Use a numeric USER instruction in Dockerfiles

Base/Dockerfile

@@ -41,11 +41,15 @@ RUN echo "${TZ}" > /etc/timezone \
   && dpkg-reconfigure --frontend noninteractive tzdata
 
 #========================================
-# Add normal user with passwordless sudo
+# Add normal user and group with passwordless sudo
 #========================================
-RUN useradd seluser \
-         --shell /bin/bash  \
+RUN groupadd seluser \
+         --gid 1201 \
+  && useradd seluser \
          --create-home \
+         --gid 1201 \
+         --shell /bin/bash \
+         --uid 1200 \
   && usermod -a -G sudo seluser \
   && echo 'ALL ALL = (ALL) NOPASSWD: ALL' >> /etc/sudoers \
   && echo 'seluser:secret' | chpasswd
@@ -75,7 +79,7 @@ RUN  mkdir -p /opt/selenium /var/run/supervisor /var/log/supervisor \
 #===================================================
 # Run the following commands as non-privileged user
 #===================================================
-USER seluser
+USER 1200:1201
 
 
 CMD ["/opt/bin/entry_point.sh"]

Hub/Dockerfile.txt

@@ -1,4 +1,4 @@
-USER seluser
+USER 1200
 
 #========================
 # Selenium Configuration

NodeBase/Dockerfile.txt

@@ -68,7 +68,7 @@ RUN apt-get -qqy update \
 # Run the following commands as non-privileged user
 #===================================================
 
-USER seluser
+USER 1200
 
 #==============================
 # Scripts to run Selenium Node and XVFB

NodeChrome/Dockerfile.txt

@@ -25,7 +25,7 @@ RUN wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key
 COPY wrap_chrome_binary /opt/bin/wrap_chrome_binary
 RUN /opt/bin/wrap_chrome_binary
 
-USER seluser
+USER 1200
 
 #============================================
 # Chrome webdriver

NodeDebug/Dockerfile.txt

@@ -17,7 +17,7 @@ RUN apt-get update -qqy \
     fluxbox \
   && rm -rf /var/lib/apt/lists/* /var/cache/apt/*
 
-USER seluser
+USER 1200
 
 #==============================
 # Generating the VNC password as seluser

NodeFirefox/Dockerfile.txt

@@ -30,7 +30,7 @@ RUN GK_VERSION=$(if [ ${GECKODRIVER_VERSION:-latest} = "latest" ]; then echo "0.
   && chmod 755 /opt/geckodriver-$GK_VERSION \
   && ln -fs /opt/geckodriver-$GK_VERSION /usr/bin/geckodriver
 
-USER seluser
+USER 1200
 
 COPY generate_config /opt/bin/generate_config
 

NodeOpera/Dockerfile.txt

@@ -32,7 +32,7 @@ RUN wget -q -O - https://deb.opera.com/archive.key | apt-key add - \
 COPY wrap_opera_binary /opt/bin/wrap_opera_binary
 RUN /opt/bin/wrap_opera_binary
 
-USER seluser
+USER 1200
 
 #=====================
 # Opera webdriver

Standalone/Dockerfile.txt

@@ -1,4 +1,4 @@
-USER seluser
+USER 1200
 
 #====================================
 # Scripts to run Selenium Standalone