SSH

Readme

Configuration

ssh-keygen -t ed25519 -C "anton@mokr.org"

~/.ssh/config

Host example.com
  User am
  HostName example.com
  Port 22
  IdentityFile ~/.ssh/id_ed25519
  ServerAliveInterval 60
  ServerAliveCountMax 10

sudo apt install keychain

~/.bashrc

# Loading the SSH key
/usr/bin/keychain -q --nogui $HOME/.ssh/id_ed25519
source $HOME/.keychain/$HOSTNAME-sh

ssh-copy-id -i ~/.ssh/id_ed25519 am@host

ssh -T git@github.com

scp

# copy from remote machine
scp example.com:/home/am/foo.txt /home/am/

# copy to remote machine
scp /home/am/foo.txt example.com:/home/am/

 -p      Preserves modification times, access times, and modes from the original file.
 -q      Quiet mode: disables the progress meter as well as warning and diagnostic messages from ssh(1).
 -r      Recursively copy entire directories.  Note that scp follows symbolic links encountered in the tree
         traversal.

scp-tools

sudo apt-get install pv

~/.bashrc

export PATH=~/bin:$PATH

~/bin/scp-from

#!/usr/bin/env bash

set -e

arg_host=$1
from_dirname=$(dirname $2)
from_basename=$(basename  $2)
to_dirname=$3

ssh ${arg_host} exit
ssh ${arg_host} "tar -C ${from_dirname} -cf - ${from_basename}" | pv | tar -xf - -C ${to_dirname}

reverse autossh

/etc/systemd/system/examplecomtun.service

[Unit]
Description=Example.com reverse SSH
Requires=systemd-networkd-wait-online.service
After=systemd-networkd-wait-online.service

[Service]
ExecStart=/usr/bin/autossh \
        -M 2223 \
        -N \
        -q \
        -o ServerAliveInterval=10 \
        -o ServerAliveCountMax=3 \
        -o ExitOnForwardFailure=yes \
        -p 9358 \
        -i /root/.ssh/key \
        -R 2222:localhost:22 \
        user@example.com

[Install]
WantedBy=multi-user.target

systemctl daemon-reload
systemctl enable examplecomtun.service
systemctl start examplecomtun.service