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yaml syntax hints

# using yaml alias - referencing a single value
test: &ref "foobar"
bar: *ref

# works also with bigger objects
bob: &bob
 isPerson: true

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gitlab rules examples

# .gitlab-ci.yml

image: alpine:latest

only on branches:
 rules:

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container image tags known issues

• tags are normally used to discribe versions

• working mostly like git tags

• BUT have the same issue like git tag as that it is a changeable reference, although normally one should not change such tag reference

  • in reality though we have observed it multiple times that the underlying image to a tag changed
  • assumption in some cases was, that a fixup or similar was applied backwards
  • but this broke enough deployments for us to show an issue

• a possible solution:

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kubernetes intro

what is kubernetes

• (official definition): Kubernetes is a portable, extensible, open source platform for managing containerized workloads and services, that facilitates both declarative configuration and automation.
• insimpler terms: it's a container orchestrator (which mainly manages containers)
• it support a distributed cluster architecture
  • where a cluster describes a collection of multiple nodes/server (normally 3/5/7... consensus relevant)
  • as it useses, to store the cluster state, the etcd distributed key-value store, which under the hood uses the Raft consensus algorithm
  • with that it manages containers across the cluster, so across all the nodes
• it normally is used distributed but also can run as a single node instance, mostly for development purpose

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#!/bin/bash

##### BEGIN SETTINGS #####

SYSTEM=debian
ARCH=armhf
SUITE=testing
DEVICE=image.bin
HOSTNAME=unknown

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docker-compose

• everything you learn you actually already know

  • it's absolutly the same as with just docker
  • only difference is, it's more declerative

• let's learn and compare pure docker vs docker-compose

agenda

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linux 101

Why?

• understanding the basic's of dealing with the os
• throughout your career you will e.g. seciffcily encounter cli regualary
• cli basics are automation basics

What?

• bios vs os (2m)
• gui vs cli (2m)

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automation basics - principles

why automation?

• not to put applications into production
• to support the process of putting applications into production

devops

devops is a cultural movement

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$ docker run -it --rm ubuntu:18.04

in container

    4  apt-get update && apt-get install -y gnupg gnupg1 gnupg2 apt-transport-https curl
    5  curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
    6  cat <<EOF | sudo tee /etc/apt/sources.list.d/kubernetes.list

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#### get mac adress
`cat /sys/class/net/$(ip route show default | awk '/default/ {print $5}')/address`

tested on:
- coreos