mysql - ERROR 2013 (HY000) : Lost connection to MySQL server at 'reading initial communication packet' , 系统错误:54

Question

所以我创建了一个 5 美元的基于 ubuntu 的 droplet，并通过以下方式安装了 mysql

sudo apt-get install mysql-server

然后我运行了 sudo mysql_secure_installation 没有更改密码并按回车键回答所有其他问题。

然后按照“配置 MySQL 以允许远程访问”部分的说明进行操作。

我的 /etc/mysql/my.cnf 现在看起来像这样:

#
# 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.
[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
skip-name-resolve
#skip-networking
#
# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.
bind-address            = <MY_DROPPLET_IP>
connect_timeout = 100
# * 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
Then I might have configured something for port 3306 and ip-tables but can't remember what i tis (found on this community as well)

但是我无法从我的计算机连接到远程数据库:( 因为我得到了标题上的错误，我用谷歌搜索了它，似乎我是世界上唯一遇到系统错误的人:54

这是mysql版本:mysql Ver 14.14 Distrib 5.5.47，用于使用 readline 6.3 的 debian-linux-gnu (x86_64)

我还授予了 root 用户和其他一些用户(测试)的完全权限

这样做:

GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'r00t' WITH GRANT OPTION;

在天真的尝试中，我运行了以下命令来“打开端口 3306”:

iptables -A INPUT -p tcp -s 0/0 --sport 1024:65535 -d <serverip> --dport 3306 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -p tcp -s <serverip> --sport 3306 -d 0/0 --dport 1024:65535 -m state --state ESTABLISHED -j ACCEPT

但是我仍然从 hell 得到这个错误......:C

还尝试远程登录服务器，结果是这样的:

$ echo X | telnet -e X 45.58.41.103 3306

导致:

Telnet escape character is 'X'.
Trying <ip>...
Connected to <ip>
Escape character is 'X'.

现在我想哭:C

我只是想通过 MySQL Workbench 连接到服务器，并将数据库严格部署在远程服务器上以进行临时测试(这里安全性不是问题)。

Answer 1

原来我的防火墙在这里玩弄了我的感受。

向主机和端口添加异常修复了它。首先我尝试禁用它并且它有效，然后我详细说明并添加了异常(exception)。

希望这有时能帮助到那里的人。