Docker validator has 4 shards. (linera-io#2672)

* Docker validator has 4 shards

* Docker workflow should run when docker-compose.yml changes.

Author: christos-h

.github/workflows/docker.yml

@@ -8,6 +8,7 @@ on:
       - "**"
     paths:
       - 'docker/Dockerfile'
+      - 'docker/docker-compose.yml'
       - 'docker/compose.sh'
       - 'Cargo.toml'
       - '.github/workflows/docker.yml'
@@ -59,4 +60,4 @@ jobs:
           # Docker compose can take some time to start
           max_attempts: 5
           timeout_minutes: 2
-          command: sleep 60 && linera --wallet docker/wallet.json --storage rocksdb:docker/linera.db sync-balance
+          command: sleep 60 && linera --wallet docker/wallet.json --storage rocksdb:docker/linera.db sync-balance

configuration/compose/validator.toml

@@ -16,7 +16,25 @@ Grpc = "ClearText"
 Grpc = "ClearText"
 
 [[shards]]
-host = "shard"
+host = "docker-shard-1"
 port = 19100
-metrics_host = "shard"
+metrics_host = "docker-shard-1"
+metrics_port = 21100
+
+[[shards]]
+host = "docker-shard-2"
+port = 19100
+metrics_host = "docker-shard-2"
+metrics_port = 21100
+
+[[shards]]
+host = "docker-shard-3"
+port = 19100
+metrics_host = "docker-shard-3"
+metrics_port = 21100
+
+[[shards]]
+host = "docker-shard-4"
+port = 19100
+metrics_host = "docker-shard-4"
 metrics_port = 21100

docker/docker-compose.yml

@@ -19,7 +19,8 @@ services:
       - linera-shared:/shared
   shard:
     image: linera
-    container_name: shard
+    deploy:
+      replicas: 4
     command: [ "./compose-server-entrypoint.sh" ]
     volumes:
       - .:/config