post_install() {
  grep -E "^redis:" etc/group >/dev/null || groupadd --system redis
  grep -E "^redis:" etc/passwd >/dev/null || useradd --system -g redis -d /var/lib/redis -s /bin/false redis
  touch var/log/redis.log
  chown redis:redis var/log/redis.log
  systemd-tmpfiles --create redis.conf
  install -dm0700 var/lib/redis
  chown -R redis:redis var/lib/redis
}

post_upgrade() {
  post_install
  echo "Redis starts from redis user by default. Check redis.service file"
}