Two ways to exit bash in docker container under Linux

If you want to exit bash, there are two options:

The first one:

Ctrl + d to exit and stop the container;

Second type:

Ctrl + p + q to exit and run the container in the background;

Additional knowledge: Docker starts multiple services at the same time

In the previous Docker articles, only one background service was started when starting a container. Today, let’s talk about how to start multiple services through supervisor.

1. First create a directory and create a Dockerfile in the directory. The content of the file is as follows

FROM centos:centos6MAINTAINER Fanbin Kong "[email protected]"RUN rpm -ivh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpmRUN yum install -y openssh-server sudo mysql-server mysql supervisorRUN sed -i 's/UsePAM yes/UsePAM no/g' /etc/ssh/sshd_config RUN useradd adminRUN echo "admin:admin" | chpasswdRUN echo "admin ALL=(ALL) ALL" >> /etc/sudoers RUN ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_keyRUN ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_keyRUN mkdir /var/run/sshdRUN /etc/init.d/mysqld start &&\ mysql -e "grant all privileges on *.* to 'root'@'%' identified by 'letmein';"&&\ mysql -e "grant all privileges on *.* to 'root'@'localhost' identified by 'letmein';"&&\ mysql -u root -pletmein -e "show databases;"RUN mkdir -p /var/log/supervisorCOPY supervisord.conf /etc/supervisord.confEXPOSE 22 3306CMD ["/usr/bin/supervisord"]

2. Create the supervisord.conf file in the directory where the Dockerfile is located. The content is as follows:

[supervisord]nodaemon=true[program:sshd]command=/usr/sbin/sshd -D[program:mysqld]command=/usr/bin/mysqld_safe

3. Run the build command in the directory where Dockerfile is located to generate the image file. Here, mysql_server is used as the image file name.

sudo docker build -t myserver .

4. Start the container

4.1 First use the following command to start the container

sudo docker run --name=myserver -d -P myserver

4.2 After starting the container, you can use "sudo docker ps" to view it. At this time, you can see that the PORTS column content is

“0.0.0.0:49171->22/tcp, 0.0.0.0:49172->3306/tcp”

The container's ports 22 and 3306 will be mapped to the host machine's ports 49171 and 49172.

4.3 Now you can access the ssh and mysql services through the following commands

ssh admin@<host machine> -p <host machine port>mysql -h <host machine> -u root -pletmein -P 49172

4.4 Of course, you can also use "sudo docker inspect myserver | grep IPAddress" to view the container IP address, and then access the ssh and mysql services through the following commands

ssh admin@<container machine IP> mysql -h <container machine IP> -u root -pletmein

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