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*:

```
calicoctl status
```

* Show the configured network subnet for containers

```
calicoctl get ippool -o wide
```

or for versions prior *v1.0.0*:

```
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*:

```
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

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.
