DevOps Introduction
Ops' job is NOT to keep the site stable and fast Ops' job is to
enable the business(this is dev's job too)
Who am i ?
Systems Administrator @
DevOps
Infrastructure as a code Puppet
Cloud Computing
@EslamElHusseiny
Dev or Ops ?
6 days after a successful deployment, server experiences
troubles high load, resources leak
Dev or Ops ?
There is an issue with build server.Code isn't building.
Dev or Ops ?
Software is deployed to the test environment.You can't login to
application.
Dev vs. Ops
Dev says ...
Ops replies ...
It's not my server, it's your code
Role of Devs and Ops
Role of Devs and Ops
DevCreate changes
Add / modify features
OpsMaintain stability
Create / enhance services
Role of Devs and Ops
DevCreate changes
Add / modify features
OpsMaintain stability
Create / enhance services
So ?
The problem Disconnect between groups
Devs don't deploy consistent software
Ops motivated to resist changes
Devolpment process is Agile
Operations process is Static
Our Goal
We are all here to ENABLE business
change
Is required for business
Doesn't mean outage
Should be exploited and not feared
Shouldn't mean fire fighting
Rescue
DevOps To The Rescue !
What is DevOps then ?
DevOps is an approach to bridge the gap between agile software
development and operations - agileweboperations.com
Collaborative mindset of Devs and Ops
C.A.M.S
Culture
Culture
RelationshipsEngage early, engage often
Be open
Eradicate last-mile syndrome
Culture
CommunicationTalk is cheap (get out of your chair)
Involve each other in core proccesses and decisions
Ask Questions
Don't say No
Automation
Automation
What ca be automated ?Builds
Deployments
Testing
Monitoring
Self-healing
System configuration
Metrics
Metrics
Capture, learn, improve.
Assist in:Capacity planning
Trend analysis
Fault finding
Metrics
Sharing
Sharing
Share ideas
Share metrics
Ops : Give devs shell access
Devs : see what technology ca be leveraged
DevOps life cycle
Before
Talk about functional requirements
Talk about non-functional requirementsSecurity
Backups
Availability
Upgradeability
Configuration management
Monitoring / Metrics
Logging
During
Communication
Source control
Automate builds
Automate tests
Automate deployments (Dev, Test, and Prod)
Collate App and System metrics
After
Release Continue to run tests
Monitor application and system
Issues (might happen)Post meetings
What are we doing ?
Puppet
Puppet
Configuration management tool
Open Source
Infrastructure as a code
Puppet
Puppet
node default {include sshinclude sudoinclude ntp}
node product.dev inherits default {include nginxinclude
tomcat5}
node product.test inherits default{include nginxinclude
tomcat6}
class sudo {package {'sudo':ensure => latest,}
file {'/etc/sudoers':owner => root,group => root,mode
=> '0440',source => 'puppet:///files/sudo/sudoers',require
=> Package['sudo'],}}
Puppet
Let's get hands on
It's deploymnt time
Monitoring
Monitoring
Problem ?
No one noticed
No one got alerted
No automatic recovery
Probelm ?
what is your application doing right now?
do you know when it fails?
failure means customers lose trust
failure means customers go elsewhere
failure means you lose money
application = providing value
Solution
Monitoring
Metrics
Logging
Monitoring means
Is the application available?
Examples
Monitoring
is this service currently providing value?is this service
consuming too many resources?
Examples
Monit
check process unicorn with pidfile /var/run/unicorn/unicorn.pid
start program = "/etc/init.d/unicorn start" stop program =
"/etc/init.d/unicorn stop" if mem is greater than 300.0 MB for 1
cycles then restart if cpu is greater than 50% for 2 cycles then
alert if cpu is greater than 80% for 3 cycles then restart group
unicorn
Metrics
measurements
historical data
graphs
Metrics
how many customers are on my site?how many customers were on my
site yesterday?
Metrics
how slow is paypal's api?how slow was paypal's api
yesterday?
Metrics
how much memory is available on my servers?how much has memory
usage grown over four weeks?
Metrics
number of open database connectionsnumber of redis
commandsnumber of 500 errorsrate of HTTP requestsnumber of HTTP
connections
Metrics
median response timenumber of failed resque jobsnumber of
twitter followers99th percentile github api response time95th
percentile mysql query time
Examples
Munin
Graphite
Metrics as a service
Logging
Logstash
log inputsprocessoutputs
Graylog2
Graylog2
Summary
own your monitoringown your metricsown your loggingnone of them
is optional
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