rexec/README.md

# rexec
Parallel SSH executor in Rust. It can read servers from `~/.ssh/known_hosts`

or even expand servers from bash expanshion line `cassandra.{prod,dev}.example.com`


[![Rust-static-build](https://github.com/house-of-vanity/rexec/actions/workflows/release.yml/badge.svg)](https://github.com/house-of-vanity/rexec/actions/workflows/release.yml)


```shell
[ab@test]$ ./rexec -k admin-gce-sc.* --help
Parallel SSH executor in Rust

Usage: rexec [OPTIONS] --expression <EXPRESSION> --command <COMMAND>

Options:
  -u, --username <USERNAME>      [default: ab]
  -k, --known-hosts              Use known_hosts to build servers list
  -e, --expression <EXPRESSION>  Expression to build server list
  -c, --command <COMMAND>        Command to execute on servers
      --code                     Show exit code ONLY
  -f, --noconfirm                Don't ask for confirmation
  -p, --parallel <PARALLEL>      [default: 100]
  -h, --help                     Print help
  -V, --version                  Print version
```

```shell
[ab@test debug]$ ./rexec -u ab -k -c uptime -e admin.* -f
[INFO ] Matched hosts:
[INFO ] admin-gce-sc-1.lca-prod.** [35.211.27.195]
[INFO ] admin-gce-sc-1.mmk-prod.** [35.211.79.202]
[ERROR] admin-gce-sc-1.led-prod.** couldn't be resolved.
[INFO ] admin-gce-sc-1.msq-dev.** [35.211.0.24]
[ERROR] admin-gce-sc-1.hui-dev.** couldn't be resolved.
    
[INFO ] Run command on 3 servers.


[INFO ] admin.gnb-prod.**
Code 0 
STDOUT:                                                    
 23:31:21 up 294 days, 14:14,  0 users,  load average: 0.53, 0.64, 0.52

STDERR:
                                                                                                                       
[INFO ] admin.abe-prod.**
Code 0 
STDOUT:                                                    
 23:31:22 up 154 days,  9:24,  0 users,  load average: 0.31, 0.25, 0.18
                                                           
STDERR:

[INFO ] admin-gce-be-1.toy-prod.**
Code 0                                                     
STDOUT:
 23:31:22 up 98 days,  6:20,  0 users,  load average: 0.88, 0.74, 0.80
                             
STDERR:
no server running on /tmp/tmux-1019/default                                                                            
open terminal failed: not a terminal
```