added 'monitoring' path - ask devs why it's there

monitoring/artc0/mysqld-exporter-docker.sh

@@ -0,0 +1,53 @@
+#!/bin/sh
+# Deploy mysqld_exporter as Docker container on artc0
+# Run once as root / sudo after creating the MariaDB monitoring user below.
+#
+# PREREQUISITE — run in mysql:
+#   CREATE USER 'exporter'@'localhost' IDENTIFIED BY 'ExporterPass2026!' WITH MAX_USER_CONNECTIONS 3;
+#   GRANT PROCESS, REPLICATION CLIENT, SELECT ON *.* TO 'exporter'@'localhost';
+#   FLUSH PRIVILEGES;
+#
+# Then run this script.
+
+set -e
+
+CONTAINER_NAME="mysqld_exporter"
+CNF_FILE="/etc/mysqld-exporter.cnf"
+
+# Write config file if not present
+if [ ! -f "$CNF_FILE" ]; then
+  cat > "$CNF_FILE" << 'EOF'
+[client]
+user=exporter
+password=ExporterPass2026!
+socket=/run/mysqld/mysqld.sock
+EOF
+  chmod 644 "$CNF_FILE"
+fi
+
+# Get socket GID to allow container user to access it
+SOCK_GID=$(stat -c '%g' /run/mysqld/mysqld.sock)
+
+# Stop existing container if running
+docker stop "$CONTAINER_NAME" 2>/dev/null || true
+docker rm   "$CONTAINER_NAME" 2>/dev/null || true
+
+# Run with Unix socket mount — MariaDB uses skip-networking (no TCP)
+docker run -d \
+  --name "$CONTAINER_NAME" \
+  --restart unless-stopped \
+  --user "65534:${SOCK_GID}" \
+  -v "${CNF_FILE}:/etc/.my.cnf:ro" \
+  -v "/run/mysqld/mysqld.sock:/run/mysqld/mysqld.sock:ro" \
+  -p 9104:9104 \
+  prom/mysqld-exporter:latest \
+  --config.my-cnf=/etc/.my.cnf \
+  --collect.info_schema.innodb_metrics \
+  --collect.global_status \
+  --collect.global_variables \
+  --web.listen-address=":9104"
+
+echo "mysqld_exporter started, listening on :9104"
+sleep 3
+docker logs "$CONTAINER_NAME" 2>&1 | tail -5
+curl -s http://localhost:9104/metrics | grep 'mysql_up'