新手求助：从源码构建OpenDaylight Carbon版本步骤指导

Hey there! As someone who’s walked through building ODL Carbon multiple times, let’s fix this issue and get you up and running with a full step-by-step guide. The missing opendaylight/distribution/opendaylight/ directory usually comes from either cloning the wrong repo or skipping a critical build step—let’s cover everything from scratch.

Prerequisites First #

Carbon is picky about tool versions, so make sure you have these set up correctly:

• Java 8: Use OpenJDK 1.8.0_151+ or Oracle JDK 1.8.x (Java 9+ will break the build entirely)
• Apache Maven 3.3.9+: Older versions will cause dependency resolution failures
• Git: To pull the official Carbon source code

1. Configure Maven for ODL #

ODL relies on its own Maven repositories, so you need to update your Maven settings file (~/.m2/settings.xml). If the file doesn’t exist, create it in your home directory’s .m2 folder. Add this content inside the root <settings> tag:

<profiles>
  <profile>
    <id>odl</id>
    <activation>
      <activeByDefault>true</activeByDefault>
    </activation>
    <repositories>
      <repository>
        <id>opendaylight-snapshot</id>
        <url>https://nexus.opendaylight.org/content/repositories/opendaylight.snapshot/</url>
        <snapshots>
          <enabled>true</enabled>
        </snapshots>
        <releases>
          <enabled>false</enabled>
        </releases>
      </repository>
      <repository>
        <id>opendaylight-release</id>
        <url>https://nexus.opendaylight.org/content/repositories/opendaylight.release/</url>
        <snapshots>
          <enabled>false</enabled>
        </snapshots>
        <releases>
          <enabled>true</enabled>
        </releases>
      </repository>
    </repositories>
    <pluginRepositories>
      <pluginRepository>
        <id>opendaylight-snapshot</id>
        <url>https://nexus.opendaylight.org/content/repositories/opendaylight.snapshot/</url>
        <snapshots>
          <enabled>true</enabled>
        </snapshots>
        <releases>
          <enabled>false</enabled>
        </releases>
      </pluginRepository>
      <pluginRepository>
        <id>opendaylight-release</id>
        <url>https://nexus.opendaylight.org/content/repositories/opendaylight.release/</url>
        <snapshots>
          <enabled>false</enabled>
        </snapshots>
        <releases>
          <enabled>true</enabled>
        </releases>
      </pluginRepository>
    </pluginRepositories>
  </profile>
</profiles>

2. Clone the Correct Carbon Source Repository #

Open your terminal, create a dedicated working directory, and clone the distribution repo (this is where the build generates the runtime package you’re looking for):

mkdir odl-carbon-build && cd odl-carbon-build
git clone -b stable/carbon https://git.opendaylight.org/gerrit/p/distribution.git

3. Run the Maven Build #

Navigate into the cloned distribution directory and start the build. We skip tests to speed things up (you can remove -DskipTests if you want to run all validation tests, but it’ll add 1-2 hours to the process):

cd distribution
mvn clean install -DskipTests

This build can take 30-60 minutes depending on your internet speed (it downloads hundreds of dependencies). Wait until you see a clear BUILD SUCCESS message in the terminal.

4. Locate the Generated ODL Distribution #

Once the build finishes, the runtime package will be in this path:
distribution/opendaylight/target/

Inside that folder, you’ll find a zip file like opendaylight-0.6.4-Carbon.zip (the exact version number might vary slightly) and a corresponding tar.gz archive. Unzip this file to get your usable ODL instance:

unzip opendaylight-0.6.4-Carbon.zip
cd opendaylight-0.6.4-Carbon

5. Start OpenDaylight #

From the unzipped directory, launch the ODL Karaf container:

./bin/karaf

Wait 1-2 minutes for all core features to load, then you can access the web UI at http://localhost:8181/index.html (default credentials: admin/admin).

Troubleshooting Your Original Missing Directory Issue #

If you didn’t see the expected directory before, it’s almost certainly one of these two issues:

• You cloned the wrong repository (make sure it’s the distribution repo, not odlparent or another subproject)
• The build failed silently—check the Maven output for errors (common culprits: wrong Java version, outdated Maven, or network issues blocking dependency downloads)

内容的提问来源于stack exchange，提问作者sushmita das