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Elasticsearchコンテナを起動しても、数秒後には【Exit 78】で停止状態になる

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#はじめに
※修正などがあればコメント欄に書いていただけると嬉しいです!

症状

DockerでElasticsearchを起動しても、落ちるためNo alive nodes found in your clusterが出てElasticsearchとつなげることができなかった。

// 起動
$ docker-compose up -d elasticsearch

// 確認
$ docker ps -a
CONTAINER ID        IMAGE           COMMAND                  CREATED             STATUS              PORTS                      NAMES
xxxxxxxxx        elasticsearch   "/usr/local/bin/dock…"      5secounds        Up 5secounds         0.0.0.0:9200->9200/tcp       elasticsearch_1

// ログを確認
$ docker-compose logs elasticsearch

// エラー箇所(部分抽出)
[1]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

#原因

単に、「elasticsearchのプロセスが使用するメモリが[65530]だと少なすぎるから[262144]まで増やしなさい!」と怒っている...

[1]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

#解消法

// メモリマップ領域の増加
sudo sysctl -w vm.max_map_count=262144

これで動くはず!ぜひお試しあれ! (*´∀`)♪

#参考
このissueがかなり参考になりました。ありがとうございます!
https://github.com/laradock/laradock/issues/1699

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