diff --git a/src/main/python/ddadevops/domain/provs_k3s.py b/src/main/python/ddadevops/domain/provs_k3s.py
index 9a746d4..0cc3395 100644
--- a/src/main/python/ddadevops/domain/provs_k3s.py
+++ b/src/main/python/ddadevops/domain/provs_k3s.py
@@ -1,10 +1,60 @@
 from typing import List, Optional
+from string import Template
 from .common import (
     Validateable,
     DnsRecord,
     Devops,
 )
 
+CONFIG_BASE = """
+fqdn: $fqdn
+"""
+CONFIG_IPV4 = """node:
+  ipv4: $ipv4
+"""
+CONFIG_IPV6 = """  ipv6: $ipv6
+"""
+CONFIG_CERTMANAGER = """certmanager:
+  email: $letsencrypt_email
+  letsencryptEndpoint: $letsencrypt_endpoint
+"""
+CONFIG_ECHO = """echo: $echo
+"""
+
 class K3s(Validateable):
     def __init__(self, inp: dict):
-        pass
\ No newline at end of file
+        self.k3s_provision_user = inp.get("k3s_provision_user")
+        self.k3s_letsencrypt_email = inp.get("k3s_letsencrypt_email")
+        self.k3s_letsencrypt_endpoint = inp.get("k3s_letsencrypt_endpoint")
+        self.k3s_app_filename_to_provision = inp.get("k3s_app_filename_to_provision", "provs")
+        fqdn = inp.get("k3_fqdn")
+        ipv4 = inp.get("k3_ipv4")
+        ipv6 = inp.get("k3_ipv6")
+        self.provision_dns = DnsRecord(fqdn, ipv4=ipv4, ipv6=ipv6)
+        self.k3s_enable_echo = inp.get("k3s_enable_echo", False)
+        self.k3s_provs_template = inp.get("k3s_provs_template", None)
+
+    def validate(self) -> List[str]:
+        result = []
+        result += self.__validate_is_not_empty__("k3s_provision_user")
+        result += self.__validate_is_not_empty__("k3s_letsencrypt_email")
+        result += self.__validate_is_not_empty__("k3s_letsencrypt_endpoint")
+        result += self.__validate_is_not_empty__("k3s_app_filename_to_provision")
+        if self.provision_dns:
+            result += self.provision_dns.validate()
+        return result
+
+    def config_template(self) -> str:
+        template_text = self.k3s_provs_template
+        if template_text is None:
+            template_text = CONFIG_BASE
+            if self.k3s_letsencrypt_endpoint is not None:
+                template_text += CONFIG_CERTMANAGER
+            if self.k3s_enable_echo is not None:
+                template_text += CONFIG_ECHO
+            if self.provision_dns.ipv4 is not None:
+                template_text += CONFIG_IPV4
+            if self.provision_dns.ipv6  is not None:
+                template_text += CONFIG_IPV6
+        return template_text
+    
\ No newline at end of file
diff --git a/src/main/python/ddadevops/provs_k3s_mixin.py b/src/main/python/ddadevops/provs_k3s_mixin.py
index 028687c..65c1e71 100644
--- a/src/main/python/ddadevops/provs_k3s_mixin.py
+++ b/src/main/python/ddadevops/provs_k3s_mixin.py
@@ -66,27 +66,9 @@ class ProvsK3sMixin(DevopsBuild):
         inp["build_types"]=config.get("build_types", [])
         inp["mixin_types"]=config.get("mixin_types", [])
         super().__init__(project, inp)
-        provs_k3s_mixin_config = config['ProvsK3sMixin']
-        self.fqdn = provs_k3s_mixin_config['fqdn']
-        self.put('fqdn', self.fqdn)
-        self.provision_user = provs_k3s_mixin_config['provision_user']
-        self.put('provision_user', self.provision_user)
-        self.ipv4 = provs_k3s_mixin_config['ipv4']
-        self.put('ipv4', self.ipv4)
-        self.ipv6 = provs_k3s_mixin_config['ipv6']
-        self.put('ipv6', self.ipv6)
-        self.letsencrypt_email = provs_k3s_mixin_config['letsencrypt_email']
-        self.put('letsencrypt_email', self.letsencrypt_email)
-        self.letsencrypt_endpoint = provs_k3s_mixin_config['letsencrypt_endpoint']
-        self.put('letsencrypt_endpoint', self.letsencrypt_endpoint)
-        self.echo = provs_k3s_mixin_config['echo']
-        self.put('echo', self.echo)
-        self.k3s_config_template_text = provs_k3s_mixin_config['k3s_config_template']
-        self.k3s_config_template = Template(
-            provs_k3s_mixin_config['k3s_config_template'])
-        self.put('k3s_config_template', self.k3s_config_template)
-        self.app_filename_to_provision = provs_k3s_mixin_config['app_filename_to_provision']
-        self.put('app_filename_to_provision', self.app_filename_to_provision)
+        devops = self.devops_repo.get_devops(self.project)
+        if BuildType.K3S not in devops.specialized_builds:
+            raise ValueError("K3SBuild requires BuildType.K3S")
 
     def update_runtime_config(self, fqdn, ipv4, ipv6=None):
         self.fqdn = fqdn
diff --git a/src/test/python/domain/helper.py b/src/test/python/domain/helper.py
index d9cc9cf..ba53370 100644
--- a/src/test/python/domain/helper.py
+++ b/src/test/python/domain/helper.py
@@ -19,6 +19,14 @@ def devops_config(overrides: dict) -> dict:
         "c4k_grafana_cloud_password": "password",
         "c4k_grafana_cloud_url": "https://prometheus-prod-01-eu-west-0.grafana.net/api/prom/push",
         "c4k_auth": {},
+        "k3s_provision_user": "k3s_provision_user",
+        "k3s_letsencrypt_email": "k3s_letsencrypt_email",
+        "k3s_letsencrypt_endpoint": "k3s_letsencrypt_endpoint",
+        "k3s_enable_echo": False,
+        "k3s_app_filename_to_provision": "provs",
+        "k3_fqdn": "example.org",
+        "k3_ipv4": "1.2.3.4",
+        "k3_ipv6": "::1",
         "release_type": "NONE",
         "release_main_branch": "main",
         "release_current_branch": "my_feature",
diff --git a/src/test/python/domain/test_provs_k3s.py b/src/test/python/domain/test_provs_k3s.py
index be81e0e..e4693b1 100644
--- a/src/test/python/domain/test_provs_k3s.py
+++ b/src/test/python/domain/test_provs_k3s.py
@@ -11,3 +11,8 @@ from .helper import build_devops
 def test_creation():
     sut = build_devops({})
     assert BuildType.K3S in sut.specialized_builds
+    assert sut.specialized_builds[BuildType.K3S]
+
+def test_should_calculate_template():
+    sut = build_devops({}).specialized_builds[BuildType.K3S]
+    assert "fqdn:" in sut.config_template()