devnumbertwo

the problem: “Your PHP installation appears to be missing the MySQL extension which is required by WordPress.” is shown when attempting to install wordpress on windows

try this: check your php.ini file and make sure the following line is uncommented (i.e. does not have a semi colon in front of it):

extension=php_mysql.dll

if that is ok, then check for the line in the file that designates the location of the extension_dir. by default mines said:

extension_dir = "./"

but i had to change it to the following and then it worked (note: my php installation directory is c:\php):

extension_dir = "C:\php\ext"

the problem: assigning an elastic ip to an ec2 instance doesn’t work – can’t see your website.

try: checking the windows firewall – the standard rule that allows the tcp standard ports through doesn’t seem to be enough. if you create a custom one allowing ports 80/443 that should work.

the problem: you have all your images loaded and iMovie doesn’t seem to work (but your images display just fine in things like iPhoto)

try: check your image names. any images that start with an underscore can cause this to happen. rename them and restart iMovie.

reducing swap on an LVM2 logical volume
to reduce an LVM2 swap logical volume (ex. /dev/swap is the volume you want to extend):

1. disable swapping for the associated logical volume:

   swapoff -v /dev/swap

2. reduce the LVM2 logical volume by 512 MB:

   lvm lvreduce /dev/swap -L -512M

3. format the new swap space:

   mkswap /dev/swap

4. enable the extended logical volume:

   swapon -va

5. test that the logical volume has been reduced properly:

   cat /proc/swaps
   free

removing an LVM2 logical volume for swap
to remove a swap volume group (assuming /dev/swap is the swap volume you want to remove):

1. disable swapping for the associated logical volume:

   swapoff -v /dev/swap

2. remove the LVM2 logical volume of size 512 MB:

   lvm lvremove /dev/swap

3. remove the following entry from the /etc/fstab file:

   /dev/swap   swap     swap    defaults     0 0

4. test that the logical volume has been extended properly:

   cat /proc/swaps
   free

removing a swap file

1. at a shell prompt as root, execute the following command to disable the swap file (where /swapfile is the swap file):

   swapoff -v /swapfile

2. remove its entry from the /etc/fstab file.
3. Remove the actual file:

   rm /swapfile

the problem: attempting to mount an amazon EBS volume to an EC2 linux machine results in the following:

mount: wrong fs type, bad option, bad superblock on /dev/xvdf,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

this can happen if you did not format your volume… try these instructions
http://docs.amazonwebservices.com/AWSEC2/latest/UserGuide/ebs-using-volumes.html

for your convenience, it is also described here:

Caution: This procedure assumes you want to mount an empty volume. If you’re mounting a volume that already has data on it (e.g., a public dataset), don’t use mkfs before mounting the volume. Otherwise you’ll format the volume and delete the existing data.

Enter the following commands

yes | mkfs -t ext3 /dev/sdh

mkdir /mnt/data-store

mount /dev/sdh /mnt/data-store

as i attempted to edit some installation files to update scripts to point to a different directory than the defaults i realized that i needed to replace a string with one that would have slashes in it – eg. replacing ‘u01′ with ‘somewhere/else’

i then found out that “/” in the search/replace command is just a default and you can replace it with a different character:

%s#u01#somewhere/else#ABC#g
or
%s+u01+somewhere/else+g
or
%s_u01_somewhere/else_g

in a nutshell in order to have something mounted on startup under linux you will need to edit your /etc/fstab file. if you don’t know how to do that, take a look at the link below. it’s a pretty thorough yet easy to understand read on how to edit the fstab file:

http://www.tuxfiles.org/linuxhelp/fstab.html

i looked high and low for this and finally found it – works for PeopleTools 8.4x+:

note: you must have Tuxedo installed as it is required in order to run the Data Mover in a Unix shell.

execute the psconfig.sh to set the environment variables but first make sure the following variables in psconfig.sh have been modified to point the proper locations in your PS_HOME.

export PS_DM_DATA=default is $PS_HOME/data.
export PS_DM_SCRIPT=default is $PS_HOME/scripts.
export PS_DM_LOG=default is $PS_HOME/log.

. ./psconfig.sh

PS_DM_DATA = directory where the PS Data Mover executable searches for input data (.DAT) files.
PS_DM_SCRIPT=location of the ps Data Mover scripts files.
PS_DM_LOG=location of the PeopleSoft Data Mover log files.

run the PeopleSoft Data Mover executable:

psdmtx -CT dbtype -CS server -CD database name -CO user -CP password -CI connectid -CW connectpassword -FI filename.dms

it’s common to use a whole partition of a hard disk for swapping. however, with the 2.6 Linux kernel, swap files are just as fast as swap partitions…

login as the root user.

1. the following command will create 512MB swap file (1024 * 512MB = 524288 block size) — modify the math to create a file of a different block size):

   dd if=/dev/zero of=/swapfile1 bs=1024 count=524288

2. set up a Linux swap area:

   mkswap /swapfile1

3. activate /swapfile1 swap space immediately:

   swapon /swapfile1

4. to activate /swapfile1 after system reboot, add entry to /etc/fstab file

   vi /etc/fstab

   append the following line:

   /swapfile1 swap swap defaults 0 0

5. verify swap is activated

   free -m

1. Download the latest version of s3fs (which is a FUSE backend for S3 — note that fuse 2.8.4 is required for the latest version of s3fs) from http://code.google.com/p/s3fs/downloads/list

   wget http://s3fs.googlecode.com/files/s3fs-1.61.tar.gz 

2. Unpack it:

   tar zxf s3fs-1.61.tar.gz 

3. run ./configure and see if you need to install dependencies for building.
4. Build and install the code (this copies the binary s3fs to /usr/bin):

   make install

5. Edit a config file for storing your keys (you can check them out under Your AWS Account -> Security Credentials)

   touch /etc/passwd-s3fs && chmod 640 /etc/passwd-s3fs && echo 'AccessKey:SecretKey' > /etc/passwd-s3fs

   If you dont want to leave any trace of your secret key in your shell history, use a text editor to edit the file rather than echoing it.

6. Create a directory for mounting the S3 filesystem and mount it. Note that you can mount the s3fs anywhere you like:

   s3fs bucketname /mnt/mountpoint

7. Check it is woking correctly:

   grep s3fs /etc/mtab