add healthcheck for container composition

Author: Trim

compose.yaml

@@ -18,25 +18,39 @@ services:
       - data-uploads:/linuxfr.org/uploads
     tmpfs:
       - /linuxfr.org/public/tmp:size=100M
+    healthcheck:
+      test: curl --fail http://localhost:3000
     depends_on:
-      - database
-      - redis
+      database:
+        condition: service_completed_successfully
+        restart: true
+      redis:
+        condition: service_completed_successfully
+        restart: true
 
   linuxfr-board:
     build:
       context: deployment/linuxfr-board
     env_file:
       - deployment/default.env
+    healthcheck:
+      test: curl --fail -I http://localhost:9000
     depends_on:
-      - redis
+      redis:
+        condition: service_completed_successfully
+        restart: true
 
   linuxfr-img:
     build:
       context: deployment/linuxfr-img
     env_file:
       - deployment/default.env
+    healthcheck:
+      test: curl --fail http://localhost:8000/status
     depends_on:
-      - redis
+      redis:
+        condition: service_completed_successfully
+        restart: true
     volumes:
       - cache-img:/linuxfr-img/cache
 
@@ -53,9 +67,15 @@ services:
         published: 127.0.0.1:80
         protocol: tcp
     depends_on:
-      - linuxfr.org
-      - linuxfr-board
-      - linuxfr-img
+      linuxfr.org:
+        condition: service_completed_successfully
+        restart: true
+      linuxfr-board:
+        condition: service_completed_successfully
+        restart: true
+      linuxfr-img:
+        condition: service_completed_successfully
+        restart: true
 
   database:
     build:
@@ -66,11 +86,15 @@ services:
       - target: 3306
         published: 127.0.0.1:3306
         protocol: tcp
+    healthcheck:
+      test: mysqladmin ping -h 127.0.0.1 -u $$MYSQL_USER --password=$$MYSQL_PASSWORD
     volumes:
       - data-database:/var/lib/mysql
 
   redis:
     image: docker.io/redis:5
+    healthcheck:
+      test: redis-cli --raw incr ping
     volumes:
       - data-redis:/data
 

deployment/linuxfr-board/Containerfile

@@ -16,8 +16,10 @@ RUN \
   IFS=$'\n\t'; \
   apt-get update; \
   # Install dependencies \
+  # and add curl to be used by the healthcheck defined in compose.yaml \
   apt-get install -y --no-install-recommends \
-    build-essential git ruby ruby-dev; \
+    build-essential git ruby ruby-dev \
+    curl; \
   apt-get clean;
 
 USER ${UID}

deployment/linuxfr-img/Containerfile

@@ -31,6 +31,15 @@ FROM docker.io/debian:bullseye-slim as deploy
 USER ${UID}
 WORKDIR /linuxfr-img
 
+# Install curl to be used by the healthcheck defined in compose.yaml
+RUN \
+  set -eux; \
+  IFS=$'\n\t'; \
+  apt-get update; \
+  apt-get install -y --no-install-recommends \
+    curl; \
+  apt-get clean;
+
 COPY --from=build --chown=${UID}:0 --chmod=770 /linuxfr-img/bin/img-LinuxFr.org .
 
 EXPOSE 8000