Friday, 9 December 2016

Migrating to a new server

Sometimes you need to move your sFlowTrend installation to a new server. This is quite easy to do without losing any data, but you have to be careful to make sure it goes smoothly. All of the data is in the sFlowTrend home directory. For free sFlowTrend, this contains the configuration and user preferences (when using the web client). For sFlowTrend-Pro, it also includes all of your traffic data contained in the database.

First, find the location of the home directory on the old system. If you installed sFlowTrend using an interactive installer, then you would have selected the directory during installation. If you used a package installer on Linux, then you can't change the location. In any case, you can find the name of the directory using Configuration>System Configuration in the web client:

Next, stop the sFlowTrend service on the old system. It is essential that you do this step, otherwise data is likely to be corrupted.

On Windows, use Windows Administrative Tools>Services, find sFlowTrend-Pro server, and stop it.
On Linux, depending on which distribution you are using, one of the following commands will work:
# systemctl stop sflowtrend-server
# service sflowtrend-server stop
# /etc/init.d/sflowtrend-server stop

Once you have stopped the service on the old system, move to the new one. Go ahead and install sFlowTrend on this system, again taking note of the home directory. Then, stop the sFlowTrend service on the new system - again, it is critical that you do this step. After this, copy the entire home directory from the old system to the new system, ensuring that the ownership and file permissions stay the same. Start the service on the new system.

At this stage, sFlowTrend should be running on the new system. There may be a couple of other tasks that need to be done. First, if you are using sFlowTrend-Pro and the new system has a different hostname from the old, then you will need to update the license to have the new hostname. To do this, go to, log in, and click the Request New Key link to the license. The license will be updated shortly. Next, if the IP address of the new system is different, then you will need to update the sFlow configuration on your infrastructure to forward sFlow data to the new system, rather than the old. There's more information on configuring sFlow in this blog post, and in the on-line help.

Now you have sFlowTrend running on the new system, you can uninstall it on the old. To recover some space, you can also delete the home directory on the old system, as this isn't automatically deleted when uninstalling.

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