Nagios / Icinga plugin to check that mounts are present.
check_mount is a Nagios/Icinga plugin for checking for the presence of mounted filesystems.
Sometimes, it is only important to monitor the presence of a mount, and not the amount of free (or used) storage on that filesystem. For example, when monitoring NFS clients it may be redundant to use check_disk to monitor the NFS mounts because the amount of free storage on those mounts is monitored elsewhere. Additionally, check_disk can give a false negative if the filesystem is not mounted at all, but the directory used as a mount point is present.
usage: check_mount [-h] [-w RANGE] [-c RANGE] [-p PATH] [-t TYPE] [-M PATH] [-v] optional arguments: -h, --help show this help message and exit -w RANGE, --warning RANGE Generate warning state if number of mounts is outside this range -c RANGE, --critical RANGE Generate critical state if number of mounts is outside this range -p PATH, --path PATH A mount point to check to ensure it is present. May be specified more than once. This option is incompatible with --type. -t TYPE, --type TYPE Only check mounts of a particular type. If specified more than once, the count of present mounts will include all mounts of all types specified. This option is incompatible with --path. -M PATH, --mount-path PATH Override the path to mount(8) [Default: /sbin/mount] -v, --verbose Increase output verbosity (use up to 3 times).
If you’re only concerned with making sure the correct number of mounts are present, you can set a warning/critical range.
To warn if anything other than exactly 5 filesystems are mounted:
check_mount -w 5:5
To retun critical if fewer than 5 filesystems are mounted, and a warning if more than 5 are mounted:
check_mount -w :5 -c 5:
Checking Mounts by Type
If you’re only concerned with a particular type of mount, for example you want to ensure that all of your network mounts are present, but ignore any others, you can supply a list of filesystem types to check_mount.
To look only at AFS and NFS mounts, and to expect exactly 2 total mounts (one of each):
check_mount -t NFS -t AFS -w 2:2
By default, check_mount ignores several filessytem pseudo-types. Ignoring these can be overridden by specifying them, along with any other types you would like to check, on the command line. Filesystem types ignored by default are:
autofs bpf cgroup cgroup2 debugfs devpts devtmpfs hugetlbfs mqueue proc pstore securityfs sysfs tmpfs
Checking Specific Mount Points
If you wish to check specific mount points you can specify one or more on the command line with the –path argument:
check_mount -p /home -w1:1
Unlike other modes of operation, when checking specific mount points check_mount applies the warning and critical ranges to each individual mount, rather than the sum of all mounts. This allows check_mount to include the names of specific mounts in its error message. So, if you’re checking three different mount points this way, and you want to return a critical alert if any of them are missing, you would use a command like this:
check_mount -p /home -p /var -p /opt -c1:1
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