pydevops

HTTP tunnel

• https://en.wikipedia.org/wiki/HTTP_tunnel

On prem k8s cluster set up with bastion vm

1. Create a bastion vm in your data center or in cloud with connectivity set up (usually vpn) to the on prem data center.
2. Install tinyproxy on the bastion vm and pick a random port as it would be too easy for spam bot with default 8888, set up as systemd service according to https://nxnjz.net/2019/10/how-to-setup-a-simple-proxy-server-with-tinyproxy-debian-10-buster/. Make sure it works by validating with curl --proxy http://127.0.0.1:<tinyproxy-port> https://httpbin.org/ip. And I don't use any user authentication for proxy, so I locked down the firewall rules with my laptop IP/32.
3. Download the kubeconfig file for the k8s cluster to your laptop
4. From your laptop, run

HTTPS_PROXY=<bastion-external-ip>:<tinyproxy-port> KUBECONFIG=my-kubeconfig kubectl get nodes

bojand

Just documenting docs, articles, and discussion related to gRPC and load balancing.

https://github.com/grpc/grpc/blob/master/doc/load-balancing.md

Seems gRPC prefers thin client-side load balancing where a client gets a list of connected clients and a load balancing policy from a "load balancer" and then performs client-side load balancing based on the information. However, this could be useful for traditional load banaling approaches in clound deployments.

https://groups.google.com/forum/#!topic/grpc-io/8s7UHY_Q1po

gRPC "works" in AWS. That is, you can run gRPC services on EC2 nodes and have them connect to other nodes, and everything is fine. If you are using AWS for easy access to hardware then all is fine. What doesn't work is ELB (aka CLB), and ALBs. Neither of these support HTTP/2 (h2c) in a way that gRPC needs.

LindaLawton

# Tutorial https://www.daimto.com/how-to-get-a-google-access-token-with-curl/
# YouTube video https://youtu.be/hBC_tVJIx5w
# Client id from Google Developer console
# Client Secret from Google Developer console
# Scope this is a space seprated list of the scopes of access you are requesting.

# Authorization link.  Place this in a browser and copy the code that is returned after you accept the scopes.
https://accounts.google.com/o/oauth2/auth?client_id=[Application Client Id]&redirect_uri=http://127.0.0.1&scope=[Scopes]&response_type=code

# Exchange Authorization code for an access token and a refresh token.

yossorion

What I Wish I'd Known About Equity Before Joining A Unicorn

Disclaimer: This piece is written anonymously. The names of a few particular companies are mentioned, but as common examples only.

This is a short write-up on things that I wish I'd known and considered before joining a private company (aka startup, aka unicorn in some cases). I'm not trying to make the case that you should never join a private company, but the power imbalance between founder and employee is extreme, and that potential candidates would

rwjblue

• Data Down / Actions Up

  • http://emberjs.jsbin.com/nayaho/edit?html,js - Interdependent select boxes. No observers.
  • http://ember-twiddle.com/2d7246875098d0dbb4a4 - One Way Input

• Plain JSBin's

  • http://rwjblue.jsbin.com/pixeki/edit?html,js,output

• Ember Version Base JSBin's

  • 1.0 - http://emberjs.jsbin.com/juluje/edit?html,js,output

• 1.1 - http://emberjs.jsbin.com/cofufo/edit?html,js,output

vdel26

#!/bin/sh
#
# chkconfig: 2345 55 25
# Description: Nginx init.d script, put in /etc/init.d, chmod +x /etc/init.d/nginx
#              For Debian, run: update-rc.d -f nginx defaults
#              For CentOS, run: chkconfig --add nginx
#
### BEGIN INIT INFO
# Provides:          nginx
# Required-Start:    $all

MohamedAlaa

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD