This is a small script to patch a MicroK8s deployment with activated container registry add-on to accept the external facing IP address of the host as a valid insecure registry target.

microk8s-patch-insecure-registries.sh

#!/bin/bash

# To use Skaffold and other tools for k8s development, the external IP should consistently be used when refferring to an image in a private registry.
# To be able to do this in MicroK8s, one need to add the external IP to the accepted insecure registries
# See https://microk8s.io/docs/registry-private
#
# This script does automatic patching for this usecase.
#
# Apply directly from Guthub Gist on the MicroK8s host:
# source <(curl https://gist.githubusercontent.com/rgielen/3a5044c3f82690c5ae8caee04ff31ea6/raw/d5ba473f8de7282827da5bca224143d619834ce2/microk8s-patch-insecure-registries.sh)
# 
# For Mac / Windows you must enter the MicroK8s VM first, e.g. multipass exec microk8s-vm bash

MYIP=$(hostname -I | awk '{print $1}')

sudo patch -b /var/snap/microk8s/current/args/containerd-template.toml <<EOF 
--- containerd-template-original.toml	2020-10-02 11:21:15.091385322 +0200
+++ containerd-template.toml	2020-10-02 11:20:50.693904699 +0200
@@ -76,3 +76,6 @@
         endpoint = ["https://registry-1.docker.io", ]
       [plugins."io.containerd.grpc.v1.cri".registry.mirrors."localhost:32000"]
         endpoint = ["http://localhost:32000"]
+      [plugins."io.containerd.grpc.v1.cri".registry.mirrors."${MYIP}:32000"]
+          endpoint = ["http://${MYIP}:32000"]
+
EOF

sudo microk8s stop
sudo microk8s start