Σε βήματα, για να αλλάξουμε το CTID ενός VPS που σηκώνεται με openVZ
(καλό για να κλείνουν τα "κενά" στην αυτόματη αρίθμηση)

sourcecid=100
targetcid=101
vzctl chkpnt ${sourcecid} --dumpfile /tmp/openvz-renumber-dump.${sourcecid}
mv /etc/vz/conf/${sourcecid}.conf /etc/vz/conf/${targetcid}.conf
mv /vz/private/${sourcecid} /vz/private/${targetcid}
mv /vz/root/${sourcecid} /vz/root/${targetcid}
vzctl restore ${targetcid} --dumpfile /tmp/openvz-renumber-dump.${sourcecid}

PROBLEM
Στην τελευταία αναβάθμιση cPanel, στο δωρεάν plugin του Nginx , παρατηρείται το παρακάτω error:

SOLUTION
Ανοίγουμε το αρχείο /usr/local/cpanel/whostmgr/docroot/cgi/addon_nginx.cgi και κάνουμε comment τη γραμμή  use whmlib;

http://www.freepik.com/

To check all SQL databases, use the following commands:  

Check repair and optimize all SQL databases

mysqlcheck --all-databases -r #repair

mysqlcheck --all-databases -a #analyze

mysqlcheck --all-databases -o #optimize

    Useful! You can copy this code in a new .sh file and use it as a script, or even automate the optimisation using Cron

To see the total number of mails in the mailing queue:

Exim count mail in queue

exim -bpc

Use the following to see which scripts are sending out mail (helps keeping an eye on mailsenders and possible malware):

List the scripts sending mails and count for each one

grep cwd /var/log/exim_mainlog | grep -v /var/spool | awk -F"cwd=" '{print $2}' | awk '{print $1}' | sort | uniq -c | sort -n

To clear the mailing queue:

Exim clear the mail queue

exim -bp | awk '/^ *[0-9]+[mhd]/{print "exim -Mrm " $3}' | bash

Or even better, a “cleaner” approach:

exim -bp | exiqgrep -i | xargs exim -Mrm

To clear the Exim mailing statistics:

Clear Exim Statistics

cd /var/log

rm -fr exim*.1

rm -fr exim*.2

rm -fr exim*.3

rm -fr exim*.4

rm -fr exim_mainlog ; touch exim_mainlog ; chown mailnull.mail exim_mainlog

rm -fr exim_paniclog ; touch exim_paniclog ; chown mailnull.mail exim_paniclog

rm -fr exim_rejectlog ; touch exim_rejectlog ; chown mailnull.mail exim_rejectlog

To clean the eximstats MySQL database, enter MySQL with:

Enter the SQL eximstats DB

mysql eximstats

SQL commands (to be used within “mysql>”)

SQL commands to empty the tables

delete from sends;

delete from smtp;

Today a strange new customer ordered and purchased an unmanaged VPS with 5 IPs from me. Upon further investigation, the user’s order and ID where problematic, as they had been flagged as fraudulent by Maxmind (and by a few hosting companies as well).

Since there is nothing wrong with selling a VPS to anyone, but obliging him/them to a specific SLA and AUP, we can use iptables of the node in order to limit any kind of malevolent behavior and spamming, thus securing our remaining IP addresses from being blacklisted by major spam-listing organisations.

IPtables can be configured in the following way:

iptables -A FORWARD -o eth0 -p tcp -s 10.1.1.1 --dport 25 -m limit --limit 3/minute -m state --state NEW -j ACCEPT

iptables -A FORWARD -o eth0 -p tcp -s 10.1.1.1 --dport 25 -m state --state NEW -j LOG

iptables -A FORWARD -o eth0 -p tcp -s 10.1.1.1 --dport 25 -m state --state NEW -j DROP



# Limit outgoing mail to 5/hour, plus log and drop anyt surplusing mail. This way we won't cause loss of mail (mailserver will queue/spool and retry), but it will prevent spammers causing too much trouble

iptables -A FORWARD -p tcp --sport 25 --syn -m hashlimit --hashlimit-mode srcip --hashlimit-limit 5/hour --hashlimit-burst 6 -j ACCEPT

iptables -A FORWARD -p tcp --sport 25 --syn -j LOG

iptables -A FORWARD -p tcp --sport 25 --syn -j DROP

Got your back

Htop is a pretty nice fork of top, which almost makes you forget of using a GUI for simple monitoring tasks. It has pretty nice colours all around your terminal and allows you to have a nice idea of what’s-what, at a glimpse.

