sap_general_preconfigure: Revert to ignoring DNS failures

Solves issue sap-linuxlab#784.

Signed-off-by: Bernd Finger <bfinger@redhat.com>

roles/sap_general_preconfigure/defaults/main.yml

@@ -146,6 +146,10 @@ sap_general_preconfigure_kernel_parameters: "{{ __sap_general_preconfigure_kerne
 sap_general_preconfigure_max_hostname_length: '13'
 # The maximum length of the hostname. See SAP note 611361.
 
+sap_general_preconfigure_ignore_dns_failures: true
+# Set to `false` for failing the role if one of the DNS name resolution check fails. The default is to
+# report such errors and continue running the role.
+
 # If "global" variables are set, use those. If not, default to the values from gather_facts:
 sap_general_preconfigure_ip: "{{ sap_ip | d(ansible_default_ipv4.address) }}"
 # The IPV4 address to be used for updating or checking `/etc/hosts` entries.

roles/sap_general_preconfigure/tasks/RedHat/generic/check-dns-name-resolution.yml

@@ -1,21 +1,24 @@
 # SPDX-License-Identifier: Apache-2.0
 ---
 
-- name: "Verify the correct DNS hostname to IP address resolution (A record) for {{ sap_general_preconfigure_hostname }}.{{ sap_general_preconfigure_domain }}"
+- name: "Verify the correct DNS hostname to IP address resolution (A record)"
   ansible.builtin.shell: test "$(dig {{ sap_general_preconfigure_hostname }}.{{ sap_general_preconfigure_domain }} +short)" = "{{ sap_general_preconfigure_ip }}"
   changed_when: false
   register: __sap_general_preconfigure_register_dns_test_a
   failed_when: __sap_general_preconfigure_register_dns_test_a.rc != 0
+  ignore_errors: "{{ sap_general_preconfigure_ignore_dns_failures | d(true) }}"
 
 ### BUG: dig does not use search path in resolv.conf on PPCle
-- name: "Verify the correct DNS hostname to IP address resolution (A record) using the hostname and the search list for {{ sap_general_preconfigure_hostname }}.{{ sap_general_preconfigure_domain }}"
+- name: "Verify the correct DNS hostname to IP address resolution (A record) using hostname and search list"
   ansible.builtin.shell: test "$(dig {{ sap_general_preconfigure_hostname }} +search +short)" = "{{ sap_general_preconfigure_ip }}"
   changed_when: false
   register: __sap_general_preconfigure_register_dns_test_searchlist
   failed_when: __sap_general_preconfigure_register_dns_test_searchlist.rc != 0
+  ignore_errors: "{{ sap_general_preconfigure_ignore_dns_failures | d(true) }}"
 
-- name: "Verify the correct DNS IP address to FQDN resolution (PTR record) for {{ sap_general_preconfigure_ip }}"
+- name: "Verify the correct DNS IP address to FQDN resolution (PTR record)"
   ansible.builtin.shell: test "$(dig -x {{ sap_general_preconfigure_ip }} +short)" = "{{ sap_general_preconfigure_hostname }}.{{ sap_general_preconfigure_domain }}."
   changed_when: false
   register: __sap_general_preconfigure_register_dns_test_ptr
   failed_when: __sap_general_preconfigure_register_dns_test_ptr.rc != 0
+  ignore_errors: "{{ sap_general_preconfigure_ignore_dns_failures | d(true) }}"