Linux Day Napoli 2018 - Credits to Marco Ferrigno - www.nalug.net

1. edited by Marco Ferrigno
The DevOps paradigm
the evolution of IT professionals and opensource toolkit
Linux Day Napoli 2018 || #ldna18
IT System Engineer | Linux Specialist | Cyber Security Expert | DevOps Consultant

2. Step 0Step 0
DevOps as method
slide keywords:
- communication
- cooperation

3. What else?What else?
slide keyword:
- continuous
|
|
integration
delivery

4. Perché sono cosi forti:Something else?Something else?
Dev
- Application Performance
APM (Application Performance Management) tools
to decrease latency and to have complete visibility
into code
- End User Analytics
Understand end users feedback
- Quality Code
need to ensure their deployment and new release
don't implode or degrade the overall performance
- Code Level Errors
when we have a large distributed application it is
vital to lower MTTR(Mean Time To Repair) by
finding the root cause of errors and exceptions
Ops
- Application Availability
the application need to be up and running and it is Ops
responsability to ensure uptime and SLA (service level
agreement) are in order
- Application Performance
classic Ops generally rely on infrastructure metrics while
modern Ops correlate all of those metrics with
application metrics to solve problems 10x faster
- End User Complaints
the goal is to know and fix problems before end users
complain, reduce the number of support tickets and
eliminate false alerts
- Performance Analytics
automatically generated baselines of the metrics help
Ops understand what has changed and where to focus
their troubleshooting efforts

5. Perché sono cosi forti:The DevOps roadThe DevOps road
Compiling apps from source (gcc, make ...)
Bash scripts Hard user editor (vi ...)
Commands/Tools
Text Manipulation Process Monitoring
System Performance
Network
Unix GNU/Linux
OSI model. TCP/IP/UDP/Common ports
Knowlege about different file system
Setting up a reverse proxy (Nginx ...)
Setting up a caching server (Squid, Nginx, Varnish.)
Setting up a load balancer (HAProxy, Nginx ...)
Setting up a firewall
TLS, STARTTLS, SSL, HTTPS, SCP, SSH, SFTP
Postmortem analysis
Apache
Nginx
Operating System Love for terminal Web Server
Caddy
basic knowledge
of infrastructures
and protocols

6. Perché sono cosi forti:The DevOps roadThe DevOps road
Docker rkt
AWS Azure
Kubernetes
Mesosphere
Mesos
Docker Swarm
Nomad
Cloud Containers
Rackspace
Google Cloud
Cloud Foundry
Heroku
Digital Ocean
LXC
Cluster Managers
/ Orchestrator

7. Perché sono cosi forti:The DevOps roadThe DevOps road
Nagios / Icinga PagerDuty
Jenkins Travis
AWS Cloud Formation
Terraform
Ansible
Puppet
Chef
CI/CD
Monitoring & Alerting
Drone
Bamboo
TeamCity
Graphite
Automation
Prometheus
Zabbix
Salt Stack
CF Engine

8. Perché sono cosi forti:The three Musketeers: CDThe three Musketeers: CD
- Continuous Deployment
A moment, wait! But continuous integration and continuous delivery?
Continuous integration (CI) usually refers to integrating, building, and testing code within the development environment.
The continuous integration pipeline should run on every commit or push. Unlike continuous delivery, continuous
integration does not have a clearly defined goal of that pipeline.
These steps:
✔ Pushing to the code repository
✔ Static analysis
✔ Pre-deployment testing
✔ Packaging and deployment to the test environment
✔ Post-deployment testing
And continuous delivery? A CI in which we trust, without any check!

9. Perché sono cosi forti:The three Musketeers: MicroservicesThe three Musketeers: Microservices
- Microservices
Destroy the monolithic thought: "dividi et impera"
The important thing to note is that due to the goals today’s competition sets in front of us (flexibility, speed, and so
on), microservices are probably the best type of architecture we can apply

10. Perché sono cosi forti:The three Musketeers: ContainersThe three Musketeers: Containers
- Containers
The definition of the word container is “an object for holding or transporting something”.
Most people associate containers with shipping containers.
The idea behind “software” containers is similar. They are isolated and immutable images that provide designed
functionality in most cases accessible only through their APIs.
The way for containers to accomplish this feat is through self-sufficiency and immutability.

11. Perché sono cosi forti:The toolkits: an overviewThe toolkits: an overview
Docker rkt
Containers
LXC
Sys-admins’ vision
- sandbox application processes on a shared Linux OS kernel
- simpler, lighter and denser than virtual machines
- portable across different environments
Developers’ vision
- package my application and all of its dependencies
- deploy to any environment in second and enable CI/CD
- easily access and share containerized components

12. Perché sono cosi forti:The toolkits: an overviewThe toolkits: an overview
Kubernetes
Mesosphere
Mesos
Docker Swarm
Nomad
Cluster Managers
/ Orchestrator
“it’s “simply” an operating system for distributed environments”
Focus on (here’s how both tools describe themselves):
- Kubernetes
Kubernetes is an open-source system for automating
deployment, scaling, and management of containerized
applications.
- Docker Swarm
Docker Swarm is native clustering for Docker. It turns a pool of
Docker hosts into a single, virtual host.

