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fix: lsblk command add sysroot in container #9

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Merged
hysyeah merged 1 commit into from
Jun 17, 2026
Merged

fix: lsblk command add sysroot in container #9

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8 changes: 8 additions & 0 deletions collector/lsblk_linux.go
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Original file line number Diff line number Diff line change
Expand Up @@ -111,6 +111,14 @@ func (c *lsblkCollector) Update(ch chan<- prometheus.Metric) error {
}

args := []string{"--json", "-b", "-o", "NAME,SIZE,FSTYPE,MOUNTPOINT,FSUSED,FSUSE%"}
// When running inside a container with the host rootfs mounted under
// --path.rootfs (e.g. /host/root), the in-container lsblk cannot see the
// host's device-mapper/LVM topology or filesystem usage. Pointing lsblk at
// the host root via --sysroot makes it read the host's sysfs, udev and
// mountinfo, so LVM volumes and their FSUSED/FSUSE% are reported correctly.
if *rootfsPath != "" && *rootfsPath != "/" {
args = append(args, "--sysroot", *rootfsPath)
}
cmd := execCommand(path, args...)
out, err := CombinedOutputTimeout(cmd, *lsblkTimeout)
if err != nil {
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