Intro to Git Devnet-1080 Cisco Live 2018

1. #CLUS

2. Ashley Roach
Principal Engineer Evangelist
DEVNET-1080
Introduction to Git

3. Agenda
© 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public#CLUS
• Introduction
• Quick overview of Git
• Workshop
• Resources
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4. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public#CLUS
WHY AREWE HERE?
It’s kindof like:
- Snapshots ofVMs
- Incremental backups of files
- Wiki versioning
When you make a mistake or want to
do some experimenting, you can do that in
a safe way
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5. Why version control?To
Protect yourself and
others

6. What does this have to do
with Networking or Data
Center?

7. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public#CLUS
NetDevOps CICD Pipeline Demonstration
Create Proposed Branch Update Configuration Test Configuration Push Proposed Changes
Build Automation StartsBuild Test NetworkDeploy Changes and
Test
Send
Notification
Automated Pipeline Credit: Hank Preston
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Git vs. GitHub
Git is an open source
distributed version control
system / technology
GitHub is a commercial
company, that runs
GitHub.com based on Git
VCS
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9. Git:TechnicalOverview

10. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public#CLUS
DISTRIBUTED VERSION CONTROL
• Opens up to new workflows: git flow
• Each system has an exact replica of the repo as other collaborators.
https://git-scm.com/images/about/workflow-b@2x.png
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Under the hood
• Changes are stored in trees
• Trees contain changed files
• Commits contain trees
http://git-scm.com/figures/18333fig0903-tn.png
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Getting Started with Git Starting from GitHub (screenshot flow of new project)
Starting from your workstation (git init)
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Getting Started with CLI: GIT CONFIG
• So you can be held accountable, configure git
$ git config --global user.name "Your Name Comes Here"
$ git config --global user.email you@yourdomain.example.com
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Getting Started: Cloning Projects
• No password
• Set up SSH key on remote server (e.g. ssh-keygen)
$ git clone git@github.com:aroach/upgraded-guacamole.git
$ git clone https://github.com/aroach/upgraded-guacamole.git
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Getting Started: Local Repository
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What’s inside .git?
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GIT ADD
• Add any files in your repository to git “stage”
$ git add .
https://git-scm.com/images/about/index1@2x.png
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STAGING AREA
Hat tip: @GeorgiaReh
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GIT COMMIT
• Store your changes into a commit
• Saves all of your changes together / save point
• Commit does NOT push
$ git commit –m ’Initial commit’
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Git Log: History of commits
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BRANCHING:Your safe place
• Makes a pointer to your
code
• Moves HEAD around
http://git-scm.com/figures/18333fig0307-tn.png
$ git branch <name>
$ git branch testing
$ git commit –m “new”
$ git checkout master
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23. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public#CLUS
MERGING
• git merge <topic>
• You must be on the branch you want to merge INTO when you execute this
command (e.g. master)
$ git merge <branch>
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24. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public#CLUS
GOING BACKWARDS
• Generate a new commit that undoes all of the changes introduced in
<commit>, then apply it to the current branch.
$ git revert <commit>
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SHAREYOUR CHANGES
• git push <destination> <branch>
• git push origin master
$ git remote add <name> <url>
$ git push <name> <branch>
$ git push origin master
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26. © 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public#CLUS
GIT CLIENTS
• CLI Client
• IDE Clients
• VIM: airblade/vim-gitgutter
• Emacs: magit
• GUI Clients
• SourceTree
• Git Kracken
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Come find me after today… I’ll be waiting
Ashley Roach
• asroach@cisco.com
• @aroach
• http://github.com/aroach
• http://linkedin.com/in/ashleyroach
Cisco DEVNET
• @CiscoDevNet
• http://github.com/CiscoDevNet
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by the speaker until June 18, 2018.
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