keep your ssh connection survive from network fluctuation or wifi switching

Inspired by https://eternalterminal.dev

It work as a relay-connection between ssh-client and ssh-server.

                                        [ssh server]
                                             |
                                            tcp
                                             |
relay-client ---- relay-connection ---- relay-server
    |
  stdio
    |
[ssh client]

the relay-client & relay-server fake a persistent connection,
quietly reconnect and never noitfy ssh-client/ssh-server.

GO111MODULE=off GOPATH=$PWD go build -o ssh-keep-c client.go
GO111MODULE=off GOPATH=$PWD go build -o ssh-keep-s server.go

then got

• ssh-keep-c //the client side, ssh proxy cmd
• ssh-keep-s //the server side, ssh relay

connect to your real ssh server :22. and listen on a tcp port (:2021 for example, wait for client connect)

Run manually

./ssh-keep-s -server 127.0.0.1:22 -listen :2021

OR Use systemd service:

#install
sudo cp -pv ssh-keep-s  /usr/local/bin/
sudo cp -pv ssh-keep.service /etc/systemd/system/
sudo systemctl daemon-reload

#start
sudo systemctl start ssh-keep.service

#auto start
sudo systemctl enable ssh-keep.service

ssh -o ProxyCommand='ssh-keep-c --server %h:2021 2>/dev/null' your_ssh_server

or put it into ssh_config

## setup a ssh-keep client
Host your_ssh_server
    ProxyCommand ssh-keep-c --server %h:2021 2>/dev/null

    # Tell ssh don't kill connection when alive msg timeout
    # (Useful when PC suspend/hibernate/offline hours)
    ServerAliveInterval 0
    TCPKeepAlive no

//then it can also work as a jump host (get the benefit of stable connection)

## other can use it as a jump host
Host other_ssh_server
    ProxyJump your_ssh_server

when lose connect with server, you can't exit by Ctrl+D
//that's bash exit key, but you lose connection with it.

use

• Enter ~ . to exit
• Enter ~ ? for help

//that's ssh key.