Andrew Stangl madAndroid

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

	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

	# 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

	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

	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.