- origin fork的库
- upstream 源库
- master本地库 通过本地maste库同步两者代码
upstream=> master =>origin
//添加远程仓库upstream
git remote add upstream git@github.com:apache/skywalking.git
git remote -vv
git fetch upstream
//upstream merge到本地master
git merge upstream/master
//上传到origin 库
git push origin master
