busyboy77

Rancher v2.6.3 and up single install embedded etcd maintenance

This is not official documentation, have/make backups, use at your own risk.

v2.6.3 and up only

When etcd db size exceeds quota, it will raise an alarm and throw the error mvcc: database space exceeded.

To manually trigger this situation:

On-Prem RKE2 api-server HA with Kube-VIP

               ,        ,  _______________________________
   ,-----------|'------'|  |                             |
  /.           '-'    |-'  |_____________________________|
 |/|             |    |    
   |   .________.'----'    _______________________________
   |  ||        |  ||      |                             |
   \__|'        \__|'      |_____________________________|

k3s etcd commands

etcd

Setup etcdctl using the instructions at https://github.com/etcd-io/etcd/releases/tag/v3.4.13 (changed path to /usr/local/bin):

Note: if you want to match th etcdctl binaries with the embedded k3s etcd version, please run the curl command for getting the version first and adjust ETCD_VER below accordingly:

curl -L --cacert /var/lib/rancher/k3s/server/tls/etcd/server-ca.crt --cert /var/lib/rancher/k3s/server/tls/etcd/server-client.crt --key /var/lib/rancher/k3s/server/tls/etcd/server-client.key https://127.0.0.1:2379/version

How to mount a qcow2 disk image

This is a quick guide to mounting a qcow2 disk images on your host server. This is useful to reset passwords, edit files, or recover something without the virtual machine running.

Step 1 - Enable NBD on the Host

modprobe nbd max_part=8

	apiVersion: v1
	kind: Secret
	metadata:
	name: index-template
	stringData:
	template: '{"index_patterns":["logstash-*"],"template":{"aliases":{"logstash":{}},"mappings":{"dynamic":"true","dynamic_date_formats":["strict_date_optional_time","yyyy/MM/dd HH:mm:ss Z\|\|yyyy/MM/dd Z"],"dynamic_templates":[]},"settings":{"index":{"lifecycle":{"name":"logstash_policy","rollover_alias":"logstash"},"number_of_shards":"1","number_of_replicas":"0"}}}}'

	apiVersion: v1
	kind: Secret
	metadata:
	name: index-template
	stringData:
	template: '{"index_patterns":["logstash-*"],"template":{"aliases":{"logstash":{}},"mappings":{"dynamic":"true","dynamic_date_formats":["strict_date_optional_time","yyyy/MM/dd HH:mm:ss Z\|\|yyyy/MM/dd Z"],"dynamic_templates":[]},"settings":{"index":{"lifecycle":{"name":"logstash_policy","rollover_alias":"logstash"},"number_of_shards":"1","number_of_replicas":"0"}}}}'

	#!/usr/bin/env bash
	set -ex
	export TEST_CLUSTER_NAME=quick-test
	export CERT_MANAGER_VERSION=v1.3.1
	export KIND_IMAGE=kindest/node:v1.20.2

	# Create test cluster
	echo "Creating test cluster..."
	kind create cluster --name="$TEST_CLUSTER_NAME" --image="$KIND_IMAGE"
	until kubectl --timeout=120s wait --for=condition=Ready pods --all --namespace kube-system; do sleep 1; done

	apiVersion: logging.banzaicloud.io/v1beta1
	kind: ClusterFlow
	metadata:
	name: archive
	spec:
	match:
	- select: {}
	outputRefs:
	- s3

	#!/bin/bash
	#https://gist.github.com/davidedg/c29c478ee9c15a804a99cbd1de364647#file-userdata
	# Intended to run together with AMI amzn-ami-vpc-nat-hvm-*, with ASG min=max=desired=1
	# Tested with amzn-ami-vpc-nat-hvm-2018.03.0.20180811-x86_64-ebs (ami-0ea87e2bfa81ca08a)
	# Expected TAGS:
	# - Backend Subnets: Name=InternetNAT Values=AvailabilityZone ( eg: eu-west-1 ) where Frontend NAT Instance is (this allows for multiple NAT instances to serve differenze AZ subnets
	# - Backend Subnets + ASG: Name=Environment, Values=EnvironmentLabel ( eg: "production", "staging" ... ) (this allows for multiple environments in same VPC, served by different NAT instances)
	# - ASG: Name=EIP Values=EIP-allocation-id ( eg eipalloc-abcdef12 )
	PATH="/usr/sbin:/sbin:/usr/bin:/bin"
	function log { logger -t "NAT-instance" -- $1; }