Tomcat

The official Tomcat Docker image returns a 404 by default — no webapps are loaded. Two approaches to fix this:

Manual Setup

N/ABASH

docker run -d -p 8888:8080 --name tomcat1101 --hostname tomcat1101 tomcat:11.0.1
docker exec -it tomcat1101 bash
 
# Copy landing page and manager app
cp -r /usr/local/tomcat/webapps.dist/ROOT/ /usr/local/tomcat/webapps/ROOT
cp -r /usr/local/tomcat/webapps.dist/manager /usr/local/tomcat/webapps/manager
 
# Allow manager access from all IPs
sed -i 's/allow="[^"]*"/allow=".*"/' /usr/local/tomcat/webapps/manager/META-INF/context.xml
 
# Add admin user
sed -i '/<\/tomcat-users>/d' /usr/local/tomcat/conf/tomcat-users.xml
echo '  <role rolename="manager-gui"/>' >> /usr/local/tomcat/conf/tomcat-users.xml
echo '  <role rolename="admin-gui"/>' >> /usr/local/tomcat/conf/tomcat-users.xml
echo '  <user username="admin" password="admin" roles="manager-gui,admin-gui"/>' >> /usr/local/tomcat/conf/tomcat-users.xml
echo '</tomcat-users>' >> /usr/local/tomcat/conf/tomcat-users.xml

Dockerfile

DockerfileDOCKERFILE

FROM tomcat:11.0.1 as build
 
RUN mkdir -p /usr/local/tomcat/webapps/ROOT && \
    cp -r /usr/local/tomcat/webapps.dist/ROOT/* /usr/local/tomcat/webapps/ROOT && \
    cp -r /usr/local/tomcat/webapps.dist/manager /usr/local/tomcat/webapps/manager && \
    sed -i 's/allow="[^"]*"/allow=".*"/' /usr/local/tomcat/webapps/manager/META-INF/context.xml && \
    sed -i '/<\/tomcat-users>/d' /usr/local/tomcat/conf/tomcat-users.xml && \
    echo '  <role rolename="manager-gui"/>' >> /usr/local/tomcat/conf/tomcat-users.xml && \
    echo '  <role rolename="admin-gui"/>' >> /usr/local/tomcat/conf/tomcat-users.xml && \
    echo '  <user username="admin" password="admin" roles="manager-gui,admin-gui"/>' >> /usr/local/tomcat/conf/tomcat-users.xml && \
    echo '</tomcat-users>' >> /usr/local/tomcat/conf/tomcat-users.xml
 
FROM tomcat:11.0.1
 
COPY --from=build /usr/local/tomcat/webapps /usr/local/tomcat/webapps
COPY --from=build /usr/local/tomcat/conf /usr/local/tomcat/conf
 
EXPOSE 8080
 
CMD ["catalina.sh", "run"]

N/ABASH

docker build -t tomcat1101 .
docker run -d -p 8888:8080 --name tomcat1101 tomcat1101

Access at http://localhost:8888 — manager at /manager/html with admin:admin.