dannysauer

# creating a new VG with the second hard disk in the system
sudo virsh pool-define-as default logical - - /dev/sdb libvirt_lvm /dev/libvirt_lvm
sudo virsh pool-build default --overwrite
sudo virsh pool-start default

# as a directory
sauer@helium:~/kubic-project/automation> virsh pool-edit default                
  <pool type='dir'>
    <name>default</name>
    <uuid>fdab5cc0-94a6-4349-892c-1fe133158406</uuid>

dannysauer

To override name resolution, create a mount namespace and bind mount a special resolv.conf over the top of the original. The IP address will be the first address in the range given to the virtual network. I used 192.168.68.0/22, so the DNS server (dnsmasq) is started by KVM on 192.168.68.1. You can "discover" that by getting the information for the network, then looking at the IP address assigned to the bridge device:

sauer@lightning:~> sudo virsh net-list
 Name                 State      Autostart     Persistent
----------------------------------------------------------
 caasp-dev-net        active     no            yes

dannysauer

sauer@lightning:~$ sudo grep 2019-01-24 /var/log/zypp/history | awk -F\| '$2=="install"{print $3,$4,$5}' | sort
alsa-plugins 1.1.8-1.1 x86_64
apparmor-abstractions 2.13.2-3.1 noarch
apparmor-docs 2.13.2-3.1 noarch
apparmor-parser 2.13.2-3.1 x86_64
apparmor-parser-lang 2.13.2-3.1 noarch
apparmor-profiles 2.13.2-3.1 noarch
apparmor-utils 2.13.2-3.1 noarch
apparmor-utils-lang 2.13.2-3.1 noarch
bison 3.2.4-1.1 x86_64

dannysauer

cd /usr/local/src
sudo mkdir netdata && sudo chown --reference=$HOME netdata/
git clone https://github.com/netdata/netdata.git --depth=100
cd netdata

dannysauer

sudo virt-install --name=leap15_dev --vcpus=8 --memory=$((1024*32)) --disk path=/var/lib/libvirt/local/leap15.qcow --os-variant=opensuse15.1 --import

dannysauer

// process arbitrary 1+2-(3+(5-1))-2 style equations
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

int parse(char[]);
int process(int, char, int);
struct State {
    int total;
    char operator;

dannysauer

pipe = 1/2;

bearing_id = 3/8;
bearing_od = 7/8;
bearing_w = 9/32;

// max overlap is 0.50 == 50%
pipe_overlap_multiplier = 0.35;
pulley_od = 3;
pulley_lip = 1/16;

dannysauer

1. Set up a virtual network that uses nat
2. Build machines using that network
3. Figure out what bridge device this network is using (my example is "hundrednet")
   1. virsh net-info hundrednet | grep -i bridge
4. Configure that network to only communicate internally and to the proxy
   1. sudo iptables -L FORWARD --line-numbers --verbose
   2. find the line for this network like 7 66 7322 ACCEPT all -- virbr2 any 192.168.100.0/24 anywhere
   3. replace that line (line 7 in the example) with one that only accepts traffic to the proxy: sudo iptables -R FORWARD 7 -i virbr2 -s 192.168.100.0/24 -p tcp --dport 3128 -j ACCEPT Note that this uses the same input interface (-i), the same source range (-s), and adds TCP protocol and destination port 3128

dannysauer

#!/bin/bash
# usage: clone.sh [source_domain] target_domain [target_domain_2 ...]
# note - if you want to make more than one clone, you must specify the source.
set -o errexit

SRC=sle15sp1
if (( ${#@} > 1 ))
then
  SRC="$1"
  shift

dannysauer

Rather than set up static IPs in VMs, I'd prefer to use DHCP and just have static assignments. This is basically how I do that:

List the interfaces:

for H in $( sudo virsh list --name | grep proxy ); do echo $H; sudo virsh --quiet domiflist --domain $H; done

For each interface's MAC, add a static lease:

sudo virsh net-update proxynet add-last ip-dhcp-host '<host mac="52:54:00:02:e1:aa" ip="192.168.42.10" />' --live --config