从rstudiodocker内部连接到主机mysql数据库

我可以从运行RStudio的docker容器内部连接到主机MySQL吗?RStudio容器运行得很好,当我尝试连接到'outside'MySQL将数据写入db时,我遇到了一个问题。

正在尝试 R 只是挂在最后:

library(RMySQL)
library(DBI)
  db_user <- Sys.getenv("server_user")
  db_password <- Sys.getenv("server_pass")
  db_host <- '172.17.0.1' # docker ip
  db_dbname <- "test"

  mydb <-
    dbConnect(
      MySQL(),
      user = db_user,
      password = db_password,
      dbname = db_dbname,
      host = db_host, 
      port = 3306
    )
Error in .local(drv, ...) : 
  Failed to connect to database: Error: Can't connect to MySQL server on '172.17.0.1' (107)

为了保持容器与所有端口映射一起运行,我最终向iptables添加了一个规则并连接到数据库,就像从另一台服务器连接到它一样:

sudo iptables -I INPUT 5 -p tcp -s 172.17.0.2 --dport 3306 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT -m comment --comment "docker DB access"

我还在MySQL中创建了一个可以访问数据库的特殊docker用户:

CREATE USER 'docker'@'172.17.0.2' IDENTIFIED BY 'XXX';
GRANT SELECT, INSERT, CREATE ON *.* 'docker'@'172.17.0.2' IDENTIFIED BY 'XXX';