slok’s gists

slok / k8s-port-forward.go

Created August 31, 2024 16:09

Kubernetes port forward example in go (without kubectl) using official K8s Go libs.

slok / sloth-medium-slo.yaml

Created June 6, 2021 08:25

	version: "prometheus/v1"
	service: "myservice"
	labels:
	owner: "myteam"
	tier: "2"
	slos:
	# We allow failing (5xx and 429) 1 request every 1000 requests (99.9%).
	- name: "requests-availability"
	objective: 99.9
	description: "Common SLO based on availability for HTTP request responses."

slok / yq-k8s-tricks.md

Created March 27, 2021 08:10

yq Kubernetes tricks

yq eval -i '.metadata.namespace |= "argo"' "${FILE}"

yq eval -i 'select(.kind == "Service") |= .spec.ports[] |= select(has("protocol") | not) |= .protocol="TCP" ' ${FILE}

slok / pprof.md

Last active February 20, 2025 05:08

Go pprof cheat sheet

Enable profiling

import (
    _ "net/http/pprof"
    "net/http"
)

slok / k8sunstructured_test.go

Last active April 15, 2020 16:38

	package k8sunstructured_test

	import (
	"bytes"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"

slok / main.go

Created June 4, 2018 15:36

Kubernetes controller that updates annotation on pods with `kooper: test` label

	package main

	import (
	"os"
	"path/filepath"
	"time"

	corev1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime"

slok / kooper-vgo.log

Created May 26, 2018 07:04

vgo kooper try

	$ time vgo build
	vgo: finding github.com/google/cadvisor v0.0.0-20170309230114-17543becf905
	vgo: finding gopkg.in/olivere/elastic.v2 v2.0.0-20151008152123-3cfe88295d20
	vgo: finding golang.org/x/oauth2 v0.0.0-20150321034511-ca8a464d23d5
	vgo: finding golang.org/x/net v0.0.0-20151120032300-5627bad10b82
	vgo: finding github.com/influxdb/influxdb v0.0.0-20151125225445-9eab56311373
	vgo: finding github.com/go-ini/ini v0.0.0-20160207163330-193d1ecb466b
	vgo: finding github.com/eapache/queue v0.0.0-20150606115303-ded5959c0d4e
	vgo: finding github.com/coreos/rkt v0.0.0-20160513154944-14437382a98e
	FindRepo: Get https://speter.net/go/exp/math/dec/inf?go-get=1: x509: certificate signed by unknown authority

slok / handler-opentracing.go

Created May 23, 2018 13:06

kooper handler opentracing

	hand := &handler.HandlerFunc{
	AddFunc: func(ctx context.Context, obj runtime.Object) error {
	// Get the parent span.
	pSpan := opentracing.SpanFromContext(ctx)

	// Create a new span.
	span := tracer.StartSpan("AddFunc", opentracing.ChildOf(pSpan.Context()))
	defer span.Finish()

	// Do stuff...

slok / kooper-example-controller.go

Created February 15, 2018 15:07

	// Initialize logger.
	log := &log.Std{}
	// Create the controller that will refresh every 30 seconds.
	ctrl := controller.NewSequential(30*time.Second, hand, retr, log)
	// Start our controller.
	stopC := make(chan struct{})
	if err := ctrl.Run(stopC); err != nil {
	log.Errorf("error running controller: %s", err)
	os.Exit(1)
	}

slok / kooper-example-handler.go

Created February 15, 2018 15:06

	// Our domain logic that will print every add/sync/update and delete event we .
	hand := &handler.HandlerFunc{
	AddFunc: func(obj runtime.Object) error {
	pod := obj.(*corev1.Pod)
	log.Infof("Pod Add event: %s/%s", pod.Namespace, pod.Name)
	return nil
	},
	DeleteFunc: func(s string) error {
	log.Infof("Pod Delete event: %s", s)
	return nil