Anyone else encountering DNS resolution issues?

Seeing this coming out of one of our apps:

``` Traceback (most recent call last): File "/usr/lib/python3.5/site-packages/urllib3/connection.py", line 141, in _new_conn (self.host, self.port), self.timeout, **extra_kw) File "/usr/lib/python3.5/site-packages/urllib3/util/connection.py", line 60, in create_connection for res in socket.getaddrinfo(host, port, family, socket.SOCK_STREAM): File "/usr/lib64/python3.5/socket.py", line 733, in getaddrinfo for res in _socket.getaddrinfo(host, port, family, type, proto, flags): socket.gaierror: [Errno -3] Temporary failure in name resolution During handling of the above exception, another exception occurred: ... Traceback (most recent call last): File "/usr/lib/python3.5/site-packages/requests/adapters.py", line 440, in send timeout=timeout File "/usr/lib/python3.5/site-packages/urllib3/connectionpool.py", line 639, in urlopen _stacktrace=sys.exc_info()[2]) File "/usr/lib/python3.5/site-packages/urllib3/util/retry.py", line 388, in increment raise MaxRetryError(_pool, url, error or ResponseError(cause)) urllib3.exceptions.MaxRetryError: HTTPSConnectionPool(host='api.github.com', port=443): Max retries exceeded with url: /user (Caused by NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x7febf8618b00>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution',)) ```

And indeed, running a `getent ahostsv4 api.github.com` returns rc=2 in a running container. Even `ci.centos.org` is not resolving.