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CoreOS Technical Overview @ pdxdevops
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Brandon Philips
February 24, 2014
Programming
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350
CoreOS Technical Overview @ pdxdevops
Slides from a talk given at PDX devops
http://pdxdevops.org/
Brandon Philips
February 24, 2014
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Transcript
CoreOS
Linux for Massive Server Deployments
@BrandonPhilips github.com/philips
secure the internet Why?
manual updates
automatic updates
automatic updates
rpm replace files restart processes edit configs
apt replace files restart processes edit configs
chef replace files restart processes edit configs
puppet replace files restart processes edit configs
kernel systemd ssh docker python java nginx mysql openssl app
distro distro distro distro distro distro dist
kernel systemd ssh docker python java nginx mysql openssl app
distro distro distro distro distro distro dist
The Linux Kernel does not break userspace.
WE DO NOT BREAK USERSPACE! Seriously. How hard is this
rule to understand? We particularly don't break user space with TOTAL CRAP. - Linus Torvalds
None
None
etcd
/etc distributed
A highly-available key value store for shared configuration and service
discovery.
A highly-available key value store for shared configuration and service
discovery.
Available 3 1 2 5 4
Available 3 1 5 4
Available 3 1 4
Unavailable 3 1
A highly-available key value store for shared configuration and service
discovery.
$ mkdir services! ! $ set services/db0 10.0.0.8! $ set
services/db1 10.0.0.10! ! $ set services/db-master db0 etcdctl
GET /services/db0 “10.0.0.8”
A highly-available key value store for shared configuration and service
discovery.
{ "password": "cleartext", "user": "root" }
A highly-available key value store for shared configuration and service
discovery.
A highly-available key value store for shared configuration and service
discovery & locking.
App etcd DB?
App etcd No DB
App etcd I will watch and wait
App etcd DB Master?
App etcd No DB Master. You’re it. DB Master appeared
App etcd Heartbeat Watch SELECT * from Awesome
App etcd Heartbeat DB Master? Watch
App etcd Heartbeat Master exists. Watch
App etcd Heartbeat Heartbeat Watch
App etcd You’re master now New DB
App etcd Watch Heartbeat DROP *
App etcd Watch Heartbeat DB Master?
App etcd master exists Heartbeat Watch
$ set services/db-master db0! ! $ set --swap-with-value "db1" \!
services/db-master db0! ! Compare failed ([db1 != db0]! etcdctl
how does the db know how to talk to etcd?
buddy etcd { host: “db1”, port: 4349 }
buddy etcd heartbeat
etcd
linux+systemd CoreOS is
mount storage setup networks run processes linux+systemd manages the single
server:
mount storage $ cat media-state.mount! [Mount]! What=/dev/disk/by-label/STATE! Where=/media/state! Options=commit=600,data=ordered! Type=ext4!
FsckPassNo=0
setup networks $ cat public.link! [Match]! MACAddress=52:54:00:12:34:56! [Link]! Alias=public! !
$ cat public.network! [Network]! DHCP=True!
run services $ cat docker.service! [Unit]! After=network.target! ! [Service]! ExecStart=/usr/bin/docker
-d -H fd://! Restart=on-failure! ! [Install]! WantedBy=multi-user.target
docker runs containers $ cat scrup.service! [Unit]! Description=Scrup Service! After=docker.service!
! [Service]! ExecStart=/usr/bin/docker run -p 3000:3000 philips/scrup systemd logs and monitors
fleet demo
more security more reliability more stability
Credits: Browser Icons: https://www.iconfinder.com/ Thanks! @coreoslinux