Docker: Entrypoint shell script ignoring updated config file - docker

Question

I am running docker 17.03.0-ce on premise on an RHEL 7.3 64bit VM. I am pulling a weblogic 10.3.6 RHEL image and after that i modify weblogic domain config file which is required to run my application by passing the IP of the VM during docker run with the command "VM_IP=$(hostname -i)".So i have added sed command in the docker file along with server start script which replaces placeholder with VM IP in the config file. However, when the server starts, the config file seems to revert back to its original state, i.e. without the placeholder value getting replaced. I have observed that if i comment the server start script, the placeholder gets replaced with the proper. I tried executing the sed from a shell script which is the entry point and also tried running sed command from dockerfile.
Below is my docker file
FROM 192.168.1.1:5000/wcp_image:v6
WORKDIR /
USER root
ENV VM_IP=$vm_ip
RUN rm -rf
/data/Oracle/Middleware/user_projects/domains/WCP_DOMAIN/config/config.xml
COPY config.xml
/data/Oracle/Middleware/user_projects/domains/WCP_DOMAIN/config/
RUN chmod 777
/data/Oracle/Middleware/user_projects/domains/WCP_DOMAIN/config/config.xml &&
chown -R wcpuser.wcpuser
/data/Oracle/Middleware/user_projects/domains/WCP_DOMAIN/config/config.xml
COPY replace.sh /data/docker_setup
RUN chmod 777 /data/docker_setup/replace.sh
ENTRYPOINT ["/data/docker_setup/replace.sh"]
CMD ["$VM_IP"]
And below is the replace.sh shell script
#!/bin/bash
cd /data/Oracle/Middleware/user_projects/domains/WCP_DOMAIN/config
sed -i -r "s/VM_IP/$VM_IP/g"
/data/Oracle/Middleware/user_projects/domains/WCP_DOMAIN/config/config.xml
/data/Oracle/Middleware/user_projects/domains/WCP_DOMAIN/bin/startWebLogic.sh
Please let me know. Thanks in advance.
Update
Below is the startWeblogic.sh script from the container
#!/bin/sh
# WARNING: This file is created by the Configuration Wizard.
# Any changes to this script may be lost when adding extensions to this configuration.
# --- Start Functions ---
stopAll()
{
# We separate the stop commands into a function so we are able to use the trap command in Unix (calling a function) to stop these services
if [ "X${ALREADY_STOPPED}" != "X" ] ; then
exit
fi
# STOP DERBY (only if we started it)
if [ "${DERBY_FLAG}" = "true" ] ; then
echo "Stopping Derby server..."
${WL_HOME}/common/derby/bin/stopNetworkServer.sh >"${DOMAIN_HOME}/derbyShutdown.log" 2>&1
echo "Derby server stopped."
fi
ALREADY_STOPPED="true"
}
classCaching()
{
echo "Class caching enabled..."
JAVA_OPTIONS="${JAVA_OPTIONS} -Dlaunch.main.class=${SERVER_CLASS} -Dlaunch.class.path="${CLASSPATH}" -Dlaunch.complete=weblogic.store.internal.LockManagerImpl -cp ${WL_HOME}/server/lib/pcl2.jar"
export JAVA_OPTIONS
SERVER_CLASS="com.oracle.classloader.launch.Launcher"
