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# 7.3.33. `log_reopen`

## 7.3.33.1. Summary

`log_reopen` is a command that reloads log files.

It is used to reload log files such as groonga log or query log which are specified by `--log-path` or `--query-log-path` options.

Note

This command only works when the number of worker processes is equal to 1. Thus, it means that if you use groonga-httpd with 2 or more workers, you must use `groonga-httpd -s reopen` instead.

## 7.3.33.2. Syntax

This command takes no parameters:

    log_reopen

## 7.3.33.3. Usage

    log_reopen

    [true]

### 7.3.33.3.1. Rotate log files with log_reopen

1. Rename target log files such as mv command. (Log content is still written into moved log files)

2. Execute `log_reopen` command.

3. New log file is created as same as existing log file name. newer log content is written to new log file.

## 7.3.33.4. Parameters

There is no required parameter.

## 7.3.33.5. Return value

The command returns `true` as body if the command succeeds such as:

    [HEADER, true]

The command returns `false` otherwise such as:

    [HEADER, false]

## 7.3.33.6. See also

log_level log_put