TBeijen

HOWTO

Find and delete persistent volume contents

Problem:

• PV contents keep re-appearing, even when PV/PVC is removed even when persistentVolumeReclaimPolicy is set to Delete
• Underlying docker-desktop VM apparently still has contents

TBeijen

Various problems

VM time wrong after host sleep

Various ways this can manifest, examples:

• AWS sts problems
• Debian package list 'not valid yet': Release file for http://deb.debian.org/debian/dists/bullseye-updates/InRelease is not valid yet

TBeijen

goroutine 2858169 [running]:
runtime/pprof.writeGoroutineStacks({0x7fc23ed13bb0, 0xc0314b8820})
	/usr/local/go/src/runtime/pprof/pprof.go:693 +0x70
runtime/pprof.writeGoroutine({0x7fc23ed13bb0, 0xc0314b8820}, 0xc00085e800)
	/usr/local/go/src/runtime/pprof/pprof.go:682 +0x2b
runtime/pprof.(*Profile).WriteTo(0x2974720, {0x7fc23ed13bb0, 0xc0314b8820}, 0xc)
	/usr/local/go/src/runtime/pprof/pprof.go:331 +0x14b
net/http/pprof.handler.ServeHTTP({0xc0279c60fd, 0x8281e7}, {0x7fc3884310e0, 0xc0314b8820}, 0x8)
	/usr/local/go/src/net/http/pprof/pprof.go:253 +0x49a
net/http/pprof.Index({0x7fc3884310e0, 0xc0314b8820}, 0xc0374e9b00)

TBeijen

# List EKS addons AWS considers default for given cluster cersion
aws eks describe-addon-versions |jq '.addons[] | del(.addonVersions[].compatibilities[] | select(.clusterVersion != "1.22" or .defaultVersion != true) ) | del(.addonVersions[] | select(.compatibilities | length == 0) )'

TBeijen

# Taken and adapted from https://gist.github.com/phrawzty/62540f146ee5e74ea1ab
#!/usr/bin/env python2

import SimpleHTTPServer
import SocketServer
import logging
import sys

logging.basicConfig(stream=sys.stdout, level=logging.DEBUG)

TBeijen

$: kubectl describe node ip-10-150-36-156.eu-west-1.compute.internal

<truncated>

Events:
  Type     Reason                   Age                From                                                     Message
  ----     ------                   ----               ----                                                     -------
  Normal   Starting                 36m                kubelet, ip-10-150-36-156.eu-west-1.compute.internal     Starting kubelet.
  Normal   NodeHasSufficientDisk    36m (x2 over 36m)  kubelet, ip-10-150-36-156.eu-west-1.compute.internal     Node ip-10-150-36-156.eu-west-1.compute.internal status is now: NodeHasSufficientDisk
  Normal   NodeHasSufficientMemory  36m (x2 over 36m)  kubelet, ip-10-150-36-156.eu-west-1.compute.internal     Node ip-10-150-36-156.eu-west-1.compute.internal status is now: NodeHasSufficientMemory

TBeijen

$: kubectl get nodes
NAME                                          STATUS     ROLES     AGE       VERSION
ip-10-150-34-78.eu-west-1.compute.internal    Ready      master    43d       v1.10.6
ip-10-150-35-189.eu-west-1.compute.internal   Ready      node      2h        v1.10.6
ip-10-150-36-156.eu-west-1.compute.internal   Ready      node      2h        v1.10.6
ip-10-150-37-179.eu-west-1.compute.internal   NotReady   node      2h        v1.10.6
ip-10-150-37-37.eu-west-1.compute.internal    Ready      master    43d       v1.10.6
ip-10-150-38-190.eu-west-1.compute.internal   Ready      node      4h        v1.10.6
ip-10-150-39-21.eu-west-1.compute.internal    NotReady   node      2h        v1.10.6
ip-10-150-39-64.eu-west-1.compute.internal    Ready      master    43d       v1.10.6

TBeijen

import logging

from django import http
from django.views.generic import RedirectView

logger = logging.getLogger('django.request')


class Redirect307View(RedirectView):
    """

TBeijen

// /src/org/foo/utils.groovy
package org.foo

class Utils {
    static def doStuff() {
        return "done"
    }
}

// /vars/example.groovy

TBeijen

Fisher–Yates shuffle

https://en.wikipedia.org/wiki/Fisher%E2%80%93Yates_shuffle

Mentioned: https://labs.spotify.com/2014/02/28/how-to-shuffle-songs/

Euclidion algorithm

Compute greatest common divisor: https://en.wikipedia.org/wiki/Euclidean_algorithm

Haversine formula

Distance 2 ponits over surface earth: http://www.movable-type.co.uk/scripts/latlong.html