Gossh is a high-performance and high-concurrency ssh tool written in Go. It can efficiently manage tens of thousands of Linux server clusters. It is 10 times faster than Ansible. If you need much more performance and better ease of use, you will love gossh.

Feel free to open a new issue if you have any issues, questions or suggestions about this project.

• Four kinds of ssh tasks:
  command: Execute commands on target hosts.
  script: Execute a local shell script on target hosts.
  push: Copy local files and dirs to target hosts.
  fetch: Copy files and dirs from target hosts to local.

• Auto detect following authentication methods for the login user(default $USER):
  Password: from inventory file, or from flag -k/--auth.ask-pass,-p/--auth.password,-a/--auth.pass-file, or from configuration file.
  Pubkey Authentication: by identity files(default ~/.ssh/id_rsa), also include that with passphrase.
  SSH-Agent Authentication: through the system environment variable $SSH_AUTH_SOCK.
  If the above three authentication methods are valid at the same time, the priority order is: SSH-Agent > Pubkey > Password.

• Provide the target hosts by:
  Hosts/host-patterns/host-group-names as positional arguments separated by space.
  Inventory file by flag -i/--hosts.inventory or from configuration file.

• Expand host patterns that from positional arguments or a inventory file to host list. Supported host patterns e.g.:

  10.16.0.[1-10]
  foo[01-03].bar.com
  foo[01-03,06,12-16].idc[1-3].[beijing,wuhan].bar.com
  

• Allow adding variables to inventory file.
  Available variables: host, port, user, password, keys, passphrase. E.g.:

  alias_name_node1 host=node1.sre.im
  alias_name_node2 host=192.168.33.12 port=8022 user=vagrant password=123456 keys=~/.ssh/id_rsa passphrase=xxx
  node3.sre.im user=vagrant password=GOSSH-AES256:9cfe499133b69a6c7fc62b5b6ba72d3d8dfb4d0e7987170a40c5d50bb5d71e19
  

• Group hosts in inventory file. E.g.:

  # no group hosts
  node1.sre.im
  
  # group hosts
  [webserver]
  node2.sre.im port=6022
  node3.sre.im
  
  # host variables for group webserver
  [webserver:vars]
  port=8022
  user=zhangsan
  password=plaintextOrCiphertextByVault
  
  [dbserver]
  db[1-3].sre.im
  
  # group project1 has hosts that from both group webserver and dbserver
  [project1:children]
  webserver
  dbserver
  

• Use sudo to run as other user(default root) to execute the commands/shell-script or fetch files/dirs.

• Specify i18n environment variable value while executing commands or a shell script to help keep the language of the outputs consistent. For example: zh_CN.UTF-8, en_US.UTF-8.

• Three kinds of timeout in seconds:
  Connecting to each target host (default 10).
  Subcommand command, script, push, fetch for each target host.
  The entire gossh task.

• Output to a file or screen or a file and screen at the same time.
  Colorful output, json format output, verbose(debug) output, and silent output.

• High-performance and high-concurrency. Customize the number of concurrent connections (default 1).

• SSH Proxy can be specified to connect to the target hosts.

• Provides subcommand vault to encrypt/decrypt confidential information such as password or passphrase without compromising security.

• Support the detection of dangerous commands that will be executed on target hosts, and allow users to customize a blacklist of commands.

• For ease of use, it supports config file. You can write flags that are not frequently changed into the config file, so you don't need to laboriously specify these flags on the command line. If the flag in both command line and config file, flag that from command line takes precedence over the other.
  The default config file is $PWD/.gossh.yaml or $HOME/.gossh.yaml, and $PWD/.gossh.yaml has a higher priority. Note that the config file is optional, that is, there can be no config file.

• Provides subcommand config to help generate configuration file in easy way.

Prebuilt binaries for macOS and Linux can be downloaded from the GitHub releases page.

