导语：2个mysql容器在同一个net下，一个挂载了自定义配置文件的mysql端口无法被其他容器访问。

version: '3'
services:
  mysql:
    hostname: mysql
    image: 10.10.3.5/cta/mysql_base:01
    container_name: mysql
    volumes:
      - ./mysql/mysql.cnf:/etc/mysql/conf.d/mysql.cnf
      - ./mysql/mysqld.cnf:/etc/mysql/mysql.conf.d/mysqld.cnf
      - /data1/mysql-data:/var/lib/mysql
      - /data1/mysql-basedir:/srv
#      - /data1/mysqld:/var/run
    environment:
      - MYSQL_ROOT_PASSWORD=deepwise
      - TZ=Asia/Shanghai
      - LANG=C.UTF-8
      #- LANG=en_US.UTF-8
    healthcheck:
      test: [ "CMD", "mysqladmin" ,"ping", "-h", "localhost" ]
      timeout: 45s
      interval: 10s
      retries: 10
    networks:
      - work

  mysql2:
    hostname: mysql2
    image: mysql:5.7.33
    container_name: mysql2
    environment:
      - MYSQL_ROOT_PASSWORD=deepwise
      - TZ=Asia/Shanghai
      - LANG=en_US.UTF-8
    networks:
      - work
networks:
  work:
   external:
      name: cta_default

现象。不挂载配置文件mysql和mysql2 2个容器可以互相访问3306端口。

如果mysql容器使用自定义的配置，则mysql容器的3306无法被其他容器访问，但是ping 容器名是通的。

排查发现 ，因为之前mysql是在宿主机跑，没有在容器内运行。所以配置文件里的bind是127.0.0.1 ，到容器里需要调整为0.0.0.0

修改后的配置文件如下

mysqld.cnf

#
# 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
[client]
socket          = /var/lib/mysql/mysqld.sock

[mysqld_safe]
socket		= /var/lib/mysql/mysqld.sock
nice		= 0

[mysqld]
#
# * Basic Settings
#
user		= mysql
pid-file	= /var/lib/mysql/mysqld.pid
socket		= /var/lib/mysql/mysqld.sock
port		= 3306
basedir		= /srv
datadir		= /var/lib/mysql
tmpdir		= /tmp
lc-messages-dir	= /usr/share/mysql
skip-external-locking

#innodb_flush_log_at_trx_commit = 1
#sync_binlog = 1
#
# 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
#
# * 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_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/lib/mysql/mysql-bin.log
expire_logs_days	= 7
max_binlog_size     	= 500M
#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
sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION