Amazon Web Services
Calico Enterprise provides the following advantages when running in Amazon Web Services (AWS):
- Network Policy for Containers: Calico Enterprise provides fine-grained network security policy for individual containers.
- No Overlays: Within each VPC subnet Calico Enterprise doesn't need an overlay, which means high performance networking for your containers.
- No 50 Node Limit: Calico Enterprise allows you to surpass the 50 node limit, which exists as a consequence of the AWS 50 route limit when using the VPC routing table.
Routing traffic within a single VPC subnet​
Since Calico Enterprise assigns IP addresses outside the range used by AWS for EC2 instances, you must disable AWS src/dst checks on each EC2 instance in your cluster as described in the AWS documentation. This allows Calico Enterprise to route traffic natively within a single VPC subnet without using an overlay or any of the limited VPC routing table entries.
Routing traffic across different VPC subnets / VPCs​
If you need to split your deployment across multiple AZs for high availability then each AZ will have its own VPC subnet. To use Calico Enterprise across multiple different VPC subnets or peered VPCs, in addition to disabling src/dst checks as described above you must also enable IPIP encapsulation and outgoing NAT on your Calico Enterprise IP pools.
See the IP pool configuration reference for information on how to configure Calico Enterprise IP pools.
By default, Calico Enterprise's IPIP encapsulation applies to all container-to-container traffic. However, encapsulation is only required for container traffic that crosses a VPC subnet boundary. For better performance, you can configure Calico Enterprise to perform IPIP encapsulation only across VPC subnet boundaries.
To enable the "CrossSubnet" IPIP feature, configure your Calico Enterprise IP pool resources to enable IPIP and set the mode to "CrossSubnet".
This feature was introduced in Calico Enterprise v2.1, if your deployment was created with an older version of Calico Enterprise, or if you if you are unsure whether your deployment is configured correctly, follow the Configuring IP-in-IP guide which discusses this in more detail.
The following kubectl
command will create or modify an IPv4 pool with
CIDR 192.168.0.0/16 using IPIP mode CrossSubnet
. Adjust the pool CIDR for your deployment.
kubectl apply -f - <<EOF
apiVersion: projectcalico.org/v3
kind: IPPool
metadata:
name: ippool-cs-1
spec:
cidr: 192.168.0.0/16
ipipMode: CrossSubnet
EOF
Enabling workload-to-WAN traffic​
To allow Calico Enterprise networked containers to reach resources outside of AWS, you must configure outgoing NAT on your Calico Enterprise IP pool.
AWS will perform outbound NAT on any traffic which has the source address of an EC2 virtual machine instance. By enabling outgoing NAT on your Calico Enterprise IP pool, Calico Enterprise will NAT any outbound traffic from the containers hosted on the EC2 virtual machine instances.
The following kubectl
command will create or modify an IPv4 pool with
CIDR 192.168.0.0/16 using IPIP mode CrossSubnet
and enables outgoing NAT.
Adjust the pool CIDR for your deployment.
kubectl apply -f - <<EOF
apiVersion: projectcalico.org/v3
kind: IPPool
metadata:
name: ippool-1
spec:
cidr: 192.168.0.0/16
ipipMode: CrossSubnet
natOutgoing: true
EOF
Using AWS networking​
Calico Enterprise supports the AWS VPC CNI plugin, which creates ENI interfaces for the pods that fall within the VPC of the cluster. Routing to these pods is automatically handled by AWS.
We recommend using the AWS VPC CNI plugin with federation as it provides seamless IP connectivity between your AWS cluster and a remote cluster. Ensure that you use version 1.1 or later.
Install the AWS VPC CNI plugin in your Kubernetes cluster as follows.
Download the AWS VPC CNI manifest.
curl \
https://raw.githubusercontent.com/aws/amazon-vpc-cni-k8s/v1.11.4/config/master/aws-k8s-cni.yaml \
-OBy default, the AWS CNI plugin performs SNAT for any packet routed outside the VPC. You must disable SNAT on external packets to allow clusters in other VPCs or connected via VPN to communicate with pods.
cautionRequired for federation.
To disable SNAT on external packets, open the AWS VPC CNI manifest in your favorite editor and add an
AWS_VPC_K8S_CNI_EXTERNALSNAT
environment variable set totrue
in theaws-node
container. An example follows.kind: DaemonSet
apiVersion: apps/v1
# kubernetes versions before 1.9.0 should use extensions/v1beta1
metadata:
name: aws-node
namespace: kube-system
labels:
k8s-app: aws-node
spec:
updateStrategy:
type: RollingUpdate
selector:
matchLabels:
k8s-app: aws-node
template:
metadata:
labels:
k8s-app: aws-node
annotations:
scheduler.alpha.kubernetes.io/critical-pod: ''
spec:
serviceAccountName: aws-node
hostNetwork: true
tolerations:
- operator: Exists
containers:
- image: 602401143452.dkr.ecr.us-west-2.amazonaws.com/amazon-k8s-cni:v1.3.4
imagePullPolicy: Always
ports:
- containerPort: 61678
name: metrics
name: aws-node
env:
- name: AWS_VPC_K8S_CNI_LOGLEVEL
value: DEBUG
- name: MY_NODE_NAME
valueFrom:
fieldRef:
fieldPath: spec.nodeName
- name: AWS_VPC_K8S_CNI_EXTERNALSNAT
value: 'true'noteFor details see the Amazon VPC CNI Plugin Version 1.1 release notes.
Apply the manifest using kubectl.
kubectl apply -f aws-k8s-cni.yaml
Follow the instructions to install Calico Enterprise on AWS.