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AWS command line tasks - Create 500 GB EBS Volume, to attach and detach the volume

To create a volume of 500 GB 
aws ec2 --region us-east-1 create-volume --size 500 --availability-zone us-east-1d --volume-type gp2

size : in GB
availability zone : This needs to be in the same availability zone as that of the instance that we are going to attach the EBS volume.

To attach an EBS volume to the ec2 instance.

aws  ec2 attach-volume --volume-id vol-9dfjhsdkfj93 --instance-id i-1234567899oasd  --device /dev/xvdb --region us-east-1

After attaching format the drive and mount it like what we do for a normal hard disk drive.

To detach an EBS volume from the ec2 instance.

aws ec2 detach-volume --volume-id vol-9dfjhsdkfj93 --region us-east-1


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Qmail cheat sheet

http://supportlobby.com/blog/category/technical/qmail-technical/

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1) To check the mail queue in plesk from command line, you can use the command :

 /var/qmail/bin/qmail-qstat
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2) You can examine the queue with qmail-qread.

/var/qmail/bin/qmail-qread
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3) From the qread command you get the message id . In the above example , let us assume one of the id is 524514 . Now you can find the file holding the email in/var/qmail/queue with find command.

# find /var/qmail/queue -iname 524514

/var/qmail/queue/remote/22/524514

/var/qmail/queue/mess/22/524514 (mail headers)

/var/qmail/queue/info/22/524514

4) From the mail header you get the IP address

vi /var/qmail/queue/mess/22/524514


Or

Shortcut for the cool guys
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find /var/qmail/queue -iname queu_id | grep mess | xargs less

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4) If you wish …

Logical volume vmxxxx_img is used by another device - Error on LVM removal

Hi Folks,

I've faced error while trying to remove an LVM from the server.

The exact LVM error will be "Logical volume vmxxxx_img is used by another device" on executing the lvremove command.

Feel free to remove the following steps to remove the LVM from the server.

Note: Please remember to replace <id> with your VMID in the below section.

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dmsetup ls dmsetup info -c xen-vm<id>_img dmsetup remove xen-vm<id>_img lvremove -f /dev/xen/vm<id>_img ----------------------------------------------------------

Open VZ cheat Sheet

VZCTL COMMANDS
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vzctl set 101 --diskspace 1000000:1100000 --save  To set diskspace for container with ID 101

vzctl set 101 --diskinodes 90000:91000 --save     To set inodes for container with ID 101

vzctl set 101 --quotatime 600 --save              To set quotatime for container with ID 101 (The time limit by

                                                       which container is allowed to temporarily exceed  its quota soft limits)

vzctl exec 101 df                                  To execute command df at the server with the CTID 101

vzctl set 101 --quotaugidlimit 100 --save          Set number of user/group id's allowed for internal disk
                                                                     quota,if 0 UID/GUID quota will not be allowed\

 vzctl set 0 --dcachesize 5G --save        Set dcachesize of the hardware node

sysctl fs.fsync-enable=0     or  echo 0 > /proc/sys/fs/fsync-enable        disable fsync calls inside containers .

Add the  …