c12s-kubespray/docs/calico.md

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Calico
===========
Check if the calico-node container is running
```
docker ps | grep calico
```
The **calicoctl** command allows to check the status of the network workloads.
* Check the status of Calico nodes
```
calicoctl node status
```
or for versions prior *v1.0.0*:
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```
calicoctl status
```
* Show the configured network subnet for containers
```
calicoctl get ippool -o wide
```
or for versions prior *v1.0.0*:
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```
calicoctl pool show
```
* Show the workloads (ip addresses of containers and their located)
```
calicoctl get workloadEndpoint -o wide
```
and
```
calicoctl get hostEndpoint -o wide
```
or for versions prior *v1.0.0*:
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```
calicoctl endpoint show --detail
```
##### Optional : Define network backend
In some cases you may want to define Calico network backend. Allowed values are 'bird', 'gobgp' or 'none'. Bird is a default value.
To re-define you need to edit the inventory and add a group variable `calico_network_backend`
```
calico_network_backend: none
```
##### Optional : BGP Peering with border routers
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In some cases you may want to route the pods subnet and so NAT is not needed on the nodes.
For instance if you have a cluster spread on different locations and you want your pods to talk each other no matter where they are located.
The following variables need to be set:
`peer_with_router` to enable the peering with the datacenter's border router (default value: false).
you'll need to edit the inventory and add a and a hostvar `local_as` by node.
```
node1 ansible_ssh_host=95.54.0.12 local_as=xxxxxx
```
##### Optional : Define global AS number
Optional parameter `global_as_num` defines Calico global AS number (`/calico/bgp/v1/global/as_num` etcd key).
It defaults to "64512".
##### Optional : BGP Peering with route reflectors
At large scale you may want to disable full node-to-node mesh in order to
optimize your BGP topology and improve `calico-node` containers' start times.
To do so you can deploy BGP route reflectors and peer `calico-node` with them as
recommended here:
* https://hub.docker.com/r/calico/routereflector/
* http://docs.projectcalico.org/v2.0/reference/private-cloud/l3-interconnect-fabric
You need to edit your inventory and add:
* `calico-rr` group with nodes in it. At the moment it's incompatible with
`kube-node` due to BGP port conflict with `calico-node` container. So you
should not have nodes in both `calico-rr` and `kube-node` groups.
* `cluster_id` by route reflector node/group (see details
[here](https://hub.docker.com/r/calico/routereflector/))
Here's an example of Kargo inventory with route reflectors:
```
[all]
rr0 ansible_ssh_host=10.210.1.10 ip=10.210.1.10
rr1 ansible_ssh_host=10.210.1.11 ip=10.210.1.11
node2 ansible_ssh_host=10.210.1.12 ip=10.210.1.12
node3 ansible_ssh_host=10.210.1.13 ip=10.210.1.13
node4 ansible_ssh_host=10.210.1.14 ip=10.210.1.14
node5 ansible_ssh_host=10.210.1.15 ip=10.210.1.15
[kube-master]
node2
node3
[etcd]
node2
node3
node4
[kube-node]
node2
node3
node4
node5
[k8s-cluster:children]
kube-node
kube-master
[calico-rr]
rr0
rr1
[rack0]
rr0
rr1
node2
node3
node4
node5
[rack0:vars]
cluster_id="1.0.0.1"
```
The inventory above will deploy the following topology assuming that calico's
`global_as_num` is set to `65400`:
![Image](figures/kargo-calico-rr.png?raw=true)
Cloud providers configuration
=============================
Please refer to the official documentation, for example [GCE configuration](http://docs.projectcalico.org/v1.5/getting-started/docker/installation/gce) requires a security rule for calico ip-ip tunnels. Note, calico is always configured with ``ipip: true`` if the cloud provider was defined.