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Session 1: Preliminaries

  • Bid/ask spread
    • Stock quotes
    • Measure of liquidity
    • Steady state (order book, market depth, types of orders)
    • How prices move
  • Market makers
    • NYSE vs NASDAQ vs crypto
  • Advantages given in exchange for risk
briangordon / chrome.json
Created Feb 2, 2020
Jess Frazelle's Google Chrome seccomp profile combined with the default docker profile
View chrome.json
"defaultAction": "SCMP_ACT_ERRNO",
"syscalls": [
"name": "accept",
"action": "SCMP_ACT_ALLOW",
"args": null
"name": "accept4",
briangordon / ludi-nginx.conf
Last active Mar 11, 2021
My personal nginx configuration for sharing files
View ludi-nginx.conf
user www-data;
worker_processes auto;
pid /run/;
include /etc/nginx/modules-enabled/*.conf;
events {
worker_connections 768;
# multi_accept on;
# Mine. Probably not necessary but why not
briangordon /
Last active Mar 11, 2021
ddclient for Cloudflare DNS / DO

This is a ddclient setup for updating Cloudflare DNS from a DO droplet.

You do get one free floating IP which makes dynamic DNS pointless, but you'll get charged if you want to turn off the droplet. Running ddclient lets you keep using Cloudflare DNS without manually updating your A records.

Debian Buster (current stable) only has ddclient 3.8.3 which has trouble with the v4 Cloudflare API, so we get ddclient from GitHub.

apt install perl libdata-validate-ip-perl libjson-any-perl
tar xzf ddclient-3.9.1.tar.gz
cp ddclient/ddclient /usr/sbin/
briangordon / office-privacy.reg
Created May 27, 2019
Microsoft recently introduced "required" telemetry for Office which cannot be disabled through the UI. This should shut it off.
View office-privacy.reg
Windows Registry Editor Version 5.00

These are the configuration files I ended up using for setting up a Wireguard-based anonymizing VPN on Debian Buster (the current stable), formatted as a shell script. It requires the Wireguard kernel module and userland tools from backports: apt-get install -t buster-backports wireguard-tools

The idea here is to set up a network namespace containing the configuration for the wireguard interface wg0. Any program which wants to use the Wireguard interface needs to be run in that namespace. For example, ip netns exec wireguard ping All sockets opened by that program and its children will go out over the tunnel, including DNS resolution, so they won't be able to interact in any way with the local network. Conversely, other processes (which were not started with ip-netns) will continue to use the original routing tables and DNS configuration, so things like SSH, remote desktop, and NFS

briangordon / gist:d6014bc1b96f6d89a51ce7906cea9a03
Created Nov 16, 2018
Dtrace one-liner for watching readers of your chrome profile
View gist:d6014bc1b96f6d89a51ce7906cea9a03
dtrace -n 'syscall::open*:entry /strstr(copyinstr(arg0), "Chrome/Default") != NULL/ { printf("%s %s",execname,copyinstr(arg0)); }' > chrome-accessors
# UFW configuration for a home DMZ box exposed to the public internet, with only sshd reachable from the outside world.
# In addition to setting these rules you should also:
# 1. Edit /etc/ufw/before.rules to remove the default rules which permit incoming DHCP packets from the outside world.
# 2. Edit /etc/ufw/before.rules to remove the default rules which permit incoming ICMP packets from the outside world.
# 3. Edit /etc/default/ufw to turn off non-local ipv6 because I don't know enough about it to be confident.
ufw default deny incoming
ufw default allow outgoing
ufw limit log proto tcp to port ssh
ufw allow proto udp from to port bootpc comment "required for dhclient"
briangordon / cisco-sg350 switch1
Last active May 2, 2020
Switch configuration
View cisco-sg350 switch1
v2.5.0.90 / RTESLA2.5_930_364_105
CLI v1.0
file SSD indicator encrypted
ssd config
ssd file passphrase control unrestricted
no ssd file integrity control
briangordon / animal-verbs.txt
Last active Oct 7, 2019
Animal names which are also verbs
View animal-verbs.txt
Ape his behaviors
Badger her about
Bat your eyelids
Bear fruit
Buck the system
Buffalo him into
Bug him about
Carp about
Chicken out
Clam up