System

Sensorsd - UPS Shutdown

Shutdown Hosts on Power Outages Everybody is talking about Power Outages. Let’s assume you have a Smart-UPS for your Playground and you’d like to shut some Infrastructure to avoid some troubles with corrupt filesystems, broken vm’s and things like that. Connection UPS to APU via USB Cable dmesg show the UPS connected APU# dmesg uhidev0 at uhub0 port 3 configuration 1 interface 0 "American Power Conversion Smart-UPS_1500 ... uhidev0: iclass 3/0, 142 report ids upd0 at uhidev0 uhid0 at uhidev0 reportid 1: input=0, output=0, feature=1 uhid1 at uhidev0 reportid 2: input=0, output=0, feature=1 .

JC - JSON from CLI

how to build json from cli we all like json, do we ? https://kellyjonbrazil.github.io/jc/docs/parsers/ping add package doas pkg_add jc try ping openbsd-box # ping -c 3 1.1.1.1 |jc --ping -p 2>/dev/null { "destination_ip": "1.1.1.1", "data_bytes": 56, "pattern": null, "destination": "1.1.1.1", "packets_transmitted": 3, "packets_received": 3, "packet_loss_percent": 0.0, "duplicates": 0, "round_trip_ms_min": 9.219, "round_trip_ms_avg": 9.826, "round_trip_ms_max": 10.158, "round_trip_ms_stddev": 0.43, "responses": [ { "type": "reply", "bytes": 64, "response_ip": "1.1.1.1", "icmp_seq": 0, "ttl": 59, "time_ms": 10.

Ubuntu 20.04 LTS & Netplan

Assume you got a fresh Machine with DHCP … Ubuntu with DHCP Config cat /etc/netplan/01-netcfg.yaml # This is the network config written by 'subiquity' network: ethernets: ens192: dhcp4: true version: 2 and you’d like to switch to Static IP, ask google how todo it an give try: Static IP with Netplan # This is the network config written by 'subiquity' network: version: 2 ethernets: ens192: addresses: - 1.2.3.4/24 gateway4: 1.1.1.1 nameservers: addresses: - 8.

FreeBSD bhyve

bhyve, pronounced “beehive” is a hypervisor/virtual machine manager for FreeBSD that supports most Intel and AMD processors that report the “POPCNT” (POPulation Count) processor feature in dmesg(8). Download ISO and boot it … in a new Virtual Machine … cat << 'EOF' > run_bhyve.sh #!/usr/bin/env bash iso=FreeBSD-13.1-RELEASE-amd64-bootonly.iso vm=guest.img # Load Module if needed kldstat |grep vmm.ko || kldload vmm ifconfig tap0 create sysctl net.link.tap.up_on_open=1 ifconfig ifconfig bridge0 create ifconfig bridge0 addm vmx0 addm tap0 ifconfig bridge0 create ifconfig bridge0 up # Get ISO test -f $iso || fetch https://download.

OpenBSD Compile Custom Kernel

Let’s Compile a Custom Kernel for OpenBSD … and let’s check if we can tune the Process it with multiple Processors. get Sources and prepare Custom Kernel cd /usr/src ftp https://cdn.openbsd.org/pub/OpenBSD/$(uname -r)/sys.tar.gz tar xfz sys.tar.gz rm xfz sys.tar.gz cd /sys/arch/$(uname -m)/conf cp GENERIC.MP CUSTOM.MP config CUSTOM.MP cd ../compile/CUSTOM.MP -> with config CUSTOM.MP, you can enable disable Components which will be built into your Custom Kernel. Wlan Drives for a VirtualServer, as example, does not make sense.

FreeBSD - Upgrade 13.0 to 13.1

Upgrade FreeBSD 13.0 to 13.1 should be a easy task, right ? https://www.freebsd.org/releases/13.1R/installation/ https://www.freebsd.org/releases/13.1R/relnotes/ Patch it first freebsd-update fetch freebsd-update install reboot may not needed, but you have to boot anyway a few times … Fetch and Upgrade to 13.1 this needs some time ! depending on your internet speed, and specially to power and filesystem performance of your machine. 20-30min for a common VM is not unreal :( time freebsd-update upgrade -r 13.

Bootstrap Debian

Bootstrapping Debian a little helper how to generate a Debian Template. This time, it’s a VM Hosted on Vultr New VM 1 CPU, 1GB RAM, 25GB Disk upload debian-10.9.0-amd64-netinst.iso boot from iso install: (text based) lang: english country: switzerland locale: US (en_US.UTF-8) keymap: Swiss German nic: ens3 hostname: template-25G domain: noflow.ch passwd: xxxxxx user: prename name / login passwd: xxxxxx disk: Guided - entire disk with LVM - (one partition | separate /home | separate /home, /var and /tmp) separate partition for large disks one partition for smaller disks write: yes disk: 20GB (for guided partitioning), 5GB for Spare write: yes another dvd: no mirror: switzerland, debian.

Bootstrap OpenBSD with Jail Partition

Bootstrapping VM This is similar to the previous Post, but with a small difference. Here, we add an other Partition /jail with 2GB Size. On this Partition, we remove the nodev & nosuid Flag, so we can use this Partition as Root for some Jailed Users. And last but not least, we fireup a new VM, configure a Jailed User and make it Public Available … VM with 20G Disk *** Bootstrap OpenBSD 6.

Bootstrap OpenBSD

Bootstrapping VM It’s always good to have Templates. Isn’t it ? Sometime, with a lot of stuff preconfigured and installed. Sometimes, a fresh install without anything (except syspatches). Here a little Helper, how to Build a OpenBSD Template with 20GB, resp. 40GB Disk Size. This stuff was tested on www.hetzner.de, so you should be able to reproduce it in a few minutes. Costs: CX11, 1 CPU, 2 GB RAM, 20 GB Disk, 20TB Traffic -> 2.