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List Docker Images

docker images

List All Docker Images

docker images -a

List dangling images (orphan images)

docker images -f dangling=true

Remove dangling images

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Get all pods in a namespace

kubectl get pods --namespace=kube-system

Get all services in a namespace

kubectl get services --namespace=kube-system

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Kafka Topic Commands

bin/kafka-topics.sh --list --zookeeper 172.19.0.8:2181

bin/kafka-topics.sh --describe --zookeeper 172.19.0.8:2181 --topic customChannel

bin/kafka-topics.sh --zookeeper 172.19.0.8:2181 --delete --topic customChannel

bin/kafka-topics.sh --create --zookeeper 172.19.0.8:2181 --replication-factor 1 --partitions 1 --topic greetings

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Create new Private and Public key on Host machine (Ex.macOS)

$ssh-keygen -t rsa
# Enter location and file name like (/Users/pjadda/.ssh/minishift_rsa), do not use default files
#Passphrase is optional

Create .ssh folder in Guest OS even if it exists

$ssh docker@192.168.64.3 mkdir -p .ssh

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Git Commands and Tips

Enable Git autocomoplete in macOS or Ubuntu

1. Download git autocompletion script using following CURL command

curl https://raw.githubusercontent.com/git/git/master/contrib/completion/git-completion.bash -o ~/.git-completion.bash

2. Open ~/.bash_profile file (~/.bash_rc if use Linux) and add the following

if [ -f ~/.git-completion.bash ]; then
 . ~/.git-completion.bash

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Create Windows bootable drive on macOS

1. Download Windows ISO (Windows 7 or latest) from Official Windows store
2. Once download finished, double click on ISO image. Mac will mount this ISO images in Volumes.
3. Skip to step 5 if you like command line options. Open 'Disk Utility' application, select your USB device under 'external' category. Look for field Device and copy that value (ex. disk4)
4. Right click on your device and select Erase then use following information to fill popup window

Name => WINDOWS10
Format => MS-DOS (FAT)
Scheme => GUID Partition Map

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MySQL Change password on Ubuntu when default password not provided

1. Open terminal and tyfollowing commands one by one. Do not close the terminal after you are done

sudo mysql
USE mysql;
UPDATE user SET authentication_string=PASSWORD('YOUR_PASSWORD') WHERE User='root';
UPDATE user SET plugin="mysql_native_password";
FLUSH PRIVILEGES;
quit;

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Create NIC and assign IP Address

VBoxManage hostonlyif create

VBoxManage hostonlyif ipconfig vboxnet0 --ip 192.168.56.1 --netmask 255.255.255.0

Remove NIC from VM

VBoxManage hostonlyif remove

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Maven Install Directions on macOS

$ brew update
$ brew install maven

Check version

$mvn -v

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Configure Spring Boot Application to serve Custom Static Resource locations

Static resources can be configured using two approaches in Spring Boot

• Add custom path in application.properties/application.yaml
• Implement WebMvcConfigurer addResourceHandlers() method

First configure your SpringSecurity class to accept requests to this resources

@Override
public void configure(WebSecurity web)