Disks can be monitored with check-disk from the official check plugin pack. For more on how to install the official check plugin pack, refer to Using the official check plugin pack for check monitoring.
Using check-disk
To monitor disks using check-disk, write a command similar to the following example into the mackerel-agent.conf and restart mackerel-agent.
In the following example, Warning occurs when the /tmp disk capacity is 10% or less, and Critical when the disk capacity is 5% or less.
[plugin.checks.disk] command = ["check-disk", "--path", "/tmp", "--warning", "10%", "--critical", "5%"]
For Windows Server environments, use the following example (Warning occurs when the C drive disk capacity is 10% or less, and Critical when the disk capacity is 5% or less).
[plugin.checks.disk] command = ["check-disk", "--path", "C:", "--warning", "10%", "--critical", "5%"]
The options --warning and --critical can be specified by disk capacity instead of "%". Additionally, multiple --path options can be specified, in which case they are treated as OR conditions.
In the following example, the two partitions "/tmp" and "/var" are checked and if the capacity of either partition falls below 10 GB, Warning will occur. If the capacity falls below 5 GB, Critical will occur.
[plugin.checks.disk] command = ["check-disk", "--path", "/tmp", "--path", "/var", "--warning", "10", "--critical", "5", "--units", "GB"]
Specifying thresholds
With check-disk, thresholds can be configured to generate alerts for the monitoring target disk using options like the following.
-w,--warning- If the available disk space or the disk ratio is less than the configured value, a Warning alert occurs
-c,--critical- If the available disk space or the disk ratio is less than the configured value, a Critical alert occurs
-W,--iwarning- If the inode ratio is less than the configured value, a Warning alert occurs (for Linux OS only)
-K,--icritical- If the inode ratio is less than the configured value, a Critical alert occurs (for Linux OS only)
Specifying partitions
By default, check-disk monitors all devices, but you can also specify the file system type and the device mount point to be monitored.
-p,--path- Monitor the specified device (multiple specifications possible)
-x,--exclude-device- Exclude the specified device from the monitoring targets
-X,--exclude-type- Exclude devices of the specified file system type from the monitoring targets (multiple specifications possible)
-N,--include-type- Monitor devices of the specified file system type only (multiple specifications possible)
In the following example, all devices excluding “/tmp” type are monitored.
[plugin.checks.disk] command = ["check-disk", "--include-type", "none", "--exclude-device", "/tmp", "--warning", "10%", "--critical", "5%"]
For other options check out check-disk --help and README.
Source code
The check-disk source code is publicly available here:
https://github.com/mackerelio/go-check-plugins/tree/master/check-disk
