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AWS Copy AMI to another Region

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Here’s how to copy an AMI to another region.

aws ec2 copy-image \
  --source-image-id ami-xxxxxxxxxxx \
  --source-region us-east-1 \
  --region us-east-2 \
  --name "My DR server"

Output:

{
    "ImageId": "ami-xxxxxxxxxxx"
}

AWS Copy Snapshot to another Region

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If you need to copy a snapshot from one region to another, here’s the AWS CLI command.

aws ec2 copy-snapshot \
    --region us-east-1 \
    --source-region us-east-2 \
    --source-snapshot-id snap-xxxxxxxxxxxxxxxxx \
    --description "This is the DR snapshot copy"

Output:

{
    "SnapshotId": "snap-xxxxxxxxxxxxxxxxx"
}

Copy A Symbolic Link

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Here’s how to copy a symbolic link which is also known as a soft link from one directory to another. A regular copy command will not work. You will need to use the -P option to copy the symbolic link from one directory to another. If omitted, the symbolic links will not be copied.

cp -P /directory1/* /directory2/

How to create a symbolic link.

ln -s sourcefile myfile
ln -s /path/to/file myfile

Here are the man pages for ln and for cp.

SCP with a Key

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SCP is a secure copy utility in Linux. You’ll need access to your system. In this example, a pem key is used to authenticate to a host. SCP copies filename.ext to the home directory of ec2-user. It’s important to add the target directory, otherwise it will not work.

Here’s how to use SCP with a key from local to server.

scp -i key.pem filename.ext user@server:/home/user

From server to local. Run the command from local machine.

scp user@server:/home/user/file.txt /local/directory

Audacity Copy

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I was getting an error when launching Audacity.

The error was:

“The system has detected that another copy of Audacity is running.”

However, Audacity wasn’t running at all. Not one process. It turned out to be just a locked file located in /var/tmp/audacity-[your-username].

All you have to do is delete the entire directory and rerun Audacity.

rm -rf /var/tmp/audacity=[your-username]/

Once deleted, Audacity starts right up with no issues.

AWS S3 Sync Between Accounts

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Here’s how to sync S3 buckets between 2 different AWS accounts. Assuming buckets are already created.

  1. Setup bucket permissions in Account A
  2. Setup IAM user with permissions in Account B
  3. Setup bucket permissions in Account B
  4. Run S3 sync from Account B.

Account A bucket permissions. Account and user are from Account B.

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "DelegateS3Access",
            "Effect": "Allow",
            "Principal": {"AWS": "arn:aws:iam::222222222222:user/Jane"},
            "Action": ["s3:ListBucket","s3:GetObject"],
            "Resource": [
                "arn:aws:s3:::awsexamplesourcebucket/*",
                "arn:aws:s3:::awsexamplesourcebucket"
            ]
        }
    ]
}

Create IAM user (Jane) in Account B

aws iam create-user --user-name Jane

Give IAM user (Jane) access to both buckets.

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "s3:ListBucket",
                "s3:GetObject"
            ],
            "Resource": [
                "arn:aws:s3:::awsexamplesourcebucket",
                "arn:aws:s3:::awsexamplesourcebucket/*"
            ]
        },
        {
            "Effect": "Allow",
            "Action": [
                "s3:ListBucket",
                "s3:PutObject",
                "s3:PutObjectAcl"
            ],
            "Resource": [
                "arn:aws:s3:::awsexampledestinationbucket",
                "arn:aws:s3:::awsexampledestinationbucket/*"
            ]
        }
    ]
}

Sync the buckets

aws s3 sync s3://awsexamplesourcebucket s3://awsexampledestinationbucket

Subversion Branch

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Subversion Branch creates a new branch in the local working directory. In the example below, a copy of the project directory is forked and given a new name. The new branch will be treated as a separate branch.

svn copy http://repository/project/trunk \ 
         http://repository/project/branch/newbranch 
         \ -m "Place comments here."