#format wiki
#language en
= DevOps =

 * Why SaltStack 2016 - http://ryandlane.com/blog/2014/08/04/moving-away-from-puppet-saltstack-or-ansible/
 * https://trunkbaseddevelopment.com
 * [[https://dora.dev/devops-capabilities/technical/test-automation/|dora-test-automation]]
 * [[https://dora.dev/devops-capabilities/technical/test-data-management/|dora-test-data]]
 * [[https://dora.dev/devops-capabilities/technical/monitoring-and-observability/|dora-monitoring]]
 * [[https://github.blog/2023-10-16-measuring-git-performance-with-opentelemetry/|Git-trace2-to-opentelemetry]]


== Tools ==
 1. Kubernetes (See below)
 1. [[DevOps/Kaniko|kaniko]] - container builder - gcr.io/kaniko-project/executor

== Kubernetes ==
   * Info [[https://www.youtube.com/watch?v=tA8XNVPZM2w|YouTube]]
   * Google, pod docker/container manager
   * Labels 
   * Node
   * Pods - one or more containers, share network name space, pods expose single IP for all containers.
   * Reconciliation loop -> Driver current state to expected state. 
     * Create, Delete, Monitor, Replication
   * Service -> discover dynamic - long lived. uses selector to match labels and proxy's
     * Fake IP and DNS available in single pod.
   * Network Model
     * Load balancer/proxy between every layer in the application.
       * Handles service discovery with fixed IP.
   * Kubernetes infrastructure
     * !CoreOs
     * Docker / Rocket
       * Docker generates dynamic IP.
         * Kubernetes node launches infrastructure container first on Docker, to get IP and report back.
     * [[https://coreos.com/etcd/docs/latest/getting-started-with-etcd.html|etcd]] - user [[http://thesecretlivesofdata.com/raft/|raft]] protocol, for highly available key value store.
     * flannel
     * Kubernetes controller (etcd webservice exposure, scheduler, replication controller)
     * Kubernetes node (kubelet, watch controller, and update status, talks to container e.g. docker)
     * Terraform
     * Google Compute Engine.
 
 * [[https://coreos.com/etcd/docs/latest/|etcd]]

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