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A collection of Ruby daemons flying in close formation. AKA our startling message-based deploy environment.


Weblog-based post-hack rationalisation:

More of the same, containing example Jenkins-plumbing:


One-click (more or less. Work with me here...) deploys. Jenkins integration. Standard bus. Devops-meccano.

Pretty pictures

Some diagrams of how it works in practice for us.

Developer commits a change to the master git repo, and a post-commit-hook triggers a message to the queue:

Developer commits to git repo, message sent to queue

Jenkins receives the message and runs the appropriate tests, then sends a success or failure message to the queue:

Jenkins receives message and runs tests

The success message is received by all the servers that configuration management has told that they should have that code on them:

Successful build message received by servers

Servers git fetch the latest changes, so that they always have a local copy of the full repo, to reduce dependencies on the central git server for deploys:

Servers git fetch from master repo

Deployment works as follows:

User uses a lightweight web wrapper to select what tag they want to deploy and to what servers, MCollective client issues a message to the queue:

User requests deploy via UI, MCollective client sends message

MCollective agent receives the message, triggers the deploy process, running pre and post deploy scripts:

MCollective agent receives message, triggers deploy

Other servers deploy if this succeeds, orchestrated by MCollective:

Other servers deploy orchestrated by MCollective


MCollective agent

Remote repository updater

Shiny web front-end

Trigger repo updates from Github/Gitlab

Bonus: 'Manage' (ht)access remotely

Stomp-jenkins: Watch future.git.commits, if a project we care about has been updated, prod Jenkins via HTTP to kick off a build. (future.git.commits is one of our own topics. Yours should be different.)

Stomp-repo: Watch for package-update messages emitted by the Debian package repository. Run apt-get update if a package we're interested in has a new version. (Not quite enough blind trust to install the thing automatically. That's what puppet/mcollective is for.)

Jenkins-helper: Emit status messages on future.jenkins and to the effect that a job has started, failed or succeeded. (A better way of doing this would be a STOMP plugin for Jenkins, obviously.)

puppet-module: Git repo management and stomp-git install/setup.

Server-malarkey: Hook scripts for git. Also hook script for SVN. I'm sorry.

Stomp-keepalive: Cheap and nasty stomp heartbeat emulator to keep firewalls happy. (STOMP 1.0 doesn't do heartbeats. They're in the 1.1 spec, but implemented in a wonky sort of way on the kit we use. So. This is a quick hack to emit heartbeat packets just often enough to stop our firewalls from dropping the connection between client and broker. We have a random sort of f/w config. Consider yourself lucky if you can't see the need for this.)


A collection of Ruby daemons flying in close formation. AKA our startling message-based deploy environment.




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