alces’s gists

alces / find_pods_by_image_id.sh

Created September 10, 2024 12:59

Find all k8s pods running an image with a given imageID

	#!/bin/bash -e

	# Find all the pods using a given imageID

	kubectl get pods --all-namespaces \
	-o 'custom-columns=NS:.metadata.namespace,NAME:.metadata.name,IMAGE:.status.containerStatuses[*].imageID' \|
	awk '{if ($3 ~ "bitnami/external-dns@sha256:b615d1c97d93e5a4d83da00de8d1854f0274814b4ef57708d0ed9341205753e9") {print $1 "/" $2}}'

alces / k8s_patch_sidecar_version.sh

Created September 5, 2024 08:51

Upgrade a version of sidecar container image in all namespaces where it's used

	for ns in $(kubectl get sts --all-namespaces \| awk '{if ($2 == "zookeeper") {print $1}}'); do
	if [ $(kubectl get sts zookeeper -n $ns -o json \| jq '.spec.template.spec.containers[1].image') != null ]; then
	kubectl patch sts zookeeper -n $ns \
	-p '{"spec":{"template":{"spec": {"containers":[{"name": "jmx-exporter", "image":"bitnami/jmx-exporter:1.0.1"}]}}}}'
	fi
	done

alces / k8s_nifi_grep.sh

Created June 30, 2023 14:01

Looking for a pattern inside NiFi flowfiles on multiple clusters deployed atop of k8s

	#!/bin/bash

	PATTERN='for-example-a-kafka-topic-name-to-look-for'

	for ns in $(kubectl get ns \| awk '{if ($1 !~ /^NAME\|kube-/) {print $1}}')
	do
	echo "Looking into $ns"
	kubectl exec -n "$ns" -c nifi nifi-0 -- zgrep "$PATTERN" permanent_configs/flow.xml.gz 2>/dev/null
	done

alces / fieldalignment_fix.sh

Created December 30, 2022 14:12

Fixing fieldalignment issues reported by govet

	go install golang.org/x/tools/go/analysis/passes/fieldalignment/cmd/fieldalignment

	fieldalignment -fix a_problematic_file.go

alces / install_terraform_provider.sh

Created December 7, 2022 13:21

Install a Terraform provider to a cache (tested on alpine Docker image)

	#!/bin/sh -e

	# Install a Terraform provider

	OS=linux
	ARCH=amd64

	OPTS=`getopt -l dont-unzip,full-url:,group:,provider:,site:,url:,version: -- df:g:p:u:s:v: "$@"` \|\| exit 1
	eval set -- "$OPTS"

alces / signalflow_metrics.go

Created November 16, 2022 11:32

Getting metrics from SignalFX

	package main

	import (
	"fmt"
	"log"

	. "github.com/signalfx/signalfx-go/signalflow"
	)

	const (

alces / gcloud_function_call.sh

Created March 26, 2021 12:20

Call Google Cloud function from command line

alces / ec2_instance_creation_time.py

Created November 27, 2020 13:45

Print out "creation time" for EC2 instances (in reality, it's the first network interface attachement time)

	import boto3
	import datetime

	# iterator over EC2 instances for region
	def ec2_instances(region):
	client = boto3.client('ec2', region_name = region)
	for reservation in client.describe_instances().get('Reservations', []):
	for instance in reservation.get('Instances', []):
	yield instance

alces / ansible_pass_list.sh

Created October 1, 2020 09:18

Passing a list as a value of an external Ansible variable

ansible-playbook our_playbook.yml -e '{"our_var": ["one", "two", "three",]}'

alces / lenses-cli-groups.sh

Created July 6, 2020 12:45

Manipulating groups with lenses-cli

	# Nice doc is here: https://docs.lenses.io/dev/lenses-cli/index.html
	LENSES_CLI_CMD="lenses-cli --host https://10.0.17.20:9991/ --user admin --pass admin --insecure groups"

	# Get the list
	$LENSES_CLI_CMD get --output JSON

	# Group config file
	cat > config.yaml << EOF
	name: windows_admins
	description: "Admins from AD"

Alexey Zalesny alces