git clone过程中SSL certificate problem: self signed certificate

在我的vps上使用git出现：
git Problem with the SSL CA cert (path? access rights?)

网上大概有三种解决方案，我用了下面这种，因为我可以用ssh链接但https链接却一直鉴权失败
git config --global url."git@github.com:".insteadOf "https://github.com/"
cat ~/.gitconfig
[url "git@github.com:"]
	insteadOf = https://github.com/

其他两种的链接：http://derekmolloy.ie/fixing-git-and-curl-certificates-problem-on-beaglebone-blac/