MODOP – Installation Cluster HA K8S – KubeADM

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Le principe

Les machines de l’infrastructure K8S

Node Master

  • node-K8s-vip : 172.16.185.30
  • node-K8s-vip : 172.16.185.40
  • node-k8s-m01 : 172.16.185.31
  • node-k8s-m02 : 172.16.185.32
  • node-k8s-m03 : 172.16.185.33

Node Worker

  • node-k8s-w01 : 172.16.185.34
  • node-k8s-w02 : 172.16.185.35
  • node-k8s-w03 : 172.16.185.36
  • node-k8s-w04 : 172.16.185.37
  • node-k8s-w05 : 172.16.185.38
  • node-k8s-w06 : 172.16.185.39

Client

  • node-k8s-c01 : 172.16.185.41

Spécification des machines

  • Système OS : RockyLinux 8
  • Mémoire : 2Go RAM
  • vCPU : 2
  • Disk : 20Go
  • vSwitch : vmbr1 (172.16.185.0/24)

Le Pool de machine

Intégrer les machines de l’infrastructure sur vos DNS

[root@dns-pri ~]# vi /var/named/forward.house.cpb

Ajouter à votre zone SOA du DNS

; Infrastructure k8s

; LoadBalancing KeepAlive k8s
node-K8s-vip IN A 172.16.185.30
node-K8s-vip IN A 172.16.185.40

; K8s Master
node-K8s-m01 IN A 172.16.185.31
node-K8s-m02 IN A 172.16.185.32
node-K8s-m03 IN A 172.16.185.33

; K8s Worker
node-K8s-w01 IN A 172.16.185.34
node-K8s-w02 IN A 172.16.185.35
node-K8s-w03 IN A 172.16.185.36
node-K8s-w04 IN A 172.16.185.37
node-K8s-w05 IN A 172.16.185.38
node-K8s-w06 IN A 172.16.185.39
[root@dns-pri ~]# vi /var/named/reverse.house.cpb

Ajouter à votre zone SOA du DNS Reverse

; Infra K8s

; LoadBalancing KeepAlive
30 IN PTR node-K8s-vip.house.cpb.
40 IN PTR node-K8s-vip.house.cpb.

; K8s Master
31 IN PTR node-K8s-m01.house.cpb.
32 IN PTR node-K8s-m02.house.cpb.
33 IN PTR node-K8s-m03.house.cpb.

; K8s Worker
34 IN PTR node-K8s-w01.house.cpb.
35 IN PTR node-K8s-w02.house.cpb.
36 IN PTR node-K8s-w03.house.cpb.
37 IN PTR node-K8s-w04.house.cpb.
38 IN PTR node-K8s-w05.house.cpb.
39 IN PTR node-K8s-w06.house.cpb.
[root@dns-pri ~]# systemctl reload named

Petit Test de résolution sur le node01-k8s-m01

 Installation des machines « Master »

Machine RockyLinux

  • node-K8s-vip : 172.16.185.30 (IP Virtuelle)
  • node-K8s-vip : 172.16.185.40 (IP Virtuelle)
  • node-k8s-m01 : 172.16.185.31
  • node-k8s-m02 : 172.16.185.32
  • node-k8s-m03 : 172.16.185.33

Installer 3 machines sur la configuration suivante

Pool k8s – Machines k8s-Master

1°) Mise à jour RockyLinux 8 (3 master)

[root@node-k8s-m0X ~]# yum –y update && yum upgrade –y

2°) Installation Package/Middleware (sur les 3 master)

[root@node-k8s-m0X ~]# yum install -y qemu-guest-agent wget chrony

3°) Désactiver le swap (3 master)

[root@node-k8s-m0X ~]# swapoff -a
[root@node-k8s-m0X ~]# sed -i '/ swap / s/^\(.*\)$/#/g' /etc/fstab

4°) Changer les permissions SELinux (3 master)

[root@node-k8s-m0X ~]# setenforce 0
[root@node-k8s-m0X ~]# sed -i 's/^SELINUX=enforcing$/SELINUX=disabled/' /etc/selinux/config

5°) Mise en place KeepAlive (3 master)

Installation KeepAlive (3 master)

