[root@izbp1b5k5bjps0dw8owk7tz ~]# docker images
REPOSITORY      TAG         IMAGE ID      CREATED       SIZE
tomcat        latest       2d084b11164d    7 days ago     463MB
mysql        5.7.22       66bc0f66b7af    2 weeks ago     372MB
[root@izbp1b5k5bjps0dw8owk7tz ~]# docker ps
CONTAINER ID    IMAGE        COMMAND       CREATED       STATUS       PORTS        NAMES
[root@izbp1b5k5bjps0dw8owk7tz ~]# 

docker run --name mysql -p 3306:3306 -v /home/mysql/conf:/etc/mysql/conf.d -v /home/mysql/data:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=123456 -d mysql:5.7.221

docker run --name tomcat -p 8080:8080 -v /etc/localtime:/etc/localtime:ro -v /home/tomcat/logs:/usr/local/tomcat/logs -d --link mysql:db tomcat1

jdbc_url=jdbc:mysql://db:3306/databasename"docker-entrypoint.s…"  6 seconds ago    Up 5 seconds    0.0.0.0:3306->3306/tcp  mysql
[root@izbp1b5k5bjps0dw8owk7tz logs]# docker run --name tomcat -p 8080:8080 -v /etc/localtime:/etc/localtime:ro -v /home/tomcat/logs:/usr/local/tomcat/logs -d --link mysql:db tomcat
1458f532ef36e12ad49b4a5d90ff9b38abed00986094225354594a5fe7591362
[root@izbp1b5k5bjps0dw8owk7tz logs]# docker ps
CONTAINER ID    IMAGE        COMMAND         CREATED       STATUS       PORTS          NAMES
1458f532ef36    tomcat       "catalina.sh run"    3 seconds ago    Up 2 seconds    0.0.0.0:8080->8080/tcp  tomcat
c7378e84c19b    mysql:5.7.22    "docker-entrypoint.s…"  About a minute ago  Up About a minute  0.0.0.0:3306->3306/tcp  mysql