In my work I'm often in situation where I want to restart remote server, and then immediately connect to it over ssh.
This can be done by repeating ssh HOST in shell, but it gets tedious.
I can also write a simple loop, like:
while true do ssh HOST true &> /dev/null && break echo -n . sleep 1 done echo ssh HOST
But it always hides errors, and is not really elegant.
So, I wrote a simple tool that wraps this, and some additional logic: ressh.
It's usage is very simple:
=$ ressh -t 1 -i 12 10.2.3.4 2021-01-06 11:59:55 : Trying to connect to 10.2.3.4, with timeout: 1, initial: 12, sleep: 1 : .......... 2021-01-06 12:00:14 : (+10) .. 2021-01-06 12:00:19 : 12 tries passed, disabling hiding of errors. 2021-01-06 12:00:19 : #13 : Connection timed out during banner exchange 2021-01-06 12:00:21 : #14 : Connection timed out during banner exchange 2021-01-06 12:00:23 : #15 : Connection timed out during banner exchange ... 2021-01-06 12:00:34 : Successfully logged in, after 39 seconds. Last login: Wed Jan 6 11:22:28 2021 from 10.2.3.1 12:00:34 depesz@test ~ =$
There are options to configure how long to wait for each ssh try (-t), how many times to try while hiding errors (-i), and how long to sleep between tries (-s):
=$ ./ressh -h Usage: ./ressh [-t TIMEOUT] [-i INITIAL] [-s SLEEP] [-h] HOSTNAME Options: -t - how many seconds to wait to connect, default: 5 -i - after how many tries start showing errors, default: 30 -i - how many seconds to sleep between tries, default: 1 -h - show this help page Description: ./ressh will try to connect to given HOSTNAME, retrying every couple of seconds, until it will succeed.
Hope you'll find it useful.