Etapa 1 – Instalando HAProxy e Keepalived para Load Balancer Estimated reading: 3 minutes 298 views Contributors Ambientelb1: 192.168.1.190lb2: 192.168.1.191VIP: 192.168.1.200 (o IP flutuante que o kubeadm vai usar)Passo 1 – Pré-requisitosUbuntu 22.04 (ou similar)Interface de rede: eth0 (verifique com ip a)Acesso root ou sudoPasso 2 – Instalar HAProxyExecute em lb1 e lb2:sudo apt update && sudo apt install -y haproxysudo apt update && sudo apt install -y haproxyPasso 3 – Configurar o HAProxyEm ambos (lb1 e lb2):Edite o arquivo /etc/haproxy/haproxy.cfg:sudo nano /etc/haproxy/haproxy.cfgsudo nano /etc/haproxy/haproxy.cfgSubstitua o conteúdo por:global log /dev/log local0 maxconn 2000 daemon defaults log global mode tcp option tcplog timeout connect 10s timeout client 1m timeout server 1m frontend kubernetes-api bind *:6443 default_backend kubernetes-masters backend kubernetes-masters balance roundrobin server master1 192.168.1.201:6443 check server master2 192.168.1.202:6443 checkglobal log /dev/log local0 maxconn 2000 daemon defaults log global mode tcp option tcplog timeout connect 10s timeout client 1m timeout server 1m frontend kubernetes-api bind *:6443 default_backend kubernetes-masters backend kubernetes-masters balance roundrobin server master1 192.168.1.201:6443 check server master2 192.168.1.202:6443 checkAltere os IPs 192.168.1.201 e 202 conforme o IP dos seus control planes.Salve e reinicie o serviço:sudo systemctl restart haproxy sudo systemctl enable haproxysudo systemctl restart haproxy sudo systemctl enable haproxyPasso 4 – Instalar KeepalivedExecute em lb1 e lb2:sudo apt install -y keepalivedsudo apt install -y keepalivedPasso 5 – Configurar o KeepalivedEm lb1 (PRINCIPAL):cat <<EOF | sudo tee /etc/keepalived/keepalived.conf vrrp_instance VI_1 { state MASTER interface eth0 virtual_router_id 51 priority 101 advert_int 1 authentication { auth_type PASS auth_pass kubevip } virtual_ipaddress { 192.168.1.200 } } EOFcat <<EOF | sudo tee /etc/keepalived/keepalived.conf vrrp_instance VI_1 { state MASTER interface eth0 virtual_router_id 51 priority 101 advert_int 1 authentication { auth_type PASS auth_pass kubevip } virtual_ipaddress { 192.168.1.200 } } EOFEm lb2 (BACKUP):cat <<EOF | sudo tee /etc/keepalived/keepalived.conf vrrp_instance VI_1 { state BACKUP interface eth0 virtual_router_id 51 priority 100 advert_int 1 authentication { auth_type PASS auth_pass kubevip } virtual_ipaddress { 192.168.1.200 } } EOFcat <<EOF | sudo tee /etc/keepalived/keepalived.conf vrrp_instance VI_1 { state BACKUP interface eth0 virtual_router_id 51 priority 100 advert_int 1 authentication { auth_type PASS auth_pass kubevip } virtual_ipaddress { 192.168.1.200 } } EOFSubstitua eth0 se o nome da sua interface for diferente (use “ip add” para conferir).Passo 6 – Iniciar o KeepalivedExecute em ambos:sudo systemctl restart keepalived sudo systemctl enable keepalivedsudo systemctl restart keepalived sudo systemctl enable keepalivedTestar o VIPDe outro host (ou mesmo do master), execute:ping 192.168.1.200ping 192.168.1.200Desligue o lb1 (temporariamente) e veja se o IP flutuante continua pingando via lb2.Ligue de novo e veja se ele reassume.Agora você pode iniciar instalando seu cluster kubernetes na Etapa 2 – Instalação do Cluster Kubernetes com kubeadm