[root@node-k8s-m0X ~]# yum install -y keepalived
[root@node-k8s-m0X ~]# groupadd -r keepalived_script
[root@node-k8s-m0X ~]# useradd -r -s /sbin/nologin -g keepalived_script -M keepalived_script
[root@node-k8s-m0X ~]# cp /etc/keepalived/keepalived.conf{,-old}
[root@node-k8s-m0X ~]# sh -c '> /etc/keepalived/keepalived.conf'

Configurer KeepAlive – node-k8s-m01 – MASTER 01

[root@node-k8s-m01 ~]# vi /etc/keepalived/keepalived.conf
! /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
 notification_email {
 chris@en-images.info
 }
 notification_email_from chris@en-images.info
 smtp_server localhost
 smtp_connect_timeout 30

 }

vrrp_script check_server {
 script "/etc/keepalived/check_server.sh"
 interval 3
 weight -2
 fall 10
 rise 2

}

vrrp_instance VI_1 {
state MASTER
 interface eth0
 virtual_router_id 51
 priority 100
 authentication {
 auth_type PASS
 auth_pass droopy2021
 }

 virtual_ipaddress {
 172.16.185.30/24
 172.16.185.40/24
 }

 track_script {
 check_server
 }

}

Configurer KeepAlive – node-k8s-m02 – MASTER 02

[root@node-k8s-m02 ~]# vi /etc/keepalived/keepalived.conf
! /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
notification_email {
chris@en-images.info
}
notification_email_from chris@en-images.info
smtp_server localhost
smtp_connect_timeout 30
}

vrrp_script check_server {
script "/etc/keepalived/check_server.sh"
interval 3
weight -2
fall 10
rise 2
}

vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
 priority 99
authentication {
auth_type PASS
auth_pass droopy2021
}

virtual_ipaddress {
172.16.185.30/24
172.16.185.40/24
}

track_script {
check_server
}

}

Configurer KeepAlive – node-k8s-m03 – MASTER 03

[root@node-k8s-m03 ~]# vi /etc/keepalived/keepalived.conf
! /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
 notification_email {
 chris@en-images.info
 }
 notification_email_from chris@en-images.info
 smtp_server localhost
 smtp_connect_timeout 30
 }

vrrp_script check_server {
 script "/etc/keepalived/check_server.sh"
 interval 3
 weight -2
 fall 10
 rise 2
}

vrrp_instance VI_1 {
 state BACKUP
 interface eth0
 virtual_router_id 51
priority 98
 authentication {
 auth_type PASS
 auth_pass droopy2021
 }

 virtual_ipaddress {
 172.16.185.30/24
 172.16.185.40/24
 }

 track_script {
 check_server
 }

}

Script check_server.sh (3 master)

[root@node-k8s-m0X ~]# vi /etc/keepalived/check_server.sh
#!/bin/sh

APISERVER_VIP1=192.168.1.30
APISERVER_VIP2=192.168.1.40
APISERVER_DEST_PORT=6443

errorExit() {
 echo "*** $*" 1>&2
 exit 1
}

curl --silent --max-time 2 --insecure https://localhost:${APISERVER_DEST_PORT}/ -o /dev/null || errorExit "Error GET https://localhost:${APISERVER_DEST_PORT}/"

if ip addr | grep -q ${APISERVER_VIP1}; then
 curl --silent --max-time 2 --insecure https://${APISERVER_VIP1}:${APISERVER_DEST_PORT}/ -o /dev/null || errorExit "Error GET https://${APISERVER_VIP1}:${APISERVER_DEST_PORT}/"
fi

if ip addr | grep -q ${APISERVER_VIP2}; then
 curl --silent --max-time 2 --insecure https://${APISERVER_VIP2}:${APISERVER_DEST_PORT}/ -o /dev/null || errorExit "Error GET https://${APISERVER_VIP2}:${APISERVER_DEST_PORT}/"
fi
[root@node-k8s-m0X ~]# chmod +x /etc/keepalived/check_server.sh

Suppression IPv6(3 master)

