Use Alpine Linux to reduce size by 70%

Dockerfile

@@ -1,33 +1,15 @@
-FROM debian:jessie
+FROM alpine:3.4
 MAINTAINER David Personette <dperson@gmail.com>
 
 # Install samba
-RUN export DEBIAN_FRONTEND='noninteractive' && \
-    apt-get update -qq && \
-    apt-get install -qqy --no-install-recommends samba \
-                $(apt-get -s dist-upgrade|awk '/^Inst.*ecurity/ {print $2}') &&\
-    useradd -c 'Samba User' -d /tmp -M -r smbuser && \
-    sed -i 's|^\(   log file = \).*|\1/dev/stdout|' /etc/samba/smb.conf && \
-    sed -i 's|^\(   unix password sync = \).*|\1no|' /etc/samba/smb.conf && \
-    sed -i '/Share Definitions/,$d' /etc/samba/smb.conf && \
-    echo '   security = user' >>/etc/samba/smb.conf && \
-    echo '   directory mask = 0775' >>/etc/samba/smb.conf && \
-    echo '   force create mode = 0664' >>/etc/samba/smb.conf && \
-    echo '   force directory mode = 0775' >>/etc/samba/smb.conf && \
-    echo '   force user = smbuser' >>/etc/samba/smb.conf && \
-    echo '   force group = users' >>/etc/samba/smb.conf && \
-    echo '   load printers = no' >>/etc/samba/smb.conf && \
-    echo '   printing = bsd' >>/etc/samba/smb.conf && \
-    echo '   printcap name = /dev/null' >>/etc/samba/smb.conf && \
-    echo '   disable spoolss = yes' >>/etc/samba/smb.conf && \
-    echo '   socket options = TCP_NODELAY' >>/etc/samba/smb.conf && \
-    echo '' >>/etc/samba/smb.conf && \
-    apt-get clean && \
-    rm -rf /var/lib/apt/lists/* /tmp/*
+RUN apk add --no-cache samba bash && \
+    adduser -h /tmp -H -S smbuser && \
+    rm -rf /tmp/*
 COPY samba.sh /usr/bin/
+COPY smb.conf /etc/samba
 
 VOLUME ["/etc/samba"]
 
 EXPOSE 137 139 445
 
-ENTRYPOINT ["samba.sh"]
+ENTRYPOINT ["samba.sh"]

samba.sh

@@ -171,4 +171,4 @@ elif ps -ef | egrep -v grep | grep -q smbd; then
 else
     [[ ${NMBD:-""} ]] && ionice -c 3 nmbd -D
     exec ionice -c 3 smbd -FS </dev/null
-fi
+fi

smb.conf

@@ -0,0 +1,29 @@
+[global]
+   workgroup = WORKGROUP
+   dns proxy = no
+   log file = /dev/stdout
+   max log size = 1000
+   syslog = 0
+   panic action = /usr/share/samba/panic-action %d
+   server role = standalone server
+   passdb backend = tdbsam
+   obey pam restrictions = yes
+   unix password sync = no
+   passwd program = /usr/bin/passwd %u
+   passwd chat = *Enter\snew\s*\spassword:* %n\n *Retype\snew\s*\spassword:* %n\n *password\supdated\ssuccessfully* .
+   pam password change = yes
+   map to guest = bad user
+   usershare allow guests = yes
+
+   security = user
+   directory mask = 0775
+   force create mode = 0664
+   force directory mode = 0775
+   force user = smbuser
+   force group = users
+   load printers = no
+   printing = bsd
+   printcap name = /dev/null
+   disable spoolss = yes
+   socket options = TCP_NODELAY
+