TOOL » LINUX » SSH

Config

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Simple usage ​

ssh-config
Host myhost
    HostName ec2server.ddns.net
    User ec2-user
    IdentityFile ~/.ssh/ec2-server.pem

    # Port forwarding
    LocalForward localhost:1234 targetaddress:1234
    RemoteForward localhost:1234 targetaddress:1234
    DynamicForward 1080

Host *
    ServerAliveInterval 120
    AddKeysToAgent yes

When port forwarding, localhost is the default.

The config file must have 600 permissions or it will not work.

shell
chmod 600 ~/.ssh/config

Step server ​

ssh-config
Host step-server
    HostName myhost.com
    Port 1234
    User myuser
    IdentityFile key.pem

Host destination-server
    HostName url-from-step.com
    User finaluser
    IdentityFile key.pem
    ProxyCommand ssh -X step-server -W %h:%p

Git with ssh ​

Using a key other than the default when using git with ssh.

ssh-config
## ~/.ssh/config

Host work.github.com
    HostName github.com
    User git
    IdentityFile ~/.ssh/id_rsa_work

Then on the SSH clone URL, edit github.com to work.github.com and git should use the correct key.

Proxy ​

Install connect-proxy.

For debian-based distro: apt install connect-proxy

ssh-config
Host *
    ProxyCommand connect -H username@proxyserver.com:port %h %p

Specify connect password automatically with environment variables.

shell
## /etc/environment
SOCKS5_PASSWORD=12345
SOCKS_PASSWORD=12345
HTTP_PROXY_PASSWORD=12345
CONNECT_PASSWORD=12345