4、Zero Downtime Linux and Systemd Scripting

Zero Downtime Linux and Systemd Scripting

1. Custom Systemd Startup Scripts

Custom init scripts are often necessary as not all applications come with their own. Here are some examples of writing custom systemd startup scripts:

1.1 Simple Cleanup Script

The following is a simple systemd startup script named chrisbinnie - cleanup :

[Unit]
Description=Clear out an old disk cache somewhere
[Service]
Type=oneshot
ExecStart=/usr/sbin/chrisbinnie-cleanup
[Install]
WantedBy=multi-user.target

In this example, the Type=oneshot indicates that the unit executes an action and then stops. To enable it to start at boot time, run the command: