[snapshot] Add config option for volatile overlayfs#731
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imeoer merged 1 commit intocontainerd:mainfrom Mar 30, 2026
Merged
[snapshot] Add config option for volatile overlayfs#731imeoer merged 1 commit intocontainerd:mainfrom
imeoer merged 1 commit intocontainerd:mainfrom
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Add `enable_overlayfs_volatile` to the snapshot config so operators can globally enable the volatile overlayfs mount option on all writable layers without needing to inject snapshot labels through the container runtime stack. The volatile option skips sync on the upper layer, improving write performance for ephemeral container filesystems. This is a safe trade-off for most workloads where the writable layer does not need to survive a crash.
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Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #731 +/- ##
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+ Coverage 22.02% 24.30% +2.27%
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Files 130 132 +2
Lines 11931 12234 +303
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+ Hits 2628 2973 +345
+ Misses 8960 8897 -63
- Partials 343 364 +21
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Add `enable_overlayfs_volatile` to the snapshot config so operators can globally enable the volatile overlayfs mount option on all writable layers without needing to inject snapshot labels through the container runtime stack. The volatile option skips sync on the upper layer, improving write performance for ephemeral container filesystems. This is a safe trade-off for most workloads where the writable layer does not need to survive a crash.
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…20) Add `enable_overlayfs_volatile` to the snapshot config so operators can globally enable the volatile overlayfs mount option on all writable layers without needing to inject snapshot labels through the container runtime stack. The volatile option skips sync on the upper layer, improving write performance for ephemeral container filesystems. This is a safe trade-off for most workloads where the writable layer does not need to survive a crash.
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Overview
Please briefly describe the changes your pull request makes.
The volatile option skips sync on the upper layer, improving write performance for ephemeral container filesystems. This is a safe trade-off for most workloads where the writable layer does not need to survive a crash.
Related Issues
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Fix #123orRelated #456.Fix #730
Change Details
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Add
enable_overlayfs_volatileto the snapshot config so operators can globally enable the volatile overlayfs mount option on all writable layers without needing to inject snapshot labels through the container runtime stack.Test Results
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Ran a snapshotter locally with the config enabled. Logs show the volatile option being used:
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