The Goldfish

Stunnel is a quick way on taking a non ssl connection and being able to wrap it in ssl for security

stunnel version 4 – Fedora 12/RHEL 5.3 /Centos 5.3

vim /etc/stunnel/stunnel.conf

add in

client=yes
[gmail]
accept  = 127.0.0.1:50000
connect = mail.google.com:443

then run

stunnel

stunnel version 3 – Ubuntu 8.10 (I haven’t used newer versions)

Ubuntu 8.10 has 2 versions of stunnnel: stunnel3 and stunnel4. They have created a symbolic link from /usr/bin/stunnel -> /usr/bin/stunnel3

If you would like to use version 4 you can use the command stunnel4 otherwise if you wish to use the default version, you will need to create a self signed certificate

openssl req -new -x509 -days 3650 -nodes -out /etc/stunnel/stunnel.pem -keyout /etc/stunnel/stunnel.pem

Then to start stunnel use the following command

stunnel -c -d localhost:50001 -r mail.google.com:443

Sysadmin stunnel

I quite often need to remove a single line from a file by its line number. The most common use case for me is the known_hosts file when I have reinstalled a system, I have in the past used vim and navigated to the line then removed it. This is all well and good but it gets to be a pain having to do it repeatedly, especially when you manage around 1000 servers and the get rebuilt frequently. Finally today I had had enough so wrote a little script to do this task easily. Hopefully someone else finds this useful

Its usage is : delline LINE FILE

#!/bin/bash
LINE=$1
FILE=$2
if [ ! -f $FILE ] ; then
    echo "can't read $FILE: No such file or directory"
    exit 1
fi
if [ `expr $LINE + 1 2> /dev/null` ] ; then
    sed -i "${LINE}d" $FILE
else
    echo $LINE is not numeric
    exit 1
fi

Linux, Sysadmin bash, sed