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191 lines
10 KiB
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<rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:atom="http://www.w3.org/2005/Atom">
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<channel>
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<title>Sr Izan's Blog</title>
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<link>https://srizan.dev/blog</link>
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<description>My little donowall place on the net</description>
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<lastBuildDate>Thu, 23 Nov 2023 15:57:20 GMT</lastBuildDate>
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<language>en</language>
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<image>
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<title>Sr Izan's Blog</title>
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<url>https://srizan.dev/pfp.png</url>
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<link>https://srizan.dev/blog</link>
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<copyright>Copyleft 2023, Sr Izan</copyright>
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<atom:link href="https://srizan.dev/blog/rss.xml" rel="self" type="application/rss+xml"/>
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<item>
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<title><![CDATA[My tales of MongoDB migration]]></title>
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<link>https://srizan.dev/blog/2</link>
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<guid>https://srizan.dev/blog/2</guid>
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<pubDate>Sat, 11 Nov 2023 23:00:00 GMT</pubDate>
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<description><![CDATA[Here I ramble about the last service migration I did, MongoDB, and all the difficulties that came with it.]]></description>
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<content:encoded><![CDATA[<h2>Introduction</h2>
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<p>So, the last few months I've been migrating services from my good old Raspberry Pi into my new HP server and the last service I migrated was MongoDB.</p>
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<p>I've been using MongoDB for a while now and I've been using it for a few things, like my discord bots, <a href="https://github.com/SrIzan10/webhooks-ui">webhooks-ui</a> and probably other projects I don't remember right now.</p>
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<p>So, let's get started!</p>
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<h2>Testing the plan</h2>
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<p>My database instance is on Docker with a replica set of 1 node (itself) so <a href="https://www.prisma.io/">Prisma</a> works.</p>
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<p>My idea is to add the HP server as a secondary replica and then promote it to be the primary one, but I don't know if that will work, so we need to test some stuff.</p>
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<p>I first created 2 docker containers on my <a href="https://gist.github.com/SrIzan10/50bc2ba689a4cc43bcbac2799cc733c9">main Ryzen machine</a>'s WSL Ubuntu instance.</p>
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<p>I created a <code>docker-compose.yml</code> file with the following content:</p>
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<pre><code class="language-yml">version: "3.8"
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services:
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mongo1:
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image: mongo:4.4.17-rc0-focal
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container_name: mongo1
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restart: always
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ports:
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- 27017:27017
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volumes:
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- ./mongo1:/data/db
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command: mongod --replSet mongoset
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networks:
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- mongo
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mongo2:
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image: mongo:4.4.17-rc0-focal
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container_name: mongo2
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restart: always
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ports:
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- 27018:27017
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volumes:
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- ./mongo2:/data/db
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command: mongod --replSet mongoset
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networks:
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- mongo
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networks:
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mongo:
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</code></pre>
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<p>and ran it with <code>docker compose up -d</code>.</p>
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<p>I went to connect with MongoDB Compass and it didn't work for some reason. I asked GPT and nothing. It looks like it accepted the connection but it won't connect, so I installed <code>mongosh</code> and tried to connect with that.</p>
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<pre><code class="language-bash">$ mongosh mongodb://localhost:27017
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</code></pre>
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<p>...and it worked! That didn't make any sense, but okay, we can work with it.</p>
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<p>I then connected to the <code>mongo1</code> instance and ran the following commands:</p>
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<pre><code class="language-bash">> rs.initiate()
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</code></pre>
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<p>and it worked, but only that same database connected. Before adding the second database to the replica, I went ahead and pinged it from the first container (just to check if the network configuration worked):</p>
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<pre><code class="language-bash">docker exec mongo1 sh -c "rm /bin/ping;apt update;apt install inetutils-ping -y;ping mongo2"
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</code></pre>
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<p>I removed /bin/ping because I tried to transfer the binary from WSL to the container but it still needed some libraries and I didn't want to bother, so I just installed the package.</p>
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<p>It worked, so I went ahead and added the second database to the replica set:</p>
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<pre><code class="language-bash">> rs.add("mongo2")
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</code></pre>
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<p>After waiting for it, the second database connected and everything was working fine. Let's create a collection and some documents on the primary replica (mongo1):</p>
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<pre><code class="language-bash">> use test
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> db.createCollection("test")
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> db.test.insertOne({ name: "test" })
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</code></pre>
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<p>and then, let's check if it's on the second replica (mongo2):</p>
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<pre><code class="language-bash">$ mongosh mongodb://localhost:27017
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</code></pre>
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<pre><code class="language-bash">> use test
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> db.getMongo().setReadPref("secondaryPreferred")
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> db.test.find()
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</code></pre>
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<p>and, yeah, that worked.</p>
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<p>I don't really know if ORMs will read when connecting to the second replica, but for now it's fine as the main plan is on track.<br>So, to promote I connected to the primary replica (mongo1) and ran the following command:</p>
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<pre><code class="language-bash">> rs.stepDown()
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</code></pre>
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<p>And that worked! Woo! The second replica is now the primary one. We can now start <em>drum rolls please</em>:</p>
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<h2>The migration</h2>
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<p>This is it. We're doing it.</p>