[root@node-k8s-m0X ~]# echo "net.ipv4.ip_nonlocal_bind = 1" >> /etc/sysctl.conf
[root@node-k8s-m01 ~]# echo "net.ipv6.conf.all.disable_ipv6 = 1" >> /etc/sysctl.conf 
[root@node-k8s-m01 ~]# echo "net.ipv6.conf.all.autoconf = 0" >> /etc/sysctl.conf 
[root@node-k8s-m01 ~]# echo "net.ipv6.conf.default.disable_ipv6 = 1" >> /etc/sysctl.conf 
[root@node-k8s-m01 ~]# echo "net.ipv6.conf.default.autoconf = 0" >> /etc/sysctl.conf 
[root@node-k8s-m01 ~]# sysctl -p

Rules pour KeepAlive (3 master)

[root@node-k8s-m0X ~]# firewall-cmd --add-rich-rule='rule protocol value="vrrp" accept' --permanent --zone=public
[root@node-k8s-m0X ~]# firewall-cmd --reload

Démarrer le service KeepAlive (3 master)

[root@node-k8s-m0X ~]# systemctl enable keepalived
[root@node-k8s-m0X ~]# systemctl start keepalived
[root@node-k8s-m0X ~]# systemctl status keepalived

[root@node-k8s-m01 ~]# ip a

[root@node-k8s-m02 ~]# ip addr show eth0

[root@node-k8s-m03 ~]# ip addr show eth0

Test Fonctionnel de KeepAlive

Machine node-K8s-m01 est down, la machine node-k8s-m02 prendra le relais.

[root@node-k8s-m01 ~]# systemctl stop keepalived
[root@node-k8s-m02 ~]# ip addr show eth0

Machine node-k8s-m01 et node-k8s-m02 est down, la machine node-k8s-m03 prendra le relais.

[root@node-k8s-m01 ~]# systemctl stop keepalived
[root@node-k8s-m02 ~]# systemctl stop keepalived
[root@node-k8s-m03 ~]# ip addr show eth0

Machine node-K8s-m01 est UP, elle reprendra les IP Virtuelles.

[root@node-k8s-m01 ~]# systemctl start keepalived
[root@node-k8s-m01 ~]# ip addr show eth0

6°) Mise en place HaProxy (3 master)

[root@node-k8s-m0X ~]# yum -y install haproxy
[root@node-k8s-m0X ~]# cp /etc/haproxy/haproxy.cfg{,-old}
[root@node-k8s-m0X ~]# sh -c '> /etc/haproxy/haproxy.cfg'
[root@node-k8s-m0X ~]# vi /etc/haproxy/haproxy.cfg

############################################
# Partie Global , Default et Site Managemnt
#############################################

global
 log 127.0.0.1 local2
 chroot /var/lib/haproxy
 pidfile /var/run/haproxy.pid
 maxconn 4000
 user haproxy
 group haproxy
 daemon

 #description HA Proxy sur l’infrastructure HA K8S Cluster
 stats socket /var/lib/haproxy/stats

defaults
 mode http
 log global
 option dontlognull
 option http-server-close
 option redispatch
 retries 3
 timeout http-request 10s
 timeout queue 1m
 timeout connect 10s
 timeout client 1m
 timeout server 1m
 timeout http-keep-alive 10s
 timeout check 10s
 maxconn 3000

listen stats
 bind *:9000
 stats enable
 stats uri /status
 stats refresh 2s
 stats auth chris:Chris
 stats show-legends
 stats admin if TRUE

###############################################
# Partie LoadBalancing , Répartiton de charge
##############################################

frontend apiserver
 bind *:8443
 mode tcp
 option tcplog
 default_backend apiserver

backend apiserver
 option httpchk GET /healthz
 http-check expect status 200
 mode tcp
 option ssl-hello-chk
 balance roundrobin
 server node-k8s-m01 172.16.185.31:6443 check
 server node-k8s-m02 172.16.185.32:6443 check
 server node-k8s-m03 172.16.185.33:6443 check
[root@node-k8s-m0X ~]# haproxy -f /etc/haproxy/haproxy.cfg -c
Configuration file is valid

Rules firewall (3 master)

[root@node-k8s-m0X ~]# firewall-cmd --add-port=9000/tcp --zone=public --permanent
[root@node-k8s-m0X ~]# firewall-cmd --reload

Démarrer le service HaProxy

[root@node-k8s-m01 ~]# systemctl enable --now haproxy
[root@node-k8s-m01 ~]# systemctl status haproxy

Login/password est celui défini dans le fichier de configuration haproxy.cfg

Pour le moment les machines du BackEnd « ApiServer » est DOWN car le service API de Kubernetes n’est pas encore installé.

