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sandervanvugt
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setup-lb-ubuntu.sh
Executable file
145
setup-lb-ubuntu.sh
Executable file
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#!/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 0.7
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# currently only tested on Ubuntu 22.04 LTS Server
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# run this AFTER running setup-container.sh and setup-kubetools.sh
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#
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# TODO: remove the many password prompts
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if which kubectl
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then
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echo all good moving on
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else
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echo please run setup-container.sh and setup-kubetools.sh first and then run this again
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exit 6
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fi
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## establish key based SSH with remote hosts
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# obtain node information
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if grep control1 /etc/hosts | grep -v 127
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then
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export CONTROL1_IP=$(awk '/control1/ { print $1 }' /etc/hosts | grep -v 127)
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else
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echo enter IP address for control1
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read CONTROL1_IP
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export CONTROL1_IP=$CONTROL1_IP
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sudo sh -c "echo $CONTROL1_IP control1 >> /etc/hosts"
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fi
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if grep control2 /etc/hosts | grep -v 127
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then
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export CONTROL2_IP=$(awk '/control2/ { print $1 }' /etc/hosts | grep -v 127)
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else
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echo enter IP address for control2
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read CONTROL2_IP
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export CONTROL2_IP=$CONTROL2_IP
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sudo sh -c "echo $CONTROL2_IP control2 >> /etc/hosts"
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fi
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if grep control3 /etc/hosts | grep -v 127
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then
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export CONTROL3_IP=$(awk '/control3/ { print $1 }' /etc/hosts | grep -v 127)
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else
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echo enter IP address for control3
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read CONTROL3_IP
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export CONTROL3_IP=$CONTROL3_IP
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sudo sh -c "echo $CONTROL3_IP control3 >> /etc/hosts"
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fi
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echo ##### READ ALL OF THIS BEFORE CONTINUING ######
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echo this script requires you to run setup-container.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 192.168.29.100
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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 also change the IP address in keepalived.conf
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echo .
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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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# 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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# configuring sudo for easier access
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sudo sh -c "echo 'Defaults timestamp_type=global,timestamp_timeout=60' >> /etc/sudoers"
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sudo scp -p /etc/sudoers student@control2:/tmp/ && ssh -t control2 'sudo -S chown root:root /tmp/sudoers' && ssh -t control2 'sudo -S cp -p /tmp/sudoers /etc/'
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sudo scp -p /etc/sudoers student@control3:/tmp/ && ssh -t control3 'sudo -S chown root:root /tmp/sudoers' && ssh -t control3 'sudo -S cp -p /tmp/sudoers /etc/'
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#ssh control2 sudo -S sh -c "echo 'Defaults timestamp_type=global,timestamp_timeout=60' >> /etc/sudoers"
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#ssh control3 sudo -S sh -c "echo 'Defaults timestamp_type=global,timestamp_timeout=60' >> /etc/sudoers"
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# install required software
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sudo apt install haproxy keepalived -y
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ssh control2 "sudo -S apt install haproxy keepalived -y"
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ssh control3 "sudo -S apt install haproxy keepalived -y"
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scp /etc/hosts control2:/tmp && ssh -t control2 'sudo -S cp /tmp/hosts /etc/'
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scp /etc/hosts control3:/tmp && ssh -t control3 'sudo -S cp /tmp/hosts /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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sudo chmod +x check_apiserver.sh
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sudo cp check_apiserver.sh /etc/keepalived/
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scp check_apiserver.sh control2:/tmp && ssh -t control2 'sudo -S cp /tmp/check_apiserver.sh /etc/keepalived'
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scp check_apiserver.sh control3:/tmp && ssh -t control3 'sudo -S cp /tmp/check_apiserver.sh /etc/keepalived'
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#### creating site specific keepalived.conf file
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sudo cp keepalived.conf keepalived-control2.conf
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sudo cp keepalived.conf keepalived-control3.conf
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sudo sed -i 's/state MASTER/state SLAVE/' keepalived-control2.conf
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sudo sed -i 's/state MASTER/state SLAVE/' keepalived-control3.conf
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sudo sed -i 's/priority 255/priority 254/' keepalived-control2.conf
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sudo sed -i 's/priority 255/priority 253/' keepalived-control3.conf
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sudo cp keepalived.conf /etc/keepalived/
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scp keepalived-control2.conf control2:/tmp && ssh -t control2 'sudo -S cp /tmp/keepalived-control2.conf /etc/keepalived/keepalived.conf'
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scp keepalived-control3.conf control3:/tmp && ssh -t control3 'sudo -S cp /tmp/keepalived-control3.conf /etc/keepalived/keepalived.conf'
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echo DEBUG check if files are copied over successfully
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read
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### rewriting haproxy.cfg with site specific IP addresses
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sudo sed -i s/server\ control1\ 1.1.1.1\:6443\ check/server\ control1\ $CONTROL1_IP\:6443\ check/ haproxy.cfg
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sudo sed -i s/server\ control2\ 1.1.1.2\:6443\ check/server\ control2\ $CONTROL2_IP\:6443\ check/ haproxy.cfg
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sudo sed -i s/server\ control3\ 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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sudo cp haproxy.cfg /etc/haproxy/
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scp haproxy.cfg control2:/tmp && ssh -t control2 'sudo -S cp /tmp/haproxy.cfg /etc/haproxy/'
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scp haproxy.cfg control3:/tmp && ssh -t control3 'sudo -S cp /tmp/haproxy.cfg /etc/haproxy/'
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echo DEBUG check if haproxy files are copied over successfully
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read
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# start and enable services
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sudo systemctl enable keepalived --now
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sudo systemctl enable haproxy --now
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ssh control2 sudo -S systemctl enable keepalived --now
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ssh control2 sudo -S systemctl enable haproxy --now
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ssh control3 sudo -S systemctl enable keepalived --now
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ssh control3 sudo -S systemctl enable haproxy --now
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echo setup is now done, please verify
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echo the first node that started the services - normally control1 - should run the virtual IP address 192.168.29.100
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@ -19,13 +19,13 @@ metadata:
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spec:
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selector:
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matchLabels:
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app: nginx # has to match .spec.template.metadata.labels
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app: nginx
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serviceName: "nginx"
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replicas: 3 # by default is 1
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replicas: 3
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template:
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metadata:
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labels:
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app: nginx # has to match .spec.selector.matchLabels
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app: nginx
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spec:
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terminationGracePeriodSeconds: 10
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containers:
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