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golang离线环境依赖包问题

nats-server系统服务只能使用sc命令注册

妙音 posted @ 2021年8月19日 02:42 in golang with tags nats , 1706 阅读
 

起因描述

 
windows环境下nats-server注册成系统, 官方推荐是sc命令
 
而我觉得sc命令台太麻烦, 为什么不用github.com/kardianos/service，或者更方便的工具呢?
 

方法一：使用nssm通过界面进行配置

 
1. 下载地址
 
http://nssm.cc/download
 
2. 过程省略
 
3. 结果死活不行，由于是第三方工具，出错找不到原因，放弃
 
 

方法二：通过服务外壳作为系统服务

 
* 介绍
 
使用go生成一个demo.exe，再将demo.exe注册成系统，demo.exe读取配置文件，然后demo.exe通过exec.Command启动nats-server.exe
 
go比较好用的库可以用github.com/kardianos/service
 
 
* demo.exe启动nats-server.exe关键源码
 
p.cmd = exec.Command(fullExec, p.Args...)
p.cmd.Dir = p.Dir
p.cmd.Env = append(os.Environ(), p.Env...)
 
* demo.json配置示例
 
{
"Name": "demo",
"DisplayName": "demo",
"Description": "demo for nats-server",

"Dir": "d:\\nats-server",
"Exec": "xxxx\\nats-server.exe",
"Args": ["-c ","xxx\\nats-server.conf"],
"Env": [
],

"Stderr": "C:\\log\\nats_err.log",
"Stdout": "C:\\log\\nats_out.log"
}
 
* 结果报错
 
The service process could not connect to the service controller.
 
意思是一个服务不能连接到另一个服务，啥意思呢？ 也就是通过exec.Command启动的竟然是服务，不应该是exe么.
 
* nats-server启动源码分析
 
nats-server.exe的启动入口源码
 
func Run(server *Server) error {
    //入口1：docker
if dockerized {
server.Start()
return nil
}
isInteractive, err := svc.IsAnInteractiveSession()
if err != nil {
return err
}
    //入口2: 交互模式
if isInteractive {
server.Start()
return nil
}
    //入口3: 启动服务(serviceName被写死了，只能是nats-server)
return svc.Run(serviceName, &winServiceWrapper{server})
}
 
* 错误原因总结
 
当以外壳方式启动时，走的是"入口3"，也是启动服务，如果没有nats-server，它就啥事也没干，结果nats-server并没有启动
 

方法三：sc命令

 
官方推荐
 

总结

 
1、nat-server只能以sc命令注册成服务。怕麻烦可以写一个bat。
 
2、nats-server服务名只能是nats-server
 
 
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