airflow-scheduler.service for Ubuntu - see #CHANGE in the file

airflow-scheduler.service

# Apache Airflow Scheduler Service file for Ubuntu 18
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
# 
#   http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

[Unit]
Description=Airflow scheduler daemon
After=network.target postgresql.service mysql.service redis.service rabbitmq-server.service
Wants=postgresql.service mysql.service redis.service rabbitmq-server.service

[Service]
#CHANGE change here to your airflow bin folder (here i'm using /home/vagrant/.local/bin)
#EnvironmentFile=/etc/sysconfig/airflow
Environment="PATH=/home/vagrant/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
User=airflow
Group=airflow
Type=simple
#CHANGE change here to your airflow bin folder (here i'm using /home/vagrant/.local/bin)
#ExecStart=/bin/airflow scheduler
ExecStart=/home/vagrant/.local/bin/airflow scheduler
Restart=always
RestartSec=5s

[Install]
WantedBy=multi-user.target