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Adrien Beaudouin
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content/posts/02-build-your-own-docker-swarm-cluster/index.md
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@ -131,7 +131,7 @@ my-app-01 -.-> files
my-app-02 -.-> files
{{< /mermaid >}}
Note as the hostnames correspond to a particular type of server, dedicated for one task specifically. Each type of node can be scale as you wish :
Note as the hostnames correspond to a particular type of server, dedicated for one task specifically. Each type of node can be scaled as you wish :
| replica | description |
| ------------ | -------------------------------------------------------------------------------------------------------- |
@ -141,14 +141,14 @@ Note as the hostnames correspond to a particular type of server, dedicated for o
| `data-0x` | The hard part for data **HA**, with GlusterFS replications, DB clustering for PostgreSQL and MySQL, etc. |
{{< alert >}}
For a simple production cluster, you can start with only `manager-01` and `data-01` as absolutely minimal start.
For a simple production cluster, you can start with only `manager-01` and `data-01` as minimal start.
For a development perspective, you can skip `worker-01` and use `manager-01` for production running.
You have plenty choices here according to your budget !
{{< /alert >}}
## Cheap solution with Hetzner VPS 🖥️
Here some of the cheapest VPS options we have :
Here some of the cheapest VPS options we have at this time of writing (**02/2022**) :
| Server Type | Spec | Price |
| ---------------- | ---------- | --------- |
@ -156,23 +156,21 @@ Here some of the cheapest VPS options we have :
| **CX21 (Intel)** | 3C/4G/80Go | **€5.88** |
| **CPX21 (AMD)** | 3C/4G/80Go | **€8.28** |
My personal choice for a good balance between cheap and well-balanced cluster :
My personal choice for a cheap yet well-balanced cluster :
| Server Name | Type | Why |
| ------------ | --------------------- | -------------------------------------------- |
| `manager-01` | **CX21** | I'll privilege RAM |
| `runner-01` | **CPX11** | 2 powerful core is better for building |
| `worker-01` | **CX21** or **CPX21** | Just a power choice matter for your app |
| `data-01` | **CX21** or **CPX21** | Just a power choice matter for your database |
| Server Name | Type | Why |
| ------------ | --------------------- | -------------------------------------------------------------------- |
| `manager-01` | **CX21** | I'll privilege RAM for running many management based container tools |
| `worker-01` | **CX21** or **CPX21** | Just a power choice matter for your app |
| `runner-01` | **CPX11** | 2 powerful EPYC core is better for fast app building |
| `data-01` | **CX21** or **CPX21** | Just a power choice matter for your databases |
We'll take additional volume of **60 Go** for **€2.88**
We'll take additional volume for `data-01` of **20 Go** for **€0.96**. So we finally arrive to following respectable budget range : **€23.39** - **$29.39**.
We finally arrive to following respectable budget range : **€25.31** - **$31.31**
The only difference being choice between **Xeon VS EPIC** as CPU power for `worker` and `data` nodes, which will our main production application nodes. A quick [sysbench](https://github.com/akopytov/sysbench) will indicates around **70-80%** more power for AMD (test date from 2022-02).
The main difference is choice between **Xeon VS EPIC** as CPU for `worker-01` and `data-01` nodes, which will our main critical production application nodes. A quick [sysbench](https://github.com/akopytov/sysbench) will indicates around **70-80%** more power for AMD (test date from 2022-02).
Choose wisely according to your needs.
If you don't need of `worker` and `runner` nodes, with only one simple standalone docker host without Swarm mode, you can even go down to **€14,64** with only **2 CX21** in addition to volume.
Note as a Swarm node with *manager* role can act as a *worker* as well. So if you're very budget limited, you can eventually skip `worker-01` and `runner-01` nodes, with only one simple standalone docker host (no Swarm mode). So you can go down to **€14,64** with only **2 CX21** in addition to volume.
{{< alert >}}
If you intend to have your own self-hosted GitLab for an enterprise grade CI/CD workflow, you should run it on node with **8 GB** of RAM.