That's it! When you want to ssh to the target server, simply issue ssh targetserver and your connection will first hit the bastion host to be used as a proxy. You'd create an entry that looks like this: HostName targetserver User targetuser Host 192.168.1.2 Prox圜ommand ssh bastionhost -W %h:%p For this example, lets say a server with IP 192.168.1.2 is available from the bastion host. ssh/config entries to access other servers that are only accessible through the bastion host. With access to the bastion host itself out of the way, you're now ready to create. To use the entry you can simply issue 'ssh bastionhost' and you'll access your bastion host as user bastionuser using your default private key. It gives you a very easy way to ssh to your bastion host and it gives you a target you can use as a proxy to access other hosts. ![]() Your entry would look like this: HostName bastionhost User bastionuser Host 192.168.0.1 As an example, lets say you have a bastion host at IP 192.168.0.1 and you've installed your public key to user called 'bastionuser'. ssh/config file that describes how to access the bastion host itself. To get started, simply add an entry into your. Search the web for the best way to achieve key only authentication on your distribution of choice.Ĭonfiguring access to any server using a bastion host starts by first defining how you will connect to the bastion host itself. While convenient, it isn't necessary for you to use the same keys on all servers you access. This immediately negates any brute force based attempts to access your server. ![]() Whatever your reason, a bastion host is a great way to increase security by decreasing the number of exposed hosts on the internet.įor the best security, all hosts should be configured to allow only key based authentication. Limiting access to the other hosts would either be controlled by firewall rules or simply because they don't have public IPs. This is the first host you'd access prior to using ssh to access some other host. There are times when it is necessary or desirable to access servers through a single host, called a bastion.
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