feat(sshd_config): let the sshd port to be changed using a env var

Dockerfile

@@ -1,6 +1,8 @@
 FROM debian:bullseye
 MAINTAINER Adrian Dvergsdal [atmoz.net]
 
+ENV SSHD_PORT 22
+
 # Steps done in one RUN layer:
 # - Install packages
 # - OpenSSH needs /var/run/sshd to run
@@ -15,6 +17,4 @@ COPY files/sshd_config /etc/ssh/sshd_config
 COPY files/create-sftp-user /usr/local/bin/
 COPY files/entrypoint /
 
-EXPOSE 22
-
 ENTRYPOINT ["/entrypoint"]

README.md

@@ -30,6 +30,8 @@ Easy to use SFTP ([SSH File Transfer Protocol](https://en.wikipedia.org/wiki/SSH
     own home directory, so make sure there are at least one subdirectory if you
     want them to upload files.
   - For consistent server fingerprint, mount your own host keys (i.e. `/etc/ssh/ssh_host_*`)
+- Override port
+  - The container will listen on the port 22 (default for sshd), but if for any reasons you want an another port to be used instead of the default, you can change it with the env var SSHD_PORT
 
 # Examples
 

files/entrypoint

@@ -90,6 +90,9 @@ if [ -d /etc/sftp.d ]; then
     unset f
 fi
 
+
+sed -i "s/SSHD_PORT/$SSHD_PORT/" /etc/ssh/sshd_config
+
 if $startSshd; then
     log "Executing sshd"
     exec /usr/sbin/sshd -D -e

files/sshd_config

@@ -20,3 +20,5 @@ ChrootDirectory %h
 
 # Enable this for more logs
 #LogLevel VERBOSE
+
+Port SSHD_PORT