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Increase nf_conntrack settings on frontend nodes

Steve Starkerequested to merge
sstrk/issue-837 into devel

Version Control Information

Source branch: sstrk/issue-837 Target branch: devel

Commits: 

* Increase nf_conntrack settings on frontend nodes

As we observed that the default values are not sufficient, i.e. if
ch-k8s-lbaas is enabled and SNAT'ing on the gateways is disabled.
If the conntrack table is filled up, keepalived may gets prevented from
sending its VRRP packets which can cause cascading failovers.

The settings are done on frontend nodes in general and are not limited
to setups with gateways as it makes sense to increase these setting in
general on nodes running the frontend services.

Closes: #837

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