[ Descomplicando o Kubernetes ] 04 - Configurando um cluster kubernetes sem o docker

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Portas necessárias para o cluster:

MASTER

kube-apiserver => 6443 TCP

etcd server API => 2379-2380 TCP

Kubelet API => 10250 TCP

kube-scheduler => 10251 TCP

kube-controller-manager => 10252 TCP

Kubelet API Read-only => 10255 TCP

WORKER

Kubelet API => 10250 TCP

Kubelet API Read-only => 10255 TCP

NodePort Services => 30000-32767 TCP

# vim /etc/modules-load.d/k8s.conf

br_netfilter

ip_vs_rr

ip_vs_wrr

ip_vs_sh

nf_conntrack_ipv4

ip_vs

# vim /etc/sysctl.d/k8s.conf

net.bridge.bridge-nf-call-ip6tables = 1

net.bridge.bridge-nf-call-iptables = 1

net.ipv4.ip_forward=1

# sysctl --system

# yum upgrade -y

# yum install -y vim bash-completion wget

# reboot

# vim /etc/yum.repos.d/k8s.repo

[kubernetes]

name=Kubernetes

baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64

enabled=1

gpgcheck=1

repo_gpgcheck=1

gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg

# yum install -y kubelet kubeadm kubectl

# systemctl enable kubelet

# systemctl start kubelet

# wget https://github.com/containerd/containerd/releases/download/v1.2.1/containerd-1.2.1.linux-amd64.tar.gz

# tar xf containerd-1.2.1.linux-amd64.tar.gz -C /usr/local/ # wget -O /usr/local/sbin/runc https://github.com/opencontainers/runc/releases/download/v1.0.0-rc6/runc.amd64

# chmod 755 /usr/local/sbin/runc # containerd --version

# runc --version

# curl -o /etc/systemd/system/containerd.service https://raw.githubusercontent.com/containerd/cri/master/contrib/systemd-units/containerd.service

# systemctl daemon-reload

# systemctl enable containerd

# systemctl start containerd

# systemctl status containerd

# echo "runtime-endpoint: unix:///run/containerd/containerd.sock" > /etc/crictl.yaml

# vim /etc/systemd/system/kubelet.service.d/0-containerd.conf [Service] Environment="KUBELET_EXTRA_ARGS=--container-runtime=remote --runtime-request-timeout=15m --container-runtime-endpoint=unix:///run/containerd/containerd.sock"

# systemctl daemon-reload

# setenforce 0

# systemctl stop firewalld

# systemctl disable firewalld

# swapoff -a

# vim /etc/fstab

# kubeadm init --cri-socket /run/containerd/containerd.sock

# mkdir -p $HOME/.kube

# sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config

# sudo chown $(id -u):$(id -g) $HOME/.kube/config

# kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"

# kubeadm token create --print-join-command

# kubeadm join --cri-socket /run/containerd/containerd.sock --token <TOKEN> MASTER_IP:6443 --discovery-token-ca-cert-hash sha256:37092 --ignore-preflight-errors=all

# kubectl get nodes

# crictl ps

# crictl --help