Pratique du Shadowing: Provision LEMP with Ansible on a Raspberry Pi Cluster (Pi Dramble #4) - Apprendre l'anglais à l'oral avec la vidéo
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Welcome to the Raspberry Pi Dramble cluster video series.
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In this video, I'm going to show you how you can use Ansible to install all the software
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that you need onto this Raspberry Pi cluster so that you can run a Drupal 8 website on it.
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The first step after setting up all the networking is to make sure
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that your computer and Ansible can communicate with all the Raspberry Pis using the IP addresses that we had set up.
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So the first thing that I'm going to do is I'm going to make sure
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that I can ping all the servers from Ansible.
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And what this command is doing is saying look at all the servers in the inventory file
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that I specified and run the ping module which basically pings the server and checks and makes sure it can connect.
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And in this case it's saying that it can connect to all of them so that's good.
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I'll show you the inventory file really quick.
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Note that this one's a little more complicated than the one that I showed you in the networking video.
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This one shows you that I've split up the the different servers by the balancer, which is this one on the top, and then the web servers,
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which is these two, the second and third Raspberry Pis, and then the database servers, which is the last two, the master and then the slave or the replica.
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So once I've set up that inventory file and made sure that I can communicate with the servers,
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I'm ready to run the Ansible playbook that'll deploy all the software that's needed.
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So I'm going to go to the Provision the Raspberry Pi page here
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and it gives me two commands I need to run.
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First I need to make sure that I install all the Ansible Galaxy requirements.
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So I run this command, I already did that, and I also need to make sure
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that I have a config.yaml file which has all the specific settings for my cluster.
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So I've already copied this example.config.yaml file over to config.yaml, and I've tweaked a few settings to my likings.
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Once that's done, I can run this ansible playbook command, which is going to run a bunch of different task lists
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that will install all the software that you need on all the Raspberry Pis.
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One of the cool things about using ansible is, since I've already told it about all the servers that I have, I can run commands like this,
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which will check how much RAM is free on each of the Raspberry Pis using the free command.
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Once I've described everything to Ansible, then Ansible can do everything for me instead of me having to log in to each of the servers.
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If you want to find out more about how to use Ansible this way, and why you'd want to use Ansible,
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I have another video that I'll link called Ansible one-on-one on a cluster of Raspberry Pis.
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I also wrote a book on it, Ansible for DevOps, if you're interested in diving deeper.
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But for now I'm going to take this command and let it run.
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While it's running I'll kind of briefly explain what it's doing
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and then I'll let it run while the video is sped up since it takes a while to run.
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So first of all it's calling this main.yaml file.
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This file includes three different files, one file that runs on the balancer, one file that runs on the database servers, and one file that runs on the web servers.
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So let's take a quick look at the database playbook.
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If I look here, it loads some variables from these different files.
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It makes sure that there's a certain piece of software installed on the Raspberry Pi, the sudo package.
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Then it will set up a firewall, it sets up some security settings, it installs and configures MySQL for the database server,
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and it also installs Munin node which is software used to monitor the server.
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And then there's also some scripts in a custom role I have
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that installs a few scripts to control the LEDs on the front.
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notice that the LEDs right now are all turned off, but through the course of this playbook, LEDs will start turning on,
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like this one just turned on as the configuration for the balancer just finished.
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So I have some scripts that will control the LEDs from software
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and I'll show you how those are used at the end of the playbook run.
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Now that everything's finished, you'll notice that the LEDs in all the Pies, except for the two web servers at this point, are turned on and green.
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That means that they're ready to go and that I could install Drupal on them next.
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Before I get to that though,
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I'll show you how the balancer is actually balancing the request to these other two servers by loading the site www.pydramble.com,
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which is what I've configured in my config.yaml file.
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If I go here, it's actually going to send a request to this first server, and the first server is going to balance that request to one of the other two servers.
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So if I hit enter, you'll see that there is a red and a red on this one, and if I refresh the page, it's actually going to send the request to this server.
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And you'll see that every time I send a request, it always goes to the load balancer,
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and then the balancer sends the requests alternately to one of these two servers.
