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completed HA setup script

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This commit is contained in:
Sander van Vugt 2020-11-04 09:22:09 +01:00
parent 39d19e9e19
commit 3a9e7ab192
6 changed files with 212 additions and 142 deletions
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12
check_apiserver.sh Executable file
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@ -0,0 +1,12 @@
APISERVER_VIP=192.168.4.100
APISERVER_DEST_PORT=6443
errorExit() {
echo "* * * $*" 1>&2
exit 1
}
curl --silent --max-time 2 --insecure https://localhost:${APISERVER_DEST_PORT}/ -o /dev/null || errorExit "Error GET https://localhost:${APISERVER_DEST_PORT}/"
if ip addr | grep -q ${APISERVER_VIP}; then
curl --silent --max-time 2 --insecure https://${APISERVER_VIP}:${APISERVER_DEST_PORT}/ -o /dev/null || errorExit "Error GET https://${APISERVER_VIP}:${APISERVER_DEST_PORT}/"
fi

82
haproxy.cfg Normal file
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@ -0,0 +1,82 @@
#---------------------------------------------------------------------
# Example configuration for a possible web application. See the
# full configuration options online.
#
# http://haproxy.1wt.eu/download/1.4/doc/configuration.txt
#
#---------------------------------------------------------------------
#---------------------------------------------------------------------
# Global settings
#---------------------------------------------------------------------
global
# to have these messages end up in /var/log/haproxy.log you will
# need to:
#
# 1) configure syslog to accept network log events. This is done
# by adding the '-r' option to the SYSLOGD_OPTIONS in
# /etc/sysconfig/syslog
#
# 2) configure local2 events to go to the /var/log/haproxy.log
# file. A line like the following can be added to
# /etc/sysconfig/syslog
#
# local2.* /var/log/haproxy.log
#
log 127.0.0.1 local2
chroot /var/lib/haproxy
pidfile /var/run/haproxy.pid
maxconn 4000
user haproxy
group haproxy
daemon
# turn on stats unix socket
stats socket /var/lib/haproxy/stats
#---------------------------------------------------------------------
# common defaults that all the 'listen' and 'backend' sections will
# use if not designated in their block
#---------------------------------------------------------------------
defaults
mode http
log global
option httplog
option dontlognull
option http-server-close
option forwardfor except 127.0.0.0/8
option redispatch
retries 3
timeout http-request 10s
timeout queue 1m
timeout connect 10s
timeout client 1m
timeout server 1m
timeout http-keep-alive 10s
timeout check 10s
maxconn 3000
#---------------------------------------------------------------------
# main frontend which proxys to the backends
#---------------------------------------------------------------------
#---------------------------------------------------------------------
# apiserver frontend which proxys to the masters
#---------------------------------------------------------------------
frontend apiserver
bind *:8443
mode tcp
option tcplog
default_backend apiserver
#---------------------------------------------------------------------
# round robin balancing for apiserver
#---------------------------------------------------------------------
backend apiserver
option httpchk GET /healthz
http-check expect status 200
mode tcp
option ssl-hello-chk
balance roundrobin
server control1 1.1.1.1:6443 check
server control2 1.1.1.2:6443 check
server control3 1.1.1.3:6443 check

29
keepalived.conf Normal file
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! /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
}
vrrp_script check_apiserver {
script "/etc/keepalived/check_apiserver.sh"
interval 3
weight -2
fall 10
rise 2
}
vrrp_instance VI_1 {
state MASTER
interface ens33
virtual_router_id 151
priority 255
authentication {
auth_type PASS
auth_pass Password
}
virtual_ipaddress {
192.168.4.100/24
}
track_script {
check_apiserver
}
}

16
kube-setup.sh
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@ -1,8 +1,8 @@
#!/bin/bash
#
# verified on Fedora 31 and Ubuntu LTS 20.04
# verified on Fedora 31, 33 and Ubuntu LTS 20.04
echo this script works on Fedora 31 and Ubuntu 20.04
echo this script works on Fedora 31, 33 and Ubuntu 20.04
echo it does NOT currently work on Fedora 32
echo it requires the machine where you run it to have 6GB of RAM or more
echo press Enter to continue
@ -20,11 +20,11 @@ echo MYOS is set to $MYOS
#### Fedora config
if [ $MYOS = "Fedora" ]
then
#if [ $OSVERSION = 32 ]
#then
# echo Fedora 32 is not currently supported
# exit 9
#fi
if [ $OSVERSION = 32 ]
then
echo Fedora 32 is not currently supported
exit 9
fi
sudo dnf clean all
sudo dnf -y upgrade
@ -62,3 +62,5 @@ sudo mv minikube /usr/local/bin
# start minikube
minikube start --memory 4096 --vm-driver=kvm2
echo if this script ends with an error, restart the virtual machine
echo and manually run minikube start --memory 4096 --vm-driver=kvm2

9
setup-docker.sh
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@ -25,15 +25,6 @@ cat > /etc/docker/daemon.json <<EOF
}
EOF
cat >> /etc/hosts << EOF
{
192.168.4.110 control.example.com control
192.168.4.111 worker1.example.com worker1
192.168.4.112 worker2.example.com worker2
192.168.4.113 worker3.example.com worker3
}
EOF
mkdir -p /etc/systemd/system/docker.service.d
systemctl daemon-reload

