Tag Archives: AWS

Configuring White-Label Name Servers with AWS Route53

Create a Route 53 reusable delegation set

aws route53 create-reusable-delegation-set --caller-reference ns-example-com


    "Location": "https://route53.amazonaws.com/2013-04-01/delegationset/N3PIG1YNLUZGKS",
    "DelegationSet": {
        "Id": "/delegationset/N3PIG1YNLUZGKS",
        "CallerReference": "ns-example-com",
        "NameServers": [

Note down the delegation set ID:


Get IP of delegated name servers

dig +short ns-30.awsdns-03.com
dig +short ns-1037.awsdns-01.org
dig +short ns-1693.awsdns-19.co.uk
dig +short ns-673.awsdns-20.net
dig AAAA +short ns-30.awsdns-03.com
dig AAAA +short ns-1037.awsdns-01.org
dig AAAA +short ns-1693.awsdns-19.co.uk
dig AAAA +short ns-673.awsdns-20.net

Then add these records with your domain registrar and in your current DNS providers. Set TTL to 60s.

Create new zone with white-label name servers

aws route53 create-hosted-zone --caller-reference example-tld --name example.tld --delegation-set-id /delegationset/N3PIG1YNLUZGKS


    "Location": "https://route53.amazonaws.com/2013-04-01/hostedzone/Z7RED47DZVVWP",
    "HostedZone": {
        "Id": "/hostedzone/Z7RED47DZVVWP",
        "Name": "example.tld.",
        "CallerReference": "example-tld",
        "Config": {
            "PrivateZone": false
        "ResourceRecordSetCount": 2
    "ChangeInfo": {
        "Id": "/change/C2IAGSQG1G1LCZ",
        "Status": "PENDING",
        "SubmittedAt": "2019-03-10T13:10:53.358Z"
    "DelegationSet": {
        "Id": "/delegationset/N3PIG1YNLUZGKS",
        "CallerReference": "ns-example-com",
        "NameServers": [

Update NS and SOA records

Prepare to change name servers, first lower TTL for the following records:

  • NS records: 172800 to 60 seconds
  • SOA record: 900 to 60 seconds

Install the AWS CLI with virtualenv on Gentoo

First download virtualenv:

wget -O virtualenv-15.0.3.tar.gz https://github.com/pypa/virtualenv/archive/15.0.3.tar.gz

Extract virtualenv:

tar xvf virtualenv-15.0.3.tar.gz

Create the environment:

python3 virtualenv-15.0.3/virtualenv.py --system-site-packages ~/awscli-ve/

Alternatively, you can use the -p option to specify a version of Python other than the default:

python3 virtualenv-15.0.3/virtualenv.py --system-site-packages -p /usr/bin/python3.4 ~/awscli-ve

Activate your new virtual environment:

source ~/awscli-ve/bin/activate

Install the AWS CLI into your virtual environment:

(awscli-ve)~$ pip install --upgrade awscli

To exit your virtualenv:


How can I get the size of an Amazon S3 bucket? – Server Fault

The AWS CLI now supports the –query parameter which takes a JMESPath expressions.

This means you can sum the size values given by list-objects using sum(Contents[].Size) and count like length(Contents[]).

This can be be run using the official AWS CLI as below and was introduced in Feb 2014

aws s3api list-objects --bucket BUCKETNAME --output json --query "[sum(Contents[].Size), length(Contents[])]"

Source: How can I get the size of an Amazon S3 bucket? – Server Fault

Use s3cmd to Download Requester Pays Buckets on S3

List files under pdf:

$ s3cmd ls --requester-pays s3://arxiv/pdf
                       DIR   s3://arxiv/pdf/

List files under pdf:

$ s3cmd ls --requester-pays s3://arxiv/pdf/\*
2010-07-29 19:56 526202880   s3://arxiv/pdf/arXiv_pdf_0001_001.tar
2010-07-29 20:08 138854400   s3://arxiv/pdf/arXiv_pdf_0001_002.tar
2010-07-29 20:14 525742080   s3://arxiv/pdf/arXiv_pdf_0002_001.tar
2010-07-29 20:33 156743680   s3://arxiv/pdf/arXiv_pdf_0002_002.tar
2010-07-29 20:38 525731840   s3://arxiv/pdf/arXiv_pdf_0003_001.tar
2010-07-29 20:52 187607040   s3://arxiv/pdf/arXiv_pdf_0003_002.tar
2010-07-29 20:58 525731840   s3://arxiv/pdf/arXiv_pdf_0004_001.tar
2010-07-29 21:11  44851200   s3://arxiv/pdf/arXiv_pdf_0004_002.tar
2010-07-29 21:14 526305280   s3://arxiv/pdf/arXiv_pdf_0005_001.tar
2010-07-29 21:27 234711040   s3://arxiv/pdf/arXiv_pdf_0005_002.tar

