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Solusvm Access Denied !

I was working on my client’s solusvm admin panel that I got kicked out suddenly. I started getting the following message, whatever way I tried to access the admin control panel.


Access Denied! Contact the system administrator for support

I tried various ways to gain access, but nothing worked. The following trick helped me.

I logged in to the server as root via ssh and whitelisted my IP Address.


[root@abc ~]# cd /usr/local/solusvm/tmp/
[root@abc ~]# touch fixwhitelist
[root@abc ~]# chown solusvm.solusvm fixwhitelist
[root@abc ~]# vi fixwhitelist

Then enter your IP Address in that file, save and restart solusvm.

[root@abc ~]# /etc/rc.d/init.d/solusvm restart
Stopping solusvm: [ OK ]
Starting solusvm: [...

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Partitioning a new hard disk with parted

Fdisk is undoubtedly the most favorite disk partitioning tool for most linux savy peope. However fdisk has limitations when it comes to disk with space more than 2T. Redhat recommends parted now, starting from RHEL6. fdisk doesnt understand GUID partition table (GPT) and it is not suited for disk bigger than 2T. You will have to use a more advanced tool “parted” for that.

Let us see how a new 3T disk can be partitioned using parted command. I will be showing just 1 partition here, taking up all space rest can be done the same way. Normally, the disk will be labelled msdos, and you need to label it as GPT.

The list command will show you the current disks and their details.

[root@abc ~]# parted –list
Model: ATA ST33000650NS (scsi)
Disk /dev/sda: 3001GB
Sector size (logical/physical): 512B...

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Hetzner server with > 2TB disk

Recently I ordered a Hetzner server for one of our clients. The server had two 3TB disks. Hetzner provides a command line installation of the desired OS once we login to their server. As such, I logged in to the server and installed Centos6 by executing “installimage” option as suggested by Hetzner.

After installing OS and rebooting the server, I noticed that the 3T disk is not showing full space.

[root@abc ~]#df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda3        99G  2.5G   91G   3% /
tmpfs           463M     0  463M   0% /dev/shm
/dev/sda2       976M  126M  800M  14% /boot

/dev/sda4   2.3T     123M   2.2T  1% /home

If the disk size is greater than 2T you cannot use normal fdisk to create partition...

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Fatal error: Class ‘Net_SMTP’ not found in /usr/local/lib/php/Mail/smtp.php on line 349″

I was trying to setup a php script to send mail with SMTP Authentication. The script was ready, but when executed in a browser, it displayed the following error.

Fatal error: Class ‘Net_SMTP’ not found in /usr/local/lib/php/Mail/smtp.php on line 349″

The problem appears because the php pear package Net_SMTP is not present in the server. You can install it in two way.

  1. Install the Mail package with –alldeps which will install all required dependencies like Net_SMTP

pear install –alldeps Mail

If Mail is already installed, and if it refuses to get installed then you can force the installation as follows.

pear install –alldeps -f Mail

2.  If Mail is already installed, then you can install the Net_SMTP option alone as follows.

pear install Net_SMTP

After that, execute the script again and...

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Linux Booting Process

You turn on a linux machine, a splash screen appears for a few seconds and then in a small delay you are greeted with a login page. You login and then starts working. Ever wondered what happens behind the scenes, when you turn on the machine? How does the machine boots? Continue reading.

The linux booting process happens in 6 stages.
Stages-of-Linux-Boot-Process

1) BIOS
————

When you power on the machine, CPU asks ROM what to do. ROM has a JUMP instruction which commands CPU to check the BIOS. BIOS stands for Basic Input/Output system. BIOS is the first thing that is loaded, and its main role is to check the hardware and performs integrity checks. Its main role is to identify the boot device as defined in the CMOS...

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Class ‘horde_Hooks’ not found

After recent cpanel update, I started getting the following error while accessing horde webmail.

