bcwaldon

package main

import (
	"fmt"
	"io"
	"net"
	"os"
	"strings"
	"sync"
)

bcwaldon

#cloud-config

coreos:
  etcd:
    addr: $private_ipv4:4001
    peer-addr: $private_ipv4:7001

  fleet:
    public-ip: $private_ipv4

bcwaldon

#cloud-config
coreos:
    units:
      - name: fleet.socket
        command: start
        drop-ins:
      - name: 30-ListenStream.conf
        content: |
          [Socket]
          ListenStream=127.0.0.1:49153

bcwaldon

$ ; start up the discovery service
$ etcd -name discovery -addr 127.0.0.1:4000 -peer-addr 127.0.0.1:7000
...

$ ; choose the discovery token
$ export UUID=$(uuidgen)
$ echo $UUID
40134540-b53c-46b3-b34f-33b4f0ae3a9c

$ ; start three nodes

bcwaldon

#cloud-config
coreos:
  etcd:
    discovery: https://discovery.etcd.io/6e1e0ce9fd5ff0fdbf74aa120b0df6a7

bcwaldon

core@core-01 ~/fleet $ etcdctl set /foo bar
bar
core@core-01 ~/fleet $ etcdctl get /foo
bar
core@core-01 ~/fleet $ etcdctl get /Foo
Error:  100: Key not found (/Foo) [10403]
core@core-01 ~/fleet $ etcdctl get /FOO
Error:  100: Key not found (/FOO) [10404]

bcwaldon

$ systemctl cat hello.service
# /etc/systemd/system/hello.service
[Service]
EnvironmentFile=/etc/environment
ExecStart=/usr/bin/etcdctl set /ez/server/test.example.com/%m "{\"host\": \"test.example.com\", \"ip\": \"${COREOS_PUBLIC_IPV4}\"}"

$ systemctl start hello.service

$ etcdctl get /ez/server/test.example.com/671a23809cf840f2b9c78f90ac2d4f55
{"host": "test.example.com", "ip": "172.17.8.101"}

bcwaldon

#cloud-config
coreos:
  units:
    - name: oneoff-thing.service
      command: start
      content: |
        [Service]
        Type=oneshot
        ExecStart=/bin/bash echo foo
        ExecStart=/bin/bash echo bar