Rodrigo Galba rodrigo-galba

Aula 4: Implantação em cluster

Gerenciando software com Deployments
O que são ReplicaSets
O que são Replicas
Template Deployment
Organizando recursos dentro de um cluster (Namespaces)

Gerenciando software com Deployments

Aula 3: Implantação com Kubernetes

O que é o Kubernetes?

O Kubernetes (também conhecido como K8s) é um sistema de gerenciamento de contêineres open-source que permite automatizar a implantação, escala e gestão de aplicações em contêineres.

Contexto Histórico do Kubernetes

sudo apt install jq

(
NAMESPACE=hanging-namespace
kubectl proxy &
kubectl get namespace $NAMESPACE -o json |jq '.spec = {"finalizers":[]}' >temp.json
curl -k -H "Content-Type: application/json" -X PUT --data-binary @temp.json 127.0.0.1:8001/api/v1/namespaces/$NAMESPACE/finalize

How to get the lock ID for terraform?

I need to force a unlock, but how to get the lock id?

$ terraform destroy
Acquiring state lock. This may take a few moments...

Error: Error locking state: Error acquiring the state lock: 2 error(s) occurred:

Alert manager cluster mode

Given 2 servers,

1 - Configure the Two Alertmanager Instances to Form a Cluster

On both servers, edit the Alertmanager unit file:

sudo vi /etc/systemd/system/alertmanager.service

Prometheus + Push gateway setup

sudo useradd -M -r -s /bin/false pushgateway
wget https://github.com/prometheus/pushgateway/releases/download/v1.2.0/pushgateway-1.2.0.linux-amd64.tar.gz
tar xvfz pushgateway-1.2.0.linux-amd64.tar.gz
sudo cp pushgateway-1.2.0.linux-amd64/pushgateway /usr/local/bin/
sudo chown pushgateway:pushgateway /usr/local/bin/pushgateway
sudo vi /etc/systemd/system/pushgateway.service

Kube state metrics setup

git clone https://github.com/kubernetes/kube-state-metrics.git
cd kube-state-metrics/
kubectl apply -f kubernetes
git checkout v1.8.0
cd ~
vi kube-state-metrics-nodeport-svc.yml

Docker cAdvisor with Prometheus

docker run -d --restart always --name cadvisor -p 8080:8080 -v "/:/rootfs:ro" -v "/var/run:/var/run:rw" -v "/sys:/sys:ro" -v "/var/lib/docker/:/var/lib/docker:ro" google/cadvisor:latest
curl localhost:8080/metrics
ssh cloud_user@<PROMETHEUS_SERVER_PUBLIC_IP>
sudo vi /etc/prometheus/prometheus.yml

Apache metrics + Prometheus

Apache setup

sudo useradd -M -r -s /bin/false apache_exporter
wget https://github.com/Lusitaniae/apache_exporter/releases/download/v0.7.0/apache_exporter-0.7.0.linux-amd64.tar.gz
tar xvfz apache_exporter-0.7.0.linux-amd64.tar.gz
sudo cp apache_exporter-0.7.0.linux-amd64/apache_exporter /usr/local/bin/
sudo chown apache_exporter:apache_exporter /usr/local/bin/apache_exporter

	#!/bin/bash

	set -eu

	export SNAP_NAME="microk8s"
	export SNAP_DATA="/var/snap/microk8s/current/"
	export SNAP="/snap/microk8s/current/"

	export PATH="$SNAP/usr/sbin:$SNAP/usr/bin:$SNAP/sbin:$SNAP/bin:$PATH"
	source $SNAP/actions/common/utils.sh