Script to Update Prometheus and Alertmanager straight forward

update_prometheus.sh

#!/bin/bash

bindir="/usr/local/bin"
binuser="root"
bingroup="root"
unamearch=$(uname -m)

case $unamearch in
  (i386)    arch=386;;
  (x86_64)  arch=amd64;;
  (aarch64) arch=arm64;;
  (armv7l)  arch=armv7;;
  (armv6l)  arch=armv6;;
  (*)       arch=amd64;;
esac

echo "System architecure: $arch"

if [[ -f "$bindir/prometheus" ]]; then
  prometheus_version_installed=v$($bindir/prometheus --version | head -n1 | awk '{print $3}')
  prometheus_version_github=$(curl -s https://api.github.com/repos/prometheus/prometheus/releases/latest | jq -r .tag_name)

  echo "Prometheus version installed: $prometheus_version_installed"
  echo "Prometheus version Github: $prometheus_version_github"

  if [ $prometheus_version_installed != $prometheus_version_github ]; then
    echo "# Update Prometheus and Promtool"

    tempdir="/tmp/prometheus"
    promuser="prometheus"
    promgroup="prometheus"
    promconfigfolder="/etc/prometheus"

    mkdir -p $tempdir
    wget --quiet https://github.com/prometheus/prometheus/releases/download/$prometheus_version_github/prometheus-${prometheus_version_github:1}.linux-$arch.tar.gz -O $tempdir/prometheus_${prometheus_version_github:1}.tar.gz
    tar xvf $tempdir/prometheus_${prometheus_version_github:1}.tar.gz -C $tempdir
    systemctl stop prometheus.service
    cp $tempdir/prometheus-${prometheus_version_github:1}.linux-$arch/prometheus $bindir/
    cp $tempdir/prometheus-${prometheus_version_github:1}.linux-$arch/promtool $bindir/
    chown $binuser:$bingroup $bindir/prometheus
    chown $binuser:$bingroup $bindir/promtool
    cp -r $tempdir/prometheus-${prometheus_version_github:1}.linux-$arch/consoles $promconfigfolder/
    cp -r $tempdir/prometheus-${prometheus_version_github:1}.linux-$arch/console_libraries $promconfigfolder/
    chown -R $promuser:$promgroup $promconfigfolder/consoles
    chown -R $promuser:$promgroup $promconfigfolder/console_libraries
    systemctl start prometheus.service
    rm -rf $tempdir

    prometheus_newversion_installed=v$($bindir/prometheus --version | head -n1 | awk '{print $3}')
    if [ $prometheus_newversion_installed == $prometheus_version_github ]; then
      echo "Prometheus updated to version $prometheus_newversion_installed"
      systemctl status prometheus.service | tail -n1
    else
      echo "!!! Update failed !!!"
    fi
  else
    echo "Current version $prometheus_version_installed up to date."
  fi
else
  echo "Prometheus not installed on $bindir/prometheus"
fi

if [[ -f "$bindir/alertmanager" ]]; then
  alertmanager_version_installed=v$($bindir/alertmanager --version | head -n1 | awk '{print $3}')
  alertmanager_version_github=$(curl -s https://api.github.com/repos/prometheus/alertmanager/releases/latest | jq -r .tag_name)

  echo "Alertmanager version installed: $alertmanager_version_installed"
  echo "Alertmanager version GitHub: $alertmanager_version_github"

  if [ $alertmanager_version_installed != $alertmanager_version_github ]; then
    echo "# Update Alertmanager and Amtool"

    amtempdir="/tmp/alertmanager"

    mkdir -p $amtempdir
    wget --quiet https://github.com/prometheus/alertmanager/releases/download/$alertmanager_version_github/alertmanager-${alertmanager_version_github:1}.linux-$arch.tar.gz -O $amtempdir/alertmanager_${alertmanager_version_github:1}.tar.gz
    tar xvf $amtempdir/alertmanager_${alertmanager_version_github:1}.tar.gz -C $amtempdir
    systemctl stop alertmanager.service
    cp $amtempdir/alertmanager-${alertmanager_version_github:1}.linux-$arch/alertmanager $bindir/
    cp $amtempdir/alertmanager-${alertmanager_version_github:1}.linux-$arch/amtool $bindir/
    chown $binuser:$bingroup $bindir/alertmanager
    chown $binuser:$bingroup $bindir/amtool
    systemctl start alertmanager.service
    rm -rf $amtempdir

    alertmanager_newversion_installed=v$($bindir/alertmanager --version | head -n1 | awk '{print $3}')
    if [ $alertmanager_newversion_installed == $alertmanager_version_github ]; then
      echo "Alertmanager updated to version $alertmanager_newversion_installed"
      systemctl status alertmanager.service | tail -n1
    else
      echo "!!! Update failed !!!"
    fi
  else
    echo "Current version $alertmanager_version_github up to date."
  fi
else
  echo "Alertmanager not installed on $bindir/alertmanager"
fi