CoreOS @ gluecon 2015
Aug 15, 2015
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About MeCTO/CO-FOUNDERsystems engineer
@brandonphilipsgithub.com/philips
What is CoreOS?
What is CoreOS?
What is CoreOS?
Why build CoreOS?
reduce API contracts
minimal
kernelsystemdetcdsshdocker
pythonjavanginxmysqlopenssl
app
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pythonjavanginxmysqlopenssl
app
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kernelsystemdetcdsshdocker
pythonopenssl-A app1
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javaopenssl-B app2
javaopenssl-B app3
kernelsystemdetcdsshdocker
CoreOS
pythonopenssl-A app1
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javaopenssl-B app2
javaopenssl-B app3
CoreOS
container
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container
container
https://github.com/philips/hacksfolder: system-api-tutorial
APIs
Linux syscalls
API
manual updates
automatic updates
automatic updates
atomic with rollback
auto updates
omaha
API
run and isolate apps
containers
http registry
image fetch
pid nsisolated pid 1
user nsisolated uid 0
network nsisolated netdev
mount nsisolated /
cgroupsmanage resources
cgroupscount resources
cgroupslimit resources
namespaces
API
cgroups
API
docker engine
REST
API
dbus
API
machines and clusters
configuration
get into the cluster
machine conf
#cloud-config
ssh_authorized_keys: - ssh-rsa AAAAB3NzaC1yc2E…
coreos: etcd: discovery: https://discovery.etcd.io/ba09c units: - name: etcd2.service command: start - name: fleet.service command: start
#cloud-config
ssh_authorized_keys: - ssh-rsa AAAAB3NzaC1yc2E…
coreos: etcd: discovery: https://discovery.etcd.io/ba09c units: - name: etcd2.service command: start - name: fleet.service command: start
#cloud-config
ssh_authorized_keys: - ssh-rsa AAAAB3NzaC1yc2E…
coreos: etcd: discovery: https://discovery.etcd.io/ba09c units: - name: etcd2.service command: start - name: fleet.service command: start
RESThypercalls
filesystems
API
what is running
cluster conf
k8s, discoverd, confd
services
what should run
cluster conf
locksmith
coordination
fleet, k8s
scheduling
etcd
API
etcd
/etcdistributed
Available
Available
Available
Unavailable
Available
Leader
Follower
Leader
Follower
Available
Leader
Follower
Temporarily Unavailable
Leader
Follower
Available
http+json
API
getting work to servers
scheduling
You
Scheduler API
Scheduler
Machine(s)
$ kubectl run-container my-nginx --image=nginx --replicas=1 --port=80
$ kubectl get podsPOD IPmy-nginx-97wt8 10.2.29.4
http+json
API
$ cat nginx.service[Service]ExecStart=/usr/bin/rkt \ docker://nginx
$ fleetctl start nginx.serviceJob nginx.service launched on e1cd2bcd.../172.17.8.101
http+json
API
while true { todo = diff(desState, curState) schedule(todo)}
while true { todo = diff(desState, curState) schedule(todo)}
while true { todo = diff(desState, curState) schedule(todo)}
while true { todo = diff(desState, curState) schedule(todo)}
the future
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