Initial commit

.github/workflows/build.yml

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+name: "Build"
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ vars.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Login to ghcr.io
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Generate Docker metadata
+        id: docker-meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            docker.io/${{ github.repository }}
+            ghcr.io/${{ github.repository }}
+          flavor: latest=false
+          tags: |
+            type=ref,event=branch
+
+      - name: Generate GitHub metadata
+        id: github-meta
+        uses: dockerbakery/github-metadata-action@v2
+
+      - name: Build and push
+        uses: docker/bake-action@v4
+        with:
+          push: ${{ github.event_name != 'pull_request' }}
+          files: |
+            ./docker-bake.hcl
+            ${{ steps.docker-meta.outputs.bake-file }}
+            ${{ steps.github-meta.outputs.bake-file }}
+          set: |
+            *.cache-from=type=gha
+            *.cache-to=type=gha,mode=max
+
+      - name: Docker Metadata Summary
+        uses: dockerbakery/docker-metadata-summary@v1

Dockerfile

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+ARG PROMTAIL_VERSION=latest
+FROM grafana/promtail:${PROMTAIL_VERSION}
+ADD rootfs /
+ENTRYPOINT [ "/docker-entrypoint.sh" ]
+VOLUME [ "/promtail" ]

Makefile

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+make:
+	docker buildx bake local --load

README.md

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+# About
+
+A customized Grafana Promtail for Docker Swarm.

docker-bake.hcl

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+variable "PROMTAIL_VERSION" { default = "latest" }
+
+target "docker-metadata-action" {}
+target "github-metadata-action" {}
+
+target "default" {
+    inherits = [ "promtail" ]
+    platforms = [
+        "linux/amd64",
+        "linux/arm64"
+    ]
+}
+
+target "local" {
+    inherits = [ "promtail" ]
+    tags = [ "swarmlibs/promtail:local" ]
+}
+
+target "promtail" {
+    context = "."
+    dockerfile = "Dockerfile"
+    inherits = [
+        "docker-metadata-action",
+        "github-metadata-action",
+    ]
+    args = {
+        PROMTAIL_VERSION = "${PROMTAIL_VERSION}"
+    }
+}

rootfs/docker-entrypoint.sh

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+#!/bin/bash
+# Copyright (c) Swarm Library Maintainers.
+# SPDX-License-Identifier: MIT
+
+set -e
+
+PROMTAIL_CONFIG_FILE="/etc/promtail/promtail-config.yaml"
+
+# -- The log level of the Promtail server
+PROMTAIL_LOGLEVEL=${PROMTAIL_LOGLEVEL:-"info"}
+
+# -- The log format of the Promtail server
+# Valid formats: `logfmt, json`
+PROMTAIL_LOGFORMAT=${PROMTAIL_LOGFORMAT:-"logfmt"}
+
+# The config of clients of the Promtail server
+PROMTAIL_CLIENT_URL=${PROMTAIL_CLIENT_URL:-"http://loki:3100/loki/api/v1/push"}
+
+# -- Configures where Promtail will save it's positions file, to resume reading after restarts.
+PROMTAIL_POSITION_FILENAME=${PROMTAIL_POSITION_FILENAME:-"/promtail/positions.yaml"}
+
+# -- The config to enable tracing
+PROMTAIL_ENABLE_TRACING=${PROMTAIL_ENABLE_TRACING:-"false"}
+
+# -- Config file contents for Promtail.
+cat <<EOF >${PROMTAIL_CONFIG_FILE}
+server:
+  log_level: ${PROMTAIL_LOGLEVEL}
+  log_format: ${PROMTAIL_LOGFORMAT}
+  http_listen_port: 9080
+
+clients:
+  - url: ${PROMTAIL_CLIENT_URL}
+
+positions:
+  filename: ${PROMTAIL_POSITION_FILENAME}
+
+tracing:
+      enabled: ${PROMTAIL_ENABLE_TRACING}
+EOF
+
+cat <<EOF >>${PROMTAIL_CONFIG_FILE}
+scrape_configs:
+  - job_name: docker
+
+    docker_sd_configs:
+      - host: unix:///var/run/docker.sock
+        refresh_interval: 10s
+
+    relabel_configs:
+      - source_labels: ['__meta_docker_container_name']
+        regex: '/(.*)'
+        target_label: 'container'
+
+      # ================================================================================
+      # Label mapping
+      # ================================================================================
+      - action: labelmap
+        regex: __meta_docker_container_label_com_(docker_.*)
+
+      # Rename labels docker_swarm_(.+) to dockerswarm_\$1
+      # This is useful for compatibility with "dockerswarm-tasks.yml" relabeling
+      - action: labelmap
+        regex: __meta_docker_container_label_com_docker_swarm_(.+)
+        replacement: dockerswarm_\$1
+      - action: labeldrop
+        regex: (^docker_swarm_.+)
+
+      # ================================================================================
+      # Docker Swarm compatible relabeling
+      # - dockerswarm_task_name
+      # ================================================================================
+
+      # Set "task" label to "<service_name>.<task_slot>
+      - source_labels:
+        - dockerswarm_task_name
+        target_label: task
+        regex: (.+)\.(.+)\.(.+)
+        replacement: \$1.\$2
+
+      # ================================================================================
+      # Kubernetes compatible relabeling
+      # - namespace
+      # - deployment
+      # - pod
+      # ================================================================================
+      # # Set Kubernetes's Namespace with "com.docker.stack.namespace" label
+      - source_labels:
+        - __meta_docker_container_label_com_docker_stack_namespace
+        target_label: namespace
+
+      # Set Kubernetes's Deployment with "com.docker.stack.namespace" label
+      - source_labels:
+        - __meta_docker_container_label_com_docker_swarm_service_name
+        target_label: deployment
+
+      # Set Kubernetes's Pod Name with Docker Swarm's Service Name
+      - source_labels:
+        - dockerswarm_task_name
+        target_label: pod
+        regex: (.*)
+EOF
+
+# If the user is trying to run Prometheus directly with some arguments, then
+# pass them to Prometheus.
+if [ "${1:0:1}" = '-' ]; then
+    set -- promtail "$@"
+fi
+
+# If the user is trying to run Prometheus directly with out any arguments, then
+# pass the configuration file as the first argument.
+if [ "$1" = "" ]; then
+    set -- promtail -config.file=${PROMTAIL_CONFIG_FILE}
+fi
+
+echo "==> Starting Promtail..."
+set -x
+exec "$@"