Hello everyone,
Since I'm not happy with shmux or pssh, I wrote my own concurrent ssh
program for parallel execution of SSH commands on multiple hosts. Before
I release program to the wild, I would like to hear (constructive)
comments on what may be wrong with the program and/or how to fix it.
(note: the program requires paramiko ssh client module)
#!/usr/local/bin/python -W ignore::DeprecationWarning
import time
import sys
import os
import operator
import paramiko
import threading
import subprocess
import optparse
usage = Usage: cssh [options] IP1 hostname2 IP3 hostname4
...\n\n(IPs/hostnames on the commandline are actually optional, they can
be specified in the file, see below.)
op = optparse.OptionParser(usage=usage)
op.add_option('-c','--cmd',dest='cmd',help=Command to run. Mutually
exclusive with -s.)
op.add_option('-s','--script',dest='script',help=Script file to run.
Mutually exclusive with -c. Script can have its own arguments, specify
them in doublequotes, like script -arg arg.)
op.add_option('-i','--script-dir',dest='scriptdir',help=The directory
where script will be copied and executed. Defaults to /tmp.)
op.add_option('-l','--cleanup',dest='cleanup',action='store_true',help=Delete
the script on remote hosts after executing it.)
op.add_option('-f','--file',dest='file',help=File with hosts to use,
one host per line. Concatenated with list of hosts/IP addresses
specified at the end of the commandline. Optionally, in a line of the
file you can specify sequence: Address/Hostname Username Password
SSH_Port separated by spaces (additional parameters can be specified on
a subset of lines; where not specified, relevant parameters take default
values).)
op.add_option('-d','--dir',dest='dir',help='Directory for storing
standard output and standard error of command. If specified, directory
will be created, with subdirs named IPs/hostnames and relevant files
stored in those subdirs.')
op.add_option('-u','--username',dest='username',help=Username to
specify for SSH. Defaults to 'root'.)
op.add_option('-p','--password',dest='password',help=Password.
Password is used first; if connection fails using password, cssh uses
SSH key (default or specified).)
op.add_option('-o','--port',dest='port',help=Default SSH port.)
op.add_option('-k','--key',dest='key',help=SSH Key file. Defaults to
'/root/.ssh/id_dsa'.)
op.add_option('-n','--nokey',dest='nokey',action=store_true,
help=Turns off using SSH key.)
op.add_option('-t','--timeout',dest='timeout',help=SSH connection
timeout. Defaults to 20 seconds.)
op.add_option('-m','--monochromatic',dest='mono',action='store_true',help=Do
not use colors while printing output.)
op.add_option('-r','--maxthreads',dest='maxthreads',help=Maximum
number of threads working concurrently. Default is 100. Exceeding 200 is
generally not recommended due to potential exhaustion of address space
(each thread can use 10 MB of address space and 32-bit systems have a
maximum of 4GB of address space).)
op.add_option('-q','--quiet',dest='quiet',action='store_true',help=Quiet.
Do not print out summaries like IPs for which communication succeeded or
failed, etc.)
# add resource file?
(opts, args) = op.parse_args()
failit = False
if opts.cmd == None and opts.script == None:
print You have to specify one of the following: command to run,
using -c command or --cmd command, or script to run, using -s scriptfile
or --script scriptfile.
print
failit = True
if opts.cmd != None and opts.script != None:
print Options command (-c) and script (-s) are mutually exclusive.
Specify either one.
print
failit = True
if opts.cmd == None and opts.script != None:
try:
scriptpath = opts.script.split()[0]
scriptfo = open(scriptpath,'r')
scriptfo.close()
except IOError:
print Could not open script file %s. % opts.script
print
failit = True
if opts.file == None and args == []:
print You have to specify at least one of the following:
print - list of IPs/hostnames at the end of the command line
(after all options)
print - list of IPs/hostnames stored in file specified after -f
or --file option (like: -f hostnames.txt)
print You can also specify both sources. In that case IP/hostname
lists will be concatenated.
print
failit = True
if opts.password == None and opts.nokey:
print Since using key has been turned off using -n option, you
have to specify password using -p password or --password password.
print
failit = True
if opts.key is not None and opts.nokey:
print Options -n and -k keyfile are mutually exclusive. Specify
either one.
print
failit = True
if failit:
sys.exit(0)
if opts.scriptdir == None:
opts.scriptdir = '/tmp'
if opts.cleanup == None:
opts.cleanup = False
if opts.key == None:
opts.key = '/root/.ssh/id_dsa'
if opts.port == None:
opts.port = 22
if opts.nokey:
opts.key = None
if opts.timeout ==
