Interview questions: 2020-12

• Terraform
• provider vs provisioner
• Load balancing
• Network Load Balancer vs Application Load Balancer 
• Networking
• Layer 1 vs Layer 4
• haproxy uses which layer?
• Database
• Mysql
• myisamchk
• what does it do?
• Open source databases: MySQL, Postgres, Mongodb
• 
  

iftop config

~/.iftoprc

interface: eth0 # The interface to monitor
log-scale: no # Use a logarithmic scale for bar graphs.
max-bandwidth: 2M # Fixes the maximum for the bar graph scale to bw, e.g. "10M". In bits
dns-resolution: yes # Controls reverse lookup of IP addresses.
port-display: on # Controls display of port numbers.
port-resolution: yes # Controls conversion of port numbers to service names.

git: delete local and remote branch

git branch -d feature/666

git push origin --delete feature/666

k8s ssl cert loading as secret

kubectl --cert=/tmp/tls.crt --key=/tmp/tls.key create secret tls tls-wc-ingress

git forks and upstreams

• https://help.github.com/en/articles/configuring-a-remote-for-a-fork
• https://help.github.com/en/articles/syncing-a-fork
• https://help.github.com/en/articles/changing-a-remotes-url

Connection with Jedis to passworded, "in-transit" encrypted AWS Elasticache Redis instance

import redis.clients.jedis.Jedis;

public class RedisStringJava {
   public static void main(String[] args) {
      Jedis jedis = new Jedis("master.redis-poc-single-01.eeeeee.use1.cache.amazonaws.com", 6379, true);
      jedis.auth("mypassword");
      System.out.println("Connection to server sucessfully");
      jedis.set("tutorial-name", "Redis tutorialz");
      // Get the stored data and print it
      System.out.println("Stored string in redis:: "+ jedis.get("tutorial-name"));
   }
}

updatedb / locate on Mac

sudo /usr/libexec/locate.updatedb