janetkuo

There are three easy to make mistakes in go. I present them here in the way they are often found in the wild, not in the way that is easiest to understand.

All three of these mistakes have been made in Kubernetes code, getting past code review at least once each that I know of.

1. Loop variables are scoped outside the loop.

What do these lines do? Make predictions and then scroll down.

func print(pi *int) { fmt.Println(*pi) }

janetkuo

Please comment below if you are using Kubernetes Third-Party Resources and I will add you to the list.

Known Users:

• Rook Operator: https://github.com/rook/rook/tree/master/demo/kubernetes
• Elasticsearch Operator: https://github.com/upmc-enterprises/elasticsearch-operator
• Etcd Operator: https://coreos.com/blog/introducing-the-etcd-operator.html
• Prometheus Operator: https://coreos.com/blog/the-prometheus-operator.html
• CoreOS Tectonic: https://coreos.com/tectonic
• Kelsey Hightower's kube-cert-manager: https://github.com/kelseyhightower/kube-cert-manager

janetkuo

[credential]
	helper = cache --timeout=99999999999999999
[user]
	name = Firstname Lastname
	email = username@myEmail.com
[alias]
        lol = log --graph --decorate --pretty=oneline --abbrev-commit --all
	glog = log --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset'
	log-file = log --follow --color -- 
	co = checkout

janetkuo

#  ---------------------------------------------------------------------------
#
#  Description:  This file holds all my BASH configurations and aliases
#
#  Sections:
#  1.   Environment Configuration
#  2.   Make Terminal Better (remapping defaults and adding functionality)
#  3.   File and Folder Management
#  4.   Searching
#  5.   Process Management

janetkuo

$ git config --global --add alias.lol "log --graph --decorate --pretty=oneline --abbrev-commit --all"
$ git lol
* 9f0349d (HEAD, origin/master, origin/HEAD, master) Now finally does frickin pull first.
* 1cc98b0 Added auto-update.
* 405970a Initial import.

janetkuo

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

janetkuo

How to build statically linked release binary

Check if a binary is statically linked

# List dynamic dependencies (shared libraries):
# 1. if it's dynamically linked, you'll see
$ ldd kompose 
    linux-vdso.so.1 =>  (0x00007ffe937ea000)
 libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f0a7dae5000)

janetkuo

# Replace <> with real values 
$ kubectl create secret generic kubebot --from-literal=token=<your-bot-token> --from-literal=channel=<channel-id>

janetkuo

apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: kubebot
  labels:
    component: kubebot
spec:
  replicas: 1
  template:
    metadata:

janetkuo

package main

import (
	"fmt"
	"net/http"
)

// hello world, the web server
func HelloServer(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintf(w, "Hello, world!")