preprocess_dev.sh

# Time
yum -y install ntp
ntpdate time.apple.com

# remove old kernel
yum install yum-utils
package-cleanup --oldkernels --count=2

# disable ipv6
# append in file `/etc/sysctl.conf`
cat << EOF >> /etc/sysctl.conf
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
EOF
sysctl -w net.ipv6.conf.all.disable_ipv6=1
sysctl -w net.ipv6.conf.default.disable_ipv6=1


# remove ::1 in `etc/hosts`
sed '/::1/d' /etc/hosts
# append active interface to hostfile
ip addr show ens33 | grep -Po 'inet \K[\d.]+'
# append all interfaces ip to hosts
ip addr | grep -Po 'inet \K[\d.]+' |awk '{print $1 " localhost"}' >> /etc/hosts

# Disable firewalld and SElinux
systemctl disable firewalld && systemctl stop firewalld
sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config