Add custom entrypoint for filebeat

Dockerfile

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+FROM docker.elastic.co/beats/filebeat:8.2.0
+
+# Switch to root user
+USER root
+
+#install jq to the container
+RUN apt-get update && apt-get install -y jq
+
+COPY entrypoint.sh /usr/local/bin/entrypoint.sh
+RUN chmod +x /usr/local/bin/entrypoint.sh
+
+ENTRYPOINT ["/usr/local/bin/entrypoint.sh"]

README.md

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+## Instructions
+
+1. Pull the filebeat image
+```bash
+docker pull docker.elastic.co/beats/filebeat:8.2.0
+```
+2. Change the filebeat image name or tag related to the version in the Docker file.
+
+3. Build the Docker image
+```bash
+docker build -t filebeat:8.2.0-entgra-v1 .
+```
+
+

entrypoint.sh

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+#!/bin/bash
+set -e
+
+# Path to the ECS metadata file
+METADATA_FILE=$(cat "$ECS_CONTAINER_METADATA_FILE")
+
+if [ -f "$METADATA_FILE" ]; then
+    # Extract HostPrivateIPv4Address from the metadata file
+    HOST_PRIVATE_IP=$(jq -r '.HostPrivateIPv4Address' < "$METADATA_FILE")
+    if [ "$HOST_PRIVATE_IP" != "null" ]; then
+        echo "Host Private IP: $HOST_PRIVATE_IP"
+        export HOST_PRIVATE_IP
+
+        # Define the input template file and output file
+        TEMPLATE_FILE="filebeat.template.yml"
+        OUTPUT_FILE="filebeat.yml"
+
+        mkdir -p /opt/filebeat-configs/${HOST_PRIVATE_IP}
+
+        # Replace the placeholder with the actual node name and write to the output file
+        sed "s/{{HOST_PRIVATE_IP}}/${HOST_PRIVATE_IP}/g" "/opt/filebeat-configs/$TEMPLATE_FILE" > "/opt/filebeat-configs/${HOST_PRIVATE_IP}/$OUTPUT_FILE"
+        echo "Filebeat configuration file created: $OUTPUT_FILE"
+
+        # Create symlinks
+        rm -rf /usr/share/filebeat/elk
+        ln -sf "/opt/logs/${HOST_PRIVATE_IP}/elk" /usr/share/filebeat/elk
+        ln -sf "/opt/filebeat-configs/${HOST_PRIVATE_IP}/filebeat.yml" /usr/share/filebeat/filebeat.yml
+    else
+        echo "HostPrivateIPv4Address not found in metadata file"
+    fi
+else
+    echo "Metadata file does not exist"
+fi
+
+# Run the original filebeat entrypoint
+exec /usr/bin/tini -- /usr/local/bin/docker-entrypoint "$@"