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Check free disk space before starting Docker (#2092) #2097

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merged 1 commit into from
Aug 31, 2022
Merged

Check free disk space before starting Docker (#2092) #2097

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1 change: 1 addition & 0 deletions buildroot-external/rootfs-overlay/etc/systemd/system/docker.service.d/failure.conf
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Original file line number Diff line number Diff line change
Expand Up @@ -2,4 +2,5 @@
FailureAction=reboot

[Service]
ExecStartPre=/usr/libexec/docker-disk-check
ExecStopPost=/usr/libexec/docker-failure
12 changes: 12 additions & 0 deletions buildroot-external/rootfs-overlay/usr/libexec/docker-disk-check
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Original file line number Diff line number Diff line change
@@ -0,0 +1,12 @@
#!/bin/sh

# Check if less than 128MiB is available on /mnt/data (4k block size).
if [ "$(stat -f /mnt/data -c '%f')" -lt 32768 ]; then
echo "The system is very low on disk space!"
echo "This can cause Docker to fail to start, causing a boot loop."
echo "Asking systemd-journald to free up some space."
# systemd-journald defaults to 10% of disk size. So this should free up
# space for any system which has been running for a while (presumably it
# has when there is no space) and has a disk size larger than ~2.5GiB.
journalctl --vacuum-size=256M
fi