Jeffery B.'s Blog

Getting Started with MicroShift on the Mac/Ubuntu and Fedora

I ran across the MicroShift Project, and what I liked about it the most is the System Requirements. To run MicroShift, you need a machine with at least: * a supported 64-bit CPU architecture (amd64/x86_64, arm64, or riscv64) * 2 CPU cores * 2GB of RAM * 1GB of free storage

tips

Use nmcli to connect to OpenVPN Server on Ubuntu Desktop

I was trying to setup my Ubuntu machine to use nmcli to connect to my VPN and I just wanted wanted to document what I did for the next time I try it or for the next person Change netplan renderer from networkd to NetworkManager $ sudo cat /etc/netplan/10-

bash

AWK: read the next line

getline, the function reads the next line and moves the script to it. I wanted to get the current git version number from https://git-scm.com/downloads, and using getline came very handy by running something like this: curl --silent https://git-scm.com/downloads | awk '/span class=

bash

BASH: Provide a default value that the user can change

I wanted to be able to provide a default value that the user can change in a bash script and found this... read -p "Name to deploy as: " -e -i "gitlab-runner" APP echo ${APP} Note that you need -e for -i to work as intended.

bash

AWK - Display all fields except the last

awk 'BEGIN{FS=OFS="-"}{NF--; print}' It's come up a few times where I wanted to get all fields, except for the last one, and I always had to google it, which would take me about 15 min or so to find a good

podman

Install Podman on Ubuntu

Just a quick note on how to get podman working on ubuntu... $ . /etc/os-release $ echo "deb https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/testing/xUbuntu_${VERSION_ID}/ /" | sudo tee /etc/apt/sources.list.d/devel:kubic:libcontainers:testing.list $ curl -L https://download.opensuse.org/repositories/

bash

How do I check if a port is open from a shell script

Sometime I find myself needing to check if a port is open, on a system or container, that doesn't have the usual programs such as, nc or netstat. Luckily, bash have a built in way of checking if a port is open: </dev/tcp/localhost/31339 &

ansible

Inline/Dynamic variable in Ansible playbook

I have an ansible playbook that setups my system and I have some aliases that I like to set, like alias apt-get='sudo apt-get' and alias yum='sudo yum'. Yes, I could create a block for Ubuntu and another for RedHat, but sometimes it&

Force delete OpenShift project/namespace

To delete a project/namespace <namespace>: curl -s https://raw.githubusercontent.com/jefferyb/useful-scripts/master/openshift/force-delete-openshift-project | bash -s -- -n "<namespace>" To delete multiple projects/namespaces (network-diag-global-ns-86drn network-diag-global-ns-x8jfp network-diag-ns-hndp2

KubeVirt on OpenShift

UPDATED: 17 May 2019 A quick HowTo get KubeVirt running on OpenShift. Requirements A few requirements need to be met before you can begin: * OpenShift [https://github.com/openshift/origin]/Kubernetes cluster * oc client utility * git Minimum Cluster Requirements Openshift 3.10 or later is required to run KubeVirt. Virtualization

Ansible: set debconf variables

Sometimes I need to automate some install on Ubuntu using Ansible. To do that, I need to get a list of questions/variables from the app/package. Welcome to debconf-get-selections In this example, we'll use slapd package. $ apt-get install -y debconf-utils # As an example,

openshift

OpenShift: How to access Private GitLab Docker registry

Here's a quick howto, if you want to pull an image from a private repo, for example, registry.gitlab.example.com. PS: You may need to create 2 secrets, using both, registry.gitlab.example.com & gitlab.example.com, for --docker-server ref: https://github.com/openshift/origin/

KVM : Nested KVM

If you want to create virtual machines as nested KVM on KVM host: 1. Enable the setting for Nested KVM. # show the current setting ( if the result is [Y], it's OK ) root@localhost:~# cat /sys/module/kvm_intel/parameters/nested Y # if the result is [N], change like

openshift

Restarting OpenShift master and node services

To apply master or node configuration changes, you must restart the respective services. To reload master configuration changes, restart master services running in control plane static pods using the master-restart command: # master-restart api # master-restart controllers To reload node configuration changes, restart the node service on the node

openshift

OpenShift CLI: Create a new app

Let's say you're working on a NodeJS app locally and want to test/deploy your app in openshift. # Login to openshift oc login https://console.example.com:8443 # Create a new project oc new-project name-of-project --display-name="Name of the project"

openshift

OpenShift CLI: Import environment from a secret

A quick howto to import environment from a secret using the CLI. The YAML way Create a secret.yaml file apiVersion: v1 kind: Secret metadata: name: test-secret data: username: bXktYXBw password: Mzk1MjgkdmRnN0pi and then use valueFrom: secretKeyRef to get the value. apiVersion: v1 kind: Pod metadata: name: secret-envars-

openshift

Openshift: Using BuildConfig with a private git repo with a Dockerfile

Let's look at how to use BuildConfig with a private git repo with a Dockerfile. I'll be using gitlab private repo as an example. Let's say I have a DeploymentConfig (see below) that's pulling an from dockerhub, but I want to use

openshift

Openshift/kubernetes: Getting pod names

If you want to get the names of the pod in Openshift/Kubernetes, do # Using custom-columns $ oc get pods --no-headers -o custom-columns=":metadata.name" admin-1-dbxxq client-1-wpfh7 server-1-qhcwn database-1-cw64z # Using json $ oc get pod -o jsonpath='{range

openshift

Openshift/kubernetes: field selectors

Sometimes, I just want to see the pods where status=failed or status=running and that's where --field-selector comes in handy. > --field-selector='': Selector (field query) to filter on, supports '=', '==', and '!='.(e.g. --field-selector key1=value1,key2=

openshift

Openshift: NFS-Client Provisioner

This is a quick start guide on how to deploy an NFS Client Provisioner in your openshift cluster. If you would like a more detailed info/walkthrough, please visit https://github.com/kubernetes-incubator/external-storage/tree/master/nfs-client PS: This assumes you already have an NFS Server. ### Collect

ansible

Ansible: check_mode

One of those cool tricks: Checking if string exists in file and then decide whether to run a command or not - name: Check if ldap.example.com is configured lineinfile: dest: /etc/openldap/ldap.conf line: "URI ldap://ldap.example.com/" check_mode: yes register: presence # failed_when:

openshift

OpenShift all-in-one cluster

If you'd like to try out OpenShift, you can set up OpenShift cluster with the oc cluster up. This only works with OpenShift version 3.x In short on Linux: 1. Install Docker with your platform's package manager. 2. Configure the Docker daemon with an insecure