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feat: add ability to ship k3s container logs via vector

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If a global vector-sink property on the logs plugin is set, we will use that to configure a log sink (defaulting to console output otherwise). Note that the actual configuration still needs to be a valid DSN representing a Vector log sink.

While this does not support pinning log sinks to specific apps, it opens up integration for those who use a single k3s cluster in shared tenancy.
This commit is contained in:
Jose Diaz-Gonzalez
2025-04-14 04:35:21 -04:00
parent fa55f38258
commit b97e8f3601
9 changed files with 157 additions and 54 deletions
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16
docs/deployment/schedulers/k3s.md
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@@ -531,7 +531,7 @@ dokku scheduler-k3s:ensure-charts --force
Alternatively, a comma separated list of chart names can be specified to only force install the specified charts:
```shell
dokku scheduler-k3s:ensure-charts --force --chart-names cert-manager
dokku scheduler-k3s:ensure-charts --charts cert-manager
```
## Scheduler Interface
@@ -575,7 +575,19 @@ The following Dokku functionality is not implemented at this time.
### Logging support
App logs for the `logs` command are fetched by Dokku from running containers via the `kubectl` cli. Persisting logs via Vector is not implemented at this time. Users may choose to configure the Vector Kubernetes integration directly by following [this guide](https://vector.dev/docs/setup/installation/platforms/kubernetes/).
App logs for the `logs` command are fetched by Dokku from running containers via the Kubernetes api. While the `k3s` scheduler does not integrate with the `logs:vector-*` subcommands, it does respect the global `vector-sink` logs property. When that property is set, the `scheduler-k3s:ensure-charts` command can be utilized to reconfigure vector to ship kubernetes logs to the provided sink.
To setup log shipping, configure the global `vector-sink` property for the `logs` plugin.. Note that this can be run before _or_ after the `scheduler-k3s:ensure-charts` command - if run before, the `scheduler-k3s:ensure-charts` subcommand will pick up the value.
```shell
dokku logs:set --global vector-sink "console://?encoding[codec]=json"
```
Next, run the `scheduler-k3s:ensure-charts` command with the `vector` chart to force the `k3s` scheduler to reconfigure vector with the specified sink:
```shell
dokku scheduler-k3s:ensure-charts --charts vector
```
### Supported Resource Management Properties