Concurrent ssh client
cs is a program for concurrently executing local or remote commands on multiple hosts. It is using OpenSSH for running remote commands. Its main purpose is to help automate and manage large network of hosts. So in essence this tool is very similar to Ansible, Chef or Puppet, but much more simpler and faster in execution. Speed and simplicity are its main goals.
$ go get github.com/akosela/go-cs/cs
# ln -s $GOPATH/bin/cs /usr/bin/cs
$ curl -OL https://github.com/akosela/go-cs/releases/download/v1.1/go-cs_1.1-1_amd64.deb
# dpkg -i go-cs_1.1-1_amd64.deb
Package
$ curl -OL https://github.com/akosela/go-cs/releases/download/v1.1/go-cs-1.1-1.pkg.tar.xz
# mv go-cs-1.1-1.pkg.tar.xz go-cs#1.1-1.pkg.tar.xz
# pkgadd go-cs#1.1-1.pkg.tar.xz
Port
$ httpup sync https://raw.githubusercontent.com/akosela/crux-ports/master/#go-cs go-cs
# cd go-cs
# pkgmk -i -d
$ curl -OL https://github.com/akosela/go-cs/releases/download/v1.1/go-cs-1.1.linux.tar.gz
$ tar xvf go-cs-1.1.linux.tar.gz
$ cd go-cs
$ gzip cs.1
# cp cs /usr/bin ; cp cs.1.gz /usr/share/man/man1
Package
# pkg install go-cs
Port
# cd /usr/ports/net/go-cs
# make install clean
Package
# pkg_add go-cs
Port
# cd /usr/ports/sysutils/go-cs
# make install clean
$ curl -OL https://github.com/akosela/go-cs/releases/download/v1.1/go-cs-1.1.darwin.tar.gz
$ tar xvf go-cs-1.1.darwin.tar.gz
$ cd go-cs
$ gzip cs.1
# cp cs /opt/local/bin ; cp cs.1.gz /opt/local/share/man/man1
CS(1) BSD General Commands Manual CS(1)
NAME
cs - concurrent ssh client
SYNOPSIS
cs [-emqrstuVv1] [-c file] [-cmd] [-cname] [-d file] [-dd] [-du path]
[-f script.sh] [-h hosts_file] [-hba] [-i identity_file] [-io] [-ip]
[-l login_name] [-lip] [-mx] [-nc] [-nmap] [-ns] [-o output_file]
[-P port] [-p path] [-ping] [-soa] [-to timeout] [-top] [-tr] [-tri]
[-uname] [-vm] [command] [[user@]host] ...
DESCRIPTION
cs is a program for concurrently executing local or remote commands on
multiple hosts. It is using OpenSSH for running remote commands. Its
main purpose is to help automate and manage large network of hosts.
The options are as follows:
-c file
Copy file to the remote machine.
-cmd Run an arbitrary local command concurrently on multiple hosts.
-cname Run a local DNS query of type CNAME.
-d file
Download file from the remote machine. It will be saved in a
directory named after the remote host only when you download from
multiple servers.
-dd Prints basic hardware information for a specific host (sudo(8)
and dmidecode(8) required).
-du path
Prints the list of largest files in a specific directory (sudo(8)
required, units in M).
-e Prints hosts with errors only.
-f script.sh
Run a local shell script on the remote host.
-h hosts_file
Reads hostnames from the given hosts_file. Lines in the
hosts_file can include commented lines beginning with a `#' and
only one host per line is allowed.
-hba Lists installed HBAs and their WWPNs (Linux only).
-i identity_file
Selects a file from which the identity (private key) for public
key authentication is read. The default is ~/.ssh/id_rsa.
-io Run remote iostat(1) on a specific host.
-ip Lists network interfaces.
-l login_name
Specifies the user to log in as on the remote machine. This also
may be specified on a per-host basis on the command line.
-lip Scans storage interconnects for new luns (Linux only).
-m Lists mounted filesystems on a specific host.
-mx Run a local DNS query of type MX.
-nc Tests specified port with nc(1). Default is 22/tcp.
-nmap Scans host with nmap(1).
-ns Run a local DNS query of type NS.
-o output_file
Saves standard output and standard error to a file.
-P port
Port to connect to on the remote host.
-p path
Specifies remote or local path for files in a remote copy or
download mode.
-ping Sends ICMP ECHO_REQUEST to network hosts.
-q Quiet mode. Supresses verbose standard output from remote
machines. This mode reports success or failure only.
-r Recursively copy entire directories. It follows symbolic links
encountered in the tree traversal.
-s Sort output.
-soa Run a local DNS query of type SOA.
-t Force pseudo-tty allocation.
-to timeout
Specifies the timeout (in seconds) used when connecting to the
SSH server. The default value is 4 seconds.
-top Run remote top(1) in batch mode on a specific host.
-tr Run local traceroute(8).
-tri Run local traceroute(8) using ICMP (local sudo(8) required).
-uname Prints remote system information including OS version.
-u Run remote uptime(1) on a specific host.
-V Displays the version number and exit.
-v Verbose mode. Causes cs to print debugging messages from ssh(1)
about its progress. This is helpful in debugging connection,
authentication, and configuration problems. Multiple -v options
increase the verbosity. The maximum is 3.
-vm Run remote vmstat(8) on a specific host.
-1 One line mode, useful for sorting output later.
AUTHENTICATION
The default method for authentication is a public key authentication
which serves its purpose when dealing with multiple hosts. You can read
more about public key authentication in ssh(1).
EXIT STATUS
The cs utility exits 0 on success, and >0 if an error occurs.
EXAMPLES
Run a series of commands on hosts foo and bar:
$ cs 'uptime; uname -a' foo bar
Run a command on multiple hosts specified in a hosts_file:
$ cs -h hosts_file uptime
Run a local shell script on multiple hosts:
$ cs -f script.sh foo{1..100}
Run a local shell script with sudo(8) on multiple hosts:
$ cs -t -f script.sh foo{1..100}
Copy file to multiple hosts using a specific remote path:
$ cs -c file -h hosts_file -p /foo/bar
Download file from host foo:~ to the current working directory:
$ cs -d file foo
Download recursively files from /foo/bar from multiple hosts to a speci-
fic local path /tmp with subdirectories named after remote hosts:
$ cs -r -d '/foo/bar/*' -h hosts_file -p /tmp
Run a command on multiple hosts and sort the output:
$ cs -1 -h hosts_file 'free -m | grep Swap' | sort -rnk4 | head
Run local ping(1) on multiple hosts:
$ cs -ping foo{1..100}
Show name and size of all files matching the glob pattern:
$ cs -du '/var/log/mes*' foo{1..100}
SEE ALSO
scp(1), ssh(1), ssh_config(5), sudo(8)
AUTHORS
Andy Kosela <akosela@andykosela.com>
BSD July 19, 2017 BSD