【发布时间】：2020-06-17 14:18:12
【问题描述】：
我有一个应用程序要求我的用户通过“远程访问”从任何 IP 地址（他们自己的互联网网络中的 IP 地址）连接到在线 MySQL 数据库，以便在访问之前确认他们在数据库中软件。
我尝试在我的 Linux 终端中运行命令行，以允许所有用户使用以下命令从任何 IP 地址远程连接：
GRANT ALL ON database_name.* TO root@'%' IDENTIFIED BY 'user_password';
我已经配置了我的 MySQL 数据库服务器配置文件以启用正确的远程连接（我相信）。
我位于 /etc/mysql/mysql.conf.d/mysqld.cnf 的“MySQL 数据库服务器配置文件”如下所示：
#
# The MySQL database server configuration file.
#
# You can copy this to one of:
# - "/etc/mysql/my.cnf" to set global options,
# - "~/.my.cnf" to set user-specific options.
#
# One can use all long options that the program supports.
# Run program with --help to get a list of available options and with
# --print-defaults to see which it would actually understand and use.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html
# This will be passed to all mysql clients
# It has been reported that passwords should be enclosed with ticks/quotes
# escpecially if they contain "#" chars...
# Remember to edit /etc/mysql/debian.cnf when changing the socket location.
# Here is entries for some specific programs
# The following values assume you have at least 32M ram
[mysqld_safe]
socket = /var/run/mysqld/mysqld.sock
nice = 0
[mysqld]
#
# * Basic Settings
#
user = mysql
pid-file = /var/run/mysqld/mysqld.pid
socket = /var/run/mysqld/mysqld.sock
port = 3306
basedir = /usr
datadir = /var/lib/mysql
tmpdir = /tmp
lc-messages-dir = /usr/share/mysql
skip-external-locking
#
# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.
bind-address = 0.0.0.0
#require_secure_transport = on
#
# * Fine Tuning
#
key_buffer_size = 16M
max_allowed_packet = 16M
thread_stack = 192K
thread_cache_size = 8
# This replaces the startup script and checks MyISAM tables if needed
# the first time they are touched
myisam-recover-options = BACKUP
#max_connections = 100
#table_open_cache = 64
#thread_concurrency = 10
#
# * Query Cache Configuration
#
query_cache_limit = 1M
query_cache_size = 16M
#
# * Logging and Replication
#
# Both location gets rotated by the cronjob.
# Be aware that this log type is a performance killer.
# As of 5.1 you can enable the log at runtime!
#general_log_file = /var/log/mysql/mysql.log
#general_log = 1
#
# Error log - should be very few entries.
#
log_error = /var/log/mysql/error.log
#
# Here you can see queries with especially long duration
#slow_query_log = 1
#slow_query_log_file = /var/log/mysql/mysql-slow.log
#long_query_time = 2
#log-queries-not-using-indexes
#
# The following can be used as easy to replay backup logs or for replication.
# note: if you are setting up a replication slave, see README.Debian about
# other settings you may need to change.
#server-id = 1
#log_bin = /var/log/mysql/mysql-bin.log
expire_logs_days = 10
max_binlog_size = 100M
#binlog_do_db = include_database_name
#binlog_ignore_db = include_database_name
#
# * InnoDB
#
# InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.
# Read the manual for more InnoDB related options. There are many!
#
# * Security Features
#
# Read the manual, too, if you want chroot!
# chroot = /var/lib/mysql/
#
# For generating SSL certificates I recommend the OpenSSL GUI "tinyca".
#
# ssl-ca=/etc/mysql/cacert.pem
# ssl-cert=/etc/mysql/server-cert.pem
# ssl-key=/etc/mysql/server-key.pem
我还尝试使用以下命令行解锁防火墙以启用 tcp 连接：
sudo ufw allow 3306/tcp
我的桌面应用程序的连接字符串如下所示：
MysqlConn.ConnectionString = "server=MyServerIPaddress;Port=3306;database=MyDatabaseName;Uid=root;Pwd=MyPassword;Connect Timeout=30;SslMode=none;"
我的用户仍然收到“无法连接到任何指定的 mysql 主机。”错误消息。 感谢任何支持。
【问题讨论】：
-
您能否确认 TCP 端口 3306 已打开并可从公共网络访问？使用
netcat例如：nc -v [YOUR IP] 3306应该返回Connection to [YOUR IP] port 3306 [tcp/mysql] succeeded!确认端口打开后，服务器应该接收传入的连接。如果仍然无法连接，请发布 mysql 服务器日志。
标签： mysql sql-server