Update Dockerfile

Dockerfile

@@ -1,24 +1,25 @@
-# Original credit: https://github.com/jpetazzo/dockvpn
-
-# Smallest base image
-FROM alpine:latest
-
-LABEL maintainer="Kyle Manna <kyle@kylemanna.com>"
-
-# Needed by scripts
-ENV OPENVPN=/etc/openvpn
-ENV EASYRSA=/usr/share/easy-rsa \
-    EASYRSA_CRL_DAYS=3650 \
-    EASYRSA_PKI=$OPENVPN/pki
-
-VOLUME ["/etc/openvpn"]
-
-# Internally uses port 1194/udp, remap using `docker run -p 443:1194/tcp`
+FROM debian:stable-slim
+
+# Install OpenVPN and Easy-RSA
+RUN apt-get update && \
+    apt-get install -y openvpn easy-rsa iptables && \
+    rm -rf /var/lib/apt/lists/*
+
+# Set up configuration files and keys
+COPY ./openvpn-server.conf /etc/openvpn/server.conf
+COPY ./vars /etc/openvpn/vars
+
+# Initialize Easy-RSA PKI
+RUN make-cadir /etc/openvpn/vars && \
+    cd /etc/openvpn/vars && \
+    . ./vars && \
+    ./clean-all && \
+    ./build-ca --batch && \
+    ./build-key-server --batch server && \
+    ./build-dh --batch
+
+# Expose port 1194 for OpenVPN
 EXPOSE 1194/udp
 
-CMD ["ovpn_run"]
-
-ADD ./bin /usr/local/bin
-RUN chmod a+x /usr/local/bin/*
-
-# Add support for OTP authentication using a PAM module
+# Run OpenVPN server
+CMD ["openvpn", "--config", "/etc/openvpn/server.conf"]