Support multiple inventory files under individual inventory directory

inventory/sample/group_vars/all.yml

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+# Valid bootstrap options (required): ubuntu, coreos, centos, none
+bootstrap_os: none
+
+#Directory where etcd data stored
+etcd_data_dir: /var/lib/etcd
+
+# Directory where the binaries will be installed
+bin_dir: /usr/local/bin
+
+## The access_ip variable is used to define how other nodes should access
+## the node.  This is used in flannel to allow other flannel nodes to see
+## this node for example.  The access_ip is really useful AWS and Google
+## environments where the nodes are accessed remotely by the "public" ip,
+## but don't know about that address themselves.
+#access_ip: 1.1.1.1
+
+### LOADBALANCING AND ACCESS MODES
+## Enable multiaccess to configure etcd clients to access all of the etcd members directly
+## as the "http://hostX:port, http://hostY:port, ..." and ignore the proxy loadbalancers.
+## This may be the case if clients support and loadbalance multiple etcd servers  natively.
+#etcd_multiaccess: true
+
+### ETCD: disable peer client cert authentication.
+# This affects ETCD_PEER_CLIENT_CERT_AUTH variable
+#etcd_peer_client_auth: true
+
+## External LB example config
+## apiserver_loadbalancer_domain_name: "elb.some.domain"
+#loadbalancer_apiserver:
+#  address: 1.2.3.4
+#  port: 1234
+
+## Internal loadbalancers for apiservers
+#loadbalancer_apiserver_localhost: true
+
+## Local loadbalancer should use this port instead, if defined.
+## Defaults to kube_apiserver_port (6443)
+#nginx_kube_apiserver_port: 8443
+
+### OTHER OPTIONAL VARIABLES
+## 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 to true to allow kubelet to load kernel
+## modules.
+# kubelet_load_modules: false
+
+## Internal network total size. This is the prefix of the
+## entire network. Must be unused in your environment.
+#kube_network_prefix: 18
+
+## With calico it is possible to distributed routes with border routers of the datacenter.
+## Warning : enabling router peering will disable calico's default behavior ('node mesh').
+## The subnets of each nodes will be distributed by the datacenter router
+#peer_with_router: false
+
+## Upstream dns servers used by dnsmasq
+#upstream_dns_servers:
+#  - 8.8.8.8
+#  - 8.8.4.4
+
+## There are some changes specific to the cloud providers
+## for instance we need to encapsulate packets with some network plugins
+## If set the possible values are either 'gce', 'aws', 'azure', 'openstack', 'vsphere', or 'external'
+## When openstack is used make sure to source in the openstack credentials
+## like you would do when using nova-client before starting the playbook.
+#cloud_provider:
+
+## When azure is used, you need to also set the following variables.
+## see docs/azure.md for details on how to get these values
+#azure_tenant_id:
+#azure_subscription_id:
+#azure_aad_client_id:
+#azure_aad_client_secret:
+#azure_resource_group:
+#azure_location:
+#azure_subnet_name:
+#azure_security_group_name:
+#azure_vnet_name:
+#azure_route_table_name:
+
+## When OpenStack is used, Cinder version can be explicitly specified if autodetection fails (Fixed in 1.9: https://github.com/kubernetes/kubernetes/issues/50461)
+#openstack_blockstorage_version: "v1/v2/auto (default)"
+## When OpenStack is used, if LBaaSv2 is available you can enable it with the following 2 variables.
+#openstack_lbaas_enabled: True
+#openstack_lbaas_subnet_id: "Neutron subnet ID (not network ID) to create LBaaS VIP"
+## To enable automatic floating ip provisioning, specify a subnet.
+#openstack_lbaas_floating_network_id: "Neutron network ID (not subnet ID) to get floating IP from, disabled by default"
+## Override default LBaaS behavior
+#openstack_lbaas_use_octavia: False
+#openstack_lbaas_method: "ROUND_ROBIN"
+#openstack_lbaas_provider: "haproxy"
+#openstack_lbaas_create_monitor: "yes"
+#openstack_lbaas_monitor_delay: "1m"
+#openstack_lbaas_monitor_timeout: "30s"
+#openstack_lbaas_monitor_max_retries: "3"
+
+## Uncomment to enable experimental kubeadm deployment mode
+#kubeadm_enabled: false
+#kubeadm_token_first: "{{ lookup('password', inventory_dir + '/credentials/kubeadm_token_first length=6  chars=ascii_lowercase,digits') }}"
+#kubeadm_token_second: "{{ lookup('password', inventory_dir + '/credentials/kubeadm_token_second length=16 chars=ascii_lowercase,digits') }}"
+#kubeadm_token: "{{ kubeadm_token_first }}.{{ kubeadm_token_second }}"
+#
+## Set these proxy values in order to update package manager and docker daemon to use proxies
+#http_proxy: ""
+#https_proxy: ""
+## Refer to roles/kubespray-defaults/defaults/main.yml before modifying no_proxy
+#no_proxy: ""
+
+## Uncomment this if you want to force overlay/overlay2 as docker storage driver
+## Please note that overlay2 is only supported on newer kernels
+#docker_storage_options: -s overlay2
+
+# Uncomment this if you have more than 3 nameservers, then we'll only use the first 3.
+#docker_dns_servers_strict: false
+
+## Default packages to install within the cluster, f.e:
+#kpm_packages:
+#  - name: kube-system/grafana
+
+## Certificate Management
+## This setting determines whether certs are generated via scripts or whether a
+## cluster of Hashicorp's Vault is started to issue certificates (using etcd
+## as a backend). Options are "script" or "vault"
+#cert_management: script
+
+# Set to true to allow pre-checks to fail and continue deployment
+#ignore_assert_errors: false
+
+## Etcd auto compaction retention for mvcc key value store in hour
+#etcd_compaction_retention: 0
+
+## Set level of detail for etcd exported metrics, specify 'extensive' to include histogram metrics.
+#etcd_metrics: basic
+
+# The read-only port for the Kubelet to serve on with no authentication/authorization. Uncomment to enable.
+# kube_read_only_port: 10255