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<p>I went ahead and created a new docker-compose file on my server with the following content:</p>
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<pre><code class="language-yml">version: "3.8"
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services:
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mongo:
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image: mongo:4.4.17-rc0-focal
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container_name: mongodb
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restart: unless-stopped
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ports:
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- 27017:27017
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volumes:
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- ./mongo:/data/db
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command: mongod --replSet rs0
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</code></pre>
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<p>After deploying the stack, I connected using mongosh to the primary db and ran the following command:</p>
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<pre><code class="language-bash">> rs.add("ip")
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</code></pre>
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<p>and after waiting for a while it looked like it worked. I then connected to the new database and ran the following command to check if the replica cloned fine:</p>
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<pre><code class="language-bash">> db.getMongo().setReadPref("secondaryPreferred")
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</code></pre>
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<p>and let's just let the results speak for themselves:</p>
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<pre><code class="language-bash">rs0 [direct: secondary] test> show dbs
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# author's note: some dbs are redacted for privacy reasons
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admin 80.00 KiB
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api 80.00 KiB
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ava 40.00 KiB
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bask 168.00 KiB
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config 144.00 KiB
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local 348.00 KiB
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vinci 428.00 KiB
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rs0 [direct: secondary] test> use vinci
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switched to db vinci
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rs0 [direct: secondary] vinci> show tables
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afk
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birthdays
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chatgpt
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giveaways-enters
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giveaways-message
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padyama
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suggestions
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twitter
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warns
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youtube
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rs0 [direct: secondary] vinci> db.afk.find()
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[
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{
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_id: ObjectId("sadfsad fsadfsdf"),
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id: 'redacted',
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reason: 'redacted',
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__v: 0
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},
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{
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_id: ObjectId("asdfsadfadf"),
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id: 'redacted',
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reason: 'readacted',
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__v: 0
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}
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]
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rs0 [direct: secondary] vinci>
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</code></pre>
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<p>Nice. let's now try to write something to the database from Vinci:<br><img src="https://img.srizan.dev/Discord_a2iXkWYxwn.png" alt=""><br>That just worked and we can see it on the secondary replica:</p>
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<pre><code class="language-bash">rs0 [direct: secondary] vinci> db.afk.find({ id: '703974042700611634' })
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[
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{
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_id: ObjectId("6550eccc6154a8c9030fe76a"),
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id: '703974042700611634',
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reason: 'test',
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__v: 0
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}
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]
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</code></pre>
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<p>Let's now edit all .envs and change the database url to the new secondary one. For this I checked all dbs that I have and then go from top to bottom editing the secrets.</p>
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<p>After that was done I needed to deploy all changes. I went ahead and created too many tabs on my terminal and ran the all deployment commands on each tab. At the same time.<br>I really hope that doesn't make my server run out of ram, because I'm really short on that.</p>
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<p>After executing all the commands I <code>rs.stepDown()</code>'ed the primary Raspberry Pi replica and, as expected, the HP Server took over.</p>
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<p>The last command of the day:</p>
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<pre><code class="language-bash">> rs.remove("ip")
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</code></pre>
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<p>...SIKE! I needed to check the logs of the containers to see if everything was working fine. The <code>api</code> and <code>vinci</code> to be exact.<br>This is because <code>api</code> runs Prisma and <code>vinci</code> runs the now defunct in my stack, <a href="https://mongoosejs.com/">mongoose</a>.</p>
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<p>Luckily enough, both were fine, so I was free. Yay!</p>
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<h2>Conclusion</h2>
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<p>Welp, that was a lot of work. I'm glad it's over. I got my HP server on July and it's now November and I just finished migrating.<br>Could I have done it in less time? Yes.<br>Was I lazy? Also yes.</p>
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<p>So that answers all your questions.</p>
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<p>I hope you enjoyed this my first blog post, and thankfully it was a big one.<br>This took 3 hours in total, but at the end of the day, it was worth it.</p>
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<p>I'll see you in the next one!</p>
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]]></content:encoded>
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</item>
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<item>
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<title><![CDATA[Welcome to my new blog!]]></title>
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<link>https://srizan.dev/blog/1</link>
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<guid>https://srizan.dev/blog/1</guid>
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<pubDate>Sat, 19 Aug 2023 22:00:00 GMT</pubDate>
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<description><![CDATA[This post welcomes you to my new blog]]></description>
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<content:encoded><![CDATA[<h1>Hey!</h1>
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<p>This is probably the last time I'm going to make a blog. I've made a few in the past, but I've never really stuck to them. I'm hoping that this time will be different.<br>This one was made entirely from scratch using React and Markdown, initially trying to use MDX, but it was a pain to set up, and it didn't end up working in the end.<br>I'm hoping to post about my projects, and maybe some other stuff too. I'm not sure yet, but I'll figure it out as I go along.<br>Anyways, thank you for reading. I hope you enjoyed my UX/UI for this one!</p>
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<p>PD: I need some help for making the blog text look good and readable, so hit me up on my Discord if you have any ideas.</p>
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]]></content:encoded>
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