为了确认用户在访问软件之前是否在数据库中，需要通过“远程访问”从任意IP地址(来自自己的因特网的IP地址)连接到在线MySQL数据库
我在Linux终端上运行命令行，所有用户使用以下命令从任何ip地址中选择： grantallondatabase _ name.* to root @“%”identified by ' user
已配置MySQL数据库服务器配置文件以启用正确的远程连接。
位于/etc/MySQL/MySQL.conf.d/mysqld.cn f中的“MySQL数据库服务器配置文件”为：#
# themysqldatabaseserverconfigurationfile。
#
# You can copy this to one of:
#-'/etc/MySQL/my.cn f ' tosetglobaloptions，
#-'~/.my.cn f ' to setuser-specific options。
#
# onecanuseallongoptionsthattheprogramsupports。
# runprogramwith-- helptogetalistofavailableoptionsandwith
#-- defaultstoseewhichitwouldactuallyunderstandanduse。
#
# For explanations see
# http://dev.MySQL.com/doc/MySQL/en/server-system-variables.html
# thiswillbepassedtoallmysqlclient
# ithasbeenreportedthatpasswordsshouldbeenclosedwithticks/quotes
# escpeciallyiftheycontain ' # ' chars .
# remembertoedit/etc/MySQL/debian.cnfwhenchangingthesocketlocation。
# hereisentriesforsomespecificprograms
# thefollowingvaluesassumeyouhaveatleast 32m ram
[mysqld_safe]
socket=/var/run/mysqld/mysqld.sock
nice=0
[mysqld]
#
# *基本设置
#
user=mysql
PID-file=/var/run/mysqld/mysqld.PID
socket=/var/run/mysqld/mysqld.sock
端口=3306
basedir=/usr
datadir=/var/lib/mysql
tmpdir=/tmp
LC-messages-dir=/usr/share/MySQL
skip -外部锁定
#
# instead of skip-networkingthedefaultisnowtolistenonlyon
# localhostwhichismorecompatibleandisnotlesssecure。
mrdjdd-address=0.0.0.0
#require_secure_transport=on
#
# *精细调整
#
key_buffer_size=16M
max_allowed_packet=16M
thread_stack=192K
thread_cache_size=8
# thisreplacesthestartupscriptandchecksmyisamtablesifneeded
# 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
#
# *记录和复制
#
# bothlocationgetsrotatedbythecronjob。
# beawarethatthislogtypeisaperformancekiller。
# asof 5.1 youcanenablethelogatruntime！
# general _ log _ file=/var/log/MySQL/MySQL.log
#general_log=1
#
#错误日志- shouldbeveryfewentries。
#
log _ error=/var/log/MySQL/error.log
#
# hereyoucanseequerieswithespeciallylongduration
#slow_query_log=1
# slow _ query _ log _ file=/var/log/MySQL/MySQL-slow.log
#long_query_time=2
#log-queries-not-using-indexes
#
# thefollowingcanbeusedaseasytoreplaybackuplogsorforreplication
# note : ifyouaresettingupareplicationslave，see README.Debian about
# othersettingsyoumayneedtochange。
#server-id=1
# log _ Mr djd=/var/log/MySQL/MySQL-Mr djd.log
expire_logs_days=10
max_mrdjdlog_size=100M
# mrdjdlog _ do _ db=include _ database _ name
# mrdjdlog _ ignore _ db=include _ database _ name
#
# * InnoDB
#
# innodbisenabledbydefaultwitha 10 mbdatafilein/var/lib/MySQL /。
# readthemanualformoreinnodbrelatedoptions.there are many！
#
# *安全功能
#
# Read the manual，too，if you want chroot！
# chroot=/var/lib/mysql/
#
# forgeneratingsslcertificatesirecommendtheopensslgui ' tiny ca '。
#
# ssl-ca=/etc/mysql/cacert.pem
# SSL-cert=/etc/MySQL/server-cert.PEM
# SSL-key=/etc/MySQL/server-key.PEM
您还尝试使用以下命令行取消阻止防火墙并启用tcp连接：sudo ufw allow 3306/tcp
我的桌面APP应用程序的连接字符串如下。 MySQL conn.connectionstring=' server=my server IP address； 端口=3306； database=MyDatabaseName； uid=根； Pwd=MyPassword； Connect Timeout=30； SslMode=none；'
我的用户还“无法连接到指定的mysql主机”。 错误消息。 任何支持都欢迎。