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Monolith

The Monolithic Ball of Mud

• The Ball Of Mud represents the worst case scenario for a Monolith. Also called as Spaghetti Code.
• No clear isolation in the application.
• Complex dependencies where everything depends on every other thing.
• Hard to understand and harder to modify.

Cleaning Up The Ball Of Mud

• To clean up the ball of mud we introduce isolation into the application by dividing the application along clear domain boundaries.
• We introduce packages and libraries that help isolate related pieces of code. They provide a clean and consistent interface.

vezril

Applied Functional Programming with Scala - Notes

Copyright © 2016-2018 Fantasyland Institute of Learning. All rights reserved.

1. Mastering Functions

A function is a mapping from one set, called a domain, to another set, called the codomain. A function associates every element in the domain with exactly one element in the codomain. In Scala, both domain and codomain are types.

val square : Int => Int = x => x * x

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# MAP, translates and/or encapsulates IPv4 to IPv6
# LW4o6, configured as a mapping table

MAP is implemented in VPP. vnet/vnet/map and vnet/vnet/ip (ip_frag.[ch])

Why is VPP good at being a MAP-BR (or LW4o6)
    - Provides over-the-top service
        Runs on servers

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# Buffer metadata

Spatioal layout

    struct rte_mbuf - dpdk buffer metadata
    vlib_buffer_t - vpp buffer metadata as rte_mbuf_pvt data


### DPDK Integration

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curl -4 http://wttr.in/SanJose

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/* FDIO Training Day 2 */

// The zero drop rate of the IETF is like rat feces in the food industry, you have a certain part per million. We don't have rat feces.

// Macswap

important directories:
    build-root
    dpdk
    vlib

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VPP does prefetching in d-cache

Graph - Composed at runtime
Nodes - functional blocks of code in the graph, i.e. ethernet-input connected together via arcs
Nodes are called via their dispatch function
    Think of it as the node's main()

# Connection VMs via PCI

lshw -class network -businfo

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dd if=/dev/zero of=testfile_10MB bs=10485760 count=1

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# Two hosts. HostA (source) to HostB (destination)
#
# On HostB
# -p 2222, open on port 2222
# -l, listen mode
# bzip2 -d, decompress stream using bzip2
# dd of=image.iso, destination file

(hostb)# netcat -p 2222 -l |bzip2 -d | dd of=image.iso

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# Add missing gerrit end point
git remote add gerrit git@url.url