SSH config

~/.ssh/config

Host $SSHD_HOST
    User $USER
    IdentityFile $PRIVATE_KEY

Host *
    # Directs ssh to additionally check the host IP address in the known_hosts file.
    CheckHostIP no
    Compression yes
    # Specifies whether the connection to the authentication agent will be forwarded to the remote machine.
    ForwardAgent yes
    # Specifies if ssh should never automatically add host keys to the ~/.ssh/known_hosts file, and refuses to connect to hosts whose host key has changed.
    StrictHostKeyChecking no
    TCPKeepAlive yes
    # Specifies whether to verify the remote key using DNS and SSHFP resource records.
    VerifyHostKeyDNS no