log_file_mode

doc html

<p>
        On Unix systems this parameter sets the permissions for log files
        when <code class="varname">logging_collector</code> is enabled. (On Microsoft
        Windows this parameter is ignored.)
        The parameter value is expected to be a numeric mode
        specified in the format accepted by the
        <code class="function">chmod</code> and <code class="function">umask</code>
        system calls.  (To use the customary octal format the number
        must start with a <code class="literal">0</code> (zero).)
       </p><p>
        The default permissions are <code class="literal">0600</code>, meaning only the
        server owner can read or write the log files.  The other commonly
        useful setting is <code class="literal">0640</code>, allowing members of the owner's
        group to read the files.  Note however that to make use of such a
        setting, you'll need to alter <a class="xref" href="/docs/18/runtime-config-logging.html#GUC-LOG-DIRECTORY">log_directory</a> to
        store the files somewhere outside the cluster data directory.  In
        any case, it's unwise to make the log files world-readable, since
        they might contain sensitive data.
       </p><p>
        This parameter can only be set in the <code class="filename">postgresql.conf</code>
        file or on the server command line.
       </p>

documentation revision

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