SSH hangs for a particular command in SSH.exec!(cmd)

Ruby
1

Hi All,

I am trying to connect the remote ssh server via ruby using
Net::SSH.It is working fine for me for all the commands provided via
script and i could able to read the output of the command successfully.
But when i use the below command it is getting stuck in SSH.exec!(cmd)
and control is not returned from the line. Only if i click Ctrl+c in
command line the script is getting ended.
The command is ./wcsadmin.sh start --> this is used to start the
processes of my application in remote server

Please find the below code snippet of my ruby script:

Net::SSH.start(host, username, :password => password) do |ssh|
puts 'before exit'
output = ssh.exec!(/opt/wcsadmin.sh start)
puts 'Executed command'

The output of the command when i do it manually is :

[root@test bin]# ./wcsadmin.sh start

Starting Network Control System…

This may take a few minutes…
stty: standard input: Invalid argument

Network Control System started successfully.

Starting SAM daemon…
Done.
Starting DA daemon…
Starting DA syslog daemon…
start

if i use ssh.exec(’./wcsadmin.sh start’) the only difference is the
above output is getting printed but still the program is never ended.I
need to manually end it by hitting ctrl+c.When i searched in google i
could find you can use nohup command('nohup /opt/wcsadmin.sh start

/tmp/teststartserver.log 2>&1’) to skip the hangup signals and tried
the same.This also writes the output to teststartserver.log but getting
hanged.Can anyone please help me out on this issue?

Thanks in Advance!

Thanks,
Meena

2

On Thu, Mar 22, 2012 at 3:12 PM, Meena V. [email protected]
wrote:

output = ssh.exec!(/opt/wcsadmin.sh start)

the command to be execed should be in string format, so you’ ll have
to enclose it in quotes…

kind regards -botp

3

botp wrote in post #1052757:

On Thu, Mar 22, 2012 at 3:12 PM, Meena V. [email protected]
wrote:

output = ssh.exec!(/opt/wcsadmin.sh start)

the command to be execed should be in string format, so you’ ll have
to enclose it in quotes…

kind regards -botp

Hi Botp,

Thanks for your quick reply. I missed to add the same while posting
it(it is a Typo). i am using the command with quotes only as below:

Net::SSH.start(host, username, :password => password) do |ssh|
puts 'before exit'
output = ssh.exec!('/opt/wcsadmin.sh start')
puts 'Executed command'

But still facing the issue. Please help me.

Thanks,
Meena

4

On Thu, Mar 22, 2012 at 3:36 PM, Meena V. [email protected]
wrote:

Net::SSH.start(host, username, :password => password) do |ssh|
puts ‘before exit’
output = ssh.exec!(‘/opt/wcsadmin.sh start’)
puts ‘Executed command’

1 check your logs
2 check your username, it might not be root
3 try using the block format of ssh exec

btw, pls show versions of ruby and net-ssh and actual screenshots

kind regards -botp