(2025.12.01 and earlier) Ubuntu 24.04 VDI bootstrap fails with DNS resolution error during DCV download

[Murielxun]

Bug description

Ubuntu 24.04 VDIs may get stuck in Creating state and eventually enter Error state. The bootstrap log shows the DNS resolution error wget: unable to resolve host address 'd1uj6qtbmh3dt5.cloudfront.net' when downloading the DCV server. This occurs when the AMI does not have the latest version of systemd installed.

Affected versions

2025.12.01 and earlier

Mitigation

The patch only applies to newly launched VDIs.

For 2025.06 and 2025.09:

1. Download patch.py and ubuntu2404_patch.patch for version 2025.06, 2025.06.01, or 2025.09 by replacing <output-directory> with the directory to download the patch script and patch file and <environment-name> with the name of your RES environment in the command below:
   1. The patch applies to RES 2025.06, 2025.06.01, or 2025.09

   1. The patch script requires AWS CLI v2, Python 3.9.16, and Boto3.
   2. Configure the AWS CLI for the account / region where RES is deployed, and make sure that you have S3 permissions to write to the bucket created by RES.

   3.  ENVIRONMENT_NAME=<environment-name>
       RES_VERSION=<res-version> # e.g. 2025.06, 2025.06.01, or 2025.09
       
       mkdir -p ${OUTPUT_DIRECTORY}
       curl https://research-engineering-studio-us-east-1.s3.amazonaws.com/releases/${RES_VERSION}/patch_scripts/patch.py --output ${OUTPUT_DIRECTORY}/patch.py
       curl https://research-engineering-studio-us-east-1.s3.amazonaws.com/releases/${RES_VERSION}/patch_scripts/patches/ubuntu2404_patch.patch --output ${OUTPUT_DIRECTORY}/ubuntu2404_patch.patch
      

2. Navigate to the directory where the patch script and patch file are downloaded. Run the following patch command:

   1. python3 ${OUTPUT_DIRECTORY}/patch.py --environment-name ${ENVIRONMENT_NAME} --res-version ${RES_VERSION} --module installation --patch ${OUTPUT_DIRECTORY}/ubuntu2404_patch.patch

3. Launch a new Ubuntu24.04 VDI with the fix.

For 2025.12 and 2026.03:

1. Create a S3 bucket with ACLs disabled.
2. Download patch_host.py and res-installation-scripts-*.tar.gz by replacing <output-directory> with the directory to download the patch script, <environment-name> with the name of your RES environment, <bucket-name> with the name of a ACLs disabled S3 bucket under the account/region where RES is deployed, RES_VERSION with 2025.12 or 2025.12.01, and <partition> with Classic or GovCloud in the command below:
   1. The patch applies to 2025.12 or 2025.12.01
   2. The patch script requires AWS CLI v2, Python 3.9.16 or above, and Boto3.
   3. Configure the AWS CLI for the account / region where RES is deployed, and make sure that you have S3 permissions to write to the bucket provided through .

   4.  ENVIRONMENT_NAME=<environment-name>
       RES_VERSION=<RES_VERSION>
       BUCKET_NAME=<bucket-name>
       PARTITION=<partition>
       
       mkdir -p ${OUTPUT_DIRECTORY}
       HASH=$(case $RES_VERSION in "2025.12.01") echo c3afeeb6;; "2025.12") echo 3f05fda1;; esac)
       curl https://research-engineering-studio-us-east-1.s3.us-east-1.amazonaws.com/releases/${RES_VERSION}/patch_scripts/patch_host.py --output ${OUTPUT_DIRECTORY}/patch_host.py
       curl https://research-engineering-studio-us-east-1.s3.us-east-1.amazonaws.com/releases/${RES_VERSION}/patch_scripts/patches/res-installation-scripts-${HASH}.tar.gz --output ${OUTPUT_DIRECTORY}/res-installation-scripts-${HASH}.tar.gz
      

3. Run the following patch command:
   1. python3 ${OUTPUT_DIRECTORY}/patch_host.py --environment-name ${ENVIRONMENT_NAME} --module installation --zip-file ${OUTPUT_DIRECTORY}/res-installation-scripts-${HASH}.tar.gz --s3-bucket ${BUCKET_NAME} --partition ${PARTITION}
4. Launch a new Ubuntu24.04 VDI with the fix.