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Minic

Download data from minio via an init container. Useful pre-loading volumes for stateful applications, or anything that needs data before the applications starts.

Parameters

Parameters are read from the following environment variables

  • MINIO_URL = address and port for the minio server. Does not need scheme.
  • ACCESSKEY = Minio access key
  • SECRETKEY = Minio secret key
  • SRC = Source of the files you wish to copy to your container. Takes form of bucketname/path/file or bucketname/path for all contents in a folder
  • DEST = Path to where you wish data to inside your container

Special note for the DEST paramert. If you are downloading all files from a dir, don't include that dir name in your DEST Value. For example. If you were downloading all the contents from users/roles do not make your destination /data/users/roles. Do make it /data/users. The roles directory will be created as part of the download.

Using it as init container in Kubernetes

Create Secret to Store Access and Secret Keys

Because the access key and secret key should not sit in plane text in a git repo or ConfigMap. These credential will be stored in Kubernetes as a Secret

kubectl create secret generic minio-creds --from-literal=accesskey=youraccesskeyhere --from-literal=secretkey=yoursecretkeyhere

Modify Container Spec

Include this in your current deployment. Modify the env values to match your environment. The name of the container can be changed to whatever you wish. Below example asssumes you already have a mount named db-storage in your main container. This should match where your primary container is going to read its data.

 initContainers:
  - name: data-loader
    image: jpweber/minio-init-dl
    env:
    - name: MINIO_URL
      value: "minio.k8sdev.example.com"
    - name: ACCESSKEY
      valueFrom:
        secretKeyRef:
          name: minio-creds
          key: accesskey
    - name: SECRETKEY
      valueFrom:
        secretKeyRef:
          name: minio-creds
          key: secretkey
    - name: SRC
      value: "training-data/foo/"
    - name: DEST
      value: "/data"
    volumeMounts:
    - mountPath: /data
      name: db-storage

Run locally for testing

Binary CLI

Set your variables like the example below

export MINIO_URL="192.168.2.66:9000"
export SRC="vectorizer/roles"
export ACCESSKEY="LEB3JJ3OCBN4HTDIS5IZ"
export SECRETKEY="xs3fx83cMkV7Oh+6jlGGTt9kTmT5D6yoQLm9+L5X"
export DEST="/tmp/minio-tests/examples"

Then you can run the binary with out any extra parameters

Docker Container

docker run -ti -v /tmp:/tmp \
-e MINIO_URL="192.168.2.66:9000" \
-e ACCESSKEY="LEB3JJ3OCBN4HTDIS5IZ" \
-e SECRETKEY="xs3fx83cMkV7Oh+6jlGGTt9kTmT5D6yoQLm9+L5X" \
-e SRC="vectorizer/roles" \
-e DEST="/tmp/minio-tests/examples/" \
jpweber/minio-init-dl:0.3.4