rails6 PostgreSQL接続時に「authentication requires libpq version 10 or above」が発生した場合

作成日 2021.01.26
rails
Rails6

Rails6でエラー「authentication requires libpq version 10 or above」が発生した場合の対処法を記述してます。

1. 環境
2. エラー全文
3. 原因
4. 対処法

環境

OS CentOS Linux release 7.9.2009 (Core)
Ruby 2.7.2
Rails 6.1.1
rbenv 1.1.2-40-g62d7798
PostgreSQL 13.1

エラー全文

DB作成時に発生

bundle exec rails db:create

エラー全文

SCRAM authentication requires libpq version 10 or above
Couldn't create 'sample_development' database. Please check your configuration.
rails aborted!
ActiveRecord::ConnectionNotEstablished: SCRAM authentication requires libpq version 10 or above
/home/username/railsApp/bin/rails:5:in `<top (required)>'
/home/username/railsApp/bin/spring:10:in `require'
/home/username/railsApp/bin/spring:10:in `block in <top (required)>'
/home/username/railsApp/bin/spring:7:in `tap'
/home/username/railsApp/bin/spring:7:in `<top (required)>'

Caused by:
PG::ConnectionBad: SCRAM authentication requires libpq version 10 or above
/home/username/railsApp/bin/rails:5:in `<top (required)>'
/home/username/railsApp/bin/spring:10:in `require'
/home/username/railsApp/bin/spring:10:in `block in <top (required)>'
/home/username/railsApp/bin/spring:7:in `tap'
/home/username/railsApp/bin/spring:7:in `<top (required)>'
Tasks: TOP => db:create
(See full trace by running task with --trace)

原因

PostgreSQLの認証方式の問題

対処法

PostgreSQL側の「postgresql.conf」をmd5にしてあげる。

password_encryption = md5

「pg_hba.conf」も以下のように編集して、再起動すれば改善されました。

# TYPE  DATABASE        USER            ADDRESS                 METHOD

local   all             all                                     trust
# IPv4 local connections:
host    all             all             127.0.0.1/32            trust
# IPv6 local connections:
host    all             all             ::1/128                 trust
# Allow replication connections from localhost, by a user with the
# replication privilege.
local   replication     all                                     trust
host    replication     all             127.0.0.1/32            trust
host    replication     all             ::1/128                 trust

host all all all md5