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Run cluster from config

k3d cluster create --config k3d_cluster_config.yaml

Host configuration

sudo echo "127.0.0.1 k3d.localhost" >> /etc/hosts

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Cluster

• Show cluster info

kubectl cluster-info

• List all nodes in cluster and show IPs

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Generate RSA 1024 bit key:

openssl genrsa -out private_key.pem 1024

Get public key from private:

openssl rsa -in private_key.pem -pubout -out public_key.pem

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Copy the public key to clipboard

Linux

ssh-keygen -f private.pem -y | xclip

macOS

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PostgreSQL

Connecting to database

psql -h <host> -U <username> <database-name>

or

psql -h <host> -U <username> -l

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Show octal file permissions in Linux

stat -c '%A %a %n' *

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@Slf4j
@Configuration
@RequiredArgsConstructor
public class DocumentDBConfig extends AbstractMongoClientConfiguration {


    private static final String CERT_FILE_PATH = "document-db-certs/rds-combined-ca-bundle.pem";
    private static final String END_OF_CERTIFICATE_DELIMITER = "-----END CERTIFICATE-----";
    private static final String CERTIFICATE_TYPE = "X.509";
    private static final String TLS_PROTOCOL = "TLS";

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1. Insert a single document

db.products.insertOne({ name: 'Product 1', price: 200 })

2. Insert multiple documents - Ordered

db.products.insertMany([{ name: 'Product 1', price: 200 }, { name: 'Product 2', price: 100 }])

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Make encrypted file with a gpg extension

When executing command, it prompts you to enter passphrase.

  gpg --symmetric --cipher-algo aes256 filename.ext

Decrypt file

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SSH key types

RSA: It depends on key size. If it has 3072 or 4096-bit length, then you’re good. But 2048 bit keys are indeed acceptable until 2030.

How many bits my ssh key is:

    ssh-keygen -l -f ~/.ssh/{key_name}.pub