armon

# [ANN] Consul 0.2 Release

We released Consul 0.1 exactly two weeks ago, and today we are releasing 0.2.
This is a very exciting release for a few reasons:

* Release of the Web UI. Consul now ships with an easy to use interface that
  gives access to all the key information. We have a live demo running across
  3 datacenters here: http://demo.consul.io/

* New read consistency modes. After feedback from the community, we introduced

armon

1) Create table "kvs"
2) Create table "kvs_id_idx"

3) For insert:
a) Insert into kvs (rowid, data blob)
b) Insert into kvs_id_idx (key, rowid)

4) For delete:
a) Iterate across kvs_id_idx 
b) Delete kvs where rowid matches 

armon

Prefix: fb40ef7c-9d4d-b23d-f6fc-a14777c327e7
Inserting:
	fb40ef7c-9d4d-b23d-f6fc-a14777c327e7/b1b6da9a-6edc-26ce-8b0e-685fa9806556
	fb40ef7c-9d4d-b23d-f6fc-a14777c327e7/71b7ce26-4bb6-861f-5778-471d6e640018
	fb40ef7c-9d4d-b23d-f6fc-a14777c327e7/9aba39af-8c5a-b7e4-3e8c-f3e6ff723cc2
	fb40ef7c-9d4d-b23d-f6fc-a14777c327e7/e5f4f847-2283-9ec8-69b9-6d1209f69c4a
	fb40ef7c-9d4d-b23d-f6fc-a14777c327e7/9898fd19-a66b-d945-f989-a4f5c0fefed1
	fb40ef7c-9d4d-b23d-f6fc-a14777c327e7/e807189e-b547-d123-dbdd-b5a88e8bfbd6
	fb40ef7c-9d4d-b23d-f6fc-a14777c327e7/f1b741bb-6ecf-3df0-7f96-c1f6b1b3b75c
	fb40ef7c-9d4d-b23d-f6fc-a14777c327e7/ccb34cbb-59f0-31fb-bf5b-bd44163329c7

armon

package main

import (
	"bytes"
	"fmt"
	"github.com/armon/gomdb"
	"github.com/ugorji/go/codec"
	"reflect"
	"strings"
	"sync/atomic"

armon

Consul Consistency

As Kyle brought up, Consul at the moment has a single known case of a potential inconsistency (Could be unknown cases lurking). Currently Consul works by electing a leader, who "leases" the position for LeaderLeaseTimeout interval. At each interval, it checks that a quorum of nodes still believes it to be the leader. At the same time, if a follower does not hear from the leader within randomInterva(HeartbeatTimeout, 2 * HeartbeatTimeout), it will start a new election.

armon

package main

import (
	"encoding/binary"
	"github.com/armon/gomdb"
)

func main() {
	// Create the env
	env, err := mdb.NewEnv()

armon

def unicode_hammer(s):
  if !isinstance(s, unicode):
    return s
  for enc in ("utf-8","utf-16", "utf-32", "latin-1"):
    try:
      return s.encode(enc, "replace") 
    except:
      pass
  return s

armon

#!/bin/sh
#
# This script installs and configures the Serf agent that runs on
# every node. As with the other scripts, this should probably be done with
# formal configuration management, but a shell script is simple as well.
#
# The SERF_ROLE environmental variable must be passed into this script
# in order to set the role of the machine. This should be either "lb" or
# "web".
#

armon

package main

import (
	"crypto/tls"
	"fmt"
	"github.com/inconshreveable/muxado"
	"log"
	"net"
)

armon

package main

import (
	"fmt"
	"github.com/miekg/dns"
	"net"
	"time"
)

const domain = "consul."