解决Jenkins部署nodejs服务的问题

jenkins部署nodejs项目，经过几番折腾，最终部署成功，分解步骤如下
执行步骤见下文执行过的命令，按循序执行即可

代码拉取后进入jenkins的workspace目录中，然后开始一步一步验证，确保手动成功启动服务后，再通过jenkins自动部署

# cd $WORKSPACE
# npm -i
# npm audit fix

出现Module not found: Error: Can’t resolve 'stylus-loader’错误，需要安装stylus stylus-loader两个模块

# npm install stylus stylus-loader

在运行npm run build的时候出现错误sh: cross-env: command not found
cross-env，则需要安装cross-env模块

# npm install cross-env

编译完成后，需要将项目文件和依赖的模块都移到生产环境目录中

# rsync -a --progress --exclude ".git" $WORKSPACE/server/ /home/homework/xxxx/
# rsync -a --progress --exclude ".git" $WORKSPACE/node_modules /home/homework/xxxx/

启动服务

# cd /home/homework/xxxx
# npm start

> [email protected] start /mnt/homework/addot
> cross-env mode=prod pm2 start app.js -i max

events.js:174
      throw er; // Unhandled 'error' event
      ^

Error: spawn pm2 ENOENT
    at Process.ChildProcess._handle.onexit (internal/child_process.js:246:19)
    at onErrorNT (internal/child_process.js:421:16)
    at internalTickCallback (internal/process/next_tick.js:72:19)
    at process._tickCallback (internal/process/next_tick.js:47:5)
    at Function.Module.runMain (internal/modules/cjs/loader.js:779:11)
    at executeUserCode (internal/bootstrap/node.js:342:17)
    at startExecution (internal/bootstrap/node.js:276:5)
    at startup (internal/bootstrap/node.js:227:5)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:743:3)
Emitted 'error' event at:
    at Process.ChildProcess._handle.onexit (internal/child_process.js:252:12)
    at onErrorNT (internal/child_process.js:421:16)
    [... lines matching original stack trace ...]
    at bootstrapNodeJSCore (internal/bootstrap/node.js:743:3)

经过几番周折，觉得是不是要用pm2命令启动一下试试？结果发现问题了，测试命令报错pm2: command not found，那就安装pm2命令，安装后在node目录里面生成pm2可执行文件，最后做个软连接

# npm install -g pm2
# ln -s /home/homework/node-v11.4.0-linux-x64/lib/node_modules/pm2/bin/pm2 /usr/bin/
# pm2 -V         
[PM2] Spawning PM2 daemon with pm2_home=/root/.pm2
[PM2] PM2 Successfully daemonized
3.2.4

再次运行npm start项目启动成功，后面使用jenkins部署即可！！！