How to establish an SSH connection to an LXC container?

To establish an SSH connection to an LXC container, you need to do the following:

1. Install an SSH server in the LXC container. This can be done by starting the container and running the command to install the SSH server. Depending on the Linux distribution you’re using in the container, the command will be different. Here are a few examples:

- For Ubuntu/Debian

```
sudo apt-get update
sudo apt-get install openssh-server
```

- For CentOS/RHEL

```
yum install openssh-server
```

- For Fedora

```
dnf install openssh-server
```

1. You will also need to set a password for the root account (or any other account you plan to use) in the container:

```
sudo passwd root
```

1. Make sure that the SSH server is running:

- For Ubuntu/Debian

```
sudo service ssh start
```

- For CentOS/RHEL & Fedora

```
systemctl start sshd
```

1. On your host machine, run the following command to find out the IP address of your container:

```
lxc-info -n -iH
```

With being the name of your container.

1. Finally, you can SSH into your container from your host machine or any other machine:

```
ssh root@
```

If you added firewall rules or if the SSH server is running on a non-default port, you might need to adjust the above command accordingly.

Remember: SSH into a container, especially as root, may potentially expose the host machine and other containers to various attacks. Make sure to set a strong password and update your system regularly if you are planning to SSH into your containers.

Note: Containers are generally intended to run a single process or application, installing an SSH server in a container could be considered to be against the principle of building a container around a single concern. That doesn’t mean it’s never a good idea, but you should be aware of the potential concerns when doing so.