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Configurable Parameters in Kargo

Generic Ansible variables

You can view facts gathered by Ansible automatically here.

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 - Sets k8s network plugin (default 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.
  • loadbalancer_apiserver_localhost - makes all hosts to connect to the apiserver internally load balanced endpoint. Mutual exclusive to the loadbalancer_apiserver. See more details in the HA guide.

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

Note, if cloud providers have any use of the 10.233.0.0/16, like instances' private addresses, make sure to pick another values for kube_service_addresses and kube_pods_subnet, for example from the 172.18.0.0/16.

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.

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
  • kubelet_load_modules - For some things, kubelet needs to load kernel modules. For example, dynamic kernel services are needed for mounting persistent volumes into containers. These may not be loaded by preinstall kubernetes processes. For example, ceph and rbd backed volumes. Set this variable to true to let kubelet load kernel modules.

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.