Tag Archives: bash

Central Rsyslog server with TLS encrytion. | rsyslog log central splunk

Certificate setup.

Server Certificate.

Create the following directory

Install the following package to enable encryption on rsyslog.

Execute the following command which create the certificates.

Client Certificate.

 

Copy the following three certificates to the client machine to the following location /etc/ssl/rsyslog/.

 

 

Server Setup.

Create the following configuration file.

Restart the server.

This will allow the changes to take effect.

Running netstat will show you that its listen on encrypted and un-encrypted ports for logging traffic.

Client Setup.

Replace the SERVER with the IP address of your rsyslog server.

Restart rsyslog on the client so that changes can take effect.

Now to test the logs are transmitted execute.

To verify that the logs are received on the encrypted port, connect to the server and run the following.

This will listen for traffic on the encrypted port. Successful results should look like this.

 

Converting a text file from uppercase to lowercase. | converting text files from uppercase to lowercase

I had a bunch of hostnames in a text file, but some were uppercase and some lowercase. This presents problems when searching and automating tasks, so  I wanted a way to convert them all into lowercase as all text should be in Linux.

Here we are using “tr” to completed this task.

 

Syslog permissions blocking Splunk Access | syslog splunk permissions /var/log/messages

Had a problem splunk having access permissions to /var/log/messages, syslog would change the permissions to read only by root and no one else. The fix is in the syslog config file. See below.

Should have an entry like this 

Pay particular attentions to,

Then restart syslog

 

RHEL and Fedora setting password expiry | bash linux password expire chage

A very common Linux administration task is to set user account to expire their password and request a new account password from the user.

To see what the current policy is set to, execute the following.

You should see output like.

You can change the password expiry with the following command

 

Setup a backup job for your LAMP sites. | Setup a backup job for your LAMP sites.

I wrote a script which takes a backup of my webserver, taking a snapshot of all the website content, database, and configuration files.

Theory is if the webserver died, we would be about to result quickly using the data backed up.

On the server, put the following script and below is the cron entry which triggers every week. You will need up change the username and password for your mysql server.

This is the cron entry which fires up every friday.

Now this script will be on a linux machine somewhere else, it will connect and copy the backup archive file generated. You must first setup the ssh key so that its passwordless connection.

Simplicity it key! It works and will get you out of trouble. Well worth the 5minute investment.

 

 

Simple way to backup your MySQL database everyday! | backup your mysql database everyday with this bash script.

This is a simple script to backup your MySQL database everyday and compress it on the fly, you just need to add an entry into Cron. see below

Script

The script will also data the new backup which stops it overriding the previous backup.

Edit cron

Enter this

This will kick off everyday at 9:22pm

Get an email when your public IP changes | get notified when your public ip changes.

Alot of us have ISPs which change your IP address and you may not want to setup a client with a dynamic IP or want a backup in case the services fails.

So i developed a bash script which checks to see if your public IP has changed. If it has it will log it and email you the new IP.

See below.

 

 

Dump1090 to MySQL Script | send flight data from dump1090 to mysql

I wanted a script which would read all the live dump1090 aircraft data and log it to a mysql database.

This base script does it, it will dump all the data to Mysql every minute.

It will start the dump1090 server and kick off a process which reads/sorts and inserts.

 

Bash script to generate a sitemap.xml on a WordPress instance | bash script to generate a sitemap.xml for wordpress

There are free online tool to generate sitemap.xml, but the one I used would only index 500 pages. My site www.techinterchange.com.au has more, so I decide to write a bash script which ill index the site and generate an sitemap.xml.

Its simple, ill continue to add features and make it more reliable. This is only working with WordPress atm, Ill improve with the next revision.

 

 

Having your Linux system email you! | How to write a script which emails you

Quite often you need to write scripts which need to email you urgent information, there is a very simply way to do this.

First we need to install an email server to transmit the emails.

Then insert the following into your script.

In the above example it will email a copy of your local host file, change be change for any file you want transmitted.

See this script for a working example.