7°) Installation de Docker, Kubeadm, kubelet,kubectl (3 master)

Installation Docker

[root@node-k8s-m0X ~]# yum install -y yum-utils
[root@node-k8s-m0X ~]# yum install -y iproute
[root@node-k8s-m0X ~]# yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
Adding repo from: https://download.docker.com/linux/centos/docker-ce.repo
[root@node-k8s-m0X ~]# yum -y install docker-ce
[root@node-k8s-m0X ~]# systemctl enable docker --now
[root@node-k8s-m0X ~]# docker -v
Docker version 20.10.8, build 3967b7d

Installation Kubeadm, kubelet et kubectl

[root@node-k8s-m0X ~]# vi /etc/yum.repos.d/kubernetes.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
exclude=kubelet kubeadm kubectl
[root@node-k8s-m0X ~]# yum -y update
[root@node-k8s-m0X ~]# yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes

Modifier cgroupdriver pour Docker

[root@node-k8s-m0X ~]# docker info | grep -i cgroup
Cgroup Driver: cgroupfs
Cgroup Version: 1
[root@node-k8s-m0X ~]# vi /etc/sysconfig/kubelet

KUBELET_EXTRA_ARGS=--cgroup-driver=cgroupfs

Rules Firewall

[root@node-k8s-m0X ~]# firewall-cmd --permanent --add-port=6443/tcp
[root@node-k8s-m0X ~]# firewall-cmd --permanent --add-port=2379-2380/tcp
[root@node-k8s-m0X ~]# firewall-cmd --permanent --add-port={8443,10250,10251,10252,179}/tcp
[root@node-k8s-m0X ~]# firewall-cmd --add-port={4789,9099}/tcp --permanent
[root@node-k8s-m0X ~]# firewall-cmd --permanent --add-port=4789/udp
[root@node-k8s-m0X ~]# firewall-cmd --add-masquerade --permanent
[root@node-k8s-m01X ~]# firewall-cmd --reload

Rules Réseaux

[root@node-k8s-m01 ~]# modprobe br_netfilter
[root@node-k8s-m01 ~]# echo "br_netfilter" > /etc/modules-load.d/br_netfilter.conf
[root@node-k8s-m01 ~]# sh -c "echo '1' > /proc/sys/net/bridge/bridge-nf-call-iptables"
[root@node-k8s-m01 ~]# sh -c "echo '1' > /proc/sys/net/ipv4/ip_forward"
[root@node-k8s-m01 ~]# systemctl enable kubelet.service
[root@node-k8s-m01 ~]# systemctl restart firewalld

8°) Initialisation du cluster K8S  (3 master)

Initialisation du Cluster (node-k8s-m01)

[root@node-k8s-m01 ~]# kubeadm init --control-plane-endpoint node-k8s-vip:8443 --upload-certs --pod-network-cidr=10.40.0.0/16

Copier les Clef dans un notepad pour les masters et les Worker

kubeadm join node-k8s-vip:8443 --token yu02zl.uinudjew3x8tps9h \
--discovery-token-ca-cert-hash sha256:035c2e4145b54d4235d8522d24ed9565ec81a2b7a169929a44ab51ba5e0ea816 \
--control-plane --certificate-key 5719b3e91ff1c759988e8fa0b1c59ff7ff005bed3c169c88528cf26325e2ca84

Please note that the certificate-key gives access to cluster sensitive data, keep it secret!
As a safeguard, uploaded-certs will be deleted in two hours; If necessary, you can use
"kubeadm init phase upload-certs --upload-certs" to reload certs afterward.

