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persistence:
  enabled: true
  accessModes:
    - ReadWriteOnce
  size: 5Gi

datasources: 
 datasources.yaml:
   apiVersion: 1
   datasources:

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Tmux keyboard shortcut

• Space : Switch pane from vertical align to horizontal.

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!Home page all videos page
youtube.com##ytd-browse.ytd-page-manager.style-scope

!Suggestion by youtube
youtube.com###related

!Removes comments
##.ytd-comments.style-scope

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Ref:

• [https://kubernetes.io/docs/concepts/cluster-administration/networking/)(https://kubernetes.io/docs/concepts/cluster-administration/networking/)

---

• We have two worker nodes, able to communicate with each other.
• Each nodes have multiple pods running and each pod is able to communicate with any other pod in any other node(till node is accessible)

3 Basic requirements that kubernetes has put are:

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Configure a Linux bridge interface

• In computer networking, a bridge is a network device that interconnects more than one LAN segment at Layer-2.
• This bridge functionality is built into the Linux kernel, so one can set up a software bridge interconnecting multiple network interfaces.

A Linux bridge can be created with a user-space command-line tool called brctl which allows you to create, remove and administer Linux Ethernet bridges.

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In backend of all docker networking:

• When the daemon instantiates the container, it assigns a unique network address to it, connecting it to a virtual Ethernet bridge, which in the case of Docker is called docker0.
• All containers in the system communicate with each other by directing packets to docker0, which then forwards those packets through the subnet automatically.

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Ref: http://www.ieee802.org/1/files/public/docs2008/new-dcb-ko-VEB-0708.pdf

Virtualization Intermediaries (VIs) are used to safely share IO.

• That is, 1 or more OSs share the PCI device through the VI.
• VI may be part of Hypervisor or not.

The VI(docker0) performs Ethernet sharing functions:

• Multiplexes flows from multiple OSs.
• Performs PCI IO transactions on behalf of the OS;

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(Reference)

• https://www.digitalocean.com/community/tutorials/a-deep-dive-into-iptables-and-netfilter-architecture
• https://www.karlrupp.net/en/computer/nat_tutorial
• https://goyalankit.com/blog/iptables
• http://ipset.netfilter.org/iptables.man.html

---

Iptables interfaces with the kernel's netfilter packet filtering framework, it works by interacting with the packet filtering hooks, these kernel hooks are known as the netfilter framework.

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AWS CLI

• Get ec2 instance with name and private ip: aws ec2 describe-instances --query "Reservations[*].Instances[*].[InstanceId,Tags[?Key=='Name']| [0].Value,PrivateIpAddress]" --output table

• Get instance details in some human readable format: aws ec2 describe-instances --query 'Reservations[*].Instances[*].{ID:InstanceId,TYPE:InstanceType,Subnet:SubnetId,VPC:VpcId,IP:PublicDnsName,State:State.Name }' --output table

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