PHP cURL consistently taking 15s to resolve DNS

Question

I\'m running PHP on a CentOS virtual machine under MacOS X, and any cURL request consistently takes 15s to run:

$c =          


        

Answer 1

The problem was an IPv6 lookup failing on my machine. The solution:

Changed /etc/resolv.conf to:

nameserver 8.8.8.8
nameserver 8.8.4.4

After rebooting, resolv.conf got overwritten, so adding this line to /etc/sysconfig/network-scripts/ifcfg-eth0 (which was using BOOTPROTO=dhcp) fixed the problem:

PEERDNS=no

And everything now works like a charm.

As an alternative, if you experience this problem on a server on which you can not change the configuration, configure cURL this way:

curl_setopt($curl, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);