haproxy-heartbeat-master-vip.sh

#!/usr/bin/env bash
# by casey siens
#RUN THIS AS ROOT. YOU MUST BE ABLE TO SSH TO EACH NODE AS ROOT! IGNORE THE RED WARNINGS WHEN THE SERVICES START DURING THE INSTALL!!! ALLOW THE SCRIPT TO FINISH!!!

#List of master node ips.
ha_master_ip_list="10.9.8.21 10.9.8.22 10.9.8.23"

#VIP for ha.
ha_vip="10.9.8.20"

#Create heartbeat preshared key. 
heartbeat_pw="heartbeatpa55word"

#Create ha folder.
mkdir /root/ha

#Create ha.authkeys file
authkey=$(echo -n ${heartbeat_pw} | md5sum | awk '{print $1}')
echo "auth 1" > /root/ha/ha.authkeys
echo "1 md5 "${authkey} >> /root/ha/ha.authkeys

#Create haresources file
ha_master_1st_ip=$(echo ${ha_master_ip_list} | awk '{print $1}')
ha_master_1st_hostname=$(ssh -l root ${ha_master_1st_ip} hostname)
echo ${ha_master_1st_hostname}" "${ha_vip} > /root/ha/haresources

#Create haproxy.cfg
cat << EOF >> /root/ha/haproxy.cfg
global
    user haproxy
    group haproxy
defaults
    mode http
    log global
    retries 2
    timeout connect 3000ms
    timeout server 5000ms
    timeout client 5000ms
frontend kubernetes
    bind ${ha_vip}:6443
    option tcplog
    mode tcp
    default_backend kubernetes-master-nodes
backend kubernetes-master-nodes
    mode tcp
    balance roundrobin
    option tcp-check
EOF

for host in ${ha_master_ip_list}; do
hostname=$(ssh -l root ${host} hostname)
echo "server "${hostname}" "${host}":6443 check fall 3 rise 2" >> /root/ha/haproxy.cfg
done

#Create heartbeat.cf files
for host in ${ha_master_ip_list}; do
hostname=$(ssh -l root ${host} hostname)
interface=$(ssh -l root ${host} ip -o -4 route show to default | awk '{print $5}')
cat << EOF >> /root/ha/heartbeat.${hostname}.cf
keepalive 2
deadtime 10
udpport        694
bcast  ${interface}
mcast ${interface} 225.0.0.1 694 1 0
ucast ${interface} ${host}
udp     ${interface}
logfacility     local0
EOF
for ha_host in ${ha_master_ip_list}; do
ha_name=$(ssh -l root ${ha_host} hostname)
echo "node    "${ha_name} >> /root/ha/heartbeat.${hostname}.cf
done
#Scp the ha.cf file to each master node
ssh -l root ${host} mkdir -p /etc/ha.d
scp /root/ha/heartbeat.${hostname}.cf root@${host}:/etc/ha.d/ha.cf
done

#Scp the other config files to each master node
for host in ${ha_master_ip_list}; do
ssh -l root ${host} mkdir -p /etc/haproxy
ssh -l root ${host} apt-get install -y haproxy heartbeat
scp /root/ha/haproxy.cfg root@${host}:/etc/haproxy/haproxy.cfg
scp /root/ha/ha.authkeys root@${host}:/etc/ha.d/authkeys
scp /root/ha/haresources root@${host}:/etc/ha.d/haresources
ssh -l root ${host} chmod 600 /etc/ha.d/authkeys
ssh -l root ${host} systemctl enable haproxy
ssh -l root ${host} systemctl start haproxy
ssh -l root ${host} systemctl enable heartbeat
ssh -l root ${host} systemctl start heartbeat
done

systemctl status haproxy