206
setup-lb.sh
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@ -1,146 +1,100 @@
#!/bin/bash
#
# echo script to set up load balancing on cluster nodes
# 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 0.1 - may be buggy!
# version 0.5
# currently only supporting CentOS 7.x
# run this AFTER running setup-docker.sh and setup-kubetools.sh
# read and try to udnerstand before running this!
## 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
echo enter the IP address for control2
read CONTROL2_IP
echo enter the IP address for control3
read 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
echo $CONTROL1_IP control1 >> /etc/hosts
echo $CONTROL2_IP control2 >> /etc/hosts
echo $CONTROL3_IP control3 >> /etc/hosts
# generating and distributing SSH keys
ssh-keygen
ssh-copy-id control1
ssh-copy-id control2
ssh-copy-id control3
# install required software
yum install haproxy keepalived -y
ssh control2 "yum install haproxy keepalived -y"
ssh control3 "yum install haproxy keepalived -y"
# copying /etc/hosts file
scp /etc/hosts control2:/etc/
scp /etc/hosts control3:/etc/
# create keepalived config
# change IP address to anything that works in your environment!
cat << EOF >> /etc/keepalived/check_apiserver.sh
APISERVER_VIP=192.168.4.100
APISERVER_DEST_PORT=6443
chmod +x check_apiserver.sh
cp check_apiserver.sh /etc/keepalived/
scp check_apiserver.sh control2:/etc/keepalived/
scp check_apiserver.sh control3:/etc/keepalived/
errorExit() {
echo "* * * $*" 1>&2
exit 1
}
#### creating site specific keepalived.conf file
cp keepalived.conf keepalived-control2.conf
cp keepalived.conf keepalived-control3.conf
curl --silent --max-time 2 --insecure https://localhost:${APISERVER_DEST_PORT}/ -o /dev/null || errorExit "Error GET https://localhost:${APISERVER_DEST_PORT}/"
if ip addr | grep -q ${APISERVER_VIP}; then
curl --silent --max-time 2 --insecure https://${APISERVER_VIP}:${APISERVER_DEST_PORT}/ -o /dev/null || errorExit "Error GET https://${APISERVER_VIP}:${APISERVER_DEST_PORT}/"
EOF
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
#### creating second script, make sure to change IP addresses!
cp keepalived.conf /etc/keepalived/
scp keepalived-control2.conf control2:/etc/keepalived/keepalived.conf
scp keepalived-control3.conf control3:/etc/keepalived/keepalived.conf
cat << EOF >> /etc/keepalived/keepalived.conf
! /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
}
vrrp_script check_apiserver {
script "/etc/keepalived/check_apiserver.sh"
interval 3
weight -2
fall 10
rise 2
}
### 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\ control1\ 1.1.1.2\:6443\ check/server\ control2\ $CONTROL2_IP\:6443\ check/ haproxy.cfg
sed -i s/server\ control1\ 1.1.1.3\:6443\ check/server\ control3\ $CONTROL3_IP\:6443\ check/ haproxy.cfg
vrrp_instance VI_1 {
state MASTER
interface ens33
virtual_router_id 151
priority 255
authentication {
auth_type PASS
auth_pass Password
}
virtual_ipaddress {
192.168.4.100/24
}
track_script {
check_apiserver
}
}
EOF
chmod +x /etc/keepalived/check_apiserver.sh
### setting up haproxy
echo > /etc/haproxy/haproxy.cfg
cat << EOF >> /etc/haproxy/haproxy.cfg
# /etc/sysconfig/syslog
#
# local2.* /var/log/haproxy.log
#
log 127.0.0.1 local2
chroot /var/lib/haproxy
pidfile /var/run/haproxy.pid
maxconn 4000
user haproxy
group haproxy
daemon
# turn on stats unix socket
stats socket /var/lib/haproxy/stats
#---------------------------------------------------------------------
# common defaults that all the 'listen' and 'backend' sections will
# use if not designated in their block
#---------------------------------------------------------------------
defaults
mode http
log global
option httplog
option dontlognull
option http-server-close
option forwardfor except 127.0.0.0/8
option redispatch
retries 3
timeout http-request 10s
timeout queue 1m
timeout connect 10s
timeout client 1m
timeout server 1m
timeout http-keep-alive 10s
timeout check 10s
maxconn 3000
#---------------------------------------------------------------------
# main frontend which proxys to the backends
#---------------------------------------------------------------------
#---------------------------------------------------------------------
# apiserver frontend which proxys to the masters
#---------------------------------------------------------------------
frontend apiserver
bind *:8443
mode tcp
option tcplog
default_backend apiserver
#---------------------------------------------------------------------
# round robin balancing for apiserver
#---------------------------------------------------------------------
backend apiserver
option httpchk GET /healthz
http-check expect status 200
mode tcp
option ssl-hello-chk
balance roundrobin
server control1 192.168.4.87:6443 check
server control2 192.168.4.88:6443 check
server control3 192.168.4.89:6443 check
EOF
echo enter IP address of second HA node
read SECONDNODE
echo enter IP address of third HA node
read THIRDNODE
# copy haproxy.cfg to destinations
cp haproxy.cfg /etc/haproxy/
scp haproxy.cfg control2:/etc/haproxy/
scp haproxy.cfg control3:/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 now edit the keepalived.conf file on $SECONDNODE and $THIRDNODE
echo change "state MASTER" to "state SLAVE"
echo set priority to 254 on $SECONDNODE and 253 on $THIRDNODE
echo and use systemctl to enable --now keepalived and haproxy services
echo I will automate this in a later version of this script
for i in $SECONDNODE $THIRDNODE; do scp /etc/keepalived/check_apiserver.sh /etc/keepalived/keepalived.conf root@$i:/etc/keepalived; scp /etc/haproxy/haproxy.cfg root@$i:/etc/haproxy; done
echo setup is now done, please verify
echo control1 should run the virtual IP address 192.168.4.100