Ubuntu18.04自启动脚本
ubuntu-16.10 开始不再使用initd管理系统，改用systemd。
用 systemctl 命令来替换了 service 和 chkconfig 的功能。
systemd 默认读取 /etc/systemd/system 下的配置文件，该目录下的文件会链接/lib/systemd/system/下的文件。
执行 ls /lib/systemd/system 你可以看到有很多启动脚本，其中就有我们需要的 rc.local.service
rc.local.service内容：
# This file is part of systemd.
#
# systemd is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
# This unit gets pulled automatically into multi-user.target by
# systemd-rc-local-generator if /etc/rc.local is executable.
[Unit]
Description=/etc/rc.local Compatibility
ConditionFileIsExecutable=/etc/rc.local
After=network.target
[Service]
Type=forking
ExecStart=/etc/rc.local start
TimeoutSec=0
RemainAfterExit=yes
一般正常的启动文件主要分成三部分
[Unit] 段: 启动顺序与依赖关系
[Service] 段: 启动行为,如何启动，启动类型
[Install] 段: 定义如何安装这个配置文件，即怎样做到开机启动
/etc/rc.local 的启动顺序是在网络后面，但是显然它少了 Install 段，也就没有定义如何做到开机启动，所以显然这样配置是无效的。 因此我们就需要在后面帮他加上 [Install] 段:
[Install]
WantedBy=multi-user.target
Alias=rc-local.service
ubuntu-18.04 默认是没有 /etc/rc.local 这个文件的，需要自己创建
sudo touch /etc/rc.local
把你需要启动脚本写入 /etc/rc.local
#!/bin/bash
# THIS FILE IS ADDED FOR COMPATIBILITY PURPOSES
#
# It is highly advisable to create own systemd services or udev rules
# to run scripts during boot instead of using this file.
#
# In contrast to previous versions due to parallel execution during boot
# this script will NOT be run after all other services.
#
# Please note that you must run 'chmod +x /etc/rc.d/rc.local' to ensure
# that this script will be executed during boot.
sudo -i touch /var/lock/subsys/local
sudo -i /usr/local/nginx/sbin/nginx
su - hsya -c "/mnt/cryptdisk/lz/elasticsearch-6.7.2/bin/elasticsearch -d"
sudo -i /bin/bash /mnt/cryptdisk/server/middleware.sh
还需要最后一步 前面我们说 systemd 默认读取 /etc/systemd/system 下的配置文件, 所以还需要在 /etc/systemd/system 目录下创建软链接
ln -s /lib/systemd/system/rc.local.service /etc/systemd/system/
middleware.sh脚本内容：
#!/bin/bash
sudo -i /mnt/cryptdisk/data/neo4j-community-3.5.7/bin/neo4j start
#cd /mnt/cryptdisk/data/neo4j-community-3.5.7/bin
#sudo -i ./neo4j start
#sudo -i nohup /mnt/cryptdisk/lz/cltp/cltp > logging.log 2>&1 &
cd /mnt/cryptdisk/lz/cltp
nohup ./cltp > logging.log 2>&1 &
#sudo -i nohup /mnt/cryptdisk/lz/product/product > logging.log 2>&1 &
cd /mnt/cryptdisk/lz/product
nohup ./product -u 0.0.0.0:1220 > logging.log 2>&1 &
sudo -i nohup java -jar /mnt/cryptdisk/server/data-parser-server.jar > logging.log 2>&1 &
#cd /mnt/cryptdisk/server
#sudo -i nohup java -jar ./data-parser-server.jar > logging.log 2>&1 &
sudo -i /mnt/cryptdisk/data/elasticsearch-head/npm run start &