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How to Resolve PHP Curl Error: couldn't resolve host

couldn't resolve host

Found a Curl error:

couldn't resolve host ''

It seemed that Curl was trying to resolve the domain name, but failed to do it. My first guess is that it's a permission issue of httpd, like ACL.

Let's check SELinux boolean value of httpd.

[root@www ~]# getsebool -a | grep httpd
httpd_can_network_connect --> off


There is a suspect permission called httpd_can_network_connect in the list, which could be the key to the problem.

Let's enable the permission.

[root@www ~]# setsebool -P httpd_can_network_connect on
[root@www ~]# getsebool -a | grep httpd
httpd_can_network_connect --> on

Don't forget to restart httpd after enabling.

[root@web ~]# service httpd restart
Stopping httpd:                                            [  OK  ]
Starting httpd:                                            [  OK  ]

Then, try the PHP code again, it's back to normal.

If you have already enabled httpd_can_network_connect, restarting httpd service might be helpful.

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