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other:ssh [2023/03/15 10:47] jypeter [Configuration files] Improved |
other:ssh [2023/03/15 14:38] jypeter [Configuration files] |
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''ssh'' will store all its **configuration files** in a ''.ssh'' sub-directory of your //home// directory. The configuration files are in a //text// format. | ''ssh'' will store all its **configuration files** in a ''.ssh'' sub-directory of your //home// directory. The configuration files are in a //text// format. | ||
- | * Linux: ''~/.ssh/'' directory | + | * **Linux**: ''~/.ssh/'' directory |
- | * Windows: ''C:\Users\your_windows_login\.ssh'' directory | + | * **Windows**: ''C:\Users\your_windows_login\.ssh'' directory |
- | * Mac: ''/Users/your_mac_login/.ssh'' directory (should be the same path as ''~/.ssh/'') | + | * **Mac**: ''/Users/your_mac_login/.ssh'' directory (should be the same path as ''~/.ssh/'') |
You will find (some of) the following text files: | You will find (some of) the following text files: | ||
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=== Some common sense advice === | === Some common sense advice === | ||
- | |||
* **Generate only one pair of private/public keys and use the same pair of keys everywhere!**\\ Put differently, do not generate a different pair of key on each computer/server you use (even if you always use the same passphrase)! | * **Generate only one pair of private/public keys and use the same pair of keys everywhere!**\\ Put differently, do not generate a different pair of key on each computer/server you use (even if you always use the same passphrase)! | ||
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* Easy to remember passphrase example: "//I love working at LSCE!//" | * Easy to remember passphrase example: "//I love working at LSCE!//" | ||
- | === Generating keys in a terminal === | + | === Generating keys in a terminal (Linux and Mac) === |
- | Remember that if you already have a pair of keys, you probably don't want to generate a new pair, unless you have been asked to (e.g. because an old encryption type like //DSA// has been deprecated), or have lost one of the keys, or forgotten your passphrase. If you generate a new pair of keys, you will have to replace the old keys that you were using on all your desktops/laptops, and all the remote servers | + | If you already have a pair of ssh keys, you probably don't want to generate a new pair, unless you have been asked to (e.g. because an old encryption type like //DSA// has been deprecated), or you have lost one of the keys, or forgotten your passphrase. If you generate a new pair of keys, you will have to replace the old keys that you were using on all your desktops/laptops, and all the remote servers |
There are several ways to generate pairs of ssh keys with ''ssh-keygen''. The following one is the one recommended for opening an account on [[https://mesocentre.ipsl.fr/account-opening/|IPSL Mésocentre ESPRI]]. If you open an account on ''spirit'', but already have a public key, just **send your existing public key**! | There are several ways to generate pairs of ssh keys with ''ssh-keygen''. The following one is the one recommended for opening an account on [[https://mesocentre.ipsl.fr/account-opening/|IPSL Mésocentre ESPRI]]. If you open an account on ''spirit'', but already have a public key, just **send your existing public key**! | ||
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* Accept the default path and key name | * Accept the default path and key name | ||
* <wrap em>Do not specify an empty passphrase!</wrap> | * <wrap em>Do not specify an empty passphrase!</wrap> | ||
- | * This will generate two text //key// files in a sub-directory of your account (''~/.ssh/'' on Linux, ''C:\Users\my_login\.ssh\'' on Windows 10): | + | * Note: ''ssh-keygen -t ed25519'' will also work on Windows! But then you will still have to [[other:putty_conf#converting_existing_ssh_keys_with_puttygen|convert the generated private key with PuTTYgen]] |
+ | * This will generate two text //key// files in the [[other:ssh#configuration_files|ssh configuration directory]]: | ||
* The **//private// key**: ''id_ed25519'' | * The **//private// key**: ''id_ed25519'' | ||
* Note: on a Linux computer, the private key has to be readable only by you, otherwise ''ssh'' will not work | * Note: on a Linux computer, the private key has to be readable only by you, otherwise ''ssh'' will not work | ||
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-----END OPENSSH PRIVATE KEY-----</code> | -----END OPENSSH PRIVATE KEY-----</code> | ||
* The **//public// key**: ''id_ed25519**.pub**'' | * The **//public// key**: ''id_ed25519**.pub**'' | ||
- | * This is the information that you can share. Note that the ''my_login@my_machine'' at the end of the line is just some information about who generated the keys, and where, and can be removed or replaced by something more informative | + | * This is the //key// that **you can share**, or that you have to send when opening an account on [[https://mesocentre.ipsl.fr/account-opening/|IPSL Mésocentre ESPRI]]. |
+ | * Note that the ''my_login@my_machine'' string at the end of the line is just some information about who generated the keys, and where, and can be removed or replaced by something more informative | ||
* <code> > cat id_ed25519.pub | * <code> > cat id_ed25519.pub | ||
ssh-ed25519 AAAAC3NzaC1lZDI1NT [ lots of cryptic characters ] Frx8rRFKthpmqRdkXl my_login@my_machine</code> | ssh-ed25519 AAAAC3NzaC1lZDI1NT [ lots of cryptic characters ] Frx8rRFKthpmqRdkXl my_login@my_machine</code> | ||
- | === Generating or importing keys with PuTTY on a Windows computer === | + | === Generating or importing keys with PuTTY (Windows) === |
- | Read the //Converting/Creating ssh keys with PuTTYgen// sub-sections of [[other:putty_conf#using_ssh_keys|Using ssh keys]], on the ''PuTTY'' page | + | Read [[other:putty_conf#converting_existing_ssh_keys_with_puttygen|Converting existing ssh keys with PuTTYgen]] or [[other:putty_conf#creating_ssh_keys_with_puttygen|Creating ssh keys with PuTTYgen]] |
==== Installing ssh keys ==== | ==== Installing ssh keys ==== |