mehdihasan

Automate container and image cleanup

To automatically delete Docker containers and images older than 15 days, we can set up a cron job that runs a script at specified intervals.

Step 1: Create a Cleanup Script

Create a file named docker-cleanup.sh with the following content:

#!/bin/bash

mehdihasan

Install OC client in Ubuntu/Debian

Get the oc client download URL

Go to this link to get your desired version of the OC client tool. I have choosen the latest version available in July, 2020.

https://github.com/openshift/okd/releases/download/4.5.0-0.okd-2020-07-14-153706-ga/openshift-client-linux-4.5.0-0.okd-2020-07-14-153706-ga.tar.gz

Download the package

mehdihasan

sudo apt install software-properties-common
sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt update
sudo apt install python3.8
python --version
python3 --version
sudo apt update
sudo apt install build-essential zlib1g-dev libncurses5-dev libgdbm-dev libnss3-dev libssl-dev libreadline-dev libffi-dev wget
sudo apt install python3-pip

mehdihasan

How to deploy application in GCP: App Engine

Handy Commands

You can list the active account name with this command:

gcloud auth list

You can list the project ID with this command:

mehdihasan

Application Deployment and Scale in Kubernetes Engine (GCP)

PREPARING THE ENVIRONMENT

1. In GCP console, on the top right toolbar, click the Open Cloud Shell button.

2. Click Continue.

3. For convenience, place the zone that Qwiklabs assigned you to into an environment variable called MY_ZONE. At the Cloud Shell prompt, type this partial command:

mehdihasan

Benchmark commands

Producer

Setup

bin/kafka-topics.sh \
  --zookeeper zookeeper.example.com:2181 \
  --create \

mehdihasan

Kafka in Openshift in Ubuntu

Installing Docker

install docker

wget -qO- https://get.docker.com/ | sh

adding your user to the "docker" group:

mehdihasan

Kafka frequent commands

Assuming that the following environment variables are set:

• KAFKA_HOME where Kafka is installed on local machine (e.g. /opt/kafka)
• ZK_HOSTS identifies running zookeeper ensemble, e.g. ZK_HOSTS=192.168.0.99:2181
• KAFKA_BROKERS identifies running Kafka brokers, e.g. KAFKA_BROKERS=192.168.0.99:9092

Server

Start Zookepper and Kafka servers

mehdihasan

Displaying Basic System Information on Linux Shell

uname

Output:

Result of uname command

mehdihasan

Install minishift in Ubuntu

OS: Ubuntu 19.10

Install libvirt and qemu-kvm on the system

sudo apt install qemu-kvm libvirt-daemon libvirt-daemon-system