13. Perché sono cosi forti:The toolkits: an overviewThe toolkits: an overview
Nagios / Icinga PagerDuty
Jenkins Travis
CI/CD
Monitoring & Alerting
Drone
Bamboo
TeamCity
Graphite
Prometheus
Zabbix

14. Perché sono cosi forti:The toolkits: an overviewThe toolkits: an overview
AWS Cloud Formation
Terraform
Ansible
Puppet
ChefAutomation
Salt Stack
CF Engine

15. Perché sono cosi forti:The evolution: Infrastructure as CodeThe evolution: Infrastructure as Code
Step 0 - setup-webserver.sh
----------------------------------------
# Update the apt-get cache
sudo apt-get update
# Install PHP
sudo apt-get install -y php
# Install Apache
sudo apt-get install -y apache2
# Copy the code from repository
sudo git clone https://github.com/mycode/php-app.git /var/www/html/app
# Start Apache
sudo service apache2 start

16. Perché sono cosi forti:The evolution: Infrastructure as CodeThe evolution: Infrastructure as CodePerché sono cosi forti:The evolution: Infrastructure as CodeThe evolution: Infrastructure as Code
Step 1: Ansible role - setup-webserver.yml
----------------------------------------
- name: Update the apt-get cache
apt:
update_cache: yes
- name: Install PHP
apt:
name: php
- name: Install Apache
apt:
name: apache2
- name: Copy the code from repository
git: repo=https://github.com/mycode/php-app.git dest=/var/www/html/app
- name: Start Apache
service: name=apache2 state=started enabled=yes

17. Perché sono cosi forti:The evolution: Infrastructure as CodeThe evolution: Infrastructure as Code
Server Templating Tools
template
A server templating tool like Packer can be used to create a self-contained image of a
server. You can then use other tools, such as Ansible, to install that image across all
of your servers.

18. Perché sono cosi forti:The evolution: Infrastructure as CodeThe evolution: Infrastructure as CodePerché sono cosi forti:The evolution: Infrastructure as CodeThe evolution: Infrastructure as Code
Server Provisioning Tools
template
Server provisioning tools can be used with your cloud provider to create servers,
databases, load balancers, and all other parts of your infrastructure.
resource "aws_instance" "app" {
instance_type = "t2.micro"
availability_zone = "us-east-1a"
ami = "ami-40d28157"
user_data = <<-EOF
#!/bin/bash
sudo service apache2 start
EOF
}

19. Perché sono cosi forti:DevOps Kitchen: use case #1DevOps Kitchen: use case #1
GitHub
Jenkins
Docker
Docker container is
builded and start with
shell script on server
GitHub webhooks
trigger Jenkins
build
Jenkins copies
GitHub repo
Jenkins build the
Docker based on
Image pushed on
repo

20. Perché sono cosi forti:DevOps Kitchen: use case #2DevOps Kitchen: use case #2
Kubernetes
Elasticsearch Hawkular Splunk

21. Perché sono cosi forti:Security DevOpsSecurity DevOps
A great cultural challenge.
✔ Culture challenge #1: An entrenched view of security as something that happens “later”
✔ Culture challenge #2: An “us-versus-them” mindset
✔ Culture challenge #3: The belief that security hinders innovation

22. Perché sono cosi forti:DevOps’ work: opensource principlesDevOps’ work: opensource principles
1. Meritocracy
Open source communities are level playing fields for contributors: Anyone can make changes to an open source project. If the idea
is a good one, it can be accepted and included. Melding Dev and Ops resembles the de facto open organization that has existed in
the open source world for decades.
2. Metrics
Measurements provide a critique of a project, including data about how well something is working, in order to help developers who
are considering contributing to a project.
3. Open governance
At its heart, the open source model prescribes open governance, which implies transparent decision making. Otherwise, people
who contribute have no real stake in the game, and the level playing field is eliminated.
4. Risk tolerance
"Many eyes make all bugs shallow" is a well known open source mantra. Typically, open source communities are less risk prone
due to the participation of many contributors. This provides optimal problem resolution and rapid integration of changes.
5. Continuous improvement
A project doesn't have to be successful right out of the gate, but it must experience regular contributions with frequent inspections
and adaptations.

23. Perché sono cosi forti:DevOps’ work: the leadershipDevOps’ work: the leadership
1. Developing transformational leadership skills
Ready to change and take risks to help create the culture and environment necessary for DevOps to thrive.
2. Improving your ability to learn from mistakes
When issues arise, his advice: Be willing to dig deep in figuring out what went wrong and what good things prevented slip-ups from
getting worse.
3. Tackling culture - and middle managers
Culture change, tearing down siloed organization structures, and managing technical debt top the list. Interestingly, with all the
attention on transformational leaders at the top of organizations, DevOps teams are struggling with middle managers.
4. Growing your own talent
When it comes to people, DevOps leaders should focus on growing talent from within rather than just looking elsewhere for
DevOps skills.
5. Emphasizing the need for urgency
2018 was the year of enterprise DevOps, according to Forrester, with 50 percent of organizations implementing it now and another
27 percent planning to do so in the next 12 months.
DevOps is not just the driver of digital transformation, it’s the fuel.

24. Perché sono cosi forti:Contact cardContact card
Marco Ferrigno - @marco_ferrigno | marcoferrigno@cryptolab.net
✔ Independent researcher and consultant in computer security and systems engineering from birth;
✔ Since 1999, GNU/Linux' addicted;
✔ Since 2008, GNU/Linux evangelist as NaLUG member - Naples Linux Users Group;
✔ Since 2009, Official Debian GNU/Linux Contributor (after 10 years of use and experience);
✔ March 2011, proponent (along with a team of supporters) of the Osservatorio Partenopeo sull’OpenSource;
✔ Since August 2012, member of the ICTTF – International Cyber Threat Task Force;
✔ Since August 2014, IT Infrastructure Engineer and IT Security Manager of Programma il Futuro (Project of the Ministry
of the Italian Republic for Education, University and Research and the National Inter-University Consortium for Computer
Science);
✔ Since April 2015, Sailfish OS early adopter;
✔ Since September 2015, Digital Supporter in Digital Champions Association;
✔ Since March 2016 lent to the cloud computing as AWS SysOps Administrator;
✔ Since January 2017, IaC Engineer as vocation;
... and it's not over!