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34 lines
1.6 KiB
34 lines
1.6 KiB
3 years ago
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# Concepts
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## Nodefilters
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### About
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Nodefilters are a concept in k3d to specify which nodes of a newly created cluster a condition or setting should apply to.
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### Syntax
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The overall syntax is `@<group>:<subset>[:<suffix]`.
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- `@` denotes the start of a nodefilter in a k3d flag value
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- `<group>` denotes the node group you want to filter in
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- one of `server`, `servers`, `agent`, `agents`, `loadbalancer`, `all`
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- note, that `all` also includes the cluster-external server loadbalancer (`k3d-proxy` container)
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- `<subset>` denotes the subset of the chosen group you want to apply the flag to
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- wildcard `*`: all nodes in that group
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- index, e.g. `0`: only the first node of that group
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- list, e.g. `1,3,5`: nodes 1, 3 and 5 of that group
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- range, e.g. `2-4`: nodes 2 to 4 of that group
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- `<suffix>` (optional) can hold some flag specific configuration
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- e.g. for the `--port` flag this could be `direct` or `proxy` (default) to configure the way of exposing ports
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### Example
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- Problem: You want to have Nginx as your ingress controller, but by default, K3s deploys Traefik.
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- Solution: Disabling the default Traefik deployment using K3s' `--disable=traefik` flag.
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- Note: It's enough to do this on the first (initializing) server node.
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- How-To: `k3d cluster create notraefik --k3s-arg="--disable=traefik@server:0"`
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- Looking at `--k3s-arg="--disable=traefik@server:0"`, everything after the `@` sign is part of the nodefilter.
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- `server` is the node group: server nodes
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- after the `:` follows the subset, which in this case is the index `0`: the first server node to be created (`k3d-notraefik-server-0`)
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