The required setup instructions can be seen at:

https://github.com/openshift/origin/blob/master/docs/cluster_up_down.md#linux 
<https://github.com/openshift/origin/blob/master/docs/cluster_up_down.md#linux>

It describes what you need to do with the firewall.

> On 13 Nov 2017, at 7:35 am, Marc Boorshtein <[email protected]> wrote:
> 
> is your machine (the centos7 vm) running dnsmasq or anything else on port 53? 
>  If so, shut it down prior to bringing up your cluster.
> 
> 
> Nothing is running on 53:
> tcp        0      0 localhost:10443         0.0.0.0:*               LISTEN    
>  
> tcp        0      0 localhost:10444         0.0.0.0:*               LISTEN    
>  
> tcp        0      0 0.0.0.0:http            0.0.0.0:*               LISTEN    
>  
> tcp        0      0 0.0.0.0:senomix02       0.0.0.0:*               LISTEN    
>  
> tcp        0      0 0.0.0.0:ssh             0.0.0.0:*               LISTEN    
>  
> tcp        0      0 localhost:smtp          0.0.0.0:*               LISTEN    
>  
> tcp        0      0 0.0.0.0:https           0.0.0.0:*               LISTEN    
>  
> tcp        0      0 0.0.0.0:pcsync-https    0.0.0.0:*               LISTEN    
>  
> tcp6       0      0 [::]:jetcmeserver       [::]:*                  LISTEN    
>  
> tcp6       0      0 [::]:ssh                [::]:*                  LISTEN    
>  
> tcp6       0      0 [::]:afs3-callback      [::]:*                  LISTEN    
>  
> tcp6       0      0 localhost:smtp          [::]:*                  LISTEN    
>  
> tcp6       0      0 [::]:newoak             [::]:*                  LISTEN    
>  
> tcp6       0      0 [::]:10250              [::]:*                  LISTEN    
>  
> udp        0      0 0.0.0.0:64109 <http://0.0.0.0:64109/>           0.0.0.0:* 
>                          
> udp        0      0 0.0.0.0:20230 <http://0.0.0.0:20230/>           0.0.0.0:* 
>                          
> udp        0      0 0.0.0.0:senomix02       0.0.0.0:*                         
>  
> udp        0      0 0.0.0.0:bootpc          0.0.0.0:*                         
>  
> udp        0      0 0.0.0.0:bootpc          0.0.0.0:*                         
>  
> udp        0      0 localhost:323           0.0.0.0:*                         
>  
> udp6       0      0 [::]:64109              [::]:*                            
>  
> udp6       0      0 [::]:15385              [::]:*                            
>  
> udp6       0      0 localhost:323           [::]:*                            
>  
> raw6       0      0 [::]:ipv6-icmp          [::]:*                  7         
>  
> raw6       0      0 [::]:ipv6-icmp          [::]:* 
> 
> Firewalld is running...should I add an open up 53?
> 
>  
> what the master container can resolve is not relevant, but if you want to 
> diagnose things further, start a different pod (like the jenkins pod) and rsh 
> into that pod and see
> 1) whether it can resolve hosts
> 2) what its /etc/resolv.conf value is
> 3) whether it has external connectivity (independent of its ability to 
> resolve hostnames)
> 
> I did fire up another container and it can't resolve service DNS names
> 
>  
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