Optimized Dockerfiles

1.Reduced layers.
2.Reduced size by clearing the cache and combining RUN layers.

Author: ilolm

ssh/baseline-configs/fedora+/Dockerfile

@@ -1,13 +1,19 @@
 FROM fedora:latest
 
-RUN dnf install -y openssh-server wget
+RUN dnf check-update || true && \
+    dnf install -y openssh-server wget && \
+    dnf clean all && \
 
-RUN sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config
-RUN sed -i 's/#AllowTcpForwarding yes/AllowTcpForwarding yes/' /etc/ssh/sshd_config
+    # Configuring ssh config
+    sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config && \
+    sed -i 's/#AllowTcpForwarding yes/AllowTcpForwarding yes/' /etc/ssh/sshd_config && \
 
-RUN ssh-keygen -A
+    # Generating ssh keys
+    ssh-keygen -A && \
 
-RUN echo "root:foobar" | chpasswd
+    # Changing root password
+    echo "root:foobar" | chpasswd
 
 EXPOSE 5670
-CMD ["/usr/sbin/sshd", "-D", "-p", "5670"]
+
+CMD ["/usr/sbin/sshd", "-D", "-p", "5670"]

ssh/baseline-configs/fedora/Dockerfile

@@ -1,15 +1,21 @@
 FROM fedora:latest
 
-RUN dnf install -y openssh-server
+RUN dnf check-update || true && \
+    dnf install -y openssh-server && \
+    dnf clean all && \
 
-RUN sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config
-RUN sed -i 's/#AllowTcpForwarding yes/AllowTcpForwarding yes/' /etc/ssh/sshd_config
+    # Configuring ssh config
+    sed -i 's/#PermitRootLogin prohibit-password/PermitRootLogin yes/' /etc/ssh/sshd_config && \
+    sed -i 's/#AllowTcpForwarding yes/AllowTcpForwarding yes/' /etc/ssh/sshd_config && \
 
-RUN ssh-keygen -A
+    # Generating ssh keys
+    ssh-keygen -A && \
 
-RUN echo "root:foobar" | chpasswd
+    # Changing root password
+    echo "root:foobar" | chpasswd
 
 # TODO: expose only on an isolated docker network to avoid conflicts?
 #       Think about how extension would communicate
 EXPOSE 5671
-CMD ["/usr/sbin/sshd", "-D", "-p", "5671"]
+
+CMD ["/usr/sbin/sshd", "-D", "-p", "5671"]