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Add a note on availability of tcp_syncookies syctl (#7627)

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* Add a note on availability of tcp_syncookies syctl

Sysctl `net.ipv4.tcp_syncookies` is not availalbe on 4.4 kernel
as it's not namespaced yet.

* updating to use {: .note} notation 

per https://kubernetes.io/docs/home/contribute/style-guide/#note
This commit is contained in:
Tomoe Sugihara
2018-03-05 05:26:52 +09:00
committed by k8s-ci-robot
parent 313f89c2d9
commit bc1b890f74
1 changed files with 3 additions and 0 deletions
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docs/concepts/cluster-administration/sysctl-cluster.md
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@@ -70,6 +70,9 @@ For Kubernetes 1.4, the following sysctls are supported in the _safe_ set:
- `net.ipv4.ip_local_port_range`, - `net.ipv4.ip_local_port_range`,
- `net.ipv4.tcp_syncookies`. - `net.ipv4.tcp_syncookies`.
**Note**: The example `net.ipv4.tcp_syncookies` is not namespaced on Linux kernel version 4.4 or lower.
{: .note}
This list will be extended in future Kubernetes versions when the kubelet This list will be extended in future Kubernetes versions when the kubelet
supports better isolation mechanisms. supports better isolation mechanisms.