CoreOS + Kubernetes @ All Things Open

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Modern Container Orchestration Kubernetes, CoreOS, and more @coreoslinux @brandonphilips

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Brandon Philips CTO, CoreOS github.com/philips

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Easy CoreOS+Kubernetes Setup vagrant, aws, bare metal, etc coreos.com/kubernetes/docs/latest/

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Demo Instructions github.com/philips/hacks 2015-all-things-open

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What is CoreOS?

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What is CoreOS?

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What is CoreOS?

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The smartest way to run your container infrastructure. tectonic.com @tectonic

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QUAY Secure hosting for private Docker repositories quay.io @quayio

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Why build CoreOS?

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you

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you as a sw engineer

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your with Ada.Text_IO; procedure Hello_World is use Ada.Text_IO; begin Put_Line("Hello, world!"); end; #include int main() { printf("Hello, world!\n"); } package main import "fmt" func main() { fmt.Println("Hello, world!") }

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your container image

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your /bin/java /opt/app.jar /lib/libc

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your /bin/python /opt/app.py /lib/libc

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your com.example.app d474e8c57737625c

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your d474e8c57737625c Signed By: Alice

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you as an ops engineer

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your

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your com.example.webapp x3

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your com.example.webapp x3

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your ??? com.example.webapp x3

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How do we do it?

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reduce API contracts minimal

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kernel systemd rkt ssh docker python java nginx mysql openssl app tro distro distro distro distro distro

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python java nginx mysql openssl app tro distro distro distro distro distro kernel systemd rkt ssh docker

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python openssl-A app1 tro distro distro distro distro distro java openssl-B app2 java openssl-B app3 kernel systemd rkt ssh docker

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CoreOS container tro distro distro distro distro distro container container

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OS operations

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updates OS operations

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manual updates

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automatic updates

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automatic updates

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atomic update with rollback CoreOS Updates

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machine configuration OS operations

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get into the cluster machine config

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[Service] ExecStart=/usr/bin/kubelet -- api_servers=https://172.17.4.101 -- register-node=true --hostname- override=172.17.4.201 --cluster_dns=10. 3.0.10 --cluster_domain=cluster.local --tls-cert-file=worker.pem --tls- private-key-file=worker-key.pem

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distributed configuration cluster operations

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etcd

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/etc distributed

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Available Leader Follower

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Available Leader Follower

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Available Leader Follower

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Unavailable Leader Follower

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Available Leader Follower

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Available Leader Follower

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Temporarily Unavailable Leader Follower

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Available Leader Follower

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Unavailable Leader Follower

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what should run cluster operations

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k8s/mesos/etc scheduler scheduling

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getting work to servers scheduling

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$ scp app host:/opt $ ssh host systemd-run /opt/app

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$ scp app host:/opt $ ssh host systemd-run /opt/app

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$ fab deploy:app

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$ fab deploy:app

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$ fab deploy:app

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$ fab deploy:collector-app

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$ fab deploy:collector-app

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$ fab deploy:collector-app

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$ fab deploy deploy:collector-app

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$ fab lowest-loadaverage

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$ fab lowest-loadaverage host1

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$ fab lowest-loadaverage host1 $ fab -H host1 deploy:job

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You Scheduler API Scheduler Machine(s)

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while true { todo = diff(desState, curState) schedule(todo) }

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while true { todo = diff(desState, curState) schedule(todo) }

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while true { todo = diff(desState, curState) schedule(todo) }

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while true { todo = diff(desState, curState) schedule(todo) }

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$ kubectl run host-info --image=quay.io/philips/host-info --replicas=1 $ kubectl get pods POD IP host-info-97wt8 10.2.29.4

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$ kubectl scale rc host-info --replicas=2 $ kubectl get pods POD IP host-info-97wt8 10.2.29.4 host-info-f839d 10.2.29.8

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pod env=prod app=web pod env=prod app=web pod env=prod app=web rc web-prod select(env=prod,app=web) count=1

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pod env=prod app=web pod env=prod app=web pod env=prod app=web rc web-prod select(env=prod,app=web) count=1

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pod env=prod app=web rc web-prod select(env=prod,app=web) count=1

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pod env=prod app=web rc web-prod select(env=prod,app=web) count=5

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pod env=prod app=web pod env=prod app=web pod env=prod app=web pod env=prod app=web pod env=prod app=web rc web-prod select(env=prod,app=web) count=5

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where is it running cluster operations

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dns, LBs, k8s labels services

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flexible service discovery k8s labels

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pod env=dev app=web pod env=test app=web pod env=prod app=web

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pod env=dev app=web pod env=test app=web pod env=prod app=web service test.example.com select(env=dev,app=web) service beta.example.com select(env=test,app=web) OR select(env=prod,app=web) service example.com select(env=prod,app=web)

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pod env=test app=web pod env=prod app=web pod env=prod app=web pod env=dev app=web pod env=test app=web pod env=prod app=web service test.example.com select(env=dev,app=web) service beta.example.com select(env=test,app=web) OR select(env=prod,app=web) service example.com select(env=prod,app=web)

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pod app=foo,version=1 service foo.cluster.local select(app=foo)

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pod app=foo,version=1 pod app=foo,version=2 service foo.cluster.local select(app=foo)

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pod app=foo,version=1 pod app=foo,version=2 service foo.cluster.local select(app=foo)

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$ kubectl expose rc host-info --port=80 --target-port=5483 --type=NodePort $ curl http://172.17.4.202:32430/

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architecture in practice cluster operations

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worker kubelet worker kubelet worker kubelet scheduler & API worker kubelet w ku t worker kubelet

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worker kubelet worker kubelet scheduler & API

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worker & API works on 1 node too

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Easy CoreOS+Kubernetes Setup vagrant, aws, bare metal, etc coreos.com/kubernetes/docs/latest/

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coreos.com/careers work with us

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@coreoslinux @tectonicstack @brandonphilips thank you

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continuous delivery of the OS - Linux Kernel API promise - Containers are required - Consistency of configuration

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$ date -d "-674 days" Mon Jul 1 2013

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Alpha α

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Alpha Beta α β

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Alpha Beta Stable α β S

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$ cd coreos/manifest

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$ cd coreos/manifest $ git tag | wc -l

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$ cd coreos/manifest $ git tag | wc -l 329

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$ uname -r 3.8.0

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$ uname -r 3.8.0 $ uname -r 4.0.0

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$ init --version systemd 207

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$ init --version systemd 207 $ init --version systemd 219

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github.com/coreos/etcd

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...

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ok? ok?

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no yes

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done

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ok?

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github.com/coreos/etcd

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container networking

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github.com/appc/cni - Defining external plugins e.g. ipvlan, bridge, etc - Used in rkt today for setting up network namespaces - Collaborating with folks from Red Hat, Cisco, and others

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192.168.1.10 192.168.1.40

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192.168.1.10 192.168.1.40

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10.0.0.3 10.0.0.8 10.0.1.10 10.0.1.20 192.168.1.10 192.168.1.40

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192.168.1.10 192.168.1.40 10.0.0.0/24 10.0.1.0/24

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routes to 192.168.1.40 192.168.1.10 192.168.1.40 10.0.0.0/24 10.0.1.0/24

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192.168.1.40 10.0.1.0/24 192.168.1.10 routes to 192.168.1.10