time_sync.sh

#!/usr/bin/env bash

###############################################################################
# Copyright 2017 The Apollo Authors. All Rights Reserved.
#
# Licensed 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.
###############################################################################

sudo apt-get install -y ntpdate

grep -q ntpdate /etc/crontab

if [ $? -eq 1 ]; then
    echo "*/1 * * * * root ntpdate -v -u us.pool.ntp.org" | sudo tee -a /etc/crontab
fi

# ntpdate running log at /var/log/syslog

sudo ntpdate -v -u us.pool.ntp.org