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Linus Wallgren
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Add example on how to update prometheus targets
This will build a deb packge (does not follow the debian guidelines) that can be installed which updates a target list in the format expected by file_sd_config[0] every 20 seconds. [0]: https://prometheus.io/docs/prometheus/latest/configuration/configuration/#file_sd_config
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‎examples/updater/.gitignore‎

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./build/

‎examples/updater/Makefile‎

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.POSIX:
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.SUFFIXES:
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NAME=pushprox-updater
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# the 0- is prepended until a version of this repo is tagged
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VERSION=0-$(shell git describe --always --match v[0-9]* HEAD | cut -c2-)
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OUT_DIR=build
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PACKAGE_DIR=$(OUT_DIR)/$(NAME)-$(VERSION)
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$(PACKAGE_DIR)/: \
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$(PACKAGE_DIR)/DEBIAN/ \
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$(PACKAGE_DIR)/lib/systemd/system/$(NAME).service \
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$(PACKAGE_DIR)/lib/systemd/system/$(NAME).timer \
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$(PACKAGE_DIR)/usr/bin/pushprox-updater \
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@touch "$@"
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$(PACKAGE_DIR)/DEBIAN/: \
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$(PACKAGE_DIR)/DEBIAN/conffile \
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$(PACKAGE_DIR)/DEBIAN/control \
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$(PACKAGE_DIR)/DEBIAN/postinst \
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$(PACKAGE_DIR)/DEBIAN/postrm \
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$(PACKAGE_DIR)/DEBIAN/prerm \
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@touch "$@"
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$(PACKAGE_DIR)/DEBIAN/control: debian/control
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(cat debian/control && echo -n 'Version: ' && echo "${VERSION}") > "$@"
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$(PACKAGE_DIR)/DEBIAN/%: debian/%
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@mkdir -p "$(dir $@)"
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cp -p "debian/$*" "$@"
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$(PACKAGE_DIR)/lib/systemd/system/%: %
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@mkdir -p $(PACKAGE_DIR)/lib/systemd/system
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cp -r "$<" "$@"
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$(PACKAGE_DIR)/usr/bin/pushprox-updater: update.sh
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@mkdir -p "$(dir $@)"
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cp -p "$<" "$@"
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.PHONY: deb
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deb: $(PACKAGE_DIR).deb
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$(PACKAGE_DIR).deb: $(PACKAGE_DIR)/
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chmod 755 $(PACKAGE_DIR)/DEBIAN/postinst
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chmod 755 $(PACKAGE_DIR)/DEBIAN/postrm
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chmod 755 $(PACKAGE_DIR)/DEBIAN/prerm
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fakeroot dpkg-deb --build "${PACKAGE_DIR}"
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.PHONY: release
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release: clean $(PACKAGE_DIR).deb
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hub release create --attach="$(PACKAGE_DIR).deb" "$(VERSION)"
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.PHONY: clean
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clean:
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rm -rf "$(OUT_DIR)"

‎examples/updater/debian/conffile‎

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‎examples/updater/debian/control‎

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Package: pushprox-updater
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Architecture: all
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Maintainer: linus <[email protected]>
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Depends: bash, jq, curl, coreutils
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Description: Update a prometheus static scrape config based on what is found by
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PushProx

‎examples/updater/debian/postinst‎

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#!/bin/sh
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set -e
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# summary of how this script can be called:
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# * <postinst> `configure' <most-recently-configured-version>
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# * <old-postinst> `abort-upgrade' <new version>
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# * <conflictor's-postinst> `abort-remove' `in-favour' <package>
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# <new-version>
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# * <postinst> `abort-remove'
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# * <deconfigured's-postinst> `abort-deconfigure' `in-favour'
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# <failed-install-package> <version> `removing'
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# <conflicting-package> <version>
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# for details, see https://www.debian.org/doc/debian-policy/ or
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# the debian-policy package
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case "$1" in
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configure)
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if ! getent group pushprox-updater >/dev/null; then
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addgroup --quiet --system pushprox-updater
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fi
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if ! getent passwd pushprox-updater >/dev/null; then
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adduser --quiet --system --ingroup pushprox-updater --shell /usr/sbin/nologin pushprox-updater
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fi
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systemctl daemon-reload
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systemctl enable --now pushprox-updater.timer
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;;
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abort-upgrade|abort-remove|abort-deconfigure)
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;;
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*)
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echo "postinst called with unknown argument \`$1'" >&2
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exit 1
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;;
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esac
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exit 0

