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MXS-1775 disk_space_threshold is now also a server parameter

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The disk configuration can be different on different servers.
Hence it should be possible to specify the disk space threshold
separately for each server.
This commit is contained in:
Johan Wikman
2018-05-21 10:29:20 +03:00
parent 2ed631ab63
commit 0a31b7094f
2 changed files with 120 additions and 24 deletions
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43
Documentation/Getting-Started/Configuration-Guide.md
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@ -1269,6 +1269,49 @@ from the configuration.
Removed feature. Only client authenticator modules have options, in the listener
definition. Server authenticator options in the config file are ignored.
#### `disk_space_threshold`
This parameter specifies how full a disk may be, before MaxScale should start
logging warnings or take other actions (e.g. perform a switchover). This
functionality will only work with MariaDB server versions 10.1.32, 10.2.14 and
10.3.6 onwards, if the `DISKS` _information schema plugin_ has been installed.
A limit is specified as a path followed by a colon and a percentage specifying
how full the corresponding disk may be, before action is taken. E.g. an entry like
```
/data:80
```
specifies that the disk that has been mounted on `/data` may be used until 80%
of the total space has been consumed. Multiple entries can be specified by
separating them by a comma. If the path is specified using `*`, then the limit
applies to all disks.
Note that if a particular disk has been mounted on several paths, only one path
need to be specified. If several are specified, then the one with the smallest
percentage will be applied.
Examples:
```
disk_space_threshold=*:80
disk_space_threshold=/data:80
disk_space_threshold=/data1:80,/data2:70,/data3:30
```
Note that the path to be used, is one of the paths returned by:
```
> use information_schema;
> select * from disks;
+-----------+----------------------+-----------+----------+-----------+
| Disk | Path | Total | Used | Available |
+-----------+----------------------+-----------+----------+-----------+
| /dev/sda3 | / | 47929956 | 34332348 | 11139820 |
| /dev/sdb1 | /data | 961301832 | 83764 | 912363644 |
...
```
There is no default value, but this parameter must be explicitly specified
if the disk space situation should be monitored.
### Listener
The listener defines a port and protocol pair that is used to listen for