Category: Linux

If you want to develop something for kubernetes, you may need to run minikube. This can be done on our linux installations, the following commands should start a working “kubernetes cluster” on your installation:

mkdir ~/bin/

wget https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64 -O ~/bin/minikube
chmod 755 ~/bin/minikube

cd ~/bin/
./minikube config set rootless true
./minikube config set driver podman
./minikube config set container-runtime containerd

./minikube start --cni calico

After minikube has started you can check all running pods with the following:

minikube kubectl -- get pods -A

You can also install kubectl and helm in your ~/bin if you like:

cd ~/bin/

curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"

export HELM_INSTALL_DIR=~/bin; export USE_SUDO=false; curl https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3 | bash

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Posted on 31-Oct-2023 by ISG D-MATH

This describes how to create a local folder in which you can move emails, which will still be available in the evolution mail client. So the mails will be removed from the mailserver and saved into a folder, which you have to backup.

Requirements:

• You already use evolution as your mail client
• You make backups of your local files and folders

First create a folder in the filesystem, which will hold your mails:

Now open evolution and start adding a new mail account:

This account will be your local archive, so you can give it a meaningfull name, ex. “Local Archive”. As for the email address you can type in a non existing one, i suggest “archive@local”, this names will help to identify it in evolution later:

After hitting “Next” choose “Standard Unix mbox spool directory” as Server type:

For the “Spool Directory” choose the folder you have created above:

On the next page activate the following:

Choose “None” as the “Server Type”:

“Next” it will ask you for the name which will appear in evolution:

Now you have the new account:

You need to create a folder now to put your mails into:

For example you can create a new one each year:

Now you can move mails from your account into this folder, they will be saved on your filesystem, so don’t forget to regulary make a backup.

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Posted on 17-May-2023 by ISG D-MATH

To use docker at D-MATH is to use podman -> https://podman.io/

With podman you can use all docker commands just write podman instead of docker in the command, all the parameter stay the same.

With podman we are able to provide a possibility that a user without administrative rights can download and run docker images.

Example 1

The following example will run the latest docker image of alpine linux (https://hub.docker.com/_/alpine).

podman run -ti -v $(pwd):/home/test alpine:latest

The parameter

• -v $(pwd):/home/test

is very helpful, this will add the current folder you are in now, to the container at /home/test. If you have seLinux activated you need to add a Z:

• -v $(pwd):/home/test:Z

Example 2

The following example shows howto run a more complicated docker image named fenics and transfer files.

First open a terminal and go into the folder which you want to have accessable in the docker image.

mkdir -p ~/Documents/mydata
cd ~/Documents/mydata

Now run the container with the following parameters:

podman run -ti -p 127.0.0.1:8000:8000 -v $(pwd):/home/fenics/shared -w /home/fenics/shared quay.io/fenicsproject/stable:current

This will connect you to the container.

But the docker image of the fenicsproject will log you in a user fenics, this user will not have access to the data in ~/Documents/mydata.

With podman the user root in the container will have access to your files.

So you need to become root inside the container to have access:

sudo su -

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Posted on 17-May-2023 by ISG D-MATH

With Environment Modules or simply called Modules it is possible to dynamically expand the active user environment and to remove it again without closing the shell.

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Posted on 17-May-2023 by ISG D-MATH,

On our Linux devices we are providing a Python Tensorflow Module ready to use that is accessible trough a Linux Environment Module. With the command “module” you have the possibility to add Tensorflow in many different versions. By default the newest is chosen. Read more

Posted on 17-May-2023 by ISG D-MATH, 2 Comments