kubespray/roles/network_plugin/calico/templates/network-environment.j2

# This host's IPv4 address (the source IP address used to reach other nodes
# in the Kubernetes cluster).
DEFAULT_IPV4={{ip | default(ansible_default_ipv4.address) }}

# The Kubernetes master IP
KUBERNETES_MASTER={{ kube_apiserver_endpoint }}

# IP and port of etcd instance used by Calico
ETCD_ENDPOINTS={{ etcd_access_endpoint }}
ETCD_CA_CERT_FILE=/etc/calico/certs/ca_cert.crt
ETCD_CERT_FILE=/etc/calico/certs/cert.crt
ETCD_KEY_FILE=/etc/calico/certs/key.pem