Update to 2022-08-02 11:00

roles/nomad/defaults/main.yml

@@ -38,6 +38,30 @@ nomad_base_conf:
     #     read_only: False
     host_volumes: []
 
+    # An arbitrary string which can be used for job placement
+    # node_class: prod
+
+    # Resource reservation for the host to work properly
+    reserved:
+      # Unit is MHz
+      cpu: 200
+      # can be expressed as number, in which case it'll be the amount of RAM to reserve in MB
+      # or as a percentage, in which case it'll be a percentage of the total RAM
+      memory: 15%
+      # When memory is expressed as a percentage, you can set a minimum amount (in MB) which will be set
+      # if the percentage is less than that
+      memory_min: 500
+      # Unit is MB
+      disk: 500
+      # List of reserved ports which won't be allocated on tasks
+      reserved_ports: []
+
+    # Custom metadata to add in Nomad's conf
+    # meta:
+    #   rack: 12-1
+    #   cni: macvlan,ipvlan
+    meta: {}
+
   # Server related settings
   server:
     # Should server be enabled
@@ -59,6 +83,7 @@ nomad_base_conf:
     # Consul and vault optional URL. This is just to add a shortcut in Nomad's UI
     # consul_ui: https://consul.example.org
     # vault_ui: https://vault.example.org
+
 # You can override part of the default config without rewriting everything else
 # the dict will get merged
 nomad_extra_conf: {}

roles/nomad/templates/nomad.hcl.j2

@@ -56,6 +56,24 @@ client {
 {% endif %}
   }
 {% endfor %}
+
+  reserved {
+    cpu = {{ nomad_conf.client.reserved.cpu }}
+    memory = {{ (nomad_conf.client.reserved.memory is search('%$')) | ternary([((nomad_conf.client.reserved.memory | regex_replace('%$', '') | int) * ansible_memtotal_mb * 0.01), nomad_conf.client.reserved.memory_min] | max | int, nomad_conf.client.reserved.memory) }}
+    disk = {{ nomad_conf.client.reserved.disk }}
+    reserved_ports = "{{ nomad_conf.client.reserved.reserved_ports | join(',') }}"
+  }
+
+  meta {
+{% for meta in nomad_conf.client.meta.keys() | list %}
+    {{ meta }} = "{{ nomad_conf.client.meta[meta] }}"
+{% endfor %}
+  }
+
+{% if nomad_conf.client.node_class is defined %}
+  node_class = "{{ nomad_conf.client.node_class }}"
+{% endif %}
+
 }
 
 ui {
@@ -71,3 +89,4 @@ ui {
   }
 {% endif %}
 }
+