Sync Gateway Log Rotation

Mobile Sync Gateway
1

For having logging rotation with time Stamp I followed the “https://docs.couchbase.com/sync-gateway/2.1/logging.html” link.
I set log file path as below in my sync function configuration file:
{
…
“logging”: {
“default”: {
“logFilePath”: C:\Program Files\Couchbase\Sync Gateway\var\log\sync_gateway\sglogfile.log,
“logKeys”: ["*"],
“rotation”: {
“maxsize”: 1,
“maxage”: 30,
“maxbackups”: 2,
“localtime”: true
}
}
},

"databases": {

…
}
…
}
it creates 3 different files for error, info and warning. I have 3 questions:
1- first of all, sometimes the logs are not rotated and they all are saved in 1 logfile, for example I set to be rotated if they became 1MB , and the size will increase up to 100MB.
2- If the sizing works, it does not the exact thing I need, I had the second test and I set the maxsize to 1, but it rotates log files in files of 10MB not 1MB.
3- I do not want to have log in default folder: C:\Program Files\Couchbase\Sync Gateway\var\lib\couchbase\logs\sync_gateway_error.txt,
as it fills do much disk space and the OS is installed there, it maks it critical.
this file log does not have rotation, and I can not do anything with it. for example I have a total 50MB of files in logFilePath I specified, but I again have
50MB of log files in default folder.

2

Hey, this style of config is from the older logging functionality pre-2.1.

"logging": {
  "default": ...
}

It sounds like what you may want is the following, which will effectively disable the sync_gateway_error.txt log file (which is referred to as “console” in the config), and keep the sg_error.log, sg_warn.log, sg_info.log inside “log_file_path”, with the following rotation settings:

"logging": {
  "log_file_path": "C:\Program Files\Couchbase\Sync Gateway\var\log\sync_gateway",
  "console": {
    "log_level": "none"
  },
  "error": {
    "rotation": {
      "max_size": 1,
      "max_age": 180
  },
  "warn": {
    "rotation": {
      "max_size": 1,
      "max_age": 90
  },
  "info": {
    "rotation": {
      "max_size": 1,
      "max_age": 3
  }
}
1 Like
3

When I set the following config file, after stopping the time I want to start the service it throws Error :
Error 1067: The process terminated unexpectedly.
Consideration: the OS is Windows, so the address to log files is between : `

{
  "adminInterface": "127.0.0.1:4985",
  "interface": "0.0.0.0:4984",   
  "log": ["HTTP+"],
  "logging": {
  "log_file_path": `C:\Program Files\Couchbase\Sync Gateway\var\log\sync_gateway`,
   "console": {
    "log_level": "none"
  },
    "error": {
        "enabled": true,
        "rotation": {
            "max_size": 10,    // Threshold in megabytes to rotate logs
            "max_age": 360,     // Maximum days to retain log files (Min: 180)
            "localtime": true // Use local computer's time on backup timestamps (false=UTC)
        }
    }
},	
  "databases": {
    "db": {
      "server": "walrus:data",
      "users": {
        "GUEST": {"disabled": false, "admin_channels": ["*"] }
      },
      "allow_conflicts": false,
      "revs_limit": 20
    }
  }

}
4

It looks like the config you posted isn’t valid JSON. You’ll need to double escape the backslashes, and instead wrap in double quotes:

  "log_file_path": "C:\\Program Files\\Couchbase\\Sync Gateway\\var\\log\\sync_gateway",

Also note comments inside JSON aren’t valid:

            "max_size": 10,    // Threshold in megabytes to rotate logs
            "max_age": 360,     // Maximum days to retain log files (Min: 180)
            "localtime": true // Use local computer's time on backup timestamps (false=UTC)

Paste your config into here to validate the JSON formatting: https://jsonlint.com