feat: update filebeat dockerfile to support arm v7 and v6 (armhf)

Dockerfile

@@ -1,4 +1,23 @@
+FROM golang:1.18.1-alpine3.15 as builder
 ARG ELASTICSTACK_VERSION=8.1.2
-FROM docker.elastic.co/beats/filebeat:${ELASTICSTACK_VERSION}
+
+WORKDIR /build
+
+ENV GOMAXPROCS="4"
+
+RUN apk update
+RUN apk add git bash make gcc musl-dev binutils-gold
+RUN git clone --single-branch --branch="v${ELASTICSTACK_VERSION}" --depth=1 https://github.com/elastic/beats.git
+RUN cd beats/filebeat/ && \
+    make
+
+
+FROM alpine:3.15
 
 COPY --chown=root:filebeat filebeat.yml /usr/share/filebeat/filebeat.yml
+COPY --chmod=750 --from=builder /build/beats/filebeat/filebeat /usr/local/bin/filebeat
+COPY --chmod=750 entrypoint.sh /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]
+
+CMD ["filebeat", "-e", "--strict.perms=false", "-c", "/usr/share/filebeat/filebeat.yml"]

entrypoint.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env sh
+
+if [ -n "$ELASTICSEARCH_PASSWORD_FILE" ]; then
+  ELASTICSEARCH_PASSWORD=$(cat "$ELASTICSEARCH_PASSWORD_FILE");
+  export ELASTICSEARCH_PASSWORD;
+fi
+
+# Initialize kibana stuff related to metric and filebeat
+filebeat setup --dashboards --index-management -e \
+  -E output.elasticsearch.hosts=["$ELASTICSEARCH_HOSTS"] \
+  -E output.elasticsearch.username="$ELASTICSEARCH_USERNAME" \
+  -E output.elasticsearch.password="$ELASTICSEARCH_PASSWORD" \
+  -E output.elasticsearch.ssl.verification_mode=none \
+  -E setup.kibana.host="$KIBANA_HOSTS" \
+  -E setup.kibana.ssl.verification_mode=none \
+  -c /usr/share/filebeat/filebeat.yml
+
+exec "$@"

filebeat.yml

@@ -12,9 +12,11 @@ processors:
   - add_cloud_metadata: ~
 
 output.elasticsearch:
-  hosts: '${ELASTICSEARCH_HOSTS:elasticsearch:9200}'
+  hosts: '[${ELASTICSEARCH_HOSTS:elasticsearch:9200}]'
   username: '${ELASTICSEARCH_USERNAME:}'
   password: '${ELASTICSEARCH_PASSWORD:}'
+  ssl:
+    verification_mode: none
 
 #filebeat.inputs:
 #  - type: container