A fatal error has occurred

Class ‘horde_Hooks’ not found

Details have been logged for the administrator.

This problem is expected to be fixed before cPanel 11.51 becomes 11.52 and is published to CURRENT, but it is still occurring in the 11.51 build that is in EDGE right now. The temporary fix for that problem is as follows.

Run the below commands.

[root@abc ~]# find /usr/local/cpanel/base/horde -name ‘hooks.php’ -not -wholename ‘*/imp/*’

[root@abc ~]# find /usr/local/cpanel/3rdparty/php/54/lib/php/Horde/Core -name ‘hooks.php’ -not -wholename ‘*/imp/*’

Now, move or remove any files that are listed by the above find commands...

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df showing wrong result

My mysql server suddenly started showing my disk space usage as almost full.

[root@abc /]# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda3       550G  508G   14G  98% /
tmpfs            32G     0   32G   0% /dev/shm
/dev/sda1       2.0G  173M  1.8G   9% /tmp

But when I issued a disk usage check on / , it returned the usage to be very little.

[root@abc /]# du -sch
47G     .
47G     total

I was sure there is something wrong. Hence, I checked for deleted files. You can use either of the following commands.

[root@abc /]# lsof +L1

mysqld    23193     mysql    5u   REG    8,1          184     0       13 /tmp/ibrUf6yr (deleted)
mysqld    23193     mysql    6u   REG    8,1            0     ...

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Enabling detailed debug log in imap

Sometimes your might need to check for detailed logging in email. One of my friends was  developing an email application and he wanted to check what was happening behind the screen when he received an email, moves it to another folder, deletes it etc.

Hence, we decided to enable detailed logging in imap. It was a cpanel server and we used the option imapdebug. Always keep a backup of the file you edit.

root@abc# cp -pv /usr/lib/courier-imap/etc/imapd /usr/lib/courier-imap/etc/imapd.bak.$(date +%F)

root@abc# vi /usr/lib/courier-imap/etc/imapd

Now uncomment the following line.

IMAPDEBUGFILE=”imaplog.txt”

Now touch a file named  imaplog.txt at the root of the account where you want to enable logging. Restart the courier service. Suppose I need to enable logging for greproot@abc.com.

root...

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(28)No space left on device: mod_rewrite: Parent could not create RewriteLock file

Noticed this error in a cpanel server while starting apache. Apache refused to start with the following error.

(28)No space left on device: mod_rewrite: Parent could not create RewriteLock file

Seeing the error, the first thing that I checked was the disk space in the server but it looked fine.

root@abc [~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg0-root   16G  1.2G   14G   8% /
/dev/mapper/vg0-home  249G  124G  113G  53% /home
/dev/mapper/vg0-var    23G  7.0G   15G  33% /var
/dev/mapper/vg0-usr    23G  7.6G   14G  36% /usr
/dev/mapper/vg0-tmp   9.5G  151M  8.9G   2% /tmp
/dev/sda1             7.4G  184M  6.9G   3% /boot
tmpfs                 7.9G     0  7...

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PHP Warning: mysql_connect(): No such file or directory

I was getting the following error while trying out a basic mysql connection script.

PHP Warning: mysql_connect(): No such file or directory

The script I used was as follows.

<?php
$mysql_hostname = “localhost”;
$mysql_user = “root”;
$mysql_password = “abc123”;
$mysql_database = “testdb”;

$link = mysql_connect($mysql_hostname, $mysql_user, $mysql_password);
mysql_select_db($mysql_database,$link);
if (!$link) {
die(‘Could not connect: ‘ . mysql_error());
}
else
echo ‘Connected successfully’;
?>

Executing the script returned the following error.

root@abc:/var/www/html/scripts# php test.php
PHP Warning:  mysql_connect(): No such file or directory in /var/www/html/scripts/test.php on line 7
PHP Warning:  mysql_select_db() expects parameter 2 to be resource, boolean given in /var/www/html/...

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