Configure centos container to support ssh in Docker

In the beginning of Docker, the ubuntu system image has been downloaded, and a simple system command was successfully executed after starting the container

At this time, the container is closed. Next, we will establish a communication bridge with the container-configure SSH service

Here use centos mirroring for configuration

step

(1) Download the centos base image

(2) Write an integrated configuration file to support ssh on top of the basic image

(3) Run the configuration file and create a new image that supports ssh

(4) Run the container and start the ssh service at the same time

(5) Test, connect to the container with the ssh command

operating

(1) Download the centos base image

Execute download mirror command

# docker pull centos

(2) Write configuration files

Create a new test directory and create a new configuration file under it

# vi Dockerfile

content:

FROM        centos
MAINTAINER  dys "[email protected]"
RUN         yum install -y openssh openssh-server openssh-clients
RUN         mkdir -p /var/run/sshd
RUN         ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key
RUN         ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key
RUN         /bin/echo 'root:aaaaaa'|chpasswd
RUN         useradd dys
RUN         /bin/echo 'dys:aaaaaa'|chpasswd
RUN         /bin/sed -i 's/.*session.*required.*pam_loginuid.so.*/session optional pam_loginuid.so/g'/etc/pam.d/sshd
RUN         /bin/echo -e "LANG=\"en_US.UTF-8\"">/etc/default/local
EXPOSE      22
CMD         /usr/sbin/sshd -D

(3) Run the configuration file and create a mirror

Execute in the directory where the Dockerfile file is located:

docker build -rm -t dys/centos:ssh .

When the execution is complete, use the docker images command to see the mirror dys/centos just created

(4) Run the container

Execute the command to start the container

docker run -d -p 22 dys/centos:ssh

Use the docker ps command to check whether the startup is successful

If you see the name of the image you just created, it means that the container has run successfully

0.0.0.0:1035- >22 /tcp indicates that port 22 corresponds to port 1035, we can use the ssh client to connect

(5) Connection test

Use ssh command to connect to the container

User: dys is added to the above configuration file, and password: aaaaaa

ssh [email protected] -p 1035

Enter the password aaaaaa

Enter the container's command line

The most important thing in this process is the preparation of the Dockerfile configuration file, which will be described in detail later