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kvm: fix SharedMountPoint heartbeat when pool path is a subdirectory of a mount - #14331
danivogel90 wants to merge 3 commits into
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…of a mount kvmsmpheartbeat.sh required the pool path itself to be a mount point (mountpoint -q). A SharedMountPoint pool is "a file system path local to each server" and is commonly a subdirectory of a mounted clustered or parallel filesystem (e.g. /data01/vol01 on IBM Storage Scale mounted at /data01). For such pools every heartbeat write failed. - add is_on_mounted_fs(): the path must reside on a mounted filesystem other than / (findmnt -T, fallback df -P). Use it for both the initial check and the /proc/mounts check in front of deleteVMs, so relaxing the first check cannot lead to deleteVMs (kill -9) being run on every write. - check_hbLog: 'expr' exits with 1 when the result is 0, so a heartbeat read in the same second it was written reported the host as DEAD. Validate the timestamp and use shell arithmetic instead. - remove the temporary heartbeat file when the script is interrupted (e.g. killed on timeout). Fixes apache#14326
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The initial check already exits when the path is not on a mounted filesystem, so the deleteVMs branch could not be reached. Remove the branch together with the now unused deleteVMs function. This keeps the behaviour of 4.22.1/4.23: there the earlier 'mountpoint -q' check exited first as well, so deleteVMs never ran in practice. Unlike kvmheartbeat.sh (NFS), which kills VMs only after it remounted a lost NFS share, a SharedMountPoint cannot be remounted by the script. Killing VMs on a failed local check is left to the existing HA/fencing logic.
weizhouapache
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code lgtm
thanks @danivogel90
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@blueorangutan package |
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@weizhouapache a [SL] Jenkins job has been kicked to build packages. It will be bundled with KVM, XenServer and VMware SystemVM templates. I'll keep you posted as I make progress. |
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Copilot review overview
🟡 Changes recommended
Mount-loss safety, forced-timeout cleanup, and numeric timestamp parsing have unresolved correctness issues.
Review effort: Balanced
Findings: 1
Open (3)
What changed in this PR
Fixes KVM HA heartbeats for SharedMountPoint pools located below a filesystem mount.
Changes:
- Resolves the containing filesystem for pool paths.
- Adds temporary heartbeat-file cleanup.
- Validates timestamps and uses shell arithmetic.
| File | Description |
|---|---|
scripts/vm/hypervisor/kvm/kvmsmpheartbeat.sh |
Updates mount validation, heartbeat writes, and timestamp checks. |
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| else | ||
| target=$(df -P "$1" 2>/dev/null | awk 'NR==2 {print $6}') | ||
| fi | ||
| [ -n "$target" ] && [ "$target" != "/" ] |
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Thanks, valid point for an exact pool mount nested below a separate local filesystem. Fixed in d089836:
- If the path is a mount point itself, it is accepted as before (
mountpoint -q). - Otherwise a subdirectory is only accepted if its filesystem is neither
/nor a local disk filesystem (ext*, xfs, btrfs, tmpfs, …).
The script does not receive the expected mount source for SharedMountPoint (-i/-p are unused here), so it cannot compare against it; the filesystem type is the closest signal available.
Tested: pool mounted exactly below a separate local filesystem → accepted; after unmounting the pool → refused, nothing written locally. With acd5ba4 the same case returned 0 and wrote the heartbeat to the local filesystem.
| # remove the temporary file if the script is interrupted (e.g. on timeout) | ||
| trap 'rm -f "$tmpfile"' EXIT | ||
| trap 'exit 1' INT TERM |
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Correct, the trap cannot run after destroyForcibly(). Rather than changing Script.execute() for all scripts, d089836 removes leftover hb-<host>.* temp files older than one minute at the start of the next write. The trap stays for normal exits and TERM.
