Prática de Shadowing: Provision LEMP with Ansible on a Raspberry Pi Cluster (Pi Dramble #4) - Aprenda a falar inglês com vídeo
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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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Vocabulário e dicas de fala para esta lição
Esta aula de conversação de nível C1 usa o vídeo “Provision LEMP with Ansible on a Raspberry Pi Cluster”. As palavras que mais se repetem: server, file, ansible, Raspberry, install. Este vídeo tem 58 frases e 974 palavras para praticar shadowing. A fala dura 5:41. O falante fala em ritmo natural, cerca de 172 palavras por minuto, próximo de uma conversa do dia a dia. Apenas 76% das palavras estão entre as 3.000 mais comuns do inglês, por isso o vocabulário é exigente.
Vocabulário principal deste vídeo
As 12 palavras mais avançadas do vídeo, com pronúncia e significado:
| Palavra | Pronúncia | Significado |
|---|---|---|
| ansible substantivo | /ˈæn.sɪ.bəl/ | ansível |
| cluster substantivo | /ˈklʌstɚ/ | aglomeração, aglomerado |
| configure verbo | /kənˈfɪɡə(ɹ)/ | configurar |
| alternately advérbio | /ˈɔl.tɚ.nət.li/ | alternadamente |
| firewall substantivo | /ˈfaɪ(ə)ɹˌwɔl/ | parede corta-fogo |
| refresh verbo | /ɹɪˈfɹɛʃ/ | refrescar |
| replica substantivo | /ˈɹɛplɪkə/ | réplica, cópia exata |
| deploy verbo | /dɪˈplɔɪ/ | posicionar |
| specify verbo | /ˈspɛs.əˌfaɪ/ | especificar |
| module substantivo | /ˈmɑd͡ʒul/ | módulo |
| configuration substantivo | /kənˌfɪɡ.əˈɹeɪ̯.ʃən/ | configuração |
| liking substantivo | /ˈlaɪkɪŋ/ | gosto |
Phrasal verbs que você vai ouvir
| Palavra | Pronúncia | Significado |
|---|---|---|
| set up verbo | /ˌsɛt ˈʌp/ | preparar |
| find out verbo | descobrir | |
| turn off verbo | desligar, apagar |
Gramática neste vídeo
As estruturas que o falante mais usa, com as palavras exatas do vídeo:
| Estrutura | No vídeo |
|---|---|
| Present perfect have/has + particípio passado — uma ação passada que ainda importa agora | I've split · I've set · I've already copied |
| Orações relativas who / which + oração — informação extra sobre uma pessoa ou coisa | balancer, which is · servers, which is · file which has |
| Voz passiva be + particípio passado — o foco está no que acontece, não em quem faz | is sped · are turned |
Pronúncia para ficar de olho
O falante usa 27 contrações e formas reduzidas, como I've, I'll, I'm. Diga-as na forma curta, do jeito que você ouve.
- Os sons de “sh” e “zh”: refresh /ɹɪˈfɹɛʃ/, configuration /kənˌfɪɡ.əˈɹeɪ̯.ʃən/
- Palavras longas — acerte a sílaba tônica: alternately /ˈɔl.tɚ.nət.li/, configuration /kənˌfɪɡ.əˈɹeɪ̯.ʃən/
Sons difíceis para falantes de português:
- Consoante final — sem acrescentar um “i” depois: playbook /ˈpleɪ.bʊk/, config /ˌkənˈfɪɡ/, node /noʊd/
- /l/ final — a língua toca o céu da boca, não vira “u”: ansible /ˈæn.sɪ.bəl/, firewall /ˈfaɪ(ə)ɹˌwɔl/, module /ˈmɑd͡ʒul/
Como praticar com este vídeo
- Ouça o vídeo inteiro uma vez sem falar e anote as palavras que você não conhece.
- Comece na velocidade 0,75×, faça shadowing frase por frase e volte à velocidade normal quando ficar fácil.
- Grave a sua voz e compare com o original, prestando atenção a palavras como ansible, cluster, configure.
O que é a Técnica de Shadowing?
Shadowing é uma técnica de aprendizado de idiomas com base científica, originalmente desenvolvida para o treinamento de intérpretes profissionais. O método é simples, mas poderoso: você ouve áudio em inglês nativo e repete imediatamente em voz alta — como uma sombra seguindo o falante com 1-2 segundos de atraso. Pesquisas mostram melhora significativa na precisão da pronúncia, entonação, ritmo, sons conectados, compreensão auditiva e fluência na fala.