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