Python和Postgresql：OperationalError：fe_sendauth：未提供密码

我知道在StackOverflow上有很多类似的问题,但是我已经阅读并重新阅读了它们,但似乎无法解决我的特定问题.

我正在开发一个使用peewee和Psycopg2访问PostGresql 数据库的Python应用程序.所有这些都在Ubuntu Vagrant虚拟机中运行.

当我尝试通过Python添加用户时,我一直收到此错误：

peewee.OperationalError：fe_sendauth：未提供密码

def add_user(user, password):
    """
    :param username:
    :param password:
    :return:
    """
    try:
        #add user to admin user table
        #Adminusermodel.create(username=user, password=password)

        # add user to psql
        conn = connect_to_db('postgres', 'postgres')
        cursor = conn.cursor()
        add_query = "CREATE ROLE %s WITH CREATEDB LOGIN PASSWORD %s"
        add_data = (AsIs(user), password)
        cursor.execute(add_query, add_data)

    except IntegrityError:
        return False

    return True

def connect_to_db(db_name, username):
    conn = psycopg2.connect(dbname=db_name, user=username)
    conn.set_isolation_level(ISOLATION_LEVEL_AUTOCOMMIT)
    return conn

我已经将pg_hba.conf文件更改为：

# Database administrative login by Unix domain socket
local   all             postgres                                trust

# "local" is for Unix domain socket connections only
local   all             all                                     md5

# IPv4 local connections:
host    all             vagrant         127.0.0.1/32            trust
host    all             all             127.0.0.1/32            md5

# IPv6 local connections:
host    all             vagrant         ::1/128                 trust
host    all             all             ::1/128                 md5

并重新启动了我的postgresql服务器.

这是我的Vagrantfile：

Vagrant.configure(2) do |config|
  config.vm.Box = "ubuntu/trusty64"

  config.vm.provider :virtualBox do |vb|
    # use for debugging the vm
    # vb.gui = true

    # speed up networking
    vb.customize ["modifyvm", :id, "--natdnshostresolver1", "on"]
    vb.customize ["modifyvm", :id, "--natdnsproxy1", "on"]
  end

  config.vm.provision "shell", inline: <<-SHELL
    sudo apt-get update
    sudo apt-get install -y python-software-properties
    sudo apt-get update -y
    # sudo apt-get upgrade -y

    sudo apt-get install -y postgresql postgresql-contrib postgresql-client libpq-dev
    sudo sed -i "s/#listen_address.*/listen_addresses '*'/" /etc/postgresql/9.3/main/postgresql.conf
    sudo cp /home/vagrant/cs419-project/vagrant_files/pg_hba.conf /etc/postgresql/9.3/main/pg_hba.conf

    sudo service postgresql restart

    # createuser -U postgres -s vagrant
    sudo -u postgres psql -c "CREATE ROLE vagrant SUPERUSER LOGIN PASSWORD 'vagrant'"
    sudo su postgres -c "createdb -E UTF8 -T template0 --locale=en_US.utf8 -O vagrant cs419"

    sudo apt-get install -y python-pip python-psycopg2
    sudo pip install peewee
  SHELL

  config.vm.synced_folder ".", "/home/vagrant/cs419-project", id: "vagrant",
    owner: "vagrant",
    group: "admin",
    mount_options: ["dmode=775,fmode=664"]
end

请您给予的任何帮助,我们将不胜感激！

注意：最奇怪的部分是这一切似乎都在起作用,然后我不知道自己做了什么更改,但是它停止了工作.

解决方法:

在pg_hba.conf文件中,对我们的fe_sendauth用户使用信任访问方法

Python和Postgresql：OperationalError：fe_sendauth：未提供密码

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