Then you can join any number of worker nodes by running the following on each as root:

kubeadm join node-k8s-vip:8443 --token yu02zl.uinudjew3x8tps9h \
--discovery-token-ca-cert-hash sha256:035c2e4145b54d4235d8522d24ed9565ec81a2b7a169929a44ab51ba5e0ea816
[root@node-k8s-m01 ~]# mkdir -p $HOME/.kube
[root@node-k8s-m01 ~]# cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
[root@node-k8s-m01 ~]# chown $(id -u):$(id -g) $HOME/.kube/config
[root@node-k8s-m01 ~]# curl https://docs.projectcalico.org/manifests/calico.yaml -O
[root@node-k8s-m01 ~]# kubectl apply -f calico.yaml

[root@node-k8s-m01 ~]# kubectl get nodes
node-k8s-m01 Ready control-plane,master 27m v1.22.2

Ajouter le node-k8s-m02 au Cluster

[root@node-k8s-m02 ~]# vi /etc/sysconfig/kubelet
KUBELET_EXTRA_ARGS=--cgroup-driver=cgroupfs
[root@node-k8s-m02 ~]# kubeadm join node-k8s-vip:8443 --token yu02zl.uinudjew3x8tps9h \
--discovery-token-ca-cert-hash sha256:035c2e4145b54d4235d8522d24ed9565ec81a2b7a169929a44ab51ba5e0ea816 \
--control-plane --certificate-key 5719b3e91ff1c759988e8fa0b1c59ff7ff005bed3c169c88528cf26325e2ca84
[root@node-k8s-m02 ~]# mkdir -p $HOME/.kube
[root@node-k8s-m02 ~]# cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
[root@node-k8s-m02 ~]# chown $(id -u):$(id -g) $HOME/.kube/config

root@node-k8s-m01 ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
node-k8s-m01 Ready control-plane,master 176m v1.22.2
node-k8s-m02 Ready control-plane,master 137m v1.22.2

Ajouter le node-k8s-m03 au Cluster

[root@node-k8s-m03 ~]# vi /etc/sysconfig/kubelet
KUBELET_EXTRA_ARGS=--cgroup-driver=cgroupfs
[root@node-k8s-m03 ~]# kubeadm join node-k8s-vip:8443 --token yu02zl.uinudjew3x8tps9h \
--discovery-token-ca-cert-hash sha256:035c2e4145b54d4235d8522d24ed9565ec81a2b7a169929a44ab51ba5e0ea816 \
--control-plane --certificate-key 5719b3e91ff1c759988e8fa0b1c59ff7ff005bed3c169c88528cf26325e2ca84
[root@node-k8s-m03 ~]# mkdir -p $HOME/.kube
[root@node-k8s-m03 ~]# cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
[root@node-k8s-m03 ~]# chown $(id -u):$(id -g) $HOME/.kube/config

[root@node-k8s-m01 ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
node-k8s-m01 Ready control-plane,master 45m v1.22.2
node-k8s-m02 Ready control-plane,master 6m55s v1.22.2
node-k8s-m03 Ready control-plane,master 77s v1.22.2
[root@node-k8s-m01 ~]# kubectl get pods -n kube-system

Installation des machines « Worker»

Machine RockyLinux

  • node-k8s-w01 : 172.16.185.34
  • node-k8s-w02 : 172.16.185.35
  • node-k8s-w03 : 172.16.185.36
  • node-k8s-w04 : 172.16.185.37
  • node-k8s-w05 : 172.16.185.38
  • node-k8s-w06 : 172.16.185.39

Installer 6 machines sur la configuration suivante

Pool k8s – Machines k8s-worker

1°) Mise à jour RockyLinux 8 (6 Worker)

[root@node-k8s-w0X ~]# yum -y update && yum -y upgrade

2°) Installation Package/Middleware (6 Worker)

[root@node-k8s-w0X ~]# yum install -y qemu-guest-agent wget chrony

3°) Désactiver le swap (6 Worker)

[root@node-k8s-w0X ~]# swapoff -a
[root@node-k8s-w0X ~]# sed -i '/ swap / s/^\(.*\)$/#/g' /etc/fstab

4°) Changer les permissions SELinux (6 Worker)

[root@node-k8s-w0X ~]# setenforce 0
[root@node-k8s-w0X ~]# sed -i 's/^SELINUX=enforcing$/SELINUX=disabled/' /etc/selinux/config

5°) Installation Docker (6 Worker)