Run these commands for RHEL/CentOS and Fedora  Linux servers

yum groupinstall "Development Tools"

yum install ncurses ncurses-devel

wget http://hisham.hm/htop/releases/2.0.0/htop-2.0.0.tar.gz

tar xvfvz htop-2.0.0.tar.gz

cd htop-2.0.0

./configure

make

make install

Or, run these commands for Debian and Ubuntu Linux servers

sudo apt-get install build-essential  

sudo apt-get install libncurses5-dev libncursesw5-dev

wget http://hisham.hm/htop/releases/2.0.0/htop-2.0.0.tar.gz

tar xvfvz htop-2.0.0.tar.gz

cd htop-2.0.0

./configure

make

make install

If you succesfully followed our instructions, you’ll be able to use htop just by running:

htop

As simple as that 

Why we use the source files directly? Well, most tutorials on the internet, make use of EPEL repository. EPEL repo, has been discontinued, so although installing the repo and then running a simple sudo yum or sudo apt-get command to install htop, there is no guarantee that the version you’ve installed will be upgradable to newer versions.

Βιντεάτσι για τους οπτικούς τύπους. Γυρισμένο εξ'ολοκλήρου στα υπερσύγχρονα εργαστήριά μας (σαλοτραπεζαρία)
 

STEP 1Download the WordPress installation package

To start the installation process, first you need to download WordPress from it's official download page. We recommend that you always download and install the latest stable version of WordPress.

Once you click on the Download button for the latest WordPress version, the installation package will be saved to your hard disk. Locate the installation package that you've just downloaded and extract it to a new folder.

STEP 2Upload the WordPress Files to Your Server

Now, you need to upload the extracted files and folders to your web server. The easiest way to upload the installation files is via FTP. For detailed information on how to upload files via FTP, please check our FTP Tutorial.

Once the download is complete, extract the archive and upload it to your web hosting account. You can do that via FTP using a client application like Filezilla or via cPanel -> File Manager -> Upload file(s). If you want this WordPress installation to be main for your website, the files should reside in the public_html folder of your account. However, you can always make a subfolder (i.e. public_html/blog) if you want to run only part of your website on WordPress.

STEP 3Create a MySQL Database for WordPress to use

Now, you need to create a MySQL database and assign a user to it with full permissions. For detailed instructions on how to do that, please follow the steps described in our tutorial on How to Create MySQL Username and Database. Once you create your MySQL Database and User, make sure you write down the database name, database username and password you've just created. You will need those for the installation process.

STEP 4Go through the installation process

Now it's time to navigate to your website to start with the installation process. If you have uploaded WordPress in your public_html directory you'll need to go to http://yourdomain.com in your preferred browser. The first thing you will notice is a message, telling you that you don't have a wp-config.php file and you should create one. Just click on the Create a Configuration File button to proceed.

On this page you will see a message, asking you to prepare the necessary information for the installation. Since we already have this information, simply press the Go! button.

Enter the details for your newly created MySQL database and press the Submit button

WordPress will now check if your settings are correct. If you have entered all the necessary information, you will see a confirmation screen. Press the Run the Install button to proceed.

On the next screen you will have to enter the information about your administrative username and the title of your new site. In addition, you can specify whether you'd want search engines to index your site or not. Once you fill in that information, press the Install WordPress button. Bear in mind, however, that you should specify a real email address. It can be later used in case you forget your password.

1. Run the following outside the preferred account’s public_html folder:

chown user:nobody /home/USER/public_html

Run the following inside the preferred account’s public_html folder:

chown -R user:user /home/USER/public_html

find -type f -exec chown user.user {} \;

find -type f -exec chmod 644 {} \;

find -type d -exec chmod 755 {} \;

Παράθεση

Where user, is your accounts name

Dirty lil' pr1ck, αλλά τη δουλειά του την κάνει. Θα ανεβάσω με μορφοποίηση μόλις προλάβω να ασχοληθώ:

OWNER=$@
KONTA=`ls -1A /var/cpanel/users/`

count=1
for x in `echo -n "$KONTA"`;do
  wiersz=`grep -i ^dns /var/cpanel/users/"$x" |cut -d= -f2`
  DOMAIN[$count]=$wiersz
  count=$[$count+1]
  echo "Login:        `echo "$x"`"


    for i in `echo "${DOMAIN[@]}" | sed  's/ /\n/g'`;do
      for n in ` ls -A /home/"$x"/mail/"$i"/ 2>/dev/null`;do

           if   [ "$n" == "cur" ];then echo "$n" > /dev/null
           elif [ "$n" == "new" ];then echo "$n" > /dev/null
           elif [ "$n" == "tmp" ];then echo "$n" > /dev/null
           elif [ "$n" == "" ];then echo "$n" > /dev/null
           else
           echo  "$n"@"$i"
           fi
      done
    done
    echo;echo;
done

Σβήνει και τα Junk αγάπη μόνο  

Σου σπάνε τα νεύρα γιατί τα κρατάνε για 10ετίες μέσα στα διεγραμμένα τους? Βγάνε ένα φιρμάνι και τρέχα το, το παρακάτω script
 

for domainhash in `cat /etc/userdomains | grep "\." | sed 's/ //'`
do
        read domain user <<<$(echo $domainhash | sed 's/:/ /');
                find /home/${user}/mail/${domain}/*/.Trash/{cur,new,tmp}/ -type f | xargs -ifile rm -f file
                        find /home/${user}/mail/${domain}/*/.Junk/{cur,new,tmp}/ -type f | xargs -ifile rm -f file
                        done

Δώσε κ μένα μπάρμπα

WordPress – Add SSL to your website

Adding an SSL certificate to your website, solves the issues with the latest Google Chrome tactics of labeling your website “Unsecure” and helps you provide a more secure place for your visitors and customers.

What is an SSL certificate?

SSL certificates are small data files that digitally bind a cryptographic key to an organization’s details. When installed on a web server, it activates the padlock and the https protocol and allows secure connections from a web server to a browser. This also provides the means for your visitor to visually identify your website as a legitimate website.

How to install in WordPress

First of all, an SSL Certificate is not a WordPress addon, but a Server/Domain configuration and installation, that your web hoster should help you to install. Period.
Having said that, there are many types of SSL certificates that might suite you.

The main issue that most WordPress admins face, is that having a variety of plugins installed on their wordpress, the will usually get a “Not Secure – Mixed Content” Message instead of the green Secure padlock on their browser address bar.
This can be easily be fixed using a plugin as well.

To activate SSL security on your WordPress site, simply follow these steps:
1. Make sure your hosting provider has implemented an SSL on your domain name (it can be a free SSL Certificate such as Let’s Encrypt, or a paid more secure and recognisable SSL Certificate such as Comodo Wildcard SSL)
ATTENTION!!! If you are not sure your web host has correctly installed an SSL Certificate for your Domain, Step 2 will render your WordPress unreachable! 
2. Login to your WordPress Admin area and go to Settings->General. In that page, change WordPress Address (URL) & Site Address (URL) to your https:// accordingly.

3. After having activated these, your wp-admin administration page, should be reachable and the green “Secure” padlock should appear. Google Chrome displays the word “Secure” in green colour instead of a green padlock.

If you receive an “info” icon instead it should mean you actually have Mixed Content on your website (links on your homepage that are https:// and links that aren’t, alltogether).
This is easily solvable using SSL Insecure Content Fixer plugin

This Plugin is quite easy to use. After installing it and activating it, you will find it under SSL Insecure Content Fixer. Its options are quite forthcoming , since you usually need to choose the options in the Fix insecure content section. A good advice is setting this option to “Capture” (most resource using but safest option), and then working your way upwards.

Same thing σε oneliner
 

wget http://wordpress.org/latest.tar.gz && tar xfz latest.tar.gz

Και ετοιμάζω oneliner και για την mysql του γιατί έτσι μόνο κατεβάζει και ξεπακετάρει

Θα στα κάνω one-liner ένα ένα, ακόμα στήνω το Omnivore

How to change the hostname of your VPS

Create the backup using the following command:

/scripts/pkgacct accountname

/scripts/restorepgk <package filename>

/usr/local/cpanel/bin/restorepkg --skipaccount cpmove-accountname.tar.gz