Archive for December, 2011

Fix categories and tags in wordpress custom post_type

By default word press does not look in to custom post_types for categories and tags, even though the category names are visible you get a NOT FOUND page when you click on the category.

A work around found for this issue is :

Edit : functions.php

add_filter('pre_get_posts', 'query_post_type');
function query_post_type($query) {
if(is_category() || is_tag()) {
$post_type = get_query_var('post_type');
if($post_type)
$post_type = $post_type;
else
$post_type = array('post','custom_post_type_name','nav_menu_item'); // replace custom_post_type_name with your post_type, and keep nav_menu_item to display menu in category page.
$query->set('post_type',$post_type);
return $query;
}
}

Reference: http://wordpress.org/support/topic/custom-post-type-tagscategories-archive-page

Thanks to paranoid  for guiding to the fix .

./arun

Replace broken hard drive in software RAID1

This scenario assumes that you have two hard disk with RAID1 setup and one of them is broken (say sdb).

To check the status of RAID:

$ cat /proc/mdstat

Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md2 : active raid1 sda3[1]
730202368 blocks [2/1] [U_]
md1 : active raid1 sda2[1]
264960 blocks [2/1] [U_]
md0 : active (auto-read-only) raid1 sda1[1]
2102464 blocks [2/1] [U_]

you will see [_U] or [U_] if there is a broken RAID.

If required remove the broken hardrive from RAID from all md devices.

# mdadm --manage /dev/md0 --fail /dev/sdb1

# mdadm --manage /dev/md2 --fail /dev/sdb3

Shutdown the machine and replace the hard drive.

Once the server is booted, you will see the new device (either sda or sdb depends on what drive is broken)

# ls -l /dev/sd*

Now we need to replicate the partition schema on the new drive.

sfdisk -d /dev/sda | sfdisk /dev/sdb

// -d     Dump the partitions of a device

We can add the partition to the RAID now, you could verify the partitions with fdisk -l.

# mdadm --manage /dev/md0 --add /dev/sdb1

# mdadm --manage /dev/md2 --add /dev/sdb3

It will start sync the data and will be ready once completed.

You may verify the mdstat

# cat /proc/mdstat
Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md2 : active raid1 sda3[0] sdb3[1]
7302023 blocks [2/2] [UU]

md0 : active (auto-read-only) raid1 sda1[0] sdb1[1]
21024 blocks [2/2] [UU]

./arun