rbtr

kubectl get nodes --sort-by=".status.conditions[?(@.reason == 'KubeletReady' )].lastTransitionTime"

so0k

Kubectl output options

Let's look at some basic kubectl output options.

Our intention is to list nodes (with their AWS InstanceId) and Pods (sorted by node).

We can start with:

kubectl get no

efrecon

docker run \
  --name {{printf "%q" .Name}} \
    {{- with .HostConfig}}
        {{- if .Privileged}}
  --privileged \
        {{- end}}
        {{- if .AutoRemove}}
  --rm \
        {{- end}}
        {{- if .Runtime}}

amokan

build
  Builds a job, and optionally waits until its completion.
cancel-quiet-down
  Cancel the effect of the "quiet-down" command.
clear-queue
  Clears the build queue
connect-node
  Reconnect to a node
copy-job
  Copies a job.

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

joemiller

#!/usr/bin/env ruby
require 'em-http-request'
require 'json'

servers = ["mysql01", "rabbitmq01", 
           "riak01", "api01", "web01", 
           "widgets01", "app01", "app02"]
pending = servers.length

EM.run {

mklnz

# I got tired of uploading to /tmp then moving to the correct location, so these two convenience methods will save you a lot of time in the long run.

# Helper method to upload to /tmp then use sudo to move to correct location.
def put_sudo(data, to)
  filename = File.basename(to)
  to_directory = File.dirname(to)
  put data, "/tmp/#{filename}"
  run "#{sudo} mv /tmp/#{filename} #{to_directory}"
end

gorsuch

require 'base64'
require 'digest/md5'

key = "your public key here"

# first decode the key
key_decoded = Base64.decode64(key)
# create an md5
md5 = Digest::MD5.hexdigest(key_decoded)
# convert that hash into a readable fingerprint