Adding a QT Program to the Boot Auto-Start Service

This document describes how to modify systemd to auto-start a QT program at boot.

1 Create the systemd Configuration File

In the /etc/systemd/system/ directory, create a service configuration file. Take qt_display.service as an example.

# 在 /etc/systemd/system/ 目录下，创建服务配置文件
sudo vim /etc/systemd/system/qt_display.service

Configuration file example

# qt_display.service
[Unit]
Description=Qt Display Application
After=graphical.target
Requires=graphical.target
Wants=graphical.target

[Service]
Type=simple
ExecStartPre=/bin/sleep 10
ExecStart=/home/linaro/Desktop/ad_test/build-ad_display-Desktop-Debug/ad_display -d ad7606 -m 1
User=root
Environment="DISPLAY=:0"
Environment="XAUTHORITY=/root/.Xauthority"
Environment="LD_LIBRARY_PATH=/home/linaro/Desktop/qwt-6.1.4/build/lib:$LD_LIBRARY_PATH"
Restart=on-failure
RestartSec=3

[Install]
WantedBy=graphical.target

Meaning of each parameter in the configuration file

[Unit]

Description=Service description

After=The target or service after which this service starts

Requires=This service requires a target or service to be active before it can start.

Wants=This service wants a target or service to be active, but does not enforce it.

[Service]

Type=Service type

ExecStartPre=Commands and scripts to complete before the main process starts

ExecStart=Command to execute to start the service — main process

User=User identity under which the service runs

Environment=Set environment variables

Restart=Restart requirements for the service

RestartSec=Restart delay

[Install]

WantedBy=Specifies under which target this service is started

2 Start the System Service

Reload system services, enable and start the service.

# 重新加载系统服务
sudo systemctl daemon-reload

# 启用服务
sudo systemctl enable qt_display.service

#启动服务
sudo systemctl start qt_display.service

Check whether the service started normally. If it is normal, restart the system and verify whether the service auto-starts at boot. If there is a problem, run the following commands to query the error.

# 检查服务状态
sudo systemctl status qt_display.service

# 查看系统日志
journalctl -u qt_display.service

3 Other Common Commands

# 禁用系统服务
sudo systemctl disable qt_display.service

#停止服务
sudo systemctl stop qt_display.service