Now whenever you run ssh, SSH will use the rsa_us-west-2key. Here is an example of what can be in ~/.ssh/config: Host With the default being equivalent to ssh -F ~/.ssh/configĪnd hence you can keep your config files anywhere you would like and use them using the above option and save you a bunch of time. While ~/.ssh/configis the default config file that ssh will load, you can specify an arbitrary config file using the -Foption to ssh: ssh -F The config file consists of a bunch of what is called a Hostsections which apply a bunch of options to a given set of hosts. You can create one by running touch ~/.ssh/config The default location of your SSH config file is ~/.ssh/configand it probably won’t exist if you have never used it. This is in no way complete and I would direct you to elsewhere in the internet if you are interested in other capabilities and options available. You can define all of the above in the config file and just use a short hand name and let SSH apply the configs from the file and get the same result.įor those who have never seen or dealt with an SSH config file, here is a quick introduction with the basic concepts and all you need to understand this blog. SSH has a config file to deal with this situation. o Prox圜ommand='ssh nc %h imagine you have to type that command in multiple times everyday…. All the servers in this environment use the rsa_us-west-2private keyĪll this on the command line would look like ssh -i ~/.ssh/rsa_us-west-2 \.For the dev environment in us-west-2region (an AWS region for example), we have.All the servers have FQDNs of the form.Lets start with an example with the following setting: Hence to actually connect to the hosts of interest through the bastion, I need to use a feature of SSH called Prox圜ommandor more recently ProxyForwardwhich allows SSH to use the bastion as a proxy host and connect to the server of interest, while looking like a regular SSH connection to the user. And in the cloud, these environments might be spread across cloud-regions for various reasons.Īpart from my desk workstation and my home server, for security reasons, the hosts I need to connect to are walled off behind a bastion host(s), with generally a different set of bastions per environment and or project. Most of these servers are running in-progress development environments with new features being tested out. A project may have some presence in the cloud and some presence in the data centers that the company operates. To give some context, I work on a few different projects. If it did, this blog would end right here. Most of the time just doing a ssh cut it. Daily, I end up having to SSH between VMs in the cloud, my desk workstation in the office, my home server, and things I cannot remember right now.
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