Control: 4.3.6 Ensure server parameter 'log_retention_days' is greater than 3 days for PostgreSQL Database Server

Description

It is recommended to enable log_retention_days on PostgreSQL Servers. 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.

Remediation

From Console

Login to Azure console and navigate to PostgreSQL Servers.
For each database, go to Settings section from left pane.
Click on Server parameters.
Search for log_retention_days.
Enter value in range of 4-7 and click save.

From Command Line

Command to update log_retention_days configuration

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

Usage

Run the control in your terminal:

powerpipe control run azure_compliance.control.cis_v140_4_3_6

Snapshot and share results via Turbot Pipes:

powerpipe login
powerpipe control run azure_compliance.control.cis_v140_4_3_6 --share

SQL

This control uses a named query:

select
  s.id as resource,
  case
    when (config -> 'ConfigurationProperties' ->> 'value')::integer <= 3 then 'alarm'
    else 'ok'
  end as status,
  case
    when (config -> 'ConfigurationProperties' ->> 'value')::integer <= 3 then s.name || ' log files are retained for 3 days or lesser.'
    else s.name || ' log files are retained for more than 3 days.'
  end as reason
  
  , s.resource_group as resource_group
  , sub.display_name as subscription
from
  azure_postgresql_server s
  cross join lateral jsonb_array_elements(server_configurations) as config
  left join azure_subscription as sub on sub.subscription_id = s.subscription_id
where
  config ->> 'Name' = 'log_retention_days';