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Full Discussion: How to check if a Port is accepting connections.
Top Forums Shell Programming and Scripting How to check if a Port is accepting connections. Post 302341855 by RiSk on Thursday 6th of August 2009 06:05:08 PM
Old 08-06-2009
netcat

nc -vz -w 10 ip port

just be aware that the [[:digit:]] will not work in hpux, nor do you really need it, you can take my bash code below and fill in your details.



Code:
#!/bin/bash

lolb=`awk '/[[:digit:]]/ { print $5}' /var/www/htdocs/vip/.form.php | cut -d \" -f 2 | grep [[:digit:]]`
EMAIL_TXT=/home/svcsuprt/email.txt
NEED_MAIL=0

# This is where we make the EMAIl_TXT data, first we remove the old one to ensure there is no munged data, 
# then add a header with some info in it.

cat /dev/null > /home/svcsuprt/email.txt
echo "Cannot connect the the following Load Balancers, please correct this asap as it impacts http://sitescope/vip" > $EMAIL_TXT
echo " " >> $EMAIL_TXT

# This is the main loop of the script that uses netcat to see if it can connect to 22, if it cannot, it goes in EMAIL_TXT

for ip in $lolb; 

        do /usr/bin/nc -vz -w 10 $ip 22;
                if [ $? -eq 1 ]
        then
                echo "$ip failed connectivity testing" >> $EMAIL_TXT; export NEED_MAIL=1
        fi; 
done;

## Send email

if [ ${NEED_MAIL} -eq 1 ]
        then
        cat /home/svcsuprt/email.txt | /bin/mailx -s "Load Balancer SSH test" email@tld.com

fi

 

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LEARN ABOUT SUSE

calibre-smtp

CALIBRE-SMTP(1) 						      calibre							   CALIBRE-SMTP(1)

NAME

       calibre-smtp - part of calibre

SYNOPSIS

       calibre-smtp  [options] [from to text]

DESCRIPTION

       Send  mail using the SMTP protocol. calibre-smtp has two modes of operation. In the compose mode you specify from to and text and these are
       used to build and send an email message. In the filter mode, calibre-smtp reads a complete email message from STDIN and sends it.

       text is the body of the email message.  If text is not specified, a complete email message is read from STDIN.  from is the  email  address
       of the sender and to is the email address of the recipient. When a complete email is read from STDIN, from and to are only used in the SMTP
       negotiation, the message headers are not modified.

       Whenever you pass arguments to calibre-smtp that have spaces in them, enclose the arguments in quotation marks.

OPTIONS

       --version
	      show program's version number and exit

       -h, --help
	      show this help message and exit

       -l, --localhost
	      Host name of localhost. Used when connecting to SMTP server.

       -o, --outbox
	      Path to maildir folder to store failed email messages in.

       -f, --fork
	      Fork and deliver message in background. If you use this option, you should also use --outbox to handle delivery failures.

       -t, --timeout
	      Timeout for connection

       -v, --verbose
	      Be more verbose

   COMPOSE MAIL
       Options to compose an email. Ignored if text is not specified

       -a, --attachment
	      File to attach to the email

       -s, --subject
	      Subject of the email

   SMTP RELAY
       Options to use an SMTP relay server to send mail. calibre will try to send the email directly unless --relay is specified.

       -r, --relay
	      An SMTP relay server to use to send mail.

       --port Port to connect to on relay server. Default is to use 465 if encryption method is SSL and 25 otherwise.

       -u, --username
	      Username for relay

       -p, --password
	      Password for relay

       -e, --encryption-method
	      Encryption method to use when connecting to relay. Choices are TLS and SSL. Default is TLS.

SEE ALSO

       The User Manual is available at http://calibre-ebook.com/user_manual

       Created by Kovid Goyal <kovid@kovidgoyal.net>

calibre-smtp (calibre 0.6.53)					     July 2010							   CALIBRE-SMTP(1)
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