Launching Containers with fleet Docker Seoul Meetup #3 / Feb 14, 2014

by @subicura (김충섭)

deployment

container

image를 배포하고

container를 stop/start만 하면 되는데..

fleet

a distributed init system

fleet = systemd + etcd

fleet = systemd + etcd

System and Service Manager CoreOS default init system

Fedora, Gentoo, Arch 사용중 / RedHat, Debian, Ubuntu 곧

fleet = systemd + etcd

[Unit] Description=My Service Requires=docker.service After=docker.service

[Service] ExecStart=/usr/bin/docker run --rm --name my_service busybox \ /bin/sh -c "while true; do echo Hello World; sleep 1; done" ExecStop=/usr/bin/docker kill my_service

systemd service file sample

systemd command

시작 - systemctl start [service]

종료 - systemctl stop [service]

강제종료 - systemctl kill [service]

상태보기 - systemctl status [service]

로그보기 - journalctl -u [service]

[Unit] Description=My Service Requires=docker.service After=docker.service

[Service] ExecStart=/usr/bin/docker run --rm --name my_service busybox \ /bin/sh -c "while true; do echo Hello World; sleep 1; done" ExecStop=/usr/bin/docker kill my_service

[X-Fleet] MachineMetadata=type=app Conflicts=%p@*.service

fleet unit file sample

fleet-specific properties

MachineID - 해당하는 machine에서 실행

MachineOf - 특정 서비스가 수행중인 machine에서 실행

MachineMetadata - metadata를 가진 machine에서 실행

Conflicts - 해당 서비스가 수행중인 machine을 피해서 실행

Global - 전체 machines에서 실행

fleetctl command서버리스트 - fleetctl list-machines

유닛리스트 - fleetctl list-units

등록 - fleetctl submit [service]

시작 - fleetctl start [service]

종료 - fleetctl stop [service]

제거 - fleetctl destroy [service]

상태보기 - fleetctl status [service]

로그보기 - fleetctl journal [service]

fleet list-machines

fleet list-units

fleet start nginx-confd.service

DEMO

summary

easy (with coreos) - systemd + etcd + fleetd

Deploy docker containers on arbitrary hosts in a cluster

re-scheduling on machine failure

Automatically SSH into the machine running a job

difficult server balance - no check cpu/memory/hdd/network

Lack of option

Lack of GUI Tool