teddyking

2019-06-03T07:25:07.643Z	INFO	crossplane	Adding schemes
2019-06-03T07:25:07.645Z	INFO	crossplane	Adding controllers
2019-06-03T07:25:07.646Z	INFO	kubebuilder.controller	Starting EventSource	{"controller": "replicationgroup.cache.aws.crossplane.io", "source": "kind source: /, Kind="}
2019-06-03T07:25:07.838Z	INFO	kubebuilder.controller	Starting EventSource	{"controller": "eks.compute.aws.crossplane.io", "source": "kind source: /, Kind="}
2019-06-03T07:25:07.842Z	INFO	kubebuilder.controller	Starting EventSource	{"controller": "instance-controller", "source": "kind source: /, Kind="}
2019-06-03T07:25:07.842Z	INFO	kubebuilder.controller	Starting EventSource	{"controller": "instance-controller", "source": "kind source: /, Kind="}
2019-06-03T07:25:07.940Z	INFO	kubebuilder.controller	Starting EventSource	{"controller": "aws.provider", "source": "kind source: /, Kind="}
2019-06-03T07:25:07.941Z	INFO	kubebuilder.controller	Starting EventSource	{"controller": "s3bucket.aws.crossplane.io", "source": "kind source: /, Kin

teddyking

Rust

Stack and Heap

• Stack = LIFO and is hella fast
• All data on the stack must take up a known, fixed size
• Basic data types (ints, bools, etc.) are all stored on the stack because they have a fixed size
• More complex data types of unknown size get stored on the heap

Ownership

teddyking

package main
import (
        "fmt"
        "log"
        "code.cloudfoundry.org/garden"
        "code.cloudfoundry.org/garden/client"
        "code.cloudfoundry.org/garden/client/connection"
)
func main() {
        var diskLimit uint64

teddyking

Start the containerd daemon

$ containerd -l debug
INFO[0000] starting containerd                           module=containerd revision=bb7b41ad7b3d3eb8b978abee2f5b7a1395b41f4f version=v1.0.0-alpha2-32-gbb7b41ad

Fetch an image

$ ctr content fetch docker.io/library/redis:latest
docker.io/library/redis:latest:                                                   resolved       |++++++++++++++++++++++++++++++++++++++|

teddyking

# list processes in D or Z state, along with kernel function where the processes are sleeping
ps axo pid,ppid,comm,state,eip,esp,wchan | grep 'D\|Z'

# dump all D state processes incl. kernel stack traces to /var/log/messages
 echo w > /proc/sysrq-trigger

# check process start time
ps -eo pid,comm,lstart,etime,time,args

# view syslog without noise

teddyking

#!/bin/bash

set -eu

function ensureMounted() {
  source=$1
  shift
  target=$1
  shift
  type=$1

teddyking

{
	"ociVersion": "1.0.0-rc3",
	"platform": {
		"os": "linux",
		"arch": "amd64"
	},
	"process": {
		"terminal": false,
		"consoleSize": {
			"height": 0,

teddyking

Objective

In this gist, we verified that the iptables regression patches improved performance for both direct iptables executions and for garden NetOut API calls.

In this gist, we attempt to verify that the performance improvements are still seen for the Release Candidate 4.4.0-63.84~14.04.1.

iptables rule addition

teddyking

func startContainer(context *cli.Context, spec *specs.Spec, create bool) (int, error) {
	id := context.Args().First()
	if id == "" {
		return -1, errEmptyID
	}
	container, err := createContainer(context, id, spec)
	if err != nil {
		return -1, err
	}
	// Support on-demand socket activation by passing file descriptors into the container init process.

teddyking

Action: func(context *cli.Context) error {
	if err := checkArgs(context, 1, exactArgs); err != nil {
		return err
	}
	if err := revisePidFile(context); err != nil {
		return err
	}
	spec, err := setupSpec(context)
	if err != nil {
		return err