schnatterer/tomcat-reloading-connector-example

By schnatterer

•Updated over 5 years ago

Tomcat connector that automatically reloads SSLConfig

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schnatterer/tomcat-reloading-connector-example repository overview

⁠tomcat-reloading-connector

Tomcat connector that automatically reloads SSLConfig.

⁠How to use?

Right now, tomcat-reloading-connector offers a specialized org.apache.coyote.http11.Http11AprProtocol that watches the folder that contains the first configured certificate for changes and reloads SSLConfig on change.

Http11AprProtocol means this will only work with Apache Portable Runtime (APR) based Native library for Tomcat⁠.

⁠Dependency

<dependency>
  <groupId>info.schnatterer.tomcat-reloading-connector</groupId>
  <artifactId>tomcat-reloading-connector</artifactId>
  <version>0.1.0</version>
</dependency>

If you need the jar you could also download it manually, from here:

https://repo1.maven.org/maven2/info/schnatterer/tomcat-reloading-connector/reloading-connector/0.1.0/reloading-connector-0.1.0.jar

You can also get snapshot versions from our snapshot repository⁠ (for the most recent commit). To do so, add the following repo to your pom.xml or settings.xml:

<repository>
    <id>snapshots-repo</id>
    <url>https://oss.sonatype.org/content/repositories/snapshots</url>
    <releases><enabled>false</enabled></releases>
    <snapshots><enabled>true</enabled></snapshots>
</repository>

⁠Use with Tomcat

Drop the reloading-connector.jar into your tomcat's library folder.
Configure the ReloadingHttp11AprProtocol in your server.xml.
Example:

<Connector port="8443" protocol= "info.schnatterer.tomcat.ReloadingHttp11AprProtocol" SSLEnabled="true" >
    <UpgradeProtocol className="org.apache.coyote.http2.Http2Protocol" />
    <SSLHostConfig>
        <Certificate certificateKeyFile="path/privkey.pem"
         certificateFile="path/cert.pem"
         certificateChainFile="path/fullchain.pem"
         type="RSA" />
    </SSLHostConfig>
</Connector>

See also example⁠.

Note that the certificates are not reloaded instantly but there is a short delay (default: 3s) to make sure all files related to the certificated (cert, key, chain) have been written and no inconsistent state is loaded by tomcat.
If you need to customize this, you can set the delay in milliseconds via the environment variable TOMCAT_DELAY_RELOAD_CERTIFICATES_MILLIS.
For example for letsencrypt the time between the creation of CSR and full chain usually is between 10-20s.

⁠Usage with Spring Boot

Add the dependency to your embedded tomcat project.
Create a Connector with the ReloadingHttp11AprProtocol and configure it.
See example⁠.

⁠Usage with Embedded Tomcat

Add the dependency to your embedded tomcat project.
Create a Connector with the ReloadingHttp11AprProtocol and configure it.
See example⁠.

⁠Try it

⁠Docker

CONTAINER=$(docker run --rm -p8443:8443 -d schnatterer/tomcat-reloading-connector-example)
sleep 2

# View web app
curl -k https://localhost:8443
# View cert
echo | openssl s_client -showcerts -servername localhost -connect localhost:8443 2>/dev/null | openssl x509 -inform pem -noout -text | grep -A2 Validity

# Reload certs
docker exec ${CONTAINER} /createCerts.sh
# View new cert
sleep 5
echo | openssl s_client -showcerts -servername localhost -connect localhost:8443 2>/dev/null | openssl x509 -inform pem -noout -text | grep -A2 Validity
docker stop ${CONTAINER}

If you want to build the image yourself:
(note that they are included into one Dockerfile to keep them DRY)

docker build . builds the spring-boot image
docker build --build-arg=FLAVOR=embedded-tomcat . builds the embedded tomcat image
docker build --build-arg=FLAVOR=standalone-tomcat . builds the standalone tomcat image

⁠Locally

mvn package

# Copy lib binaries from bitnami image
# Or compile yourself
# https://tomcat.apache.org/tomcat-9.0-doc/apr.html
# Download: https://tomcat.apache.org/download-native.cgi
# Deps: sudo apt-get install libapr1 libapr1-dev 
CONTAINER=$(docker create bitnami/tomcat:9.0.31-debian-10-r25 )
docker cp ${CONTAINER}:/opt/bitnami/tomcat/lib /tmp
docker rm ${CONTAINER}
mkdir lib
mv /tmp/lib/libapr* /tmp/lib/libtcnative* lib

./createCerts.sh

# Start embedded tomcat
LD_LIBRARY_PATH="$(pwd)/lib:${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}" java -jar examples/embedded-tomcat/target/tomcat-jar-with-dependencies.jar
# or spring boot
LD_LIBRARY_PATH="$(pwd)/lib:${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}" java -jar examples/spring-boot/target/spring-boot-*.jar
# Standalone example is docker only

⁠Releasing

./mvnw release:prepare -DreleaseVersion=0.3.0 -DdevelopmentVersion=0.3.1-SNAPSHOT

Sets versions in pom.xml, commits, tags and pushes to SCM. Travis builds tag and pushes to Maven Central.

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Last updated

over 5 years ago

docker pull schnatterer/tomcat-reloading-connector-example