Petr Ruzicka ruzickap

ruzickap / openwrt-wan-ssh.sh

Created May 15, 2026 06:36

OpenWrt WAN access using SSH

	# Set root password
	passwd

	# Enable SSH access from the WAN
	wget https://github.com/ruzickap.keys -O /etc/dropbear/authorized_keys

	cat >> /etc/config/firewall << 'EOF'

	config rule
	option name 'Allow-SSH'

ruzickap / build-openwrt-firmware.sh

Created May 15, 2026 04:01

Build custom OpenWrt sysupgrade firmware via the official Sysupgrade API

	#!/usr/bin/env bash
	# Build custom OpenWrt firmware using the Sysupgrade API
	#
	# Standalone script — no local Ansible code required.
	# Intended for use as a GitHub Gist.
	#
	# Required environment variables:
	# WIFI_SSID — WiFi network name (e.g. "MyNetwork")
	# WIFI_PASSWORD — WiFi password (WPA3/SAE-mixed)
	# PACKAGES — Space-separated list of extra packages to include

ruzickap / gist:eb2ff36be6440526d54c6e04decb8325

Created July 28, 2025 03:33

OpenWRT - Expanding root partition and filesystem - 80-rootfs-resize

	# https://openwrt.org/docs/guide-user/advanced/expand_root

	if [ ! -e /etc/rootfs-resize ] && [ -e /etc/rootpt-resize ] && lock -n /var/lock/root-resize; then
	(
	set -eux
	date
	ROOT_BLK="$(readlink -f /sys/dev/block/"$(awk -e '$9=="/dev/root"{print $3}' /proc/self/mountinfo)")"
	ROOT_DEV="/dev/${ROOT_BLK##*/}"
	LOOP_DEV="$(awk -e '$5=="/overlay"{print $9}' /proc/self/mountinfo)"

ruzickap / 70-rootpt-resize.sh

Created July 28, 2025 03:32

OpenWRT - Expanding root partition and filesystem - 70-rootpt-resize

	# https://openwrt.org/docs/guide-user/advanced/expand_root

	if [ ! -e /etc/rootpt-resize ] && lock -n /var/lock/root-resize; then
	(
	set -eux
	date
	ROOT_BLK="$(readlink -f /sys/dev/block/"$(awk -e '$9=="/dev/root"{print $3}' /proc/self/mountinfo)")"
	ROOT_DISK="/dev/$(basename "${ROOT_BLK%/*}")"
	ROOT_PART="${ROOT_BLK##*[^0-9]}"
	parted -f -s "${ROOT_DISK}" resizepart "${ROOT_PART}" 100%

ruzickap / btrfs_disk_partition.sh

Last active May 18, 2024 04:33

Create BTRFS partition on the HDD SATA disk used for backups

	parted --script /dev/sda mklabel gpt
	parted --script /dev/sda mkpart primary btrfs 0% 100%
	mkfs.btrfs --runtime-features free-space-tree --label My_Disk_2_TB --nodiscard /dev/sda1

	# Entry in /etc/fstab
	# LABEL=My_Disk_2_TB /mnt/usb btrfs noatime,nodiratime,compress=zstd,autodefrag,space_cache=v2

	# Links:
	# * https://wiki.tnonline.net/w/Btrfs/Space_Cache
	# * https://unix.stackexchange.com/questions/53378/how-can-i-script-the-creation-of-a-single-partition-that-uses-the-entire-device

ruzickap / eksctl-calico.sh

Created March 27, 2023 15:39

Deploy Amazon EKS with Calico

	#!/usr/bin/env bash

	export CLUSTER_NAME="ruzickap-calico"
	export AWS_DEFAULT_REGION="eu-central-1"
	export KUBECONFIG="/tmp/kubeconfig-${CLUSTER_NAME}.conf"

	export TAGS="Owner=petr.ruzicka@gmail.com Environment=dev"

	set -euxo pipefail

ruzickap / aks.sh

Created March 15, 2023 07:44

Deploy Azure AKS

	#!/usr/bin/env bash

	export AZURE_LOCATION=westeurope
	export CLUSTER_FQDN="ruzickap2aks.k8s.mylabs.dev"
	# CLUSTER_NAME must have max 12 character due to "--nodepool-name" parameter
	export CLUSTER_NAME="${CLUSTER_FQDN%%.*}"
	export KUBECONFIG="/tmp/kubeconfig-${CLUSTER_NAME}.conf"

	set -euxo pipefail

ruzickap / aks-cilium.sh

Created March 15, 2023 07:41

Deploy Azure AKS with Cilium

	#!/usr/bin/env bash

	export AZURE_LOCATION="westeurope"
	export CLUSTER_FQDN="ruzickap1aks.k8s.mylabs.dev"
	# CLUSTER_NAME must have max 12 character due to "--nodepool-name" parameter
	export CLUSTER_NAME="${CLUSTER_FQDN%%.*}"
	export KUBECONFIG="/tmp/kubeconfig-${CLUSTER_NAME}.conf"

	set -euxo pipefail

ruzickap / eksctl-bottlerocket-karpenter.sh

Last active March 14, 2023 12:39

Create Amazon EKS with Bottlerocket and Karpener

	#!/usr/bin/env bash

	export CLUSTER_NAME="ruzickap3"
	export AWS_DEFAULT_REGION="eu-central-1"
	export KUBECONFIG="/tmp/kubeconfig-${CLUSTER_NAME}.conf"

	export TAGS="Owner=petr.ruzicka@gmail.com Environment=dev"

	set -euxo pipefail

ruzickap / kops-ubuntu.sh

Last active November 25, 2023 09:19

Deploy k8s cluster with Ubuntu nodes using kops

	#!/usr/bin/env bash

	export CLUSTER_FQDN="${CLUSTER_FQDN:-ruzickap-kops-ubuntu.k8s.mylabs.dev}"
	export AWS_DEFAULT_REGION="${AWS_DEFAULT_REGION:-eu-central-1}"
	export KUBECONFIG="/tmp/kubeconfig-${CLUSTER_FQDN}.conf"
	export KOPS_STATE_STORE="s3://${CLUSTER_FQDN}"

	set -euxo pipefail

	## Create S3 bucket first