adding the coder stack file

docker-stack/coder.yml

@@ -7,10 +7,40 @@ networks:
     external: true
 
 services:
+  ## use this unsafe proxy to gain access to the docker socket.
+  ## group_add as suggested by coder oss isn't avaiable in compose 3
+  ## even if it's supported, adding a group repliably over multiple
+  ## nodes isn't possible because the group id for 'docker' may not be
+  ## the same across multiple nodes.
+  coder-socat-service:
+    image: docker.io/alpine/socat:latest
+    hostname: coder-socat-service-host
+    command: tcp-listen:2375,fork,reuseaddr unix-connect:/var/run/docker.sock
+    environment:
+      - DS_NODE_NAME={{.Node.Hostname}}
+      - DS_SERVICE_NAME={{.Service.Name}}
+      - DS_TASK_NAME={{.Task.Name}}
+    volumes:
+      - type: bind
+        source: /var/run/docker.sock
+        target: /var/run/docker.sock
+    networks:
+      - coder-network
+    deploy:
+      mode: global
+      placement:
+        constraints:
+          - node.role == manager
+      resources:
+        limits:
+          memory: 10MB
+
   coder-service:
     image: ghcr.io/coder/coder:latest
     hostname: coder-service-host
     tty: true
+    depends_on:
+      - coder-socat-service
     environment:
       - DS_NODE_NAME={{.Node.Hostname}}
       - DS_SERVICE_NAME={{.Service.Name}}
@@ -22,6 +52,7 @@ services:
       - CODER_OIDC_EMAIL_DOMAIN=miflux.com
       - CODER_OIDC_CLIENT_ID=8fc09269-57cd-4a03-a66b-6fb357d8abec
       - CODER_OIDC_CLIENT_SECRET=gto_7hfqdkyg3tfc6ho5zuv2k34wl4jmnwxctzp32kvujrrmjf4bb2ta
+      - DOCKER_HOST=tcp://coder-socat-service-host:2375
     networks:
       - coder-network
       - traefik-network  
@@ -42,11 +73,11 @@ services:
     deploy:
       mode: replicated
       replicas: 1
-      placement:
-        max_replicas_per_node: 1
-        ##constraints:
-        ##  - node.labels.location == home
-        ##  - node.hostname == rose
+      ##placement:
+      ##  max_replicas_per_node: 1
+      ##  constraints:
+      ##    - node.labels.location == home
+      ##    - node.hostname == rose
       resources:
         limits:
           memory: 1GB

docker-stack/traefik.yml

@@ -17,6 +17,7 @@ services:
       - DS_SERVICE_NAME={{.Service.Name}}
       - DS_TASK_NAME={{.Task.Name}}
     volumes:
+      # direct binding is ok for the constraints 'node.role == manager' below
       - type: bind
         source: /var/run/docker.sock
         target: /var/run/docker.sock
@@ -44,7 +45,8 @@ services:
     deploy:
       mode: global
       placement:
-        constraints: [node.role == manager]
+        constraints:
+          - node.role == manager
     command:
       - --log.level=INFO
       - --accessLog