2024-04-04 13:36:51 +02:00
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Metadata of the DGNum infrastructure
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====================================
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# DNS
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The DNS configuration of our infrastructure is completely defined with the metadata contained in this folder.
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The different machines have records pointing to their IP addresses when they exist:
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- $node.$site.infra.dgnum.eu points IN A $ipv4
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- $node.$site.infra.dgnum.eu points IN AAAA $ipv6
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- v4.$node.$site.infra.dgnum.eu points IN A $ipv4
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- v6.$node.$site.infra.dgnum.eu points IN AAAA $ipv6
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Then the services hosted on those machines can be accessed through redirections:
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- $service.dgnum.eu IN CNAME $node.$site.infra.dgnum.eu
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or, when targeting only a specific IP protocol:
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- $service4.dgnum.eu IN CNAME ipv4.$node.$site.infra.dgnum.eu
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- $service6.dgnum.eu IN CNAME ipv6.$node.$site.infra.dgnum.eu
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Extra records exist for ns, mail configuration, or the main website but shouldn't change or be tinkered with.
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# Network
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The network configuration (except the NetBird vpn) is defined statically.
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TODO.
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# Nixpkgs
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2024-12-08 11:52:26 +01:00
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Machines can use different versions of NixOS, the supported ones are specified here.
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2024-04-04 13:36:51 +02:00
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2024-06-06 11:39:20 +02:00
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## How to add a new version
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- Switch to a new branch `nixos-$VERSION`
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- Run the following command
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```bash
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npins add channel nixos-$VERSION
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```
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- Edit `meta/nixpkgs.nix` and add `$VERSION` to the supported version.
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- Read the release notes and check for changes.
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- Update the nodes versions
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- Create a PR so that the CI check that it builds
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2024-04-04 13:36:51 +02:00
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# Nodes
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The nodes are declared statically, several options can be configured:
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- `deployment`, the colmena deployment option
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- `stateVersion`, the state version of the node
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2024-12-08 11:52:26 +01:00
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- `nixpkgs`, the version and sytem of NixOS to use
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2024-04-04 13:36:51 +02:00
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- `admins`, the list of administrators specific to this node, they will be given root access
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- `adminGroups`, a list of groups whose members will be added to `admins`
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- `site`, the physical location of the node
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- `vm-cluster`, the VM cluster hosting the node when appropriate
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Some options are set automatically, for example:
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- `deployment.targetHost` will be inferred from the network configuration
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- `deployment.tags` will contain `infra-$site`, so that a full site can be redeployed at once
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# Organization
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The organization defines the groups and members of the infrastructure team,
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one day this information will be synchronized in Kanidm.
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## Members
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For a member to be allowed access to a node, they must be defined in the `members` attribute set,
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and their SSH keys must be available in the keys folder.
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## Groups
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Groups exist only to simplify the management of accesses:
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- The `root` group will be given administrator access on all nodes
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- The `iso` group will have its keys included in the ISOs built from the iso folder
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Extra groups can be created at will, to be used in node-specific modules.
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# Module
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The meta configuration can be evaluated as a module, to perform checks on the structure of the data.
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