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4.3.6 Ensure Server Parameter 'log_retention_days' is greater than 3 days for PostgreSQL Database Server (Automated)​

Profile Applicability​

• Level 1

Description​

Set log_retention_days on PostgreSQL Servers to an appropriate value.

Rationale​

Enabling log_retention_days helps PostgreSQL Database to Sets number of days a log file is retained which in turn generates query and error logs. Query and error logs can be used to identify, troubleshoot, and repair configuration errors and sub-optimal performance.

Impact​

Enabling this setting will enable logs to be retained for the number entered. If this is enabled for a high traffic server, the log may grow quickly to occupy a large amount of disk space. In this case you may want to set this to a lower number.

Audit​

From Azure Portal​

  1. From Azure Home select the Portal Menu
  2. Go to Azure Database for PostgreSQL server
  3. For each database, click on Server parameters
  4. Search for log_retention_days.
  5. Ensure that value greater than 3.

From Azure CLI​

Ensure log_retention_days value is greater than 3.

az postgres server configuration show --resource-group <resourceGroupName> --server-name <serverName> --name log_retention_days

Remediation​

From Azure Portal​

  1. From Azure Home select the Portal Menu.
  2. Go to Azure Database for PostgreSQL servers.
  3. For each database, click Server parameters.
  4. Search for log_retention_days.
  5. Input a value between 4 and 7 (inclusive) and click Save.

From Azure CLI​

Use the below command to update log_retention_days configuration.

az postgres server configuration set --resource-group <resourceGroupName> --server-name <serverName> --name log_retention_days --value <4-7>

References​

https://docs.microsoft.com/en-us/azure/postgresql/howto-configure-server-parameters-using-portal
https://docs.microsoft.com/en-us/rest/api/postgresql/singleserver/configurations/list-by-server
https://docs.microsoft.com/en-us/security/benchmark/azure/security-controls-v3-logging-threat-detection#lt-6-configure-log-storage-retention

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