actualized for kubespray version 2.28.0

kubespray/project/roles/container-engine/docker/tasks/main.yml

@@ -50,7 +50,7 @@
   apt_key:
     id: "{{ item }}"
     url: "{{ docker_repo_key_info.url }}"
-    keyring: "{{ docker_repo_key_keyring|default(omit) }}"
+    keyring: "{{ docker_repo_key_keyring | default(omit) }}"
     state: present
   register: keyserver_task_result
   until: keyserver_task_result is succeeded

kubespray/project/roles/container-engine/docker/tasks/set_facts_dns.yml

@@ -10,12 +10,12 @@
 
 - name: Add upstream dns servers
   set_fact:
-    docker_dns_servers: "{{ docker_dns_servers + upstream_dns_servers | default([]) }}"
+    docker_dns_servers: "{{ docker_dns_servers + upstream_dns_servers }}"
   when: dns_mode in ['coredns', 'coredns_dual']
 
 - name: Add global searchdomains
   set_fact:
-    docker_dns_search_domains: "{{ docker_dns_search_domains + searchdomains | default([]) }}"
+    docker_dns_search_domains: "{{ docker_dns_search_domains + searchdomains }}"
 
 - name: Check system nameservers
   shell: set -o pipefail && grep "^nameserver" /etc/resolv.conf | sed -r 's/^nameserver\s*([^#\s]+)\s*(#.*)?/\1/'