MySQLWorkbench：无法连接 MySQL 服务器
MySQLWorkbench :Cannot connect MySQL server
当我尝试连接到 MySQL 服务器时，出现以下错误消息
请告诉我我的 MySQL 服务器有什么问题
dev@dev-ThinkPad-X1-Carbon-3rd:~$ ifconfig|grep "inet addr"
inet addr:127.0.0.1 Mask:255.0.0.0
inet addr:192.168.170.50 Bcast:192.168.170.255 Mask:255.255.255.0
dev@dev-ThinkPad-X1-Carbon-3rd:~$ mysql -ubeer -pbeer -h192.168.170.50
ERROR 2003 (HY000): Can't connect to MySQL server on '192.168.170.50' (111)
dev@dev-ThinkPad-X1-Carbon-3rd:~$ mysql -ubeer -pbeer -h127.0.0.1
ERROR 2003 (HY000): Can't connect to MySQL server on '127.0.0.1' (111)
dev@dev-ThinkPad-X1-Carbon-3rd:~$ mysql -ubeer -pbeer -hlocalhost
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
这是 my.cnf 文件，我应该在 my.cnf 中做一些更改以便连接到 MySQL 服务器吗？
[client]
port = 3306
socket = /var/run/mysqld/mysqld.sock
# Here is entries for some specific programs
# The following values assume you have at least 32M ram
# This was formally known as [safe_mysqld]. Both versions are currently parsed.
[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 = 127.0.0.1
#
# * Fine Tuning
#
key_buffer = 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 = BACKUP
#max_connections = 100
#table_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
#log_slow_queries = /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
[mysqldump]
quick
quote-names
max_allowed_packet = 16M
[mysql]
#no-auto-rehash # faster start of mysql but no tab completition
[isamchk]
key_buffer = 16M
#
# * IMPORTANT: Additional settings that can override those from this file!
# The files must end with '.cnf', otherwise they'll be ignored.
#
!includedir /etc/mysql/conf.d/
这是全新安装吗？如果是这样，请检查是否安装了 mysql-server 而不是 mysql-client
sudo apt install mysql-server
此外，尝试将 my.cnf 中的这一行更改为：
bind-address = 0.0.0.0
之后
sudo service mysql restart
另一种可能性：
您可能想尝试像这样找到插座：
sudo find / -type s
找到后，您可以创建指向临时文件夹的符号链接，如下所示：
sudo ln -s /path-to-socket/mysqld.sock /tmp/mysql.sock
完成这一切后，您可能需要重新安装 MySQL 服务器并重新安装。
当我尝试连接到 MySQL 服务器时，出现以下错误消息
请告诉我我的 MySQL 服务器有什么问题
dev@dev-ThinkPad-X1-Carbon-3rd:~$ ifconfig|grep "inet addr"
inet addr:127.0.0.1 Mask:255.0.0.0
inet addr:192.168.170.50 Bcast:192.168.170.255 Mask:255.255.255.0
dev@dev-ThinkPad-X1-Carbon-3rd:~$ mysql -ubeer -pbeer -h192.168.170.50
ERROR 2003 (HY000): Can't connect to MySQL server on '192.168.170.50' (111)
dev@dev-ThinkPad-X1-Carbon-3rd:~$ mysql -ubeer -pbeer -h127.0.0.1
ERROR 2003 (HY000): Can't connect to MySQL server on '127.0.0.1' (111)
dev@dev-ThinkPad-X1-Carbon-3rd:~$ mysql -ubeer -pbeer -hlocalhost
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
这是 my.cnf 文件，我应该在 my.cnf 中做一些更改以便连接到 MySQL 服务器吗？
[client]
port = 3306
socket = /var/run/mysqld/mysqld.sock
# Here is entries for some specific programs
# The following values assume you have at least 32M ram
# This was formally known as [safe_mysqld]. Both versions are currently parsed.
[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 = 127.0.0.1
#
# * Fine Tuning
#
key_buffer = 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 = BACKUP
#max_connections = 100
#table_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
#log_slow_queries = /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
[mysqldump]
quick
quote-names
max_allowed_packet = 16M
[mysql]
#no-auto-rehash # faster start of mysql but no tab completition
[isamchk]
key_buffer = 16M
#
# * IMPORTANT: Additional settings that can override those from this file!
# The files must end with '.cnf', otherwise they'll be ignored.
#
!includedir /etc/mysql/conf.d/
这是全新安装吗？如果是这样，请检查是否安装了 mysql-server 而不是 mysql-client
sudo apt install mysql-server
此外，尝试将 my.cnf 中的这一行更改为：
bind-address = 0.0.0.0
之后
sudo service mysql restart
另一种可能性：
您可能想尝试像这样找到插座：
sudo find / -type s
找到后，您可以创建指向临时文件夹的符号链接，如下所示：
sudo ln -s /path-to-socket/mysqld.sock /tmp/mysql.sock
完成这一切后，您可能需要重新安装 MySQL 服务器并重新安装。