extra config file

Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.15
+FROM alpine:3.18
 
 RUN \
   apk -U add rsyslog rsyslog-mmutf8fix
@@ -11,5 +11,8 @@ EXPOSE 514/udp
 ENV TARGET_HOST="127.0.0.1"
 ENV TARGET_PROTO="tcp"
 ENV TARGET_PORT="514"
+ENV DEBUG="0"
+
+VOLUME [ "/extraconfig" ]
 
 ENTRYPOINT ["/bin/sh", "/run.sh"]

README.md

@@ -15,10 +15,15 @@ docker build . -t docker.asperti.com/paspo/syslog-forwarder
 ## environment
 
 Variable      | Default   | Description
---------------|-----------|---------------------------
+--------------|-----------|----------------------------------------------------
  TARGET_HOST  | 127.0.0.1 | target server IP/hostname
  TARGET_PROTO | tcp       | `tcp` or `udp`
  TARGET_PORT  | 514       | target server syslog port
+ DEBUG        | 0         | if != 0, every received log line is shown on stdout
+
+## extra config files
+
+You can add some custom config file, by mounting the `/extraconfig` directory. Any file ending in `.conf` placed here will be added to rsyslog configuration.
 
 ## run
 

run.sh

@@ -9,6 +9,9 @@ TARGET_PROTO=${TARGET_PROTO:-tcp}
 # 514 is the common default
 TARGET_PORT=${TARGET_PORT:-514}
 
+# DEBUG MODE ENABLED if != 0
+DEBUG=${DEBUG:-0}
+
 cat >/etc/rsyslog.conf <<EOF
 \$WorkDirectory /var/lib/rsyslog
 
@@ -34,6 +37,13 @@ if (\$hostname == '') then set \$!hostname = \$fromhost;
 
 EOF
 
+if [ "${DEBUG}" != "0" ] ; then
+  cat >>/etc/rsyslog.conf <<EOF
+module(load="omstdout")
+action(type="omstdout")
+EOF
+fi
+
 if [ "${TARGET_PROTO}" = "udp" ] ; then
   cat >>/etc/rsyslog.conf <<EOF
 action(type="omfwd" protocol="udp" target="${TARGET_HOST}" port="${TARGET_PORT}" Template="RSYSLOG_SyslogRFC5424Format" )
@@ -44,4 +54,10 @@ action(type="omfwd" protocol="tcp" target="${TARGET_HOST}" port="${TARGET_PORT}"
 EOF
 fi
 
+# extra config
+mkdir -p /extraconfig
+cat >>/etc/rsyslog.conf <<EOF
+$IncludeConfig /etc/rsyslog.d/*.conf
+EOF
+
 /usr/sbin/rsyslogd -nf /etc/rsyslog.conf