Also you can install gossh by compiling:

$ git clone --depth 1 https://github.com/windvalley/gossh

$ cd gossh

# Note: need to install Go environment first.
$ make && make install

$ gossh -h

Gossh is a high-performance and high-concurrency ssh tool.
It can efficiently manage tens of thousands of Linux server clusters.

Find more information at: https://github.com/windvalley/gossh

Usage:
  gossh [command]

Available Commands:
  command     Execute commands on target hosts
  script      Execute a local shell script on target hosts
  push        Copy local files and dirs to target hosts
  fetch       Copy files and dirs from target hosts to local
  vault       Encryption and decryption utility
  config      Generate gossh configuration file
  version     Show gossh version information
  help        Help about any command
  completion  Generate the autocompletion script for the specified shell

Flags:
  -u, --auth.user string                login user (default $USER)
  -p, --auth.password string            password of login user
  -k, --auth.ask-pass                   ask for the password of login user
  -a, --auth.pass-file string           file that holds the password of login user
  -I, --auth.identity-files strings     identity files (default [~/.ssh/id_rsa])
  -K, --auth.passphrase string          passphrase of the identity files
  -V, --auth.vault-pass-file string     text file or executable file that holds the vault password
                                        for encryption and decryption
  -i, --hosts.inventory string          file that holds the target hosts
  -P, --hosts.port int                  port of the target hosts (default 22)
  -l, --hosts.list                      outputs a list of target hosts, and does not do anything else
  -s, --run.sudo                        use sudo to execute commands/script or fetch files/dirs
  -U, --run.as-user string              run via sudo as this user (default "root")
  -L, --run.lang string                 specify i18n while executing command
                                        (e.g. zh_CN.UTF-8|en_US.UTF-8)
  -c, --run.concurrency int             number of concurrent connections (default 1)
  -B, --run.command-blacklist strings   commands that are prohibited from execution on target hosts
                                        (default: [rm,reboot,halt,shutdown,init,mkfs,mkfs.*,umount,dd])
  -o, --output.file string              file to which messages are output
  -j, --output.json                     output messages in json format
  -C, --output.condense                 condense output and disable color
  -q, --output.quiet                    do not output messages to screen
  -v, --output.verbose                  show debug messages
  -X, --proxy.server string             proxy server address
      --proxy.port int                  proxy server port (default 22)
      --proxy.user string               login user for proxy (default same as 'auth.user')
      --proxy.password string           password for proxy (default same as 'auth.password')
      --proxy.identity-files strings    identity files for proxy (default same as 'auth.identity-files')
      --proxy.passphrase string         passphrase of the identity files for proxy
                                        (default same as 'auth.passphrase')
  -t, --timeout.command int             timeout seconds for handling each target host
      --timeout.task int                timeout seconds for the entire gossh task
      --timeout.conn int                timeout seconds for connecting each target host (default 10)
      --config string                   config file (default {$PWD,$HOME}/.gossh.yaml)
  -h, --help                            help for gossh

Use "gossh [command] --help" for more information about a command.

Client server: 4vCPUs and 8GiB

Target servers: hosts.list contains 936 servers distributed in 86 different IDCs across the country.

Ansible:

$ time ansible all -i hosts.list -m command -a "uptime" -f 100 -k

Output:

...

real    1m18.858s
user    3m18.566s
sys     1m24.263s

Gossh:

$ time gossh command -i hosts.list -e "uptime" -c 100 -k

Output:

...

[INFO] 2021-12-22 23:06:50.837228 success count: 936, failed count: 0, elapsed: 6.30s

real    0m6.316s
user    0m13.529s
sys     0m0.592s

• Configuration
• Inventory
• Authentication
• Command
• Script
• Push
• Fetch
• Vault

CHANGELOG

I actively welcome your pull requests, please follow the steps below:

1. Open a new issue at gossh/issues.

2. Fork the repo and create your branch from main.

3. Do the changes in your fork.

4. Send a pull request.

Note: Any contributions you make will be under the MIT Software License.

This project is under the MIT License. See the LICENSE file for the full license text.