Shrink LVM size of root partition

Please refer:

http://rbgeek.wordpress.com/2013/02/11/how-to-reduce-the-root-partition-in-lvm/

Wordpress: Missing a temporary folder while uploading media

Upon reading many wordpress forums, finally got a solution.

Simply follow the below steps to solve this,


1. Create a  custom php.ini file in public_html folder.

2. Add the following lines in php.ini file:

upload_max_filesize = 16M
upload_tmp_dir = on
upload_tmp_dir = /home/username/tmp

Please make sure to replace username with your hosting username

3. Copy the same php.ini file to your wp_admin folder.

Can access WHM, but cannot through SSH

Try with the below URL

http://ip:2086/scripts2/doautofixer?autofix=safesshrestart

  This will reset the SSH configuration. 

Move magento site from subdomain to main domain

Its quite easy to move magento site from subdomain to main domain (and vice-versa). You can do it by two different ways and it is more easy when you go with the below steps.

Step 1:

1. Go to Magento Admin Page –> System –> Configurations –> Web –> Unsecure URL & Secure URL. Change both the secure URL and unsecure URL to the domain that you are going to be moved to. Be sure to include the “/” at the end of the domain name.
2. Go to your File Manager and click “Select All”. Click “Move” and key in “/public_html” to move it to the main domain’s directory.
3. You need to clear the caches at “var/cache” and “var/session” after you have moved all files over.

Step 2:

1. Go to phpMyAdmin. Find and and choose your database on which your magento site is running. Scroll down and look for core_config_data table and click “Browse”.
2. Find the path “web/unsecure/base_url” and “web/secure/base_url”.
3. Click on the "Edit" of both of the path above and edit the URLs accordingly. Click “Go” after the URLs have been edited.
4. Once the URLs has been edited, you need to clear the caches at “var/cache” and “var/session” 

Note:- It is always good to have backup your files and databases before doing these exercises.

SSH not working after removing Cloudlinux

   Usually we just remove Cloudlinux kernel from the server and reboot the server to run with normal CentOS kernel. After rebooting the server, we might face SSH access to the server. The server will prompt password and after entering the password, it will show 'Lost Login' details then you face "Connection Closed" issue.

Cause:

   While removing Cloud-Linux from the server, the pam module of sshd service still remains on the server. This caused unable to access the server through SSH.

   The caused pam module is pam_lve.so.


Solution:

  You need to comment the below line in the file called /etc/pam.d/sshd (login the server through KVM or any other interface you have to access the server shell)

   session required pam_lve.so 500 1 wheel,other

Swap Partition Change

   This tutorial will explain about how to change that Swap space partition to the newly attached drive[ here its /dev/sdd]

   Currently the swap space has been allocated on the drive /dev/sdc. In order to check the swap space details, use the below command.

# swapon -s
Filename    Type  Size Used Priority
/dev/sdc1                             partition 4192924 102580 -1

   Also check the mounted partitions details on /etc/fstab file

# cat /etc/fstab
/dev/sda / ext4 usrjquota=quota.user,jqfmt=vfsv0 0 0
/usr/tmpDSK             /tmp                    ext3    defaults,noauto        0 0
/dev/sdc1   swap swap defaults 0 0

   Then look onto the details about the newly attached drive using fdisk command. The output in our case is below. Here the older swap disk is /dev/sdc with Linux Swap partition and the new raw drive [/dev/sdd] has been attached.

Disk /dev/sdc: 4294 MB, 4294967296 bytes
255 heads, 63 sectors/track, 522 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x9fc28f0c

    Device Boot      Start         End      Blocks   Id  System
/dev/sdc1               1         522     4192933+  82  Linux swap / Solaris

Disk /dev/sdd: 4294 MB, 4294967296 bytes
255 heads, 63 sectors/track, 522 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000


   Now, create a swap partition on the newly attached drive by using the below commands,

# fdisk /dev/sdd -- accessing the drive to create a partition
then press 'm' for help, there you can see many command option to create partition and make it as swap partition. command 'n' for creating new partition, 't' to change the partition type.
  Once the partition has been created with Linux Swap type, you can see these details by pressing 'p' to print the partition lists, once verified the new settings, press 'w' to write the changes on the disk.

Disk /dev/sdd: 4294 MB, 4294967296 bytes
255 heads, 63 sectors/track, 522 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x9c471342

   Device Boot      Start         End      Blocks   Id  System
/dev/sdd1               1         522     4192933+  82  Linux swap / Solaris


   Lets issue the command 'partprobe' to tell about the new changes on the disk to the kernel, in order to reboot the server. Then make swap space on the newly created partition by using the below command.
# mkswap /dev/sdd1
Setting up swapspace version 1, size = 4192928 KiB
no label, UUID=09e7d007-2459-4d9d-bc6b-8d8cd1825596

   Once the swap partition has been created on the new partition, use the 'swapon' command to use this drive as follows and to see the active swap partition, you can use 'swapon -s' command.
# swapon /dev/sdd1
# swapon -s
Filename    Type  Size Used Priority
/dev/sdc1                             partition 4192924 102580 -1
/dev/sdd1                              partition 4192924 0 -2

   We have achieved the target now, and the server is using two partitions for swap space. Here the drives /dev/sdc and /dev/sdd being used for Swap Space.
   If you want to remove the old drive from the Swap partition, yes we can do this by simply issuing the below command with the drive name.
# swapoff /dev/xdc1

   Once the old drive has been swap off, we can ensure this by issuing the 'swapon -s' command to see the current swap space details. Also make the necessary changes for swap on the /etc/fstab, in order to take effect on next boot. This means, change the drive name on /etc/fstab to new one.

# swapon -s
Filename    Type  Size Used Priority
/dev/sdd1                              partition 4192924 0 -1