1. Kubernetes

2. About me ... DevOps Architect at TV2
Bjarte Brandt
DevOps Architect at TV2
Board member: Oracle User Group Norway (OUGN)
1999
2006
2012
2017
Windows 2000, XP, Borland, Java, Oracle Database Developer, DBA, Broadcast, Sports, Elections
Windows/Linux Oracle Database, Developer, python, SQL, PLSQL
Linux, Oracle Database,Exadata, Exalogic, PLSQL, Storage, Network, OVM, Weblogic, Ansible
Linux, Elasticsearch, Docker, Jenkins, Kafka, Rabbit MQ, Ansible, SaltStack, Terraform, Kubernetes ...
Application
Oracle Database
DevOps

3. Let’s prepare for our live demo ...
Source in our AWS environment $. ./00_environment.sh (don’t forget the «.»)
Delete github repo kube-app (myblog) $./delete_repo.sh
Create kubernetes cluster in AWS $./01_create_cluster.sh

4. #. /bin/bash # create s3 bucket
#!/bin/bash # create s3 bucket. This is where the cluster configuration is stored. aws s3api create-bucket \ --bucket ${CLUSTER_FULL_NAME}-state \ --region eu-central-1 \ --create-bucket-configuration LocationConstraint=eu-central-1 # enable snapshot #aws s3api put-bucket-versioning --bucket ${CLUSTER_FULL_NAME}-state --versioning-configuration Status=Enabled # we need to reference the s3 bucket export KOPS_STATE_STORE="s3://${CLUSTER_FULL_NAME}-state" kops create cluster \ --name=${CLUSTER_FULL_NAME} \ --zones=${CLUSTER_AWS_AZ} \ --master-size="t2.medium" \ --node-size="t2.medium" \ --node-count="2" \ --dns-zone=${DOMAIN_NAME} \ --ssh-public-key="~/.ssh/id_rsa.pub" \ --kubernetes-version="1.10.1" --yes

5. Container technology. Let’s dive into the world of docker.

6. Shipping code to the server is too hard.
Why containers?
Shipping code to the server is too hard.

8. The combination of namespace and cgroup enables container technology!
Ten years ago....
Linux Kernel
Namespace: isolation, Much like FreeBSD Jails, Solaris Zones. Started in ns:mnt,pid,net,ipc,uts,user. Look into /proc/pid/ns
Cgroup (control group): resource management, resource accounting. Started in 2006 (Google). Merged into kernel in 2008 (2.6.24) Look at /proc/pid/cgroup (process), /proc/cgroup
The combination of namespace and cgroup enables container technology!

9. Wait!! We forgot CoW! Filesystem Property CoW: Copy On Write.
When container starts, image (storage,libs,apps,etc) is availabe. Just mount. This is fast!
Storage keeps track of what has changed.
AUFS,overlay (file level) look into /var/lib/docker/….
DeviceMapper (RHEL) (block level)
BTRFS, ZFS (FS level)

12. Container Deployment

13. $git push
hook

15. Kubernetes

17. Kubernetes can help us ...
Where are my containers running? I need an overview. (labels)
How much resources are my containers consuming?
We want to focus on the application side of our service, not infrastructure.
And a lot more ... (deployment,scale,operations,monitoring,health)

18. What is Kubernetes?

19. Basic Concepts – API Objects
Pods – one or more containers
Labels / Selectors – labels are queried by selectors
Replication Controllers / ReplicaSets
Deployments - bring up Pods and RelicaSets
Services - NodePort,LoadBalancer,External
StatefulSet
DaemonSet
All resources can be expressed as YAML or JSON files.

24. 1. 2. 3. 4. 5. Demo: Our blog site Create some blog content
$ hugo new site kube-app $ hugo new posts/handy-bash-one-liners.md $ hugo new posts/kubectl.md 2. 3. 4. 5.