188 lines
4.4 KiB
ReStructuredText
188 lines
4.4 KiB
ReStructuredText
Backup that Database!
|
|
=====================
|
|
|
|
**Junior**
|
|
|
|
A Backup? Don't you have this kind of things already automated?
|
|
|
|
**Senior**
|
|
|
|
Well, is not that simple. We of course have periodic backups. But, our
|
|
project team ask us for a backup every time a project is finished.
|
|
|
|
I've already prepared a script to do the task. Before executing it in
|
|
production download it and test it in your own machine.
|
|
|
|
.. code-block:: console
|
|
|
|
$ curl --output backup_db.sh 'https://raw.githubusercontent.com/BBVA/kapow/master/docs/source/tutorial/materials/backup_db.sh'
|
|
$ chmod u+x backup_db.sh
|
|
|
|
**Junior**
|
|
|
|
Ok, done! When I executed it the output says:
|
|
|
|
.. code-block:: console
|
|
|
|
$ ./backup_db.sh
|
|
Backup done!
|
|
Your log file is at /tmp/backup_db.log
|
|
|
|
**Senior**
|
|
|
|
That's right. That script performed the backup and stored it into the
|
|
**Backup Server** and appended some information into the backup log
|
|
file at ``/tmp/backup_db.log``.
|
|
|
|
Now you can SSH into the **Corporate Server** and make the real
|
|
backup.
|
|
|
|
|
|
**Junior**
|
|
|
|
Wait, wait... how long have you been doing this?
|
|
|
|
|
|
**Senior**
|
|
|
|
This procedure was already here when I arrived.
|
|
|
|
**Junior**
|
|
|
|
And why don't they do it themselves? I mean, what do you contribute
|
|
to the process?
|
|
|
|
**Senior**
|
|
|
|
I am the only allowed to SSH into the **Corporate Server** for obvious
|
|
reasons.
|
|
|
|
**Junior**
|
|
|
|
Why do you need to SSH in the first place? Couldn't it be done
|
|
without SSH?
|
|
|
|
**Senior**
|
|
|
|
Actually it could be done with a promising new tool I've just found...
|
|
Kapow!
|
|
|
|
Is a tool that allows you to publish scripts as HTTP services. If we
|
|
use it here we can give them the ability to do the backup whenever
|
|
they want.
|
|
|
|
**Junior**
|
|
|
|
Sounds like less work for me. I like it.
|
|
|
|
**Senior**
|
|
|
|
Ok then, let's try on your laptop first.
|
|
|
|
First of all you have to follow the `installation instructions </the_project/install_and_configure>`_.
|
|
|
|
**Junior**
|
|
|
|
I've just installed it in my laptop, but I don't understand how all of
|
|
this is going to work.
|
|
|
|
**Senior**
|
|
|
|
Don't worry it is pretty easy. Basically we will provide an HTTP
|
|
endpoint managed by *Kapow!* at the **Corporate Server**; when the
|
|
project team wants to perform a backup they only need to call the
|
|
endpoint and *Kapow!* will call the backup script.
|
|
|
|
**Junior**
|
|
|
|
It seems pretty easy. How can I create the endpoint?
|
|
|
|
**Senior**
|
|
|
|
First you have to start a fresh server. Please run this in your laptop:
|
|
|
|
.. code-block:: console
|
|
|
|
$ kapow server
|
|
|
|
.. warning::
|
|
|
|
It is important that you run this command in the same directory
|
|
in which you downloaded ``backup_db.sh``.
|
|
|
|
**Junior**
|
|
|
|
Done! But it doesn't do anything.
|
|
|
|
**Senior**
|
|
|
|
Now you have the port 8080 open but don't have any endpoints defined.
|
|
To define our endpoint you have to run this in another terminal:
|
|
|
|
.. code-block:: console
|
|
|
|
$ kapow route add -X PUT /db/backup -e ./backup_db.sh
|
|
|
|
This will create an endpoint accessible via
|
|
``http://localhost:8080/db/backup``. This endpoint have to be invoked
|
|
with the ``PUT`` method to prevent accidental calls.
|
|
|
|
**Junior**
|
|
|
|
Cool! Do we need to do all this stuff every time we start the
|
|
**Corporate Server**?
|
|
|
|
**Senior**
|
|
|
|
Not at all. The have thought of everything. You can put all your route
|
|
definitions in a special script file and pass it to the server on
|
|
startup. They call those files `POW` files and have ``.pow``
|
|
extension.
|
|
|
|
It should look something like:
|
|
|
|
.. code-block:: console
|
|
|
|
$ cat backup.pow
|
|
kapow route add -X PUT /db/backup -e ./backup_db.sh
|
|
|
|
And then you can start *Kapow!* with it:
|
|
|
|
.. code-block:: console
|
|
|
|
$ kapow server backup.pow
|
|
|
|
**Junior**
|
|
|
|
Great! Now it says:
|
|
|
|
.. code-block:: console
|
|
|
|
$ kapow server backup.pow
|
|
2019/11/26 11:40:01 Running powfile: "backup.pow"
|
|
{"id":"19bb4ac7-1039-11ea-aa00-106530610c4d","method":"PUT","url_pattern":"/db/backup","entrypoint":"./backup_db.sh","command":"","index":0}
|
|
2019/11/26 11:40:01 Done running powfile: "backup.pow"
|
|
|
|
I understand that this is proof that we have the endpoint available.
|
|
|
|
**Senior**
|
|
|
|
That appears to be the case, but better we check it.
|
|
|
|
Call it with ``curl``:
|
|
|
|
.. code-block:: console
|
|
|
|
$ curl -X PUT http://localhost:8080/db/backup
|
|
|
|
**Junior**
|
|
|
|
Yay! I can see the log file at ``/tmp/backup_db.log``
|
|
|
|
**Senior**
|
|
|
|
That's great. I am going to install all this in the *Corporate Server*
|
|
and forget about the old procedure.
|
|
|
|
That enough for your first day! You can go home.
|