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5. User Guide for Linux Instances
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AMAZON ELASTIC COMPUTE CLOUD
USER GUIDE FOR LINUX INSTANCES
* What is Amazon EC2?
* Set up
* Get started tutorial
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* Tutorials
* Install LAMP on Amazon Linux 2022
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* Amazon Machine Images
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* Placement groups
* Share a placement group
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* Network MTU
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* Security
* Infrastructure security
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* Identity and access management
* IAM policies
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* Tag resources during creation
* Control access to EC2 resources using resource tags
* Example policies for CLI or SDK
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* AWS managed policies
* IAM roles
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* Key pairs
* Create key pairs
* Tag a public key
* Describe public keys
* Delete a public key
* Add or remove a public key on your instance
* Verify keys
* Security groups
* Security group rules
* Connection tracking
* Default and custom security groups
* Work with security groups
* Security group rules for different use cases
* AWS PrivateLink
* Update management
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* NitroTPM
* Considerations
* Prerequisites
* Create a Linux AMI for NitroTPM support
* Verify whether an AMI is enabled for NitroTPM
* Enable or stop using NitroTPM on an instance
* Storage
* Amazon EBS
* EBS volumes
* EBS volume types
* General Purpose SSD volumes
* Provisioned IOPS SSD volumes
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* Size and configuration constraints
* Create a volume
* Attach a volume to an instance
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* Make a volume available for use
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* Monitor the status of your volumes
* Detach a volume from an instance
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* Fault testing
* EBS snapshots
* Create snapshots
* Delete a snapshot
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* Guidelines and best practices for archiving snapshots
* Required IAM permissions
* Work with snapshot archiving
* Monitor snapshot archiving
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* Use EBS direct APIs
* Read snapshots
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* Use encryption
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* Automate the snapshot lifecycle
* Amazon Data Lifecycle Manager
* Automate snapshot lifecycles
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* View, modify, and delete lifecycle policies
* AWS Identity and Access Management
* AWS managed policies
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* Monitor the lifecycle of snapshots and AMIs
* Monitor your policies using CloudWatch Events
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* EBS data services
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* Extend a file system
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* Resource locations
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* List and filter your resources
* Tag your resources
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* Troubleshoot
* Troubleshoot launch issues
* Connect to your instance
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* Boot from the wrong volume
* EC2Rescue for Linux
* Install EC2Rescue for Linux
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* EC2 Serial Console
* Configure access to the EC2 Serial Console
* Connect to the EC2 Serial Console
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* Troubleshoot your instance using the EC2 Serial Console
* Troubleshoot your Linux instance using GRUB
* Troubleshoot your Linux instance using SysRq
* Send a diagnostic interrupt
* Related information
* Document history
Amazon EBS snapshots - Amazon Elastic Compute Cloud
AWSDocumentationAmazon EC2User Guide for Linux Instances
How incremental snapshots workCopy and share snapshotsEncryption support for
snapshots
AMAZON EBS SNAPSHOTS
PDFRSS
You can back up the data on your Amazon EBS volumes to Amazon S3 by taking
point-in-time snapshots. Snapshots are incremental backups, which means that
only the blocks on the device that have changed after your most recent snapshot
are saved. This minimizes the time required to create the snapshot and saves on
storage costs by not duplicating data. Each snapshot contains all of the
information that is needed to restore your data (from the moment when the
snapshot was taken) to a new EBS volume.
When you create an EBS volume based on a snapshot, the new volume begins as an
exact replica of the original volume that was used to create the snapshot. The
replicated volume loads data in the background so that you can begin using it
immediately. If you access data that hasn't been loaded yet, the volume
immediately downloads the requested data from Amazon S3, and then continues
loading the rest of the volume's data in the background. For more information,
see Create Amazon EBS snapshots.
When you delete a snapshot, only the data unique to that snapshot is removed.
For more information, see Delete an Amazon EBS snapshot.
SNAPSHOT EVENTS
You can track the status of your EBS snapshots through CloudWatch Events. For
more information, see EBS snapshot events.
MULTI-VOLUME SNAPSHOTS
Snapshots can be used to create a backup of critical workloads, such as a large
database or a file system that spans across multiple EBS volumes. Multi-volume
snapshots allow you to take exact point-in-time, data coordinated, and
crash-consistent snapshots across multiple EBS volumes attached to an EC2
instance. You are no longer required to stop your instance or to coordinate
between volumes to ensure crash consistency, because snapshots are automatically
taken across multiple EBS volumes. For more information, see the steps for
creating a multi-volume EBS snapshot under Create Amazon EBS snapshots .
