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From Test to Live with Rex
- 1. From Test to Live with Rex
- 2. Who am I? • Jan Gehring • Working @ inovex as System Architect • Planing, Building and Operating of Linux Infrastructures • Mostly Web- and Mailcluster • Perl since 1998
- 3. Who am I? • Jan Gehring • Working @ inovex as System Architect • Planing, Building and Operating of Linux Infrastructures • Mostly Web- and Mailcluster • Perl since 1998 • @jfried83 • http://github.com/krimdomu
- 4. Well, for me it works...
- 5. Fail early - Fail hard
- 6. Rex – What's that? • Rex is for "Remote Execution" • Automating • Server Orchestration • Confiuration Management • Deployments
- 7. Rex - History • Project starts in 2010 • Was developed for Softwaredeployments • Actively maintained and extended
- 8. Philosophy • Getting Things Done o Fast o Reliable and Reproducible • Compatibility breach = Bug
- 9. Philosophie • Getting Things Done o Fast o Reliable and Reproducible • Compatibility breach = Bug • Feature Flags
- 10. Yeah, a new project!
- 11. A new project • 2 Ways to start
- 12. Ein neues Projekt • 2 Ways to start o We just start without thinking...
- 14. A new Project • 2 Ways to start o We just start without thinking... o We ask for the requirements
- 15. A new Project • 2 Ways to start o We just start without thinking... o We ask for the requirements ● Software Architecture ● Requirements regarding Perl- or Module Versions ● OS ● Do we need to support High Availbility or Cluster Solutions ● And much more...
- 17. The Development Environment • Normaly virtual • Setup as close as possible to production • Rex/Boxes for fast VM deployments • Rex to provision and deploy the VMs and later the Hardwarefor
- 18. Basics • Make = Makefile • Rex = Rexfile • Based on tasks • SSH • Supports Key, Agent and Password authentication • Protocol independant • There is also a HTTP Transport Protocol
- 19. The Beginning
- 20. Prepare the System • Example Project o Webserver o Memcache o Database
- 29. bash# rex box
- 44. There is more... • Environments • Manage services o start o stop o Edit runlevels • Working with files / Config-Management o Templates • User Management • Filesystem Operations • Harddrive Operations • ... • http://rexify.org/api
- 45. Deployments
- 46. Deployments • With Git • With a paket manager (like dpkg, rpm) • With Symlinks
- 47. Deployments • With Git • With a paket manager (like dpkg, rpm) • With Symlinks • Rex::Apache::Deploy
- 48. App Deployments
- 49. App Deployments
- 50. App Deployments
- 51. App Deployments
- 52. App Deployments
- 53. App Deployments
- 54. App Deployments bash# rex deploy --commit=abcd1234
- 55. App Deployments
- 56. App Deployments
- 57. App Deployments
- 58. App Deployments
- 59. App Deployments
- 60. App Deployments
- 61. App Deployments
- 62. Environments
- 63. Environments bash# rex -E live deploy --commit=abcd1234
- 64. Thanks for listening! ● http://rexify.org/ ● http://modules.rexify.org/ ● http://box.rexify.org/
Hinweis der Redaktion
- This is a sentence i oft hear from developers. And it's true. On there Workstation everything works fine. But on the Servers...
- Everyone loves new projects!
- If you start a project without paying attention to the requirements it will fail. But there are a lot of people doing it this way...
- In this example i will create a project with 3 VMs. One for the Web Application One for the Caching And one for the Database
- First we create a new Rex project with the „rexify“ command.
- Then we create a file called „box.yml“ describing our infrastructure. It is also possible to create the Rex/Boxes within the Rexfile with perl code. But if we use a YAML file it is later easier to switch – for example – our development to Amazon by only changing the YAML file.
- Here you'll see it a little bit larger. The „setup“ option tells Rex witch task it should run on the newly created VM to provision it.
- This is the Rexfile. First we enable all the new features and then we set the authentication information for the VMs. Every Box you download from box.rexify.org has a default password „box“ for the root user.
- Then we load the Box module and set the YAML file.
- And create a task that will create all the VMs described in the box.yml file.
- With the function boxes „init“ we advice Rex to create the VMs
- We also create the 3 tasks to setup the VMs.
- Creating the VMs
- A community Module directory for Rex
- It is possible to download modules and its dependencies from modules.rexify.org with the rexify command
- The command will download and extract the module into the „lib“ folder.
- After the download we can use the Module in our Rexfile
- Here we set the root directory for perlbrew.
- If we want to build our own perl we need to install some build dependencies first.
- Then we can install perlbrew and a custom perl.
- There is also a MySQL module for Rex on modules.rexify.org. In this task we just create a new schema and a new user.
- Deploying applications can be done in many different ways. These are 3 ways Rex::Apache::Deploy supports
- First we create a deploy task. But if we write it that way, the deployment task will run on our local machine.
- So we first need to define some groups and add servers to the group.
- For Rex/Boxes we can use the function „list_boxes“ to get a list of all available VMs.
- After we have defined our group we can add the group to a task. So this task will now run on every server of the „www“ group.
- Then we use Rex::Apache::Deploy with a special paramter „Git“. This tells the module that we want to use Git based deployments.
- At last there is always a need to write configuration files. For example to configure the database or other things.
- There is a file() function to upload files to the remote system. It is also possible to use templates. This will generate the content for a file on the fly.
- There is one special things with templates. If the template name starts with „@“ it will look at the __DATA__ section of the Rexfile to find the template and not on the filesystem. So you can add your templates directly to the Rexfile.