The following instructions
tar -z -x -f /tmp/easyrsa.tar.gz
# Configuration parameters
cat << EOF > /etc/profile.d/easy-rsa.sh
export EASYRSA_PKI="${VPN_PKI}"
export EASYRSA_TEMP_DIR="/tmp"
export EASYRSA_CERT_EXPIRE="3650"
export EASYRSA_BATCH="1"
alias easyrsa="/root/EasyRSA-3.1.7/easyrsa"
EOF
. /etc/profile.d/easy-rsa.sh
install failed, In my case, tar command placed files in /tmp but the alias points to /root.