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client: do not disable memory swappiness if kernel does not support it
This PR adds a workaround for very old Linux kernels which do not support the memory swappiness interface file. Normally we write a "0" to the file to explicitly disable swap. In the case the kernel does not support it, give libcontainer a nil value so it does not write anything. Fixes #17448
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,3 @@ | ||
```release-note:bug | ||
client: Fixed a bug where Nomad incorrectly write to memory swappiness cgroup on old kernels | ||
``` |
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@shoenig I see the sys path file is present and can be stat'd, but it cannot be written to: