How to install OpenSSH server on Alpine Linux (including Docker)

To install OpenSSH, a popular open-source implementation of the SSH protocol, on Alpine Linux, including within a Docker container, follow these steps:

1. Update the package manager's package list:

apk update

2. Install OpenSSH by running the following command:

apk add openssh

This will install the OpenSSH server and client programs, as well as any dependencies required.

3. Enable the OpenSSH service to start automatically at boot time by running the following command:

rc-update add openssh default

4. Start the OpenSSH service by running the following command:

/etc/init.d/openssh start

5. To check the status of the OpenSSH service, run the following command:

/etc/init.d/openssh status

This will show you whether the service is running, and provide other information about the service.

6. To configure OpenSSH, edit the configuration files in the /etc/ssh directory. The main configuration file is sshd_config, and you can create additional configuration files in the sshd.d directory.

Once the installation is complete and the service is running, you can use OpenSSH to securely connect to and manage your Alpine Linux system, including within a Docker container.