Consulのテスト環境構築(OS X)

できること

Node    Address         Status  Type    Build  Protocol
node01  127.0.0.1:8301  alive   server  0.4.0  2
node02  127.0.0.2:8301  alive   server  0.4.0  2
node03  127.0.0.3:8301  alive   server  0.4.0  2
node04  127.0.0.4:8301  alive   client  0.4.0  2

のConsul Clusterをスクリプトで簡単に構築できる

手順

1. loopbackのエイリアスを貼る

Mac OS X – Adding a loopback alias

# 追加
$ sudo ifconfig lo0 alias 127.0.0.2
$ sudo ifconfig lo0 alias 127.0.0.3
$ sudo ifconfig lo0 alias 127.0.0.4

# 確認
$ ifconfig lo0

2. consulのインストール

http://www.consul.io/intro/getting-started/install.html

# インストール
$ brew install caskroom/cask/brew-cask
$ brew cask install consul

# 確認
$ consul -h

3. このリポジトリのファイルのダウンロード

$ git clone git@github.com:kenjiskywalker/consul-test.git
$ cd consul-test/

3. consulのweb uiのダウンロード

/consul-test/

http://www.consul.io/downloads_web_ui.html

$ curl -L -o ./web_ui.zip https://dl.bintray.com/mitchellh/consul/0.4.0_web_ui.zip
$ unzip ./web_ui.zip

4. 起動

/consul-test/

$ sh ./consul-start.sh

# 確認
$ consul members -detailed

4-1. ウェブでも確認

http://localhost:8500

4-2. 名前解決でも確認

$ dig @127.0.0.1 -p 8600 node0{1,2,3,4}.node.consul.

5. 停止

/consul-test/

$ sh ./consul-stop.sh

6. loopbackのエイリアスを削除

# 削除
$ sudo ifconfig lo0 -alias 127.0.0.2
$ sudo ifconfig lo0 -alias 127.0.0.3
$ sudo ifconfig lo0 -alias 127.0.0.4

# 確認
$ ifconfig lo0

watchesでnodes を監視する

watches で nodes を見るようにして
nodeの増減時に特定のスクリプトを実行するようにした

['-']% head node0*/_hosts
==> node01/_hosts <==
node01   127.0.0.1
node02   127.0.0.2
node03   127.0.0.3
node04   127.0.0.4

==> node02/_hosts <==
node01   127.0.0.1
node02   127.0.0.2
node03   127.0.0.3
node04   127.0.0.4

==> node03/_hosts <==
node01   127.0.0.1
node02   127.0.0.2
node03   127.0.0.3
node04   127.0.0.4

==> node04/_hosts <==
node01   127.0.0.1
node02   127.0.0.2
node03   127.0.0.3
node04   127.0.0.4
['-']%
['-']% consul leave -rpc-addr=127.0.0.4:8400
    2014/09/09 22:47:37 [INFO] agent.rpc: Accepted client: 127.0.0.4:60046
    2014/09/09 22:47:37 [INFO] agent.rpc: Graceful leave triggered
    2014/09/09 22:47:37 [INFO] consul: client starting leave
    2014/09/09 22:47:38 [INFO] serf: EventMemberLeave: node04 127.0.0.4
    2014/09/09 22:47:38 [INFO] serf: EventMemberLeave: node04 127.0.0.4
    2014/09/09 22:47:38 [INFO] agent: requesting shutdown
    2014/09/09 22:47:38 [INFO] consul: shutting down client
Graceful leave complete
    2014/09/09 22:47:38 [INFO] agent: shutdown complete
['-']%
['-']%
['-']% head node0*/_hosts
==> node01/_hosts <==
node01   127.0.0.1
node02   127.0.0.2
node03   127.0.0.3

==> node02/_hosts <==
node01   127.0.0.1
node02   127.0.0.2
node03   127.0.0.3

==> node03/_hosts <==
node01   127.0.0.1
node02   127.0.0.2
node03   127.0.0.3

==> node04/_hosts <==
node01   127.0.0.1
node02   127.0.0.2
node03   127.0.0.3
['-']%
['-']% consul leave -rpc-addr=127.0.0.3:8400
    2014/09/09 22:48:27 [INFO] agent.rpc: Accepted client: 127.0.0.3:60053
    2014/09/09 22:48:27 [INFO] agent.rpc: Graceful leave triggered
    2014/09/09 22:48:27 [INFO] consul: server starting leave
    2014/09/09 22:48:27 [INFO] serf: EventMemberLeave: node03.dc1 127.0.0.3
    2014/09/09 22:48:27 [INFO] consul: removing server node03.dc1 (Addr: 127.0.0.3:8300) (DC: dc1)
    2014/09/09 22:48:27 [INFO] serf: EventMemberLeave: node03 127.0.0.3
    2014/09/09 22:48:27 [INFO] consul: removing server node03 (Addr: 127.0.0.3:8300) (DC: dc1)
    2014/09/09 22:48:27 [INFO] raft: Removed ourself, transitioning to follower
    2014/09/09 22:48:27 [INFO] agent: requesting shutdown
    2014/09/09 22:48:27 [INFO] consul: shutting down server
Graceful leave complete
    2014/09/09 22:48:27 [ERR] http: Request /v1/catalog/nodes?index=514, error: rpc error: unexpected EOF
    2014/09/09 22:48:27 [INFO] agent: shutdown complete
['-']%
['-']%
['-']% head node0*/_hosts
==> node01/_hosts <==
node01   127.0.0.1
node02   127.0.0.2

==> node02/_hosts <==
node01   127.0.0.1
node02   127.0.0.2

==> node03/_hosts <==
node01   127.0.0.1
node02   127.0.0.2

==> node04/_hosts <==
node01   127.0.0.1
node02   127.0.0.2
node03   127.0.0.3
['-']%
['-']% ls -la  node0*/_hosts
-rw-r--r--  1 root  staff  36  9  9 22:48 node01/_hosts
-rw-r--r--  1 root  staff  36  9  9 22:48 node02/_hosts
-rw-r--r--  1 root  staff  36  9  9 22:48 node03/_hosts
-rw-r--r--  1 root  staff  54  9  9 22:47 node04/_hosts
['-']%