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Distributed ANT Extention

This extention to Apache Ant allows really simple remote execution using SSH infrastructure.

Supported tasks

<cluster> task

Maps logical node IDs to real host details.

<cluster>
    <basepath>/apps/myapp</basepath>
    <server id="server1" host="cbox1.acme.com"/>
    <server id="server2" host="cbox2.acme.com"/>
</cluster>

For authentication configuration see Nanocloud SSH configuration details.

<remotely> task

Executes nested tasks on remote node (or nodes) defined by <cluster> task. Wild cards could be used to execute task in parallel accross servers.

<remotely servers="server*">
    <echo>This is slave ${slave.id}</echo>
</remotely>

<syncdown> task

Synchronize file systems from master to slave process. This task can only be executed inside of <remotely> task.

<remotely servers="server*">
    <echo>This is slave ${slave.id}</echo>
    <syncdown sourceBase="target/resources">
        <retain>logs/**</retain> <!-- do not remove content of "logs" directory at destination -->
        <exclude>**/.mkdir</exclude> <!-- do not copy these files -->
        <exclude>**/b.txt</exclude> <!-- do not copy these files -->
        <copy rename="b.txt">**/b.txt.v2</copy> <!-- rename file b.txt.v2 into b.txt while copying -->
        <copy/> <!-- copy rest of context as is -->
    </syncdown>
</remotely>
  • rsync like delta compression protocol is used to reduce data transfer.
  • destination derectory is clean (equivalent to removing and creating fresh copy).
  • optionally certain files could be retained at destination

<urlget>

Similar fetches resource by URL. May use master process as proxy (usefully if slave is in restricted network).