ubuntu服务名中的@是什么意思

Question

如图，带@的服务在用systemctl控制时必须要指定用户名才行

Answer 1

请题主无视上面那个人说的，他说的那是linux连接的含义，和题主的问题显然不是一个

linux系统结构/lib/systemd/system/目录
该目录自动存放启动文件的配置位置，里面一般包含有XXXXX.service

首先明确，@符号和前面的字符串，组成了模板，后面的是统一的后缀service

引用：https://wiki.archlinux.org/title/Systemd

Note: Some unit names contain an @ sign (e.g. [e-mail]): this means that they are instances of a template unit, whose actual file name does not contain the string part (e.g. name@.service). string is called the instance identifier, and is similar to an argument that is passed to the template unit when called with the systemctl command: in the unit file it will substitute the %i specifier. To be more accurate, before trying to instantiate the name@.suffix template unit, systemd will actually look for a unit with the exact [e-mail] file name, although by convention such a "clash" happens rarely, i.e. most unit files containing an @ sign are meant to be templates. Also, if a template unit is called without an instance identifier, it will generally fail (except with certain systemctl commands, like cat).

另外一个模板service的举例你可以看一下，更方便理解