Feilong Wang openstacker

OpenStack and Kubernetes ecosystem contributor

openstacker / gist:3d65f95e8d7d30cb118ffdf4ad7b3160

Created July 28, 2020 01:46

debug memory leak


	Member
	SuperQ commented on 23 Jul 2018 •
	One additional debugging option, get a dump of the goroutines with http://localhost:9100/debug/pprof/goroutine?debug=1. Normally it would be only a few, like this.

	@juliusv

	Member
	juliusv commented on 23 Jul 2018
	@SuperQ Yeah, I would recommend listing the active goroutines, as we already know it's connected to a goroutine leak. But prefer debug=2 over debug=1, so: http://localhost:9100/debug/pprof/goroutine?debug=2

openstacker / gist:1c29260894cc89e9c2e72e2968958490

Created July 8, 2020 02:49

error: unable to retrieve the complete list of server APIs: metrics.k8s.io/v1beta1: the server is currently unable to handle the request

	For anyone who hits this, it's caused by api-services that no longer have backends running...

	In my case it was KEDA, but there are a number of different services that install aggregated API servers.

	To fix it:

	kubectl get apiservice
	Look for ones the AVAILABLE is False

	If you don't need those APIs any more, delete them:

openstacker / gist:b959eda152d2f3844e50ab98d07814f2

Created July 7, 2020 03:08

simple webserver with nc

	echo "HTTP/1.1 200 OK
	Content-Type: text/html; charset=UTF-8
	Server: netcat!

	<!doctype html>
	<html><body><h1>`hostname`</h1></body></html>" > index.http && while true; do cat index.http \| nc -l -p 80; done

openstacker / gist:509e67ddb526e9b85499330a3a190338

Created July 6, 2020 05:06

build curl to support dns

	If you want installable .deb package instead of putting everything to /usr/local, do this:

	sudo apt-get build-dep curl
	sudo apt-get install libc-ares-dev build-essential
	apt-get source curl
	cd curl-*
	This will download curl sources with Debian/Ubuntu build files and patches.

	Edit file debian/control: add line libc-ares-dev to Build-Depends

openstacker / build k8s hyperkube

Last active May 31, 2020 20:11

	$ export DOCKER_REGISTRY=flwang
	$ export HYPERKUBE_VERSION=v1.16.9
	$ export KUBE_GIT_TREE_STATE="clean"
	$ bash build/run.sh make cross KUBE_FASTBUILD=true ARCH=amd64 && cd cluster/images/hyperkube/ && make VERSION=$HYPERKUBE_VERSION ARCH=amd64 REGISTRY=$DOCKER_REGISTRY && docker push $DOCKER_REGISTRY/hyperkube-amd64:$HYPERKUBE_VERSION

openstacker / gist:63f1dd4de96ef0dbdccefd6ede634e7b

Last active May 21, 2020 04:41

Filter k8s template

	openstack coe cluster template list --fields public,hidden,network_driver -f json \| jq -c '.[] \| select(.public==true and .hidden==false)'

	glance --os-image-api-version 1 image-create --disk-format raw --container-format bare --file fedora-coreos-31.20200505.3.0-openstack.x86_64.raw --min-disk 10 --size 10737418240 --name fedora-coreos-31-x86_64 --is-public=True

openstacker / devstack k8s template

Created April 12, 2020 05:00

devstack k8s template

	openstack coe cluster template create cc-v1.17.4 \
	--keypair feilong \
	--flavor ds1G \
	--master-flavor ds2G \
	--coe kubernetes \
	--external-network e0943db8-4e34-4ef0-8973-93ef72a735e4 \
	--network-driver calico \
	--docker-storage-driver=overlay2 \
	--image=0529c960-92cf-4913-b079-4b7b2984ef4a \
	--volume-driver=cinder \

openstacker / gist:29bb95ec57f134fbe547dbb159bbe635

Last active April 15, 2020 08:01

Test Prometheus and Grafana

	kubectl port-forward prometheus-prometheus-prometheus-0 -n kube-system 9090:9090

	kubectl port-forward prometheus-operator-grafana-597f5fdffc-q5c7m -n kube-system 3000:3000

	kubectl delete apiservice v1beta1.custom.metrics.k8s.io

openstacker / set terminal title

Created March 26, 2020 21:54

set terminal title

openstacker / test ds

Created March 26, 2020 21:19

test ds