INT 21h

Hi, I am Vladimir Smagin, SysAdmin and

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Warm Image operator for Kubernetes

№ 11010 В разделе Sysadmin от May 28th, 2020,
В подшивках: Go, Kubernetes, Kubernetes Operator, Operator SDK

For example, you have huge image with your software and running POD on node. When POD moving to another node your image downloads to new node minute or two. This operator forces nodes to download image before rescheduling, so POD starts faster.

It runs /bin/sh with infinite loop on specified image as DaemonSet with additional options like NodeSelector, Affinity or resource limits. You can specify custom command if your image not contains /bin/sh interpreter or you want to run own script.

Your first warmer:

apiVersion: blindage.org/v1alpha1
kind: WarmImage
metadata:
  name: mongo4
spec:
  image: mongo
  version: "4"
  nodeSelector:
    node-role.kubernetes.io/master: ""

Now you warmed mongo:4 on all master nodes.

Repository here https://git.blindage.org/21h/warm-image-operator

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CronJobs operator for Kubernetes

№ 10306 В разделах: Programming Sysadmin от September 17th, 2019,
В подшивках: Go, Kubernetes, Kubernetes Operator, Operator SDK

Helps to control multiple cronjobs with same image, but different commands.

Checkout code and documentation https://git.blindage.org/21h/cron-operator

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Fast bootstrap of Operator SDK and your first project

№ 10268 В разделе Programming от August 30th, 2019,
В подшивках: Go, Operator SDK

1) Install operator-sdk on your computer https://github.com/operator-framework/operator-sdk/blob/master/doc/user/install-operator-sdk.md. I prefer to install into $GOPATH/bin.
2) create script somewhere like /opt/bootstrap_operator.sh

#!/bin/bash
set -e

REPO="git.blindage.org/21h/redis-operator"
API_VERSION="blindage.org/v1alpha1"
KIND="Redis"
NAME="redis-operator"

# operator sdk
export GO111MODULE=on
echo "Bootstraping ${NAME}"
operator-sdk new ${NAME} --git-init --repo ${REPO} --verbose
cd ${NAME}
echo "Adding API ${API_VERSION}"
operator-sdk add api --api-version=${API_VERSION} --kind=${KIND} --verbose
echo "Creating controller"
operator-sdk add controller --api-version=${API_VERSION} --kind=${KIND} --verbose

3) change directory to your “~/dev” and run script bash /opt/bootstrap_operator.sh, it will create new directory “~/dev/redis-operator”

4) build your new operator, pack to image operator-sdk build redis-operator

5) push new image to registry with docker push myregistry.ru/redis-operator

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