Ansible.md

Ansible

The recommended setup is to check out all needed roles as submodules. Have a look at ansible/ for a sample setup. This sample setup has not been tested and should rather give an idea!

Variables

Here important variable lists are presented with their explanation.

Kubernetes-global variables

Each kubernetes cluster has information which has to be shared between so many roles that they were established as convention. They are:

kubernetes_cluster_cidr

CIDR all other IPs except for kubernetes_ha_ip_intern are contained in.

kubernetes_service_cidr

Network for service IPs.

kubernetes_dns_service_ip

Service IP of the DNS service.

kubernetes_api_service_ip

Service IP of the Kubernetes API. Make this the first IP inside kubernetes_service_cidr.

kubernetes_ha_ip_intern

External IP of the Kubernetes API. We are aware of the discrepancy between the variable name stating intern and the external nature. This IP is external to the Kubernetes cluster's service subnet but still intern to the cluster routers.

kubernetes_ha_domain_intern

DNS name leading to kubernetes_ha_ip_intern. Only needs to be resolvable behind the routers.

kubernetes_ha_domain_extern

DNS name globally leading to the Kubernetes API.

kubernetes_cluster_domain

Domain used for DNS names inside the cluster.

kubernetes_autonomous_system_number

BGP AS number of this cluster.

kubernetes_ansible_worker_group

Name of the worker group as defined in the inventory or similar.

kubernetes_ansible_master_group

Name of the master group as defined in the inventory or similar.

kubernetes_ansible_router_group

Name of the router group as defined in the inventory or similar.