renamed inventory file

restructured to support more generic k3s single host or cluster deployment

ex-inv_k3s.yml

@@ -13,20 +13,5 @@ all:
       ansible_host: 192.168.122.232
     node3:
       ansible_host: 192.168.122.233
-  children:
-    master:
-      hosts:
-        node1:
-    workers:
-      hosts:
-        node2:
-        node3:
-  # Global variables
-  vars:
-    # Switch to control whether we are creating a cluster, or just
-    # deploying to a single host
-    do_cluster: true
-    # Minimum hosts for our cluster
-    minhosts: "3"
 
 # EOF

k3s.yml

@@ -3,29 +3,29 @@
 #
 # This is the top level playbook for the 'k3s' role.
 #
-# This role will install a k3s cluster to three or more target hosts.
+# This playbook will install k3s to one or more hosts. If there are multiple
+# hosts the first inventory host will be the master node, and all others will
+# be worker nodes.
 #
-# This role requires at least three target hosts, previously deployed. Each
-# host should have at least 4GB of RAM and at least a 20GB disk.
+# This playbook will only setup simple clusters with a single master node. To
+# setup an HA cluster with multiple master nodes, please refer to the following
+# URL and perform the cluster installation manually.
+#
+# * https://docs.k3s.io/installation/ha-embedded
+#
+# Each host should have at least 4GB of RAM and at least a 20GB disk.
 #
 # It is also assumed that the user running the playbook has SSH key access
 # set up for the root user on the target hosts.
 #
-# NOTE: If you are installing in a proxied environment, make sure that you
-#       have either 'HTTP_PROXY' or 'HTTPS_PROXY' (case is not important)
-#       defined in your env variables (usually via ~/.bashrc). In addition
-#       to that, you also need to have 'NO_PROXY' (again, case is not
-#       important) also defined. This is where the k3s installer will
-#       retrieve the relevant proxy configuration values.
-#
 ###########################################################################
 #
 # This playbook can be run using the following command line;
 #
-# ansible-playbook -i <inventory file> -e "username=<username>" k3s.yml
+# ansible-playbook -i <inventory file> -e "k3s_user=<username>" k3s.yml
 #
 # ie,
-# ansible-playbook -i k3s_inventory.yml -e "username=someuser" k3s.yml
+# ansible-playbook -i ex-inv_k3s.yml -e "k3s_user=someuser" k3s.yml
 #
 ###########################################################################
 
@@ -37,12 +37,15 @@
     - role: k3s
       vars:
         # Calculate the number of target hosts
-        numhosts: "{{ groups['all'] | length }}"
+        numhosts: "{{ ansible_play_hosts | length }}"
+        master_host: "{{ ansible_play_hosts[0] }}"
+        master_ip: "{{ hostvars[master_host].ansible_host }}"
+
         # Set the following variable as required
         # ie,
-        #     username: someuser
+        #     k3s_user: someuser
         #
         # Default is to apply the playbook against the root user
-        username: "root"
+        k3s_user: "root"
 
 # EOF