Tested: a 5-minute-old leftover is removed, a fresh one is kept.
| case "$hb" in | ||
| ''|*[!0-9]*) | ||
| hb_diff=999997 | ||
| return 1 | ||
| ;; | ||
| esac | ||
| diff=$((now - hb)) |
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## 4.22 #14331 +/- ##
============================================
- Coverage 18.02% 18.02% -0.01%
+ Complexity 16250 16246 -4
============================================
Files 5936 5936
Lines 535823 535823
Branches 65612 65612
============================================
- Hits 96582 96568 -14
- Misses 428242 428253 +11
- Partials 10999 11002 +3
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Packaging result [SF]: ✖️ el8 ✖️ el9 ✔️ debian ✖️ suse15. SL-JID 19450 |
Address the review comments on the heartbeat script: - is_on_mounted_fs(): accept the path if it is a mount point itself (as with the former 'mountpoint -q' check). Otherwise accept a subdirectory only if its filesystem is neither / nor a local disk filesystem (ext*, xfs, btrfs, tmpfs, ...). An exact pool mount nested below a separate local filesystem (e.g. /var) that is lost no longer passes: its empty directory belongs to the local parent filesystem, so the heartbeat is not written locally. - write_hbLog: Script.execute() ends a timed out run with destroyForcibly(), so the EXIT/TERM trap cannot remove the temporary file. Remove leftover hb-<host>.* files older than one minute on the next run. - check_hbLog: limit the timestamp to 12 digits and evaluate it as base 10, so a corrupt value with a leading zero (e.g. "08") reports DEAD instead of failing with "value too great for base". Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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@weizhouapache I pushed d089836 to address the Copilot review (exact mount check, temp file cleanup after a forced kill, base-10 parsing). Tested with 17 script cases and live in the agent on one host (Ubuntu 24.04, 4.23.0.0, IBM Storage Scale); details are in the review threads. Could you take another quick look? The packaging run reported failures for el8/el9/suse15 (debian OK). Since the PR only changes a shell script, I assume this is unrelated. Could you re-trigger it? The changes in this PR were prepared with the help of Claude (AI assistant); I reviewed and tested them. Thanks! |
Description
This PR fixes the KVM HA heartbeat for SharedMountPoint pools whose path is a subdirectory of a mounted filesystem, which is common with clustered/parallel filesystems (IBM Storage Scale/GPFS, WEKA, Quobyte, GFS2, OCFS2, CephFS). It also fixes two related problems in
kvmsmpheartbeat.sh(introduced in #12773):mountpoint -q "$MountPoint"rejects valid pools such as/data01/vol01on a GPFS filesystem mounted at/data01. Every heartbeat write fails withMount point is not a mounted filesystem. A new helperis_on_mounted_fs()accepts any path on a mounted filesystem other than/(findmnt -n -o TARGET -T, fallbackdf -P). The safety intent is kept: if the shared filesystem is not mounted, the heartbeat is not written to the local root filesystem.The same helper now also replaces the
/proc/mountscheck in front ofdeleteVMs. Without this, relaxing only the first check would make every heartbeat write calldeleteVMs, whichkill -9s all qemu processes using the pool.check_hbLoguseddiff=`expr $now - $hb`followed byif [ $? -ne 0 ].exprexits with 1 when the result is 0, so a host whose heartbeat was written in the same second as the check was reported as DEAD (999997). The timestamp is now validated and the difference computed with shell arithmetic.hb-<ip>.<pid>temp file remained. Atrapnow removes it.Fixes: #14326
Broader context: #14327
Types of changes
Feature/Enhancement Scale or Bug Severity
Bug Severity
How Has This Been Tested?
Environment: 3 KVM hosts, Ubuntu 24.04, CloudStack 4.23.0.0 (script identical on 4.22 and main), hyperconverged IBM Storage Scale 5.2.3-5 (3-way replication). SharedMountPoint pool
/data01/vol01(subdirectory of GPFS mount/data01), plus an NFS primary storage pool.Script tests (copy of the script with
kill -9replaced by an echo):-t 60-t 1/ corrupt hb fileLive: the patched script has been running in the agent on one host since 2026-10-07. Heartbeat writes succeed, there are no errors in agent.log, and nothing was killed.
HA failover test: HA-enabled VM (offering with
offerha=true) on the SharedMountPoint pool on host A. Agent autostart disabled on A, then A hard-reset via sysrq. Results:How did you try to break this feature and the system with this change?
/varLV) is not detected as "not shared". The previousmountpoint -qcheck did not cover this either.