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# Server installation
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## DNS configuration
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One domain and one subdomain must point to the IP address of a [dedicated server](server-requirements.md).
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| FQDN | Record type | Address |
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| -------------- | ----------- | ------- |
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| [[DOMAIN]] | A | X.X.X.X |
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| git.[[DOMAIN]] | A | X.X.X.X |
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## Network configuration
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### Inbound
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| Port | Transport | Application |
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| ---- | --------- | ---------------- |
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| 22 | TCP | SSH |
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| 80 | TCP, UDP | HTTP/(1.1, 2, 3) |
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| 443 | TCP, UDP | HTTP/(1.1, 2, 3) |
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| 521 | TCP | SSH |
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### Outbound
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| Port | Transport | Application |
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| ---- | --------- | ----------- |
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| 465 | TCP | SMTP |
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### OS installation
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Download and boot the ISO image `amd64` of [Debian](https://www.debian.org/distrib/netinst)
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Select :
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- "Advanced options ..."
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- "... Automated install"
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The network is automatically configured with DHCP, you can also configure it manually.
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At the prompt "Location of initial preconfiguration file:", enter the url :
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```
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raw.githubusercontent.com/01-edu/public/master/scripts/preseed.cfg
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```
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and select "Continue", let us know when the server's remote access is ready, we will configure it.
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