PostgreSQL

Question

我在数据库 mytestdb

中创建了一个名为 employees 的简单 table

我想将此 table 导入 hdfs。

bin/sqoop import --connect 'jdbc:postgresql://127.0.0.1/mytestdb' --username user -P --table employees --target-dir /user/postgres

但是，我一直收到错误消息：

WARNING: SQLException occurred while connecting to 127.0.0.1:5432 org.postgresql.util.PSQLException: FATAL: Ident authentication failed for user "user" at org.postgresql.core.v3.ConnectionFactoryImpl.doAuthentication(ConnectionFactoryImpl.java:473)

/var/lib/pgsql/data/pg_hba.conf设置如下：

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

Answer 1

查看日志文件（对于 CentOS，可能在 /var/lib/pgsql/data/pg_log 中）以获取更多详细信息。

如果用户不存在，请创建。使用 psql，您可以 create a user 喜欢：

create role hduser with login, superuser;

或来自command line：

createuser -s -e hduser

如果没有安装identd，请安装：

yum install authd xinetd

然后编辑 /etc/xinet.d/auth 并将 disable = yes 更改为 disable = no:

service auth 
{ 
        disable = no 
        socket_type = stream 
        ....
}

并重新启动 xinetd 服务：

systemctl restart xinetd

Answer 2

我从网络上的几个不同来源的组合中找到了一个可行的解决方案。

编辑配置文件

nano /var/lib/pgsql/data/pg_hba.configuration

将前两个 ident 替换为 md5，如下所示：

# 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
# Allow replication connections from localhost, by a user with the
# replication privilege.
#local   replication     postgres                                peer
#host    replication     postgres        127.0.0.1/32            ident
#host    replication     postgres        ::1/128                 ident

保存文件。

然后，重启服务器

sudo systemctl restart postgresql

最后，grant all privileges on database testdb to hduser;

PostgreSQL - 致命：用户身份验证失败

PostgreSQL - FATAL: Ident authentication failed for user

centos

sqoop

centos7