Merge pull request #812 from mattymo/vars_doc
Document commonly used Kargo vars
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Antoine Legrand
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docs/vars.md
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Configurable Parameters in Kargo
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================================
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#### Generic Ansible variables
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You can view facts gathered by Ansible automatically
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[here](http://docs.ansible.com/ansible/playbooks_variables.html#information-discovered-from-systems-facts).
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Some variables of note include:
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* *ansible_user*: user to connect to via SSH
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* *ansible_default_ipv4.address*: IP address Ansible automatically chooses.
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Generated based on the output from the command ``ip -4 route get 8.8.8.8``
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#### Common vars that are used in Kargo
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* *calico_version* - Specify version of Calico to use
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* *calico_cni_version* - Specify version of Calico CNI plugin to use
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* *docker_version* - Specify version of Docker to used (should be quoted
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string)
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* *etcd_version* - Specify version of ETCD to use
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* *ipip* - Enables Calico ipip encapsulation by default
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* *hyperkube_image_repo* - Specify the Docker repository where Hyperkube
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resides
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* *hyperkube_image_tag* - Specify the Docker tag where Hyperkube resides
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* *kube_network_plugin* - Changes k8s plugin to Calico
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* *kube_proxy_mode* - Changes k8s proxy mode to iptables mode
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* *kube_version* - Specify a given Kubernetes hyperkube version
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* *searchdomains* - Array of DNS domains to search when looking up hostnames
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* *nameservers* - Array of nameservers to use for DNS lookup
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#### Addressing variables
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* *ip* - IP to use for binding services (host var)
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* *access_ip* - IP for other hosts to use to connect to. Often required when
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deploying from a cloud, such as OpenStack or GCE and you have separate
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public/floating and private IPs.
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* *ansible_default_ipv4.address* - Not Kargo-specific, but it is used if ip
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and access_ip are undefined
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* *loadbalancer_apiserver* - If defined, all hosts will connect to this
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address instead of localhost for kube-masters and kube-master[0] for
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kube-nodes. See more details in the
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[HA guide](https://github.com/kubernetes-incubator/kargo/blob/master/docs/ha-mode.md).
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* *loadbalancer_apiserver_localhost* - If enabled, all hosts will connect to
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the apiserver internally load balanced endpoint. See more details in the
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[HA guide](https://github.com/kubernetes-incubator/kargo/blob/master/docs/ha-mode.md).
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#### Cluster variables
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Kubernetes needs some parameters in order to get deployed. These are the
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following default cluster paramters:
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* *cluster_name* - Name of cluster (default is cluster.local)
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* *domain_name* - Name of cluster DNS domain (default is cluster.local)
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* *kube_network_plugin* - Plugin to use for container networking
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* *kube_service_addresses* - Subnet for cluster IPs (default is
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10.233.0.0/18). Must not overlap with kube_pods_subnet
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* *kube_pods_subnet* - Subnet for Pod IPs (default is 10.233.64.0/18). Must not
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overlap with kube_service_addresses.
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* *kube_network_node_prefix* - Subnet allocated per-node for pod IPs. Remainin
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bits in kube_pods_subnet dictates how many kube-nodes can be in cluster.
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* *dns_setup* - Enables dnsmasq
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* *dns_server* - Cluster IP for dnsmasq (default is 10.233.0.2)
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* *skydns_server* - Cluster IP for KubeDNS (default is 10.233.0.3)
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* *cloud_provider* - Enable extra Kubelet option if operating inside GCE or
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OpenStack (default is unset)
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* *kube_hostpath_dynamic_provisioner* - Required for use of PetSets type in
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Kubernetes
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#### DNS variables
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By default, dnsmasq gets set up with 8.8.8.8 as an upstream DNS server and all
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other settings from your existing /etc/resolv.conf are lost. Set the following
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variables to match your requirements.
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* *upstream_dns_servers* - Array of upstream DNS servers configured on host in
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addition to Kargo deployed DNS
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* *nameservers* - Array of DNS servers configured for use in dnsmasq
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* *searchdomains* - Array of up to 4 search domains
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* *skip_dnsmasq* - Don't set up dnsmasq (use only KubeDNS)
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For more information, see [DNS
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Stack](https://github.com/kubernetes-incubator/kargo/blob/master/docs/dns-stack.md).
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#### Other service variables
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* *docker_options* - Commonly used to set
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``--insecure-registry=myregistry.mydomain:5000``
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* *http_proxy/https_proxy/no_proxy* - Proxy variables for deploying behind a
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proxy
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#### User accounts
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Kargo sets up two Kubernetes accounts by default: ``root`` and ``kube``. Their
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passwords default to changeme. You can set this by changing ``kube_api_pwd``.
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