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Setting ssh keys

There are ssh keys needed for ssh connections and there is an ssh agent.

The ssh agent looks the keys into the ~/.ssh/config map. This file is only a map with the configurations and the keys. You can say, if the url is this, then use the key x or whatever.

creating ssh keys

You can have several keys if you want or only one for all. As you wish.

when you want to create a key, two files are created the public and the private files. The public contains the public key, and this file is used into the github for the configuration of the repositories.

Generating keys

# create the priv/pub keys
ssh-keygen -t rsa -b 4096 -C "your_email@gmail.com"

# by default creates the id_rsa for the private key and the id_rsa_pub for the public key
# take care, if you have a previous id_rsa you are going to override them.
> Enter a file in which to save the key (/home/you/.ssh/id_rsa): [Press enter]

# do enter two times, leave it empty
> Enter passphrase (empty for no passphrase): [Type a passphrase]
> Enter same passphrase again: [Type passphrase again]

add keys to the ~/shh/config file, adding key to the agent

The ssh-agent stores the private keys into the macosx keystore. to do that

ssh-add -K ~/.ssh/id_rsa

this process will create the ~/shh/config file with the info. If it's not, you have to create it.

Host *
        AddKeysToAgent yes
        IgnoreUnknown UseKeychain
        UseKeychain yes
        IdentityFile ~/.ssh/id_rsa

reference: - https://docs.github.com/en/authentication/connecting-to-github-with-ssh/adding-a-new-ssh-key-to-your-github-account

problem

git pull git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.
Please make sure you have the correct access rights and the repository exists.

Solution: ssh configuration

For seeing the previous ssh configurations

cat ~/.ssh/config

you can see the shh profiles 

Host *
        AddKeysToAgent yes
        IgnoreUnknown UseKeychain
        UseKeychain yes
        IdentityFile ~/.ssh/id_rsa

Host development
        User usuarioX
        Port 22223
        ProxyJump gate

Host gate
        Hostname gate.somedomain.com
        User someUser
        Port 22223
        ForwardAgent yes
        IdentityFile ~/.ssh/id_rsa

Host pre-somedomain* pre-somedomain01 pre-somedomain02
        User anotheruser
        Port 22223
        ProxyJump gate

Host somedomain.whatever.com
        Port 29418
        User someUser
        IdentityFile ~/.ssh/id_ed25519%

to get the public key of the ~/.ssh/id_rsa you have to do 

cat ~/.ssh/id_rsa_pub

go to github -> yourprofile -> settings -> SSH keys

in this page, create a new ssh key, and paste the content of id_rsa_pub

reboot the intellij and do git pullto see if everything is ok.

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