[root@node-k8s-w0X ~]# yum install -y yum-utils
[root@node-k8s-w0X ~]# yum install -y iproute
[root@node-k8s-w0X ~]# yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
Adding repo from: https://download.docker.com/linux/centos/docker-ce.repo
[root@node-k8s-w0X ~]# yum -y install docker-ce
[root@node-k8s-w0X ~]# systemctl enable --now docker
[root@node-k8s-w0X ~]# docker -v
Docker version 20.10.8, build 3967b7d

6°) Installation Kubeadm, kubelet et kubectl (6 Worker)

[root@node-k8s-w0X ~]# vi /etc/yum.repos.d/kubernetes.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
exclude=kubelet kubeadm kubectl
[root@node-k8s-m0X ~]# yum -y update
[root@node-k8s-m0X ~]# yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes
[root@node-k8s-w0X ~]# systemctl enable kubelet.service

7°) Rules Firewall(6 Worker)

[root@node-k8s-w0X ~]# firewall-cmd --permanent --add-port=30000-32767/tcp
[root@node-k8s-w0X ~]# firewall-cmd --permanent --add-port={10250,179}/tcp
[root@node-k8s-w0X ~]# firewall-cmd --permanent --add-port=4789/udp
[root@node-k8s-w0X ~]# firewall-cmd --add-port={4789,9099}/tcp –permanent
[root@node-k8s-w0X ~]# firewall-cmd --add-masquerade –permanent

8°) Rules Applicatifs (6 Worker)

[root@node-k8s-w0X ~]# firewall-cmd --permanent --add-port=80/tcp
[root@node-k8s-w0X ~]# firewall-cmd --reload

9°) Ajout Règle Bridge pour le réseau Interne k8s(6 Worker)

[root@node-k8s-w01 ~]# modprobe br_netfilter
[root@node-k8s-w01 ~]# echo "net.ipv4.ip_nonlocal_bind = 1" >> /etc/sysctl.conf
[root@node-k8s-w01 ~]# echo "net.bridge.bridge-nf-call-ip6tables = 1" >> /etc/sysctl.conf
[root@node-k8s-w01 ~]# echo "net.bridge.bridge-nf-call-iptables = 1" >> /etc/sysctl.conf
[root@node-k8s-w01 ~]# sh -c "echo '1' > /proc/sys/net/bridge/bridge-nf-call-iptables"
[root@node-k8s-w01 ~]# sh -c "echo '1' > /proc/sys/net/ipv4/ip_forward"

10°) Suppression IPv6(6 Worker)

[root@node-k8s-m01 ~]# echo "net.ipv6.conf.all.disable_ipv6 = 1" >> /etc/sysctl.conf
[root@node-k8s-m01 ~]# echo "net.ipv6.conf.all.autoconf = 0" >> /etc/sysctl.conf
[root@node-k8s-m01 ~]# echo "net.ipv6.conf.default.disable_ipv6 = 1" >> /etc/sysctl.conf
[root@node-k8s-m01 ~]# echo "net.ipv6.conf.default.autoconf = 0" >> /etc/sysctl.conf
[root@node-k8s-m01 ~]# sysctl -p

11°) Ajouter les node-k8s-w0x au Cluster(6 Worker)

[root@node-k8s-w0X~]# vi /etc/sysconfig/kubelet
KUBELET_EXTRA_ARGS=--cgroup-driver=cgroupfs
[root@node-k8s-w01 ~]# kubeadm join node-k8s-vip:8443 --token yu02zl.uinudjew3x8tps9h \
--discovery-token-ca-cert-hash sha256:035c2e4145b54d4235d8522d24ed9565ec81a2b7a169929a44ab51ba5e0ea816

Check des Worker sur le Cluster master01

[root@node-k8s-m01 ~]# kubectl get nodes

[root@node-k8s-m01 ~]# kubectl get nodes -o wide

[root@node-k8s-m01 ~]# kubectl get all -A

Côté HaProxy

Installation d’un client « DevOP » pour les tests

Machine RockyLinux

  • node-k8s-c01 : 172.16.185.41

1°) Mise à jour RockyLinux 8 

[root@node-k8s-c01 ~]# yum -y update && yum -y upgrade

2°) Installation Package/Middleware 

[root@node-k8s-c01 ~]# yum install -y qemu-guest-agent wget chrony

3° ) Désactiver le swap 

[root@node-k8s-c01 ~]# swapoff -a
[root@node-k8s-c01 ~]# sed -i '/ swap / s/^\(.*\)$/#/g' /etc/fstab

