https://gist.githubusercontent.com/pexcn/dc3ebe60393cc4ede40b30e180d40ac5/raw/8c2439d5d583dd40d5af3e570949b9f0974357ba/alpine.sh 这是ovz，kvm不知道支不支持
https://www.vmocean.com/index.php?rp=/knowledgebase/9/How-to-install-Alpinelinux-under-128M-ram-and-2GB-disk.html