Get all files under pdf:

$ s3cmd get --requester-pays s3://arxiv/pdf/\*

List all content to text file:

$ s3cmd ls --requester-pays s3://arxiv/src/\* > all_files.txt

Calculate file size:

$ awk '{s += $3} END { print "sum is", s/1000000000, "GB, average is", s/NR }' all_files.txt
sum is 844.626 GB, average is 4.80447e+08

redhat – No ruby-devel in RHEL7? – Stack Overflow

This answer comes by way of piecing together bits from other answers – so to the previous contributors…thank you because I would not have figured this out.This example is based on the RHEL 7 AMI (Amazon Managed Image) 3.10.0-229.el7.x86_64.So by default as mentioned above the optional repository is not enabled. Don’t add another repo.d file as it already exists just that it is disabled.To enable first you need the name. I used grep to do this:grep -B1 -i optional /etc/yum.repos.d/*above each name will be the repo id enclosed in [ ] look for the optional not optional-sourceEnable the optional repo:yum-config-manager –enable Refresh the yum cache (not sure if this is necessary but it doesn’t hurt):sudo yum makecacheFinally, you can install ruby-devel:yum install ruby-develDepending on your user’s permissions you may need to use sudo.

Source: redhat – No ruby-devel in RHEL7? – Stack Overflow

Mount EBS Volumes To EC2 Linux Instances

View all available volumes:

$ lsblk
xvda    202:0    0   10G  0 disk 
├─xvda1 202:1    0    1M  0 part 
└─xvda2 202:2    0   10G  0 part /
xvdf    202:80   0  3.9T  0 disk 
$ file -s /dev/xvdf
/dev/xvdf: data

If returns data it means the volume is empty. We need to format it first:

$ mkfs -t ext4 /dev/xvdf
mke2fs 1.42.9 (28-Dec-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
262144000 inodes, 1048576000 blocks
52428800 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=3196059648
32000 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks: 
    32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 
    4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968, 
    102400000, 214990848, 512000000, 550731776, 644972544

Allocating group tables: done                            
Writing inode tables: done                            
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done       

Create a new directory and mount it to EBS volume:

$ cd / && mkdir ebs-data
$ mount /dev/xvdf /ebs-data/

Check volume mount:

$ df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/xvda2       10G  878M  9.2G   9% /
devtmpfs        476M     0  476M   0% /dev
tmpfs           496M     0  496M   0% /dev/shm
tmpfs           496M   13M  483M   3% /run
tmpfs           496M     0  496M   0% /sys/fs/cgroup
tmpfs           100M     0  100M   0% /run/user/1000
tmpfs           100M     0  100M   0% /run/user/0
/dev/xvdf       3.9T   89M  3.7T   1% /ebs-data

In order to make it mount automatically after each reboot, we need to edit /etc/fstab, first make a backup:

$ cp /etc/fstab /etc/fstab.orig

Find the UUID for the volume you need to mount:

$ ls -al /dev/disk/by-uuid/
total 0
drwxr-xr-x. 2 root root 80 Nov 25 05:04 .
drwxr-xr-x. 4 root root 80 Nov 25 04:40 ..
lrwxrwxrwx. 1 root root 11 Nov 25 04:40 de4dfe96-23df-4bb9-ad5e-08472e7d1866 -> ../../xvda2
lrwxrwxrwx. 1 root root 10 Nov 25 05:04 e54af798-14df-419d-aeb7-bd1b4d583886 -> ../../xvdf

Then edit /etc/fstab:

$ vi /etc/fstab


# /etc/fstab
# Created by anaconda on Tue Jul 11 15:57:39 2017
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
UUID=de4dfe96-23df-4bb9-ad5e-08472e7d1866 /                       xfs     defaults        0 0
UUID=e54af798-14df-419d-aeb7-bd1b4d583886 /ebs-data               ext4    defaults,nofail 0 2

Check if fstab has any error:

$ mount -a