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So at this point it's saying file not found
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which basically means I don't have Drupal installed on the Pi Dramble cluster yet.
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Thank you.
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Vocabulaire et conseils d’expression pour cette leçon
Cette leçon d’expression orale de niveau C1 s’appuie sur la vidéo « Provision LEMP with Ansible on a Raspberry Pi Cluster ». Les mots qui reviennent le plus souvent : server, file, ansible, Raspberry, install. Cette vidéo contient 58 phrases et 974 mots à répéter en shadowing. La partie parlée dure 5:41. Le locuteur parle à un rythme naturel d’environ 172 mots par minute, proche d’une conversation courante. Seuls 76 % des mots font partie des 3 000 mots les plus courants en anglais, le vocabulaire est donc exigeant.
Vocabulaire clé de cette vidéo
Les 11 mots les plus avancés de la vidéo, avec leur prononciation et leur sens :
| Mot | Prononciation | Sens |
|---|---|---|
| ansible nom | /ˈæn.sɪ.bəl/ | ansible |
| cluster nom | /ˈklʌstɚ/ | groupe |
| configure verbe | /kənˈfɪɡə(ɹ)/ | configurer |
| alternately adverbe | /ˈɔl.tɚ.nət.li/ | alternativement |
| firewall nom | /ˈfaɪ(ə)ɹˌwɔl/ | mur coupe-feu |
| refresh verbe | /ɹɪˈfɹɛʃ/ | revigorer, rafraîchir |
| replica nom | /ˈɹɛplɪkə/ | réplique, copie exacte |
| specify verbe | /ˈspɛs.əˌfaɪ/ | spécifier |
| module nom | /ˈmɑd͡ʒul/ | module |
| configuration nom | /kənˌfɪɡ.əˈɹeɪ̯.ʃən/ | configuration |
| liking nom | /ˈlaɪkɪŋ/ | goût, sympathie |
Les verbes à particule que vous entendrez
| Mot | Prononciation | Sens |
|---|---|---|
| set up verbe | /ˌsɛt ˈʌp/ | mettre en place, installer |
| find out verbe | découvrir, savoir | |
| turn off verbe | éteindre |
La grammaire de cette vidéo
Les structures que le locuteur utilise le plus, avec les mots exacts de la vidéo :
| Structure | Dans la vidéo |
|---|---|
| Present perfect have/has + participe passé — une action passée qui compte encore maintenant | I've split · I've set · I've already copied |
| Propositions relatives who / which + proposition — une précision sur une personne ou une chose | balancer, which is · servers, which is · file which has |
| Voix passive be + participe passé — l’accent est mis sur ce qui arrive, pas sur qui le fait | is sped · are turned |
Prononciation à surveiller
Le locuteur utilise 27 contractions et formes réduites, comme I've, I'll, I'm. Prononcez-les sous leur forme courte, telles que vous les entendez.
- Les sons « sh » et « zh »: refresh /ɹɪˈfɹɛʃ/, configuration /kənˌfɪɡ.əˈɹeɪ̯.ʃən/
- Mots longs — placez bien l’accent: alternately /ˈɔl.tɚ.nət.li/, configuration /kənˌfɪɡ.əˈɹeɪ̯.ʃən/
Les sons difficiles pour les francophones :
- /r/ anglais — langue recourbée, sans frotter la gorge: configure /kənˈfɪɡə(ɹ)/, firewall /ˈfaɪ(ə)ɹˌwɔl/, refresh /ɹɪˈfɹɛʃ/, replica /ˈɹɛplɪkə/, configuration /kənˌfɪɡ.əˈɹeɪ̯.ʃən/
- /ŋ/ final — sans prononcer de /g/ après: ping /pɪŋ/, liking /ˈlaɪkɪŋ/
Comment s’entraîner avec cette vidéo
- Écoutez la vidéo en entier une fois sans parler et notez les mots que vous ne connaissez pas.
- Commencez à la vitesse 0,75×, répétez phrase par phrase, puis revenez à la vitesse normale quand cela devient facile.
- Enregistrez-vous et comparez avec l’original, en faisant attention à des mots comme ansible, cluster, configure.
Qu'est-ce que la technique du Shadowing ?
Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.