set memory and cpu limits on the container

Signed-off-by: Jakub Sokołowski <jakub@status.im>

defaults/main.yml

@@ -19,6 +19,12 @@ beacon_node_metrics_port: 9200
 # rpc / administrative
 beacon_node_rpc_port: 9900
 
+# resource limits, mem in MB
+beacon_node_cpu_limit: 0.60
+beacon_node_mem_limit: '{{ (ansible_memtotal_mb * 0.6) | int }}'
+beacon_node_cpu_reserve: 0.20
+beacon_node_mem_reserve: '{{ (ansible_memtotal_mb * 0.2) | int }}'
+
 # general container management
 compose_state: 'present'
 compose_recreate: 'smart'

tasks/container.yml

@@ -15,6 +15,14 @@
           container_name: '{{ beacon_node_cont_name }}'
           image: '{{ beacon_node_cont_image }}'
           restart: 'always'
+          deploy:
+            resources:
+              limits:
+                cpus: '{{ beacon_node_cpu_limit | string }}'
+                memory: '{{ beacon_node_mem_limit }}M'
+              reservations:
+                cpus: '{{ beacon_node_cpu_reserve | string }}'
+                memory: '{{ beacon_node_mem_reserve }}M'
           ports:
             - '127.0.0.1:{{ beacon_node_rpc_port }}:{{ beacon_node_rpc_port }}/tcp'
             - '{{ beacon_node_metrics_port }}:{{ beacon_node_metrics_port }}/tcp'