4°) Changer les permissions SELinux 

[root@node-k8s-c01 ~]# setenforce 0
[root@node-k8s-c01 ~]# sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config

5°) Installation kubectl 

[root@node-k8s-c01 ~]# vi /etc/yum.repos.d/kubernetes.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
exclude=kubelet kubeadm kubectl
[root@node-k8s-c01 ~]# yum install -y kubectl --disableexcludes=kubernetes

6°) Transfert de la Conf Master du Cluster sur le client DEV

[root@node-k8s-c01 ~]# mkdir -p $HOME/.kube
[root@node-k8s-c01 ~]# scp root@node-k8s-m01:/etc/kubernetes/admin.conf $HOME/.kube/config
[root@node-k8s-c01 ~]# chown $(id -u):$(id -g) $HOME/.kube/config
[root@node-k8s-c01 ~]# kubectl get nodes

7°) Déployer une image Apache via NodePort

[root@node-k8s-c01 ~]# kubectl create deployment serv1 --image=httpd
deployment.apps/serv1 created
[root@node-k8s-c01 ~]# kubectl get deployments.apps serv1
NAME READY UP-TO-DATE AVAILABLE AGE
serv1 1/1 1 1 76s
[root@node-k8s-c01 ~]# kubectl get pods
NAME READY STATUS RESTARTS AGE
serv1-f684bf4bf-lhthx 1/1 Running 0 57s
[root@node-k8s-c01 ~]# kubectl get pods -o wide

8°) Ajout de réplica pour Augmenter la résilience du service Apache

[root@node-k8s-c01 ~]# kubectl scale deployment serv1 --replicas=3
deployment.apps/serv1 scaled
[root@node-k8s-c01 ~]# kubectl get pods

[root@node-k8s-c01 ~]# kubectl get deployments.apps serv1
NAME READY UP-TO-DATE AVAILABLE AGE
serv1 3/3 3 3 3m56s
[root@node-k8s-c01 ~]# kubectl get pods -o wide

[root@node-k8s-c01 ~]# kubectl expose deployment serv1 --name=serv1 --type=NodePort --port=80 --target-port=80
service/serv1 exposed
[root@node-k8s-c01 ~]# kubectl get svc serv1

9°) Test d’accès au service serv1 via le LoadBalancing « node-k8s-vip »

[root@node-k8s-c01 ~]# curl http://node-k8s-vip:32335
<html><body><h1>It works!</h1></body></html>

10°) Test d’accès au service serv1 via les node « Master » et « Worker »

Sur les Masters 

[root@node-k8s-c01 ~]# curl http://node-k8s-m01:32335
<html><body><h1>It works!</h1></body></html>
[root@node-k8s-c01 ~]# curl http://node-k8s-m02:32335
<html><body><h1>It works!</h1></body></html>
[root@node-k8s-c01 ~]# curl http://node-k8s-m03:32335
<html><body><h1>It works!</h1></body></html>

Sur les Workers 

[root@node-k8s-c01 ~]# curl http://node-k8s-w01:32335
<html><body><h1>It works!</h1></body></html>
[root@node-k8s-c01 ~]# curl http://node-k8s-w02:32335
<html><body><h1>It works!</h1></body></html>
[root@node-k8s-c01 ~]# curl http://node-k8s-w03:32335
<html><body><h1>It works!</h1></body></html>
[root@node-k8s-c01 ~]# curl http://node-k8s-w04:32335
<html><body><h1>It works!</h1></body></html>
[root@node-k8s-c01 ~]# curl http://node-k8s-w05:32335
<html><body><h1>It works!</h1></body></html>
[root@node-k8s-c01 ~]# curl http://node-k8s-w06:32335
<html><body><h1>It works!</h1></body></html>

Le service httpd est accessible via tous les workers , Master et IP Vip.

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