在我的mac上，运行golang程序调用http接口报如下错误：
golang报 dial tcp lookup xx.hsmob.com no such host错误

但实际域名是通的，报错如下:

W0527 10:54:34.046009   16869 zeus.go:141] not found members in appid:xmn-sys-comm-setting-bloc-hotel, error: Get "http://cmdbv3.internal.hsmob.com/api/v3/application/xmn-sys-comm-setting-bloc-hotel/member": dial tcp: lookup cmdbv3.internal.hsmob.com: no such host
W0527 10:54:34.046236   16869 zeus.go:141] not found members in appid:xmn-sys-comm-setting-flat, error: Get "http://cmdbv3.internal.hsmob.com/api/v3/application/xmn-sys-comm-setting-flat/member": dial tcp: lookup cmdbv3.internal.hsmob.com: no such host
W0527 10:54:34.046475   16869 zeus.go:141] not found members in appid:saas-fe-login-frontend, error: Get "http://cmdbv3.internal.hsmob.com/api/v3/application/saas-fe-login-frontend/member": dial tcp: lookup cmdbv3.internal.hsmob.com: no such host

后来网上查了下，说可能是file descriptors的问题。

luohui@luohuideMBP16 ~/yaml $ ulimit -a
-t: cpu time (seconds)              unlimited
-f: file size (blocks)              unlimited
-d: data seg size (kbytes)          unlimited
-s: stack size (kbytes)             8176
-c: core file size (blocks)         0
-v: address space (kbytes)          unlimited
-l: locked-in-memory size (kbytes)  unlimited
-u: processes                       5333
-n: file descriptors                256
luohui@luohuideMBP16 ~/yaml $ ulimit -n 655350

调大就好了。

umlimit -n 81920