Update 3.3.1 relnotes for schedulejobs/sysctls #3144
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We need to add a note that |
sttts
reviewed
Nov 1, 2016
| security.alpha.kubernetes.io/sysctls: kernel.shm_rmid_forced=1 | ||
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| Sysctls that are namespaced are considered _safe_ and supported. Sysctls that |
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"Sysctls that are namespaced are considered safe and supported." is wrong. Only a small subset of namespaced sysctls are safe to be used in a container environment, namely those which cannot be misused to influence other containers, e.g. by blocking resources like memory outside of the pods' defined memory limits. A rule of thumb: if an exposed sysctl is a security threat in a multi-tenant environment, it is not considered safe.
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For reference, the kube 1.4.0 release note line:
Pods now have alpha support for setting whitelisted, safe sysctls. Unsafe sysctls can be whitelisted on the kubelet.
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Preview:
http://file.rdu.redhat.com/~adellape/102816/331enhancements/release_notes/ocp_3_3_release_notes.html#ocp-3-3-1-3-technology-preview
cc @ncdc @sttts @sdodson @tracyrankin