[kubernetes] 쿠버네티스 설치 및 설정

포스팅 목차

kubernetes cluster install tools

google kubernetes engine (GKE)

create account on GKE
add method of payment
intall and use gcloud - Vendor-specific command to manage GKE
https://console.cloud.google.com/getting-started

$ gcloud container clusters create xxxx
$ gcloud container clusters list
$ kubectl get nodes
$ gcloud container clusters delete xxxx

Minikube

open source project within Github kubernetes
download from google
assumes VirtualBox already installed
useful for developers
uses Go binary localkube
Also uses Docker

$ curl -Lo minikube https://storage.googleapis.com/minikube/releases/latest/minikube-darwin-amd64
$ chmod +x minikube
$ sudo mv minikube /usr/local/bin
$ minikube start
$ kubectl get nodes

kubespray

https://github.com/kubernetes-incubator/kubespray

kubernetes operations (kops)

AWS 지원, GKE beta, VMWare alpha

kubeadm

available since kubernetes 1.4.0
works with ubuntu 16.04 and cent os 7.1
main-step
- Run kubeadm init on the head node
- Create a network for IP-per-Pod criteria
- Run kubeadm join on worker or secondary master nodes
documentation
https://kubernetes.io/docs/setup/independent/create-cluster-kubeadm/
install A Pod Network
1) Only one pod network per per cluster
2) Several to choose from
- Calico : projectcalico.org
- Canal
- Flannel : github.com/coreos/flannel
- Kube-router : github.com/cloudnativelabs/kube-router
- Romana : github.com/romana/romana
- Weave Net : weave.works/oss/net
$ kubectl create -f https://git.io./weave-kube
3) Can become complicated to manage
4) Several add-ons available

kubectl 설치

install or compile kubectl
main binary for working with objects
available for common distributions via dedicated repos
configuration file : ~/.kube/config
- endpoints
- SSL keys
- contexts

설치시 고려 사항

Which provider should I use?
Public or private cloud?
Which operating system should I use?
Which networking solution should I use?
Do I need an overlay?
Where should I run my etcd cluster?
3 node 형태로 많이 쓰임
Should I configure Highly-Available head nodes (master node)?
고가용성 3가지
- 서비스 자체 관점의 H/A
- master 노드의 H/A (api-server, controller, scheduler..)
- DB (ETCD) H/A

주요 구성 설정들

single-node
Single head node(master node), multiple workers
Multiple head nodes with HA, multiple workers
HA etcd, HA head nodes, multiple workers
Federation(multi cloud) also provides higher availablility

kubernetes를 위한 systemd unit file

https://kubernetes.io/docs/reference/command-line-tools-reference/kube-apiserver/

Hyperkube 사용한 설치

각 이미지를 실행하여 master를 설치 할 수 있다.

$ docker run --rm gcr.io/google_containers/hyperkube:v1.10.12 /hyperkube apiserver --help
$ docker run --rm gcr.io/google_containers/hyperkube:v1.10.12 /hyperkube scheduler --help
$ docker run --rm gcr.io/google_containers/hyperkube:v1.10.12 /hyperkube controller-manager --help