如何从Docker连接到主机上的mysql?

时间:2018-11-24 20:57:48

标签: mysql docker mariadb

我在本地主机上有mysql,并且能够使用root登录:

[root@pocnnr1n1 etc]# mysql -u root -p
Enter password:
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 8
Server version: 5.5.52-MariaDB MariaDB Server

Copyright (c) 2000, 2016, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> show databases;
+--------------------+
| Database           |
+--------------------+

现在,我在此主机上有一个docker,其ip地址为'172.17.0.2'

从docker到主机ping没问题:

root@eaa90c1059f2:/app/airflow/dags# ping 192.168.211.251
PING 192.168.211.251 (192.168.211.251): 56 data bytes
64 bytes from 192.168.211.251: icmp_seq=0 ttl=64 time=0.208 ms

从docker上,如果我手动运行pymysql以创建连接:

conn= pymysql.connect(host='192.168.211.251', port=3306, user='root',
passwd='root', db='airflow')

我遇到以下错误:

  

pymysql.err.OperationalError:(1045,“拒绝用户访问   'root'@'172.17.0.2'(使用密码:是)“)

如果我将IP地址更改为“ 172.17.0.2”,如下所示:

conn= pymysql.connect(host='172.17.0.2', port=3306, user='root',
passwd='root', db='airflow')
I have the following error:
  

pymysql.err.OperationalError:(2003年,“无法连接到MySQL服务器,   '172.17.0.2'([Errno 111]连接被拒绝)“)

更新: my.cnf如下:

[mysqld]
transaction-isolation = READ-COMMITTED
# Disabling symbolic-links is recommended to prevent assorted security risks;
# to do so, uncomment this line:
# symbolic-links = 0

key_buffer = 16M
key_buffer_size = 32M
max_allowed_packet = 32M
thread_stack = 256K
thread_cache_size = 64
query_cache_limit = 8M
query_cache_size = 64M
query_cache_type = 1

max_connections = 550
#expire_logs_days = 10
#max_binlog_size = 100M

#log_bin should be on a disk with enough free space. Replace '/var/lib/mysql/mysql_binary_log' with an appropriate path for your system
#and chown the specified folder to the mysql user.
log_bin=/var/lib/mysql/mysql_binary_log
#explicit_defaults_for_timestamp = 1

binlog_format = mixed

read_buffer_size = 2M
read_rnd_buffer_size = 16M
sort_buffer_size = 8M
join_buffer_size = 8M

# InnoDB settings
innodb_file_per_table = 1
innodb_flush_log_at_trx_commit  = 2
innodb_log_buffer_size = 64M
innodb_buffer_pool_size = 4G
innodb_thread_concurrency = 8
innodb_flush_method = O_DIRECT
innodb_log_file_size = 512M

[mysqld_safe]
log-error=/var/log/mariadb/mariadb.log
pid-file=/var/run/mariadb/mariadb.pid

2 个答案:

答案 0 :(得分:1)

我刚刚进行了如下整理:

此问题与未授予用户airflow@172.17.0.2的权限有关

我需要做的是在主机的mysql上,

GRANT ALL TO 'airflow'@'172.17.0.2' IDENTIFIED BY 'airflow' ;
FLUSH PRIVILEGES;

如果您这样做,这很清楚:select User, Host, Password from mysql.user;

现在可以使用pymysql创建连接。

为方便测试,不必在气流达格中对其进行测试,只能使用python(但必须导入pymysql)进行测试

希望获得帮助。

答案 1 :(得分:0)

这是来自mysql-doc

  

确保未将服务器配置为忽略网络   连接或(如果您尝试远程连接)它具有   未配置为仅在其网络接口上本地侦听。   如果服务器以--skip-networking启动,它将不接受   完全没有TCP / IP连接。如果服务器是从以下位置启动的   --bind-address = 127.0.0.1,它将仅在环回接口上本地侦听TCP / IP连接,而不接受远程   连接。

当docker网络中的某些内容尝试连接localhost时,它还试图从远程访问mysql。

找到my.cnf(通常为/etc/mysql/my.cnf)注释行bind-address=127.0.0.1