change value of localhost in all config files before running the router, don't check the network prefix, just use dockerenv

"127.0.0.1:7656:7656"
    "127.0.0.1:7657:7657" ...
    so those ports are only available on 127.0.0.1 on the host, this does not work with the standard delivered startapp.sh. All i2p ports inside the container must listen on 0.0.0.0 to be reachable from the host (on 127.0.0.1). Also my i2p-docker-network is on 172.21.x.x, so "grep 172.17." won't work.

Docker.md

@@ -28,6 +28,17 @@ docker build -t i2p .
 
 ### Running a container
 
+#### Environment Variables
+
+It is possible to set the IP address where the I2P router is accessible by setting
+the `IP_ADDR` environment variable in your `docker run` command or your `docker-compose`
+file. For example, if you want to make your I2P router listen on all addresses, then
+you should pass `-e IP_ADDR=0.0.0.0` to your `docker run` command.
+
+It is also possible to configure the memory available to the I2P router using
+environment variables. To do this, use the: `JVM_XMX` environment variable by passing,
+for example, `-e JVM_XMX=256m`.
+
 #### Volumes
 The container requires a volume for the configuration data to be mounted.  Optionally, you can mount a separate volume for torrent ("i2psnark") downloads.  See the example below.
 

docker/rootfs/startapp.sh

@@ -24,12 +24,13 @@ done
 
 if [ -f /.dockerenv ]; then
     echo "[startapp] Running in container"
+    if [ -z "$IP_ADDR" ]; then
         export IP_ADDR=$(hostname -i)
-    if echo "$IP_ADDR" | grep "172.17"; then
         echo "[startapp] Running in docker network"
-        sed -i "s/127.0.0.1/${IP_ADDR}/g" ./clients.config ./i2ptunnel.config
     fi
-
+    echo "[startapp] setting reachable IP to container IP $IP_ADDR"
+    find . -name '*.config' -exec sed -i "s/127.0.0.1/$IP_ADDR/g" {} \;
+    find . -name '*.config' -exec sed -i "s/localhost/$IP_ADDR/g" {} \;
 fi
 
 # Options required for reflective access in dynamic JVM languages like Groovy and Jython
@@ -38,4 +39,3 @@ JAVA17OPTS="--add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/su
 JAVAOPTS="-Djava.net.preferIPv4Stack=false -Djava.library.path=${I2P}:${I2P}/lib -Di2p.dir.base=${I2P} -Di2p.dir.config=${HOME}/.i2p -DloggerFilenameOverride=logs/log-router-@.txt -Xmx$JVM_XMX"
 
 java -cp "${CLASSPATH}" ${JAVA_OPTS} net.i2p.router.RouterLaunch
-