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System functions (System Information)

SYSTEM$GET_SERVICE_LOGS

Retrieves local logs from a Snowpark Container Services service container.

See also:

Accessing container logs

Syntax

SYSTEM$GET_SERVICE_LOGS( <service_name>, <instance_id>, <container_name>
   [, <number_of_most_recent_lines> ] [, <retrieve_previous_logs> ])
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Arguments

Required:

service_name

Service name.

instance_id

ID of the service instance, starting with 0.

container_name

Container name as specified in the service specification file.

Optional:

number_of_most_recent_lines

Number of trailing log lines to retrieve.

Default: Up to 100 KB of the most recent log lines.

retrieve_previous_logs

If TRUE, the function retrieves logs from a previously terminated container. You can specify this parameter only if the container has been restarted at least once.

Default: false (retrieve logs from the currently running container).

Returns

Returns a string consisting of newline-separated log entries from the specified service container.

Usage notes

  • The current role must have the MONITOR privilege on the service to access the container logs.

  • The function returns a container log as a string. You can use the SPLIT_TO_TABLE function to convert the string into a table containing one row for each newline-separated entry.

Examples

Retrieving logs from the current container

The following statement retrieves the last 10 log lines from the instance 0 of the “echo_service” service that is running in the “echo” container:

SELECT SYSTEM$GET_SERVICE_LOGS('TUTORIAL_DB.data_schema.echo_service', 0, 'echo', 10);
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You can also follow Tutorial 1: Create a Snowpark Container Services Service to start a service and execute the preceding command to get the service log from a container.

The function returns a string consisting of newline-separated log entries. You can convert this string into a table using the SPLIT_TO_TABLE function and the TABLE() keyword (see Table functions).

SELECT value AS log_line
  FROM TABLE(
    SPLIT_TO_TABLE(SYSTEM$GET_SERVICE_LOGS('echo_service', 0, 'echo'), '\n')
  )
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You can further apply a filter to retrieve only specific log entries. The WHERE clause in the following SELECT statement uses the CONTAINS function to retrieve only the log lines containing a specific date string:

SELECT value AS log_line
  FROM TABLE(
   SPLIT_TO_TABLE(SYSTEM$GET_SERVICE_LOGS('echo_service', '0', 'echo'), '\n')
  )
  WHERE (CONTAINS(log_line, '06/Jun/2023 02:44:'))
  ORDER BY log_line;
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The following sample output shows three log entry rows retrieved:

+-----------------------------------------------------------------------------------------------------+
| LOG_LINE                                                                                            |
|-----------------------------------------------------------------------------------------------------|
| 10.16.9.193 - - [06/Jun/2023 02:44:04] "GET /healthcheck HTTP/1.1" 200 -                            |
| 10.16.9.193 - - [06/Jun/2023 02:44:09] "GET /healthcheck HTTP/1.1" 200 -                            |
| 10.16.9.193 - - [06/Jun/2023 02:44:14] "GET /healthcheck HTTP/1.1" 200 -                            |
+-----------------------------------------------------------------------------------------------------+

Retrieving logs from a previously terminated container

The following statement retrieves the last 10 log lines from the previously terminated instance of the “echo_service” service that is running in the “echo” container. Here we assume the container restarted at least once:

SELECT SYSTEM$GET_SERVICE_LOGS('TUTORIAL_DB.data_schema.echo_service', 0, 'echo', 10, true);
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