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docker-compose を CI で実行するとき, MySQL の起動完了まで確実に待つ

背景

この辺は全部試したが, PHP から接続しようとすると Connection Refused が多発する。TCP で接続可能になってから実際に利用可能になるまで若干のラグがあるため,もっと確実な方法を探していた。

対処法

とりあえずこれを書いておけ
sh -c 'docker-compose logs -f <MySQLコンテナ名> | { sed "/mysqld: ready for connections/ q" && kill $$ ;}' || :
YAMLのリストに書く場合はエスケープが必要なのでパイプから改行する
- |
  sh -c 'docker-compose logs -f <MySQLコンテナ名> | { sed "/mysqld: ready for connections/ q" && kill $$ ;}' || :

ログを見れば確実!ログに ready for connections と出ればアプリケーションレベルでも必ず有効な状態であることが保証される。

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