SNAPSHOT PRICING
Charges for your snapshots are based on the amount of data stored. Because
snapshots are incremental, deleting a snapshot might not reduce your data
storage costs. Data referenced exclusively by a snapshot is removed when that
snapshot is deleted, but data referenced by other snapshots is preserved. For
more information, see Amazon Elastic Block Store Volumes and Snapshots in the
AWS Billing User Guide.
Contents
* How incremental snapshots work
* Copy and share snapshots
* Encryption support for snapshots
* Create Amazon EBS snapshots
* Delete an Amazon EBS snapshot
* Copy an Amazon EBS snapshot
* Archive Amazon EBS snapshots
* View Amazon EBS snapshot information
* Share an Amazon EBS snapshot
* Recover snapshots from the Recycle Bin
* Amazon EBS local snapshots on Outposts
* Use EBS direct APIs to access the contents of an EBS snapshot
* Automate the snapshot lifecycle
HOW INCREMENTAL SNAPSHOTS WORK
This section shows how an EBS snapshot captures the state of a volume at a point
in time, and how successive snapshots of a changing volume create a history of
those changes.
Relations among multiple snapshots of the same volume
The diagram in this section shows Volume 1 at three points in time. A snapshot
is taken of each of these three volume states. The diagram specifically shows
the following:
* In State 1, the volume has 10 GiB of data. Because Snap A is the first
snapshot taken of the volume, the entire 10 GiB of data must be copied.
* In State 2, the volume still contains 10 GiB of data, but 4 GiB have changed.
Snap B needs to copy and store only the 4 GiB that changed after Snap A was
taken. The other 6 GiB of unchanged data, which are already copied and stored
in Snap A, are referenced by Snap B rather than being copied again. This is
indicated by the dashed arrow.
* In State 3, 2 GiB of data have been added to the volume, for a total of 12
GiB. Snap C needs to copy the 2 GiB that were added after Snap B was taken.
As shown by the dashed arrows, Snap C also references 4 GiB of data stored in
Snap B, and 6 GiB of data stored in Snap A.
* The total storage required for the three snapshots is 16 GiB.
Relations among incremental snapshots of different volumes
The diagram in this section shows how incremental snapshots can be taken from
different volumes.
Important
The diagram assumes that you own Vol 1 and that you have created Snap A. If Vol
1 was owned by another AWS account and that account took Snap A and shared it
with you, then Snap B would be a full snapshot.
1. Vol 1 has 10 GiB of data. Because Snap A is the first snapshot taken of the
volume, the entire 10 GiB of data is copied and stored.
2. Vol 2 is created from Snap A, so it is an exact replica of Vol 1 at the time
the snapshot was taken.
3. Over time, 4 GiB of data is added to Vol 2 and its total size becomes 14
GiB.
4. Snap B is taken from Vol 2. For Snap B, only the 4 GiB of data that was
added after the volume was created from Snap A is copied and stored. The
other 10 GiB of unchanged data, which is already stored in Snap A, is
referenced by Snap B instead of being copied and stored again.
Snap B is an incremental snapshot of Snap A, even though it was created from
a different volume.
For more information about how data is managed when you delete a snapshot, see
Delete an Amazon EBS snapshot.
COPY AND SHARE SNAPSHOTS
You can share a snapshot across AWS accounts by modifying its access
permissions. You can make copies of your own snapshots as well as snapshots that
have been shared with you. For more information, see Share an Amazon EBS
snapshot.
A snapshot is constrained to the AWS Region where it was created. After you
create a snapshot of an EBS volume, you can use it to create new volumes in the
same Region. For more information, see Create a volume from a snapshot. You can
also copy snapshots across Regions, making it possible to use multiple Regions
for geographical expansion, data center migration, and disaster recovery. You
can copy any accessible snapshot that has a completed status. For more
information, see Copy an Amazon EBS snapshot.
ENCRYPTION SUPPORT FOR SNAPSHOTS
EBS snapshots fully support EBS encryption.
* Snapshots of encrypted volumes are automatically encrypted.
* Volumes that you create from encrypted snapshots are automatically encrypted.
* Volumes that you create from an unencrypted snapshot that you own or have
access to can be encrypted on-the-fly.
* When you copy an unencrypted snapshot that you own, you can encrypt it during
the copy process.
* When you copy an encrypted snapshot that you own or have access to, you can
reencrypt it with a different key during the copy process.
* The first snapshot you take of an encrypted volume that has been created from
an unencrypted snapshot is always a full snapshot.
* The first snapshot you take of a reencrypted volume, which has a different
CMK compared to the source snapshot, is always a full snapshot.
Complete documentation of possible snapshot encryption scenarios is provided in
Create Amazon EBS snapshots and in Copy an Amazon EBS snapshot.
For more information, see Amazon EBS encryption.
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