options have been added to sgcollect_info:

  • --log-redaction-level=REDACT_LEVEL: redaction level for the logs collected, none and partial supported. Defaults to none.

    When --log-redaction-level is set to partial, two zip files are produced, and tagged contents in the redacted one should be hashed in the same way as cbcollect_info:

    $ ./sgcollect_info --log-redaction-level=partial sgout.zip
    Zipfile built: sgout-redacted.zip
    Zipfile built: sgout.zip
  • --log-redaction-salt=SALT_VALUE: salt used in the hashing of tagged data when enabling redaction. Defaults to a random uuid.