libcontainer: improve "kernel.{domainname,hostname}" sysctl handling #1827
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These sysctls are namespaced by CLONE_NEWUTS, and we need to use "kernel.domainname" if we want users to be able to set an NIS domainname on Linux. However we disallow "kernel.hostname" because it would conflict with the "hostname" field and cause confusion (but we include a helpful message to make it clearer to the user). Signed-off-by: Aleksa Sarai <asarai@suse.de>
This was referenced Jun 18, 2018
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This is a part of moby/moby#37302. |
dqminh
reviewed
Jun 19, 2018
| switch s { | ||
| case "kernel.domainname": | ||
| // This is namespaced and there's no explicit OCI field for it. | ||
| continue |
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i dont think we need to explicitly single out kernel.domainname here since its not a TODO for OCI either right ?
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This code is allowing kernel.domainname -- which is why it needs to be singled out (the comment explains why it's allowed and kernel.hostname isn't). If you try to use kernel.domainname without this patch it will fail because runc thinks its not namespaced and fails container creation.
We also can't enable everything under kernel..
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LGTM |
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/cc @opencontainers/runc-maintainers |
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LGTM |
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These sysctls are namespaced by CLONE_NEWUTS, and we need to use
"kernel.domainname" if we want users to be able to set an NIS domainname
on Linux. However we disallow "kernel.hostname" because it would
conflict with the "hostname" field and cause confusion (but we include a
helpful message to make it clearer to the user).
Signed-off-by: Aleksa Sarai asarai@suse.de