jarno / motd-dynamic

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Dynamic motd

1	#!/bin/bash
2
3	# Dynamic MOTD generator
4
5	USER=`whoami`
6	HOSTNAME=`uname -n`
7	NET_IF='eth0'
8	IP4=`ip a show $NET_IF \| grep 'inet ' \| awk '{print $2}'i \| tr -d '\n'`
9	IP6=`ip a show $NET_IF \| grep 'inet6 ' \| head -1 \| awk '{print $2}' \| tr -d '\n'`
10	ROOT_USED=`df -Ph \| grep ' /$' \| awk '{print $3}' \| tr -d '\n'`

jarno / install_git.sh

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CentOS 7 newer Git

1	#!/bin/bash
2	sudo yum -y remove git git-*
3	sudo yum -y install https://packages.endpointdev.com/rhel/7/os/x86_64/endpoint-repo.x86_64.rpm
4	sudo yum -y install git

jarno / port_forward

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Port forward wrapper for firewalld

1	#!/bin/bash
2
3	if [[ "$1" == "stop" ]]; then
4	printf "Reloading firewall.. "
5	firewall-cmd --reload
6	exit $?
7	fi
8
9	function usage () {
10	printf "\nUsage:

jarno / guest_disk_resize.md

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Resize VM disk

How to resize a guest VM disk
Resize the virtual disk image

On Proxmox: qm resize <vmid> <disk id> <new size>
e.g. qm resize 132 scsi0 100G will set the disk image size to 100G
On modern Linux guests (kernel >3.6) no need to reboot the guest


Steps inside the guest

for LVM:
Grow the partition:
fdisk 

jarno / cleanup.sh

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VM template cleanup

1	#!/bin/sh -eux
2
3	## VM cleanup script for generating templates
4	##
5	## Download from https://gist.githubusercontent.com/0ranki/a2fb607c41a4112c410befc9be004646/raw/e7f2ce00636170416c2f65b63196358320166624/cleanup.sh
6
7	major_version="`sed 's/^.\+ release $[.0-9]\+$.*/\1/' /etc/redhat-release \| awk -F. '{print $1}'`";
8
9	# make sure we use dnf on EL 8+
10	if [ "$major_version" -ge 8 ]; then

jarno / tar-over-ssh.md

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Copy to remote with SSH & tar

tar -hc src/ | ssh target.machine 'tar -xC /path/to/remote'

will create /path/to/remote/src/ on the target machine with symlinks replaced by their targers

jarno / devcontainer.json

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VS Code with rootless podman

1	// ...
2	"remoteUser": "xxx",
3	"containerUser": "xxx",
4	"workspaceMount": "source=${localWorkspaceFolder},target=/workspace,type=bind,Z",
5	"workspaceFolder": "/workspace",
6	"runArgs": ["--userns=keep-id"]
7
8	// For rootless podman, root inside container:
9	"workspaceMount": "source=${localWorkspaceFolder},target=/workspace,type=bind,Z",
10	"workspaceFolder": "/workspace"

jarno / kube-reset.sh

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Kubernetes reset

1	yes \| kubeadm reset
2	systemctl stop kubelet crio
3	rm -rf /var/lib/cni/ /var/lib/kubelet/* /etc/cni/
4	nmcli conn down cni0
5	ip link del cni0
6	nmcli conn down flannel.1
7	ip link del flannel.1
8	systemctl start kubelet crio

jarno / kubeadm-init.sh

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Kubernetes init

1	swapoff /dev/xxx
2	# disable in /etc/fstab also
3	systemctl mask --now firewalld
4	echo br_netfilter >> /etc/modules-load.d/kubernetes.conf
5	modprobe br_netfilter
6	sysctl -w net.ipv4.ip_forwarding=1 \| tee -a /etc/sysctl.conf
7	sysctl -w net.bridge.bridge-nf-call-iptables=1 \| tee -a /etc/sysctl.conf
8	sysctl -w net.bridge.bridge-nf-call-ip6tables=1 \| tee -a /etc/sysctl.conf
9
10	cat <<EOF \| sudo tee /etc/yum.repos.d/kubernetes.repo

jarno / gpio_shutdown.md

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RPi GPIO shutdown

Source: https://github.com/CoolerMasterTechnology/Pi-Tool/issues/7#issuecomment-834979824

FWIW, if all you want is for the shutdown button to work, this application is completely unnecessary. The button is on the standard/default shutdown pin, GPIO 3, so all you have to do is add this to your /boot/config.txt:

Enable shutdown button on GPIO 3

dtoverlay=gpio-shutdown

If you'd prefer to set the defaults explicitly:

Enable shutdown button on GPIO 3