init

Dockerfile

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+# Dockerfile
+FROM alpine:latest
+
+RUN apk add --no-cache curl bash dcron
+
+WORKDIR /app
+
+COPY warm.sh /app/warm.sh
+RUN chmod +x /app/warm.sh
+
+CMD ["sh", "/app/warm.sh"]

README.md

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+To use you must generate file list: example for astro.build
+
+```
+cd dist && \
+    ( \
+      find . -name "*.html" \
+        | sed 's|^\./||' \
+        | sed 's|index.html$||' \
+      && \
+      find _astro -type f \
+    ) | sort -u > files-list.txt
+```

docker-compose.yml

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+version: "3.9"
+
+services:
+  cache-warmer:
+    build:
+      context: ./
+      dockerfile: Dockerfile
+    environment:
+      BASE_URL: "https://example.net"
+      FILE_LIST: "/files-list.txt"
+      CRON_EXPR: "0 */12 * * *"
+      USER_AGENT: "Mozilla/5.0"
+      ACCEPT_ENCODING: "br,gzip"
+    restart: always

warm.sh

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+#!/bin/bash
+set -e
+
+BASE_URL="${BASE_URL:?BASE_URL env not set}"
+FILE_LIST="${FILE_LIST:?FILE_LIST env not set}"
+CRON_EXPR="${CRON_EXPR:-0 */12 * * *}"
+USER_AGENT="${USER_AGENT:-Mozilla/5.0}"
+ACCEPT_ENCODING="${ACCEPT_ENCODING:-br,gzip}"
+
+echo "$(date) - Starting cache warmer for $BASE_URL$FILE_LIST"
+echo "Cron schedule: $CRON_EXPR"
+
+cat << EOF > /app/warm_files.sh
+#!/bin/sh
+set -e
+
+BASE_URL="$BASE_URL"
+FILE_LIST="$FILE_LIST"
+USER_AGENT="$USER_AGENT"
+ACCEPT_ENCODING="$ACCEPT_ENCODING"
+
+echo "\$(date) - Fetching file list from \$BASE_URL\$FILE_LIST"
+
+# WAŻNE: --compressed automatycznie dekompresuje odpowiedź
+FILES=\$(curl -s --compressed -A "\$USER_AGENT" "\$BASE_URL\$FILE_LIST")
+
+if [ -z "\$FILES" ]; then
+  echo "\$(date) - File list empty"
+  exit 1
+fi
+
+echo "\$FILES" | while read -r url; do
+  if [ -n "\$url" ]; then
+    echo "\$(date) - Warming \$BASE_URL/\$url"
+    curl -s -o /dev/null -A "\$USER_AGENT" -H "Accept-Encoding: \$ACCEPT_ENCODING" "\$BASE_URL/\$url"
+  fi
+done
+
+echo "\$(date) - Warming completed"
+EOF
+
+chmod +x /app/warm_files.sh
+touch /var/log/cron.log
+
+echo "$(date) - Running initial warming..."
+/app/warm_files.sh
+
+echo "$CRON_EXPR /app/warm_files.sh >> /var/log/cron.log 2>&1" > /etc/crontabs/root
+
+echo "$(date) - Starting crond..."
+crond -f -l 2 &
+tail -f /var/log/cron.log