Install Shutter in Arch Linux

It’s quite unexpected that in Arch Linux’s package database I couldn’t find Shutter, which is generally available in other Linux distributions. Although, it’s still possible to install Shutter in Arch.

First I use pacaur as my AUR helper. Installation of pacaur can refer to this. Then it’s quite easy to get Shutter installed because it’s in AUR already(thanks heaps).

pacaur -S perl-goo-canvas shutter

The package perl-goo-canvas is needed when I want to edit screenshots, eg. adding text, etc…

🙂

Kubernetes Tips: ConfigMap

This is how to update a config map with 1 line:

kubectl create configmap foo --from-file foo.properties -o yaml --dry-run | kubectl replace -f -

I found it here: https://stackoverflow.com/questions/38216278/update-k8s-configmap-or-secret-without-deleting-the-existing-one

And this is how to mount a config map created from a file as file(not super intuitive but a config map can only be mounted as a volume, and the mount point has to be a directory):

containers:
- volumeMounts:
 - name: demo-config
 mountPath: /app/settings.json
 subPath: settings.json
volumes:
- name: demo-config
 configMap:
 name: demo

I think this is because when creating a config map from a file, the file name becomes the key and the content becomes the value. A config map can have multiple key-value pairs just like a directory can have more than 1 file. So by using the subPath the key will be mounted as a file.

Found it here: https://github.com/kubernetes/kubernetes/issues/44815#issuecomment-297077509

🙂

Gotcha AWS NAT instance

It’s quite straight forward when creating an NAT instance for a private subnet in AWS, eg. search for amzn-ami-vpc-nat-hvm for the AMI then launch it into a public subnet.

However I need to disable source/destination check before the NAT instance becomes available in the drop down list of destinations of a route table:

🙂