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AWS Command line Tasks : Create EC2 instance and EC2 instance with 500GB root volume.

To create an EC2 instance from command line.

aws ec2 run-instances  --image-id ami-efe09bf8 --count 1 --instance-type m4.4xlarge --key-name mysshkey --security-group-ids sg-126adasd2--subnet-id subnet-148fd971 --block-device-mapping /dev/sda1=:500:false --region us-east-1

--image-id : The AMI ID which we are going to create the instance.
--count : The number of instances that we need to create.
--instance-type : The type of EC2 instance that we are going to use it.
--key-name : The pem that we are going to use to connect to this server.
--secrutiy group : The security group this instance is getting used.
--subnet-id : The subnet in which we want the ec2 instance.
--block device mapping - device:space in gb : to terminate volume [true or false.]

To create an EC2 instance with 500GB root volume.

aws ec2 run-instances --image-id ami-efe09bf8 --block-device-mappings  '[{"DeviceName":"/dev/sda1","Ebs":{"VolumeSize":500,"DeleteOnTermination":false}}]' --count 1 --instance-type m4.4xlarge --key-name mysshkey --security-group-ids sg-126adasd2 --subnet-id subnet-148fd971 --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

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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.

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

File system corrupted on the OpenVZ container.

It happens rarely but when it does, it is hard to handle. The OpenVZ VM's are usually stable in nature, but I've encountered situations where OpenVZ VM was showing file system error and was refusing to start.

You can follow the below steps to recover the VM.


1. ~# vzctl stop ctid

2. # ploop mount /vz/private/ctid/root.hdd/DiskDescriptor.xml
3. now do a df -h and you will get the ploop id for the VM.
4. fdisk -l /dev/ploop12345
5. e2fsck /dev/ploop12345p1
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