}
# --- End Functions ---
# *************************************************************************
# This script is used to start WebLogic Server for this domain.
#
# To create your own start script for your domain, you can initialize the
# environment by calling #USERDOMAINHOME/setDomainEnv.
#
# setDomainEnv initializes or calls commEnv to initialize the following variables:
#
# BEA_HOME - The BEA home directory of your WebLogic installation.
# JAVA_HOME - Location of the version of Java used to start WebLogic
# Server.
# JAVA_VENDOR - Vendor of the JVM (i.e. BEA, HP, IBM, Sun, etc.)
# PATH - JDK and WebLogic directories are added to system path.
# WEBLOGIC_CLASSPATH
# - Classpath needed to start WebLogic Server.
# PATCH_CLASSPATH - Classpath used for patches
# PATCH_LIBPATH - Library path used for patches
# PATCH_PATH - Path used for patches
# WEBLOGIC_EXTENSION_DIRS - Extension dirs for WebLogic classpath patch
# JAVA_VM - The java arg specifying the VM to run. (i.e.
# - server, -hotspot, etc.)
# USER_MEM_ARGS - The variable to override the standard memory arguments
# passed to java.
# PRODUCTION_MODE - The variable that determines whether Weblogic Server is started in production mode.
# DERBY_HOME - Derby home directory.
# DERBY_CLASSPATH
# - Classpath needed to start Derby.
#
# Other variables used in this script include:
# SERVER_NAME - Name of the weblogic server.
# JAVA_OPTIONS - Java command-line options for running the server. (These
# will be tagged on to the end of the JAVA_VM and
# MEM_ARGS)
# CLASS_CACHE - Enable class caching of system classpath.
#
# For additional information, refer to "Managing Server Startup and Shutdown for Oracle WebLogic Server"
# (http://download.oracle.com/docs/cd/E17904_01/web.1111/e13708/overview.htm).
# *************************************************************************
umask 037
# Call setDomainEnv here.
DOMAIN_HOME="/data/Oracle/Middleware/user_projects/domains/WCP_DOMAIN"
. ${DOMAIN_HOME}/bin/setDomainEnv.sh $*
SAVE_JAVA_OPTIONS="${JAVA_OPTIONS}"
SAVE_CLASSPATH="${CLASSPATH}"
# Start Derby
DERBY_DEBUG_LEVEL="0"
if [ "${DERBY_FLAG}" = "true" ] ; then
${WL_HOME}/common/derby/bin/startNetworkServer.sh >"${DOMAIN_HOME}/derby.log" 2>&1
fi
JAVA_OPTIONS="${SAVE_JAVA_OPTIONS}"
SAVE_JAVA_OPTIONS=""
CLASSPATH="${SAVE_CLASSPATH}"
SAVE_CLASSPATH=""
trap 'stopAll' 1 2 3 15
if [ "${PRODUCTION_MODE}" = "true" ] ; then
WLS_DISPLAY_MODE="Production"
else
WLS_DISPLAY_MODE="Development"
fi
if [ "${WLS_USER}" != "" ] ; then
JAVA_OPTIONS="${JAVA_OPTIONS} -Dweblogic.management.username=${WLS_USER}"
fi
if [ "${WLS_PW}" != "" ] ; then
JAVA_OPTIONS="${JAVA_OPTIONS} -Dweblogic.management.password=${WLS_PW}"
fi
if [ "${MEDREC_WEBLOGIC_CLASSPATH}" != "" ] ; then
if [ "${CLASSPATH}" != "" ] ; then
CLASSPATH="${CLASSPATH}${CLASSPATHSEP}${MEDREC_WEBLOGIC_CLASSPATH}"
else
CLASSPATH="${MEDREC_WEBLOGIC_CLASSPATH}"
fi
fi
echo "."
echo "."
echo "JAVA Memory arguments: ${MEM_ARGS}"
echo "."
echo "WLS Start Mode=${WLS_DISPLAY_MODE}"
echo "."
echo "CLASSPATH=${CLASSPATH}"
echo "."
echo "PATH=${PATH}"
echo "."
echo "***************************************************"
echo "* To start WebLogic Server, use a username and *"
echo "* password assigned to an admin-level user. For *"
echo "* server administration, use the WebLogic Server *"
echo "* console at http://hostname:port/console *"
echo "***************************************************"
# CLASS CACHING
if [ "${CLASS_CACHE}" = "true" ] ; then
classCaching
fi
# START WEBLOGIC
echo "starting weblogic with Java version:"
${JAVA_HOME}/bin/java ${JAVA_VM} -version
if [ "${WLS_REDIRECT_LOG}" = "" ] ; then
echo "Starting WLS with line:"
echo "${JAVA_HOME}/bin/java ${JAVA_VM} ${MEM_ARGS} -Dweblogic.Name=${SERVER_NAME} -Djava.security.policy=${WL_HOME}/server/lib/weblogic.policy ${JAVA_OPTIONS} ${PROXY_SETTINGS} ${SERVER_CLASS}"
${JAVA_HOME}/bin/java ${JAVA_VM} ${MEM_ARGS} -Dweblogic.Name=${SERVER_NAME} -Djava.security.policy=${WL_HOME}/server/lib/weblogic.policy ${JAVA_OPTIONS} ${PROXY_SETTINGS} ${SERVER_CLASS}
else
echo "Redirecting output from WLS window to ${WLS_REDIRECT_LOG}"
${JAVA_HOME}/bin/java ${JAVA_VM} ${MEM_ARGS} -Dweblogic.Name=${SERVER_NAME} -Djava.security.policy=${WL_HOME}/server/lib/weblogic.policy ${JAVA_OPTIONS} ${PROXY_SETTINGS} ${SERVER_CLASS} >"${WLS_REDIRECT_LOG}" 2>&1
fi
stopAll
popd
# Exit this script only if we have been told to exit.
if [ "${doExitFlag}" = "true" ] ; then
exit
fi