Use systemd-resolved instead of dhclient on Alinux 2023

Signed-off-by: Hanwen <[email protected]>

cookbooks/aws-parallelcluster-environment/resources/network_service/network_service_alinux2023.rb

@@ -20,5 +20,5 @@
 use 'partial/_network_service_redhat_based'
 
 def network_service_name
-  'NetworkManager'
+  'systemd-resolved'
 end

cookbooks/aws-parallelcluster-slurm/resources/dns_domain/dns_domain_alinux2023.rb

@@ -13,26 +13,17 @@
 end
 
 use 'partial/_dns_domain_common'
-use 'partial/_dns_domain_redhat'
 
-# Configure custom dns domain (only if defined) by appending the Route53 domain created within the cluster
-# ($CLUSTER_NAME.pcluster) and be listed as a "search" domain in the resolv.conf file.
-action :configure do
-  return if on_docker?
+def search_domain_config_path
+  # Configure resolved to automatically append Route53 search domain in resolv.conf.
+  # On Ubuntu18 resolv.conf is managed by systemd-resolved.
+  '/etc/systemd/resolved.conf'
+end
 
-  # On RHEL8 dhclient is not enabled by default
-  # Put pcluster version of NetworkManager.conf in place
-  # dhcp = dhclient needs to be added under [main] section to enable dhclient
-  # https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/considerations_in_adopting_rhel_8/networking_considerations-in-adopting-rhel-8#dhcp_plugin_networking
-  cookbook_file 'NetworkManager.conf' do
-    path '/etc/NetworkManager/NetworkManager.conf'
-    source 'dns_domain/NetworkManager.conf'
-    cookbook 'aws-parallelcluster-slurm'
-    user 'root'
-    group 'root'
-    mode '0644'
-  end
+def append_pattern
+  'Domains=*'
+end
 
-  action_update_search_domain
-  network_service 'Restart network service'
+def append_line
+  "Domains=#{node['cluster']['dns_domain']}"
 end