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02.Prerequisites-HA-LB-Configuration.md

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Prerequisite - HA LoadBalancer configuration

  • DO NOT USE THIS CONFIGURATION FOR PRODUCTION USE. THIS CONFIG IS FOR EDUCATIONAL PURPOSE ONLY

HA-Proxy Load Balancer cluster using Keepalived

We need a floating IP for the loadbalance which will move across two LB nodes when ever there is a node failure. HA-Proxy will be running on both hosts and will take over new connections from the node once folating IP become active on that node. In this way, we will have a highly available LoadBalancer for Kubernetes API communication.

1) Install & Configure HA-Proxy on both lb-01 and lb-02
sudo apt-get install haproxy hatop
sudo sed -i -e "s/ENABLED=1/ENABLED=0/g" /etc/default/haproxy
sudo mv /etc/haproxy/haproxy.cfg /etc/haproxy/haproxy.cfg-orig
  • Configure HA-Proxy to pass traffic to controller VMs
sudo vi /etc/haproxy/haproxy.cfg
  • Copy & paste below contents to the file
global
    log /var/lib/haproxy/dev/log local0 debug
    maxconn 2000
    user haproxy
    group haproxy
defaults
    log     global
    mode    http
    option  httplog
    option  dontlognull
    retries 3
    option redispatch
    timeout connect  5000
    timeout client  1000000000
    timeout server  1000000000
frontend k8s-api
  bind 192.168.78.220:6443
  bind 127.0.0.1:6443
  mode tcp
  option tcplog
  default_backend k8s-api

backend k8s-api
  mode tcp
  option tcplog
  option tcp-check
  balance source
  default-server inter 600s downinter 5s rise 2 fall 2 slowstart 60s maxconn 250 maxqueue 256 weight 100
  server controller-01 192.168.78.201:6443 check
  server controller-02 192.168.78.202:6443 check
  server controller-03 192.168.78.203:6443 check
2) Install & Configure Keepalived on both lb-01 and lb-02
sudo apt-get install keepalived
sudo bash -c 'echo "net.ipv4.ip_nonlocal_bind=1" >> /etc/sysctl.conf'
sudo sysctl -p
  • Configure keepalived to for an HA floating IP
sudo vi /etc/keepalived/keepalived.conf
  • Copy & paste below contents to the file
vrrp_script chk_haproxy {
        script "killall -0 haproxy"    
        interval 2                   
        weight 2   
}

vrrp_instance VI_1 {
        interface enp0s8
        state MASTER
        virtual_router_id 91
        priority 101        
        virtual_ipaddress {
            192.168.78.220/24
        }
        track_script {
            chk_haproxy
        }
}
  • Start keepalived service
sudo service keepalived start
  • Restart rsyslogd to start ha-proxy logging
sudo service rsyslog start

Part 3 - Install Client Tools