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setup-lb-ubuntu-alpha.sh

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+#!/bin/bash
+#
+# source https://github.com/sandervanvugt/cka/setup-lb.sh
+
+# script to set up load balancing on cluster nodes
+# for use in CKA courses by Sander van Vugt
+# version 0.5
+# currently only supporting CentOS 7.x
+# run this AFTER running setup-docker.sh and setup-kubetools.sh
+
+## establish key based SSH with remote hosts
+# obtain node information
+echo this script requires three nodes: control1 control2 and control3
+echo enter the IP address for control1
+read CONTROL1_IP
+export CONTROL1_IP=$CONTROL1_IP
+echo enter the IP address for control2
+read CONTROL2_IP
+export CONTROL2_IP=$CONTROL2_IP
+echo enter the IP address for control3
+read CONTROL3_IP
+export CONTROL3_IP=$CONTROL3_IP
+echo ##### READ ALL OF THIS BEFORE CONTINUING ######
+echo this script requires you to run setup-docker.sh and setup-kubetools.sh first
+echo this script is based on the NIC name ens33
+echo if your networkcard has a different name, edit keepalived.conf
+echo before continuing and change "interface ens33" to match your config
+echo .
+echo this script will create a keepalived apiserver at 192.168.4.100
+echo if this IP address does not match your network configuration,
+echo manually change the check_apiserver.sh file before continuing
+echo press enter to continue or Ctrl-c to interrupt and apply modifications
+read
+
+# performing check on critical files
+for i in keepalived.conf check_apiserver.sh haproxy.cfg
+do
+	if [ ! -f $i ]
+	then
+		echo $i should exist in the current directory && exit 2
+	fi
+done
+
+# create /etc/hosts for all nodes
+sudo sh -c 'echo $CONTROL1_IP control1 >> /etc/hosts'
+sudo sh -c 'echo $CONTROL2_IP control2 >> /etc/hosts'
+sudo sh -c 'echo $CONTROL3_IP control3 >> /etc/hosts'
+
+cat /etc/hosts
+
+echo this is the main thing that goes wrong: if it does, manually edit /etc/hosts on all the nodes and run the rest of the script
+read
+
+# generating and distributing SSH keys
+ssh-keygen
+ssh-copy-id control1
+ssh-copy-id control2
+ssh-copy-id control3
+
+# install required software
+sudo apt install haproxy keepalived -y
+ssh control2 "sudo apt install haproxy keepalived -y"
+ssh control3 "sudo apt install haproxy keepalived -y"
+
+scp /etc/hosts control2:/tmp && ssh -t control2 'sudo cp /tmp/hosts /etc/'
+scp /etc/hosts control3:/tmp && ssh -t control3 'sudo cp /tmp/hosts /etc/'
+
+# create keepalived config
+# change IP address to anything that works in your environment!
+chmod +x check_apiserver.sh
+cp check_apiserver.sh /etc/keepalived/
+
+
+scp check_apiserver.sh control2:/tmp && ssh -t control2 'sudo cp /tmp/check_apiserver.sh /etc/keepalived'
+scp check_apiserver.sh control3:/tmp && ssh -t control3 'sudo cp /tmp/check_apiserver.sh /etc/keepalived'
+
+#### creating site specific keepalived.conf file
+cp keepalived.conf keepalived-control2.conf
+cp keepalived.conf keepalived-control3.conf
+
+sed -i 's/state MASTER/state SLAVE/' keepalived-control2.conf
+sed -i 's/state MASTER/state SLAVE/' keepalived-control3.conf
+sed -i 's/priority 255/priority 254/' keepalived-control2.conf
+sed -i 's/priority 255/priority 253/' keepalived-control3.conf
+
+cp keepalived.conf /etc/keepalived/
+scp keepalived-control2.conf control2:/tmp && ssh -t control2 'sudo cp /tmp/keepalived-control2.conf /etc/keepalived/keepalived.conf'
+scp keepalived-control3.conf control3:/tmp && ssh -t control3 'sudo cp /tmp/keepalived-control3.conf /etc/keepalived/keepalived.conf'
+
+### rewriting haproxy.cfg with site specific IP addresses
+sed -i s/server\ control1\ 1.1.1.1\:6443\ check/server\ control1\ $CONTROL1_IP\:6443\ check/ haproxy.cfg
+sed -i s/server\ control2\ 1.1.1.2\:6443\ check/server\ control2\ $CONTROL2_IP\:6443\ check/ haproxy.cfg
+sed -i s/server\ control3\ 1.1.1.3\:6443\ check/server\ control3\ $CONTROL3_IP\:6443\ check/ haproxy.cfg
+
+# copy haproxy.cfg to destinations
+cp haproxy.cfg /etc/haproxy/
+scp haproxy.cfg control2:/tmp && ssh -t control2 'sudo cp /tmp/haproxy.cfg /etc/haproxy/'
+scp haproxy.cfg control3:/tmp && ssh -t control3 'sudo cp /tmp/haproxy.cfg /etc/haproxy/'
+
+# start and enable services
+systemctl enable keepalived --now
+systemctl enable haproxy --now
+ssh control2 systemctl enable keepalived --now
+ssh control2 systemctl enable haproxy --now
+ssh control3 systemctl enable keepalived --now
+ssh control3 systemctl enable haproxy --now
+
+echo setup is now done, please verify
+echo the first node that started the services - normally control1 -  should run the virtual IP address 192.168.29.100