‎examples/updater/debian/postrm‎

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#!/bin/sh
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set -e
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# summary of how this script can be called:
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# * <postrm> `remove'
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# * <postrm> `purge'
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# * <old-postrm> `upgrade' <new-version>
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# * <new-postrm> `failed-upgrade' <old-version>
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# * <new-postrm> `abort-install'
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# * <new-postrm> `abort-install' <old-version>
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# * <new-postrm> `abort-upgrade' <old-version>
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# * <disappearer's-postrm> `disappear' <overwriter>
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# <overwriter-version>
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# for details, see https://www.debian.org/doc/debian-policy/ or
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# the debian-policy package
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case "$1" in
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purge|remove|upgrade|failed-upgrade|abort-install|abort-upgrade|disappear)
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systemctl daemon-reload
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;;
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*)
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echo "postrm called with unknown argument \`$1'" >&2
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exit 1
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;;
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esac
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exit 0

‎examples/updater/debian/prerm‎

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#!/bin/sh
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set -e
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# summary of how this script can be called:
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# * <prerm> `remove'
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# * <old-prerm> `upgrade' <new-version>
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# * <new-prerm> `failed-upgrade' <old-version>
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# * <conflictor's-prerm> `remove' `in-favour' <package> <new-version>
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# * <deconfigured's-prerm> `deconfigure' `in-favour'
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# <package-being-installed> <version> `removing'
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# <conflicting-package> <version>
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# for details, see https://www.debian.org/doc/debian-policy/ or
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# the debian-policy package
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case "$1" in
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remove)
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systemctl disable --now pushprox-updater.timer
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;;
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upgrade|deconfigure)
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;;
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failed-upgrade)
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;;
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*)
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echo "prerm called with unknown argument \`$1'" >&2
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exit 1
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;;
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esac
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exit 0

‎examples/updater/pushprox-updater.service‎

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[Unit]
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Description=Update the prometheus static file config based off of PushProx
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[Service]
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User=pushprox-updater
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Group=pushprox-updater
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EnvironmentFile=-/etc/default/pushprox-updater
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ExecStart=/usr/bin/pushprox-updater
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NoNewPrivileges=true
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PrivateTmp=yes
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PrivateDevices=true

‎examples/updater/pushprox-updater.timer‎

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[Unit]
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Description=Update the prometheus static file config based off of PushProx
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[Timer]
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OnStartupSec=20s
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OnUnitInactiveSec=20s
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[Install]
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WantedBy=timers.target

‎examples/updater/update.sh‎

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#!/bin/bash
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set -euo pipefail
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host=${PUSHPROX_HOST:-localhost:8080}
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ports=${PUSHPROXY_PORTS:-9100}
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sd_file=${PUSHPROXY_FILE:-/etc/prometheus/file_sd/clients.json}
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tmpfile=$(mktemp --suffix "pushprox-target-updater")
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trap 'rm -f "$tmpfile"' EXIT
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if ! curl -s "$host/clients" | jq --argjson ports "[$ports]" '
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. | map(.targets[0] as $target | {
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targets: $ports | map(tostring) | map($target + ":" + .)
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})' > "$tmpfile"; then
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echo >&2 "Failed to update inventory"
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exit 2
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fi
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chmod a+r "$tmpfile"
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mv "$tmpfile" "$sd_file"

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