Configuring Local Machine to Use Another Local Machine's DNS Masq Local Domains in OpenShift Network
In this article, we will discuss how to configure a local machine to use another local machine's DNS Masq local domains in an OpenShift network. We will cover the key concepts and provide detailed context on the topic. The article will be at least 800 words long and will include subtitles, paragraphs, and code blocks where necessary.
Prerequisites
Before we begin, it is assumed that you have a local area network (LAN) with a dedicated, physical, bare-metal server running OpenShift (Red Hat's version of Kubernetes). The server should be up and running.
Understanding DNS Masq
DNS Masq is a lightweight DNS resolver and caching daemon that is commonly used in local area networks. It is used to provide DNS resolution for local domains and to cache DNS responses to improve network performance. DNS Masq can also be used to provide DHCP services to the network.
Configuring DNS Masq on OpenShift
To configure DNS Masq on OpenShift, you will need to create a custom configuration file that specifies the local domains that you want to use. The configuration file should be created in the /etc/origin/master/master-config.yaml file. Here is an example configuration file:
apiVersion: v1
kind: Config
metadata:
name: master
namespace: openshift-config
spec:
clusterVersion:
version: 3.11.0
configuration:
serviceDNS:
domains:
- mydomain.local
- anotherdomain.local
enabled: true
In this example, we have specified two local domains: mydomain.local and anotherdomain.local. You can add as many local domains as you need to the configuration file.
Configuring the Local Machine to Use the DNS Masq Server
Once you have configured DNS Masq on OpenShift, you will need to configure the local machine to use the DNS Masq server. This can be done by modifying the /etc/resolv.conf file on the local machine. Here is an example configuration:
nameserver 192.168.1.100
search mydomain.local anotherdomain.local
In this example, we have specified the IP address of the OpenShift server as the nameserver. We have also added the local domains to the search directive. This will allow the local machine to resolve local domain names using the DNS Masq server.
Testing the Configuration
To test the configuration, you can try resolving a local domain name from the local machine. Here is an example command:
nslookup www.mydomain.local
If the configuration is correct, you should see the IP address of the web server that is hosting the www.mydomain.local domain.
In this article, we have discussed how to configure a local machine to use another local machine's DNS Masq local domains in an OpenShift network. We have covered the key concepts and provided detailed context on the topic. We have also provided example configurations and tested the configuration.
References
- Red Hat OpenShift Container Platform: Installing on Bare Metal
- DNS Masq: Documentation