Docker CentOS How to start the sshd service __docker

First, start a pure CentOS container.

Docker run-it--name=sample Centos/bin/bash

Then the SSH localhost will find the following error.

Bash:ssh:command not found

Next I'll teach you how to ssh localhost.

Yum install openssh-server
yum install openssh-clients

Try ssh localhost again and find the error change:
Ssh:connect to host localhost port 22:cannot assign requested address

Indicates that the SSHD service is not yet open. This can also be verified with PS-EF.

Because it is docker inside CentOS, so service and systemctl are not good to use.

Try to run/usr/sbin/sshd manually

reported the following error:

Could not load host key:/etc/ssh/ssh_host_rsa_key
could not load host key:/etc/ssh/ssh_host_ecdsa_key
could not Load host key:/etc/ssh/ssh_host_ed25519_key
sshd:no Hostkeys available--exiting.

Manual execution of/usr/sbin/sshd-keygen-a

Re-execution/usr/sbin/sshd successful.

To bypass this machine, perform the following command:

Ssh-keygen-t Rsa-p '-F ~/.ssh/id_rsa
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys chmod 0600 ~/.ssh/
Authorized_keys

At this point, performing an ssh localhost can be successful.