Port 53 is reserved for the Domain Name System (DNS). In your case it is the DNS cacher "/usr/sbin/dnsmasq" of the package dnsmasq-base that's causing this error message.
This pre-installed package is a dependency of network-manager, the Network Manager of your desktop environment (e.g. Unity, GNOME, …). If you'd like to keep NetworkManager alive, you can create a custom DNS in order to move the SkyDNS server to a different port (i.e. 8053) and have the dnsmasq server forward local requests to it by installing dnsmasq (fully) and following these guides: - http://red.ht/1Im8qLI - http://bit.ly/1J5FCHf Otherwise, consider the following comments - http://bit.ly/23x4NK2 - before attempting to remove dnsmasq-base or kill port 53. Sincerely, Mike On 01/28/2016 10:03 PM, Dean Peterson wrote: > I installed RHEL 7.2 from scratch, then installed Docker and downloaded and > started Openshift 1.1.1. I had been having trouble getting this version to > run reliably. I noticed just recently on startup it was complaining about > port 53 already being bound. I saw that dnsmasq was using the port. I > killed dnsmasq and restarted openshift. Now when I look to see what is > using port 53; openshift is (as I would expect). I am wondering; does RHEL > 7.2 start dnsmasq or does installing the latest version of docker available > to RHEL start it? It seems, Openshift being closely linked to RHEL, this > should be known and mentioned prominently - dnsmasq should be stopped > before starting Openshift. > > > > _______________________________________________ > users mailing list > [email protected] > http://lists.openshift.redhat.com/openshiftmm/listinfo/users > _______________________________________________ users mailing list [email protected] http://lists.openshift.redhat.com/openshiftmm/listinfo/users
