Configuring rsync for Deployment Synchronization

Deployment synchronization can be done using rsync, which is a file copying tool. These changes must be done in the manager node and in the same directory.

Create a file named workers-list.txt, somewhere in your machine, that lists all the worker nodes in the deployment. The following is a sample of the file where there are two worker nodes.

Different nodes are separated by new lines.
workers-list.txt
```
ubuntu@192.168.1.1:~/setup/192.168.1.1/as/as_worker/repository/deployment/server
ubuntu@192.168.1.2:~/setup/192.168.1.2/as/as_worker/repository/deployment/server
```
If you have configured tenants in worker nodes, you need to add the repository/tenants directory of the worker node to the list to synchronize tenant space. For example, if the node ubuntu@192.168.1.1 needs to be synced with both the super tenant and the tenant space, the following two entries should be added to the workers-list.txt file.
workers-list.txt
ubuntu@192.168.1.1:~/setup/192.168.1.1/apim/apim_worker/repository/deployment/server ubuntu@192.168.1.1:~/setup/192.168.1.1/apim/apim_worker/repository/tenants

Create a file to synchronize the <API-M_HOME>/repository/deployment/server folders between the manager and all worker nodes.

You must create your own SSH key and define it as the pem_file. Alternatively, you can use an existing SSH key. For information on generating and using the SSH Keys, go to the SSH documentation. Specify the manager_server_dir depending on the location in your local machine. Change the logs.txt file path and the lock location based on where they are located in your machine.

rsync-for-carbon-depsync.sh

#!/bin/sh

manager_server_dir=~/wso2as-5.2.1/repository/deployment/server/
pem_file=~/.ssh/carbon-440-test.pem


#delete the lock on exit
trap 'rm -rf /var/lock/depsync-lock' EXIT 

mkdir /tmp/carbon-rsync-logs/


#keep a lock to stop parallel runs
if mkdir /var/lock/depsync-lock; then
  echo "Locking succeeded" >&2
else
  echo "Lock failed - exit" >&2
  exit 1
fi


#get the workers-list.txt
pushd `dirname $0` > /dev/null
SCRIPTPATH=`pwd`
popd > /dev/null
echo $SCRIPTPATH


for x in `cat ${SCRIPTPATH}/workers-list.txt`
do
echo ================================================== >> /tmp/carbon-rsync-logs/logs.txt;
echo Syncing $x;
rsync --delete -arve "ssh -i  $pem_file -o StrictHostKeyChecking=no" $manager_server_dir $x >> /tmp/carbon-rsync-logs/logs.txt
echo ================================================== >> /tmp/carbon-rsync-logs/logs.txt;
done

Create a Cron job that executes the above file every minute for deployment synchronization. Do this by running the following command in your command line.

You can only run the Cron job on one given node (master) at a given time. If you switch the Cron job to another node, you must stop the Cron job on the existing node and start a new Cron job on the new node after updating it with the latest files.
```
*   *  *   *   *     /home/ubuntu/setup/rsync-for-depsync/rsync-for-depsync.sh
```