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Improve setup advice in project README around ENI / IP address limits #276

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Jan 3, 2019
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Improve setup advice in project README around ENI / IP address limits #276

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90d5144
Fix link text to VPC ENI limit code
sftim Dec 21, 2018
0ffce8c
Reword --max-pods and IP address limit advice
sftim Dec 21, 2018
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5 changes: 4 additions & 1 deletion README.md
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Expand Up @@ -18,7 +18,10 @@ Download the latest version of the [yaml](./config/) and apply it the cluster.
kubectl apply -f aws-k8s-cni.yaml
```

Launch kubelet with network plugins set to cni (`--network-plugin=cni`), the cni directories configured (`--cni-config-dir` and `--cni-bin-dir`) and node ip set to the primary IPv4 address of the primary ENI for the instance (`--node-ip=$(curl http://169.254.169.254/latest/meta-data/local-ipv4)`). It is also recommended to set `--max-pods` equal to (the number of ENIs for the instance type * (the number of IPs per ENI - 1)) + 2 [see](./pkg/awsutils/vpc_ip_resource_limit.go) to prevent scheduling that exceeds the IP resources available to the kubelet.
Launch kubelet with network plugins set to cni (`--network-plugin=cni`), the cni directories configured (`--cni-config-dir` and `--cni-bin-dir`) and node ip set to the primary IPv4 address of the primary ENI for the instance (`--node-ip=$(curl http://169.254.169.254/latest/meta-data/local-ipv4)`).
It is also recommended to set `--max-pods` equal to _(the number of ENIs for the instance type × (the number of IPs per ENI - 1)) + 2_; for details, see [vpc_ip_resource_limit.go][]. Setting `--max-pods` will prevent scheduling that exceeds the IP address resources available to the kubelet.

[vpc_ip_resource_limit.go]: ./pkg/awsutils/vpc_ip_resource_limit.go

The default manifest expects `--cni-conf-dir=/etc/cni/net.d` and `--cni-bin-dir=/opt/cni/bin`.

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