CentOS		Debian

perfSONAR Lookup Service Registration Daemon

The Lookup Service (LS) Registration daemon registers and maintains records with the lookup service. It includes features such as autodetecting hardware details of the host on which it is running and registering these as host and interface records in the Lookup Seervice. It also registers service records of the various perfSONAR components, in many cases detecting whether the service is up prior to registering and autodetcting service specific features where applicable. It opaquely handles most record management tasks, such as refreshing a record and avoiding duplicate registrations. It is designed to be extensible so that new registration types may be added with minimal effort.

Getting the Code

You may checkout the code with the following command:

git clone --recursive https://github.com/perfsonar/ls-registration-daemon.git

Note the use of the --recursive option to ensure any submodule trees are included in the clone.

Building and Installing

To install the code on your system run:

make install

Packaging

You may create a source tarball of this code with the following:

make dist

Running

To start the service run:

/etc/init.d/perfsonar-lsregistrationdaemon start

To stop the service run:

/etc/init.d/perfsonar-lsregistrationdaemon stop

To restart the service run:

/etc/init.d/perfsonar-lsregistrationdaemon restart

Using the shared Submodule

This repository contains a git submodule to the perfSONAR shared repository. This submodule is used to access common perfSONAR libraries. You will find a number of symbolic links to these modules under lib. The use of a submodule has a few implications when working with the code in this repository:

As previously noted, when you clone the repository for the first time, you will want to use the --recursive option to make sure the submodule tree is included. If you do not, any symbolic links under lib will be broken in your local copy. If you forget the --recursive option, you can pull the submodule tree with the following commands:
```
git submodule init
git submodule update
```
When you are editing files under lib be sure to check if you are working on an actual file or whether it's a link to something under shared. In general it is better to make changes to the shared submodule by editing the shared repository directly. If however you do make changes while working in this repository, see the git submodule page for more details on pushing those changes to the server.
Keep in mind that a submodule points at a specific revision of the repository it is referencing. As such if a new commit is made to the shared submodule's repository, this project will not get the change automatically. Instead it will still point at the old revision. To update to the latest revision of the shared submodule repository run the following commands:
```
git submodule foreach git pull origin master
git commit -a -m "Updating to latest shared"
git push
```
If you want to include a new file from the shared submodule, create a symbolic link under lib. For example, if you were to add a reference to the perfSONAR_PS::Utils::DNS module you would run the following:
```
mkdir -p lib/perfSONAR_PS/Utils/
cd lib/perfSONAR_PS/Utils/
ln -s ../../../shared/lib/perfSONAR_PS/Utils/DNS.pm DNS.pm
```

For more information on using the submodule, see the shared/README.md file or access it here

Running in Vagrant

This repository allows you to use Vagrant to create a VM on VirtualBox with the necessary components installed. The default VM is based on CentOS 7 and creates a shared folder in the VM that points at the top-level of your checked-out copy. This allows you to edit files on your base system and have the changes automatically appear in the VM.

Installation

Install VirtualBox according the the instructions on their site for your system.
Install Vagrant according the the instructions on their site for your system.
Install the vagrant-vbguest and vagrant-reload plugins with the following commands:
```
vagrant plugin install vagrant-vbguest
vagrant plugin install vagrant-reload
```

Starting the VM

Clone this github repo
Start the VM with vagrant up. The first time you do this it will take awhile to create the initial VM.

Using the VM

The VM sets-up a lookup service wuth port forwarding by default so you can access a test lookup service from the host system. By default, your ls-registration-daemon will register to this local lookup-service. You can access the lookup service by visiting http://127.0.0.1:8090/lookup/records on the host system.
Any changes you make to the checked-out code on your host system get reflected in the host VM under the /vagrant directory
The following symlinks are setup to files in the git copy of the code:
- /etc/perfsonar -> /vagrant/vagrant-data/pslsreg-el7/etc/perfsonar
You can clear out the contents of the lookup service by running the mongo lookup followed by db.services.remove({})
Run vagrant reload to restart the VM
Run vagrant suspend to freeze the VM. Running vagrant up again will restore the state it was in when you suspended it.
Run vagrant halt to shutdown the VM. Running vagrant up again will run through the normal boot process.
Run vagrant destory to completely delete the VM. Running again vagrant up will build a brand new VM.