feat: Implemented a notification service for unhealthy containers.

.templates/bin/containermon_redeploy

@@ -0,0 +1,74 @@
+#!/bin/bash
+#
+# https://github.com/containrrr/shoutrrr/tree/main
+# https://github.com/RafhaanShah/Container-Mon
+#
+# Email notification settings below assume the gateway acting
+# as a smarthost and Docker version v20.10+ is required.
+
+image="ghcr.io/rafhaanshah/container-mon"
+instance="containermon"
+networks=""
+outfile=""
+volume=""
+
+MSG_MISSINGDEP="Fatal: missing dependency"
+
+# Checks the dependencies.
+TR=$(which tr 2>/dev/null)
+if [ -z "$TR" ]; then echo "$MSG_MISSINGDEP tr."; exit 1 ; fi
+for item in cat dirname docker hostname
+do
+    if [ -n "$(which $item)" ]
+    then export $(echo $item | "$TR" '[:lower:]' '[:upper:]')=$(which $item)
+    else echo "$MSG_MISSINGDEP $item." >&2; exit 1; fi
+done
+
+# Stops and removes the container (if necessary).
+if [ -n "$("$DOCKER" ps -q -f name=$instance)" ]
+then "$DOCKER" stop "$instance"; fi
+if [ -n "$("$DOCKER" ps -a -q -f name=$instance)" ]
+then "$DOCKER" rm "$instance"; fi
+
+# Checks for an upgrade.
+$DOCKER pull "$image"
+
+# Creates the container.
+$DOCKER create \
+    -e TZ="Europe/Budapest" \
+    -e CONTAINERMON_CHECK_EXIT_CODE=false \
+    -e CONTAINERMON_CHECK_STOPPED=false \
+    -e CONTAINERMON_CRON="*/2 * * * *" \
+    -e CONTAINERMON_FAIL_LIMIT=1 \
+    -e CONTAINERMON_NOTIFICATION_URL="smtp://host.docker.internal:25/?from=$USER@$("$HOSTNAME" -f)&to=$USER@$("$HOSTNAME")&subject=[[Containermon $(hostname)]]" \
+    -e CONTAINERMON_HEALTHY_NOTIFICATION_URL="smtp://host.docker.internal:25/?from=$USER@$("$HOSTNAME" -f)&to=$USER@$("$HOSTNAME")&subject=[[Containermon $(hostname)]]" \
+	-e CONTAINERMON_NOTIFY_HEALTHY=true \
+    -e CONTAINERMON_MESSAGE_PREFIX="" \
+    -e CONTAINERMON_USE_LABELS=true \
+    -v /var/run/docker.sock:/var/run/docker.sock \
+    --add-host="host.docker.internal:host-gateway" \
+    --restart unless-stopped \
+    --label "com.centurylinklabs.watchtower.enable=true" \
+    --name $instance $image
+
+# Connects it to the network(s).
+if [ -n "$networks" ]; then
+    for network in $networks
+    do
+        # Checks the network, creates it if necessary.
+        if [ -z "$("$DOCKER" network ls -q -f name=$network)" ]
+        then "$DOCKER" network create -d bridge "$network"; fi
+        # Then connects.
+        $DOCKER network connect $network $instance
+    done
+fi
+
+# Finally launches it.
+$DOCKER start $instance
+# Adds the time zone handler package to the running container.
+$DOCKER exec  $instance sh -c "apk add tzdata"
+if [ -n "$outfile" -a -w "$("$DIRNAME" "$outfile")" ]; then
+    # Sets a background process to collect the image's output.
+    # This process will automatically terminate when the image stops.
+    "$DOCKER" logs -f $instance >>"$outfile" 2>&1 &
+fi

.templates/bin/watchtower_redeploy

@@ -58,6 +58,7 @@ $DOCKER create \
     --add-host="host.docker.internal:host-gateway" \
     --restart unless-stopped \
     --label "com.centurylinklabs.watchtower.enable=true" \
+    --label "containermon.enable=true" \
     --name $instance $image
 
 # Connects it to the network(s).