The dig utility is convenient for doing manual DNS resolution from your system. Additionally, it uses the same OS resolver libraries as your applications which makes it more accurate than nslookup for emulating application issues and its output is more suitable for machine parsing. # ensure ‘dig’ is installed sudo apt install -y bind9-dnsutils dig … Bash: using dig for reverse DNS lookup by IP
For troubleshooting DNS issues, running the dig utility directly from OpenWrt can be essential. This is easily done by installing the ‘bind-dig’ package as shown below. opkg update opkg install bind-dig
The default setting for pod DNS resolution has CoreDNS use the settings from the underlying OS of the worker node. If your Kubernetes VMs are joined to multiple networks or search domains, this can cause unexpected results as well as performance issues. If you are using K3s, you can provide an independent resolv.conf file for … Kubernetes: independent resolv.conf for CoreDNS with K3s
The default setting for pod DNS resolution has CoreDNS use the settings from the underlying OS of the worker node. If your Kubernetes VMs are joined to multiple networks or search domains, this can cause unexpected results as well as performance issues. If you are using kubeadm, you can provide an independent resolv.conf file for … Kubernetes: independent resolv.conf for CoreDNS with kubeadm
Ansible has support for generating self-signed certificates as well as certificates using a custom root CA (certificate authority). This is possible using the community.crypto collection. I’ve put this into a role named ansible-role-cert-with-ca available on github, and it can be used from a playbook like below: vars: # custom CA, leaving undefined will create self-signed … Ansible: creating SAN certificates with a custom root CA
On Linux host servers, libvirt uses a separate instance of dnsmasq for each virtual network. So if you want full name and reverse lookup for KVM guests on the default 192.168.122.0 network, you can configure this particular dnsmasq instance using virsh. The ability to customize the libvirt instances are limited, however, so if you need … KVM: Using dnsmasq for libvirt DNS resolution