Ngô Thắng IT Chia sẻ và Đào tạo kỹ năng phần mềm
And the “new trick of the week” award goes to… SSH configuration files.
I’ve been an OpenSSH user for a LONG, LONG time. I’ve used lots of different configuration, and connected to probably hundreds of hosts. No, I don’t use a GUI interface. Yes, I prefer scp to just about any other remote copying tool. I pretty much thought I knew it all.
Turns out there was an elephant-sized hole in my SSH knowledge. One of my colleagues at Palantir.net showed me his .ssh/config file.
Now, several years ago I put a few directives in one of those things, but thought nothing else of it. But a split-second glance at his configuration made me drool. He had almost a dozen hosts configured in there, allowing him to type things like this:
1 | $ ssh example |
Meanwhile, I was typing:
1 | $ ssh butcher@example.com -i my_key_file |
And my error-prone fingers rarely get the right username, hostname, and identity file.
Heading over to man’s best friend (that’d be man ssh_config), I quickly loaded up my .ssh/config file with entries that look like this:
1 2 3 4 5 6 7 8 9 10 | Host dev HostName dev.example.com Port 22000 User fooey IdentityFile ~/.ssh/devkey01 Host github HostName 210.188.199.181 User git01 IdentityFile ~/.ssh/github.key |
Now I can connect to the first one with a simple $ ssh dev, after which I will be prompted for a password. Likewise, for the second one, $ ssh github
I wish you success!
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