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Configurable Parameters in Kargo
================================
#### Generic Ansible variables
You can view facts gathered by Ansible automatically
[here](http://docs.ansible.com/ansible/playbooks_variables.html#information-discovered-from-systems-facts).
Some variables of note include:
* *ansible_user*: user to connect to via SSH
* *ansible_default_ipv4.address*: IP address Ansible automatically chooses.
Generated based on the output from the command ``ip -4 route get 8.8.8.8``
#### Common vars that are used in Kargo
* *calico_version* - Specify version of Calico to use
* *calico_cni_version* - Specify version of Calico CNI plugin to use
* *docker_version* - Specify version of Docker to used (should be quoted
string)
* *etcd_version* - Specify version of ETCD to use
* *ipip* - Enables Calico ipip encapsulation by default
* *hyperkube_image_repo* - Specify the Docker repository where Hyperkube
resides
* *hyperkube_image_tag* - Specify the Docker tag where Hyperkube resides
* *kube_network_plugin* - Changes k8s plugin to Calico
* *kube_proxy_mode* - Changes k8s proxy mode to iptables mode
* *kube_version* - Specify a given Kubernetes hyperkube version
* *searchdomains* - Array of DNS domains to search when looking up hostnames
* *nameservers* - Array of nameservers to use for DNS lookup
#### Addressing variables
* *ip* - IP to use for binding services (host var)
* *access_ip* - IP for other hosts to use to connect to. Often required when
deploying from a cloud, such as OpenStack or GCE and you have separate
public/floating and private IPs.
* *ansible_default_ipv4.address* - Not Kargo-specific, but it is used if ip
and access_ip are undefined
* *loadbalancer_apiserver* - If defined, all hosts will connect to this
address instead of localhost for kube-masters and kube-master[0] for
kube-nodes. See more details in the
[HA guide](https://github.com/kubernetes-incubator/kargo/blob/master/docs/ha-mode.md).
* *loadbalancer_apiserver_localhost* - If enabled, all hosts will connect to
the apiserver internally load balanced endpoint. See more details in the
[HA guide](https://github.com/kubernetes-incubator/kargo/blob/master/docs/ha-mode.md).
#### Cluster variables
Kubernetes needs some parameters in order to get deployed. These are the
following default cluster paramters:
* *cluster_name* - Name of cluster (default is cluster.local)
* *domain_name* - Name of cluster DNS domain (default is cluster.local)
* *kube_network_plugin* - Plugin to use for container networking
* *kube_service_addresses* - Subnet for cluster IPs (default is
10.233.0.0/18). Must not overlap with kube_pods_subnet
* *kube_pods_subnet* - Subnet for Pod IPs (default is 10.233.64.0/18). Must not
overlap with kube_service_addresses.
* *kube_network_node_prefix* - Subnet allocated per-node for pod IPs. Remainin
bits in kube_pods_subnet dictates how many kube-nodes can be in cluster.
* *dns_setup* - Enables dnsmasq
* *dns_server* - Cluster IP for dnsmasq (default is 10.233.0.2)
* *skydns_server* - Cluster IP for KubeDNS (default is 10.233.0.3)
* *cloud_provider* - Enable extra Kubelet option if operating inside GCE or
OpenStack (default is unset)
* *kube_hostpath_dynamic_provisioner* - Required for use of PetSets type in
Kubernetes
#### DNS variables
By default, dnsmasq gets set up with 8.8.8.8 as an upstream DNS server and all
other settings from your existing /etc/resolv.conf are lost. Set the following
variables to match your requirements.
* *upstream_dns_servers* - Array of upstream DNS servers configured on host in
addition to Kargo deployed DNS
* *nameservers* - Array of DNS servers configured for use in dnsmasq
* *searchdomains* - Array of up to 4 search domains
* *skip_dnsmasq* - Don't set up dnsmasq (use only KubeDNS)
For more information, see [DNS
Stack](https://github.com/kubernetes-incubator/kargo/blob/master/docs/dns-stack.md).
#### Other service variables
* *docker_options* - Commonly used to set
``--insecure-registry=myregistry.mydomain:5000``
* *http_proxy/https_proxy/no_proxy* - Proxy variables for deploying behind a
proxy
#### User accounts
Kargo sets up two Kubernetes accounts by default: ``root`` and ``kube``. Their
passwords default to changeme. You can set this by changing ``kube_api_pwd``.