How to Patch yaml from str into Deployment CR ?

[ppsite]

apiVersion: annomate.fun/v1
kind: AnnoTemplate
metadata:
  name: log-sidecar
  namespace: default
spec:
  kind: SideCar
  template: |
    - name: log-tail
      image: registry.cn-hangzhou.aliyuncs.com/log-service/logtail:latest
      command:
      - sh
      - -c
      - /usr/local/ilogtail/run_logtail.sh 10
      volumeMounts:
      - name: nginx-log
        mountPath: /var/log/nginx

async fn reconcile(obj: Arc<Deployment>, _ctx: Arc<()>) -> Result<Action> {
    info!("reconcile : {}", obj.name_any());
    let client = Client::try_default().await.unwrap();
    let deployments: Api<Deployment> = Api::all(client.clone());
    let anno_templates: Api<AnnoTemplate> = Api::all(client.clone());

    for anno in obj.metadata.annotations.iter() {
        for k in anno.keys() {
            if k.starts_with("annomate.fun") {
                let name = k.split("/").last().unwrap();
                info!("name: {}", name);
                let lp = ListParams::default().fields(&format!("metadata.name={}", name));
                for anno_template in anno_templates.list(&lp).await.unwrap() {
                    let yaml_objs: Value =
                        serde_yaml::from_str(&anno_template.spec.template).unwrap();
                    info!("-----> : {:?}", yaml_objs[0]["name"]);
                    // TODO 
                }
            }
        }
    }

    Ok(Action::await_change())
}

Business Logic

Use Controller to watch Deployment annotations if any item start with annomate.fun, according to this item and filter AnnoTemplate CRD, finally merge template into Deployment;

Ask 4 Help

As code above, I can get anno_template.spec.template, Now How can i patch the yaml into Deployment as Sidecar ?

[mateiidavid]

Hey @ppsite. Repeating a few things to see if I understand it correctly.

• You have a deployment reconciler
• You have a CRD (AnnoTemplate) that you want to read. This is conditional on some annotation being present on the deployment.
• You want to apply the template in the CRD to the deployment.

You will need to generate a patch, as you've noted in the title. The examples directory contains a few different examples that apply patches differently. There's also an example in the docs on how to create a patch via serde_json.

You'll need to find a way to construct a spec that you want to patch (for example by pushing to the deployment's existing containers list every time you read and deserialize an anno template) and at the end apply the patch according to your preferred strategy.

I do want to mention that for Deployment objects that need to have their template changed whenever they are created / update, I find MutatingWebhooks to be a better fit. You can intercept the creation request and modify the template before the deployment is written to etcd, so you don't need to re-roll any of your pods. There's an example on using admission servers.

[ppsite]

(^▽^) Thanks for your help, this gives me a Directional guidance