psql: 致命錯誤: 對用戶"user1"的對等認證失敗

操作系統：Debian8

登錄pg時可能會有提示錯誤：

$ psql -U user1 -d exampledb
psql: 致命錯誤: 對用戶"user1"的對等認證失敗

打開以下文件，

$ sudo vi /etc/postgresql/9.4/main/pg_hba.conf

# TYPE DATABASE USER ADDRESS METHOD

# "local" is for Unix domain socket connections only
local all all peer
# IPv4 local connections:
host all all 127.0.0.1/32 md5
# IPv6 local connections:
host all all ::1/128 md5

將 peer 改為md5：

# TYPE DATABASE USER ADDRESS METHOD

# "local" is for Unix domain socket connections only
local all all md5
# IPv4 local connections:
host all all 127.0.0.1/32 md5
# IPv6 local connections:
host all all ::1/128 md5

然后重啟服務：

$ sudo service postgresql restart

再登錄即可：

$ psql -U user1 -d exampledb

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