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fix: use t3.large and add Buildx for visualizer EC2 #43

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Merged
gamaware merged 2 commits into from
Apr 14, 2026
Merged

fix: use t3.large and add Buildx for visualizer EC2 #43

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e39239a
fix: use t3.large for visualizer EC2 and update wait time estimate
gamaware Apr 14, 2026
9062d78
fix: add Buildx install to visualizer CloudFormation UserData
gamaware Apr 14, 2026
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3 changes: 2 additions & 1 deletion 10-databases/visualizer/LAB-VISUALIZER.md
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Original file line number Diff line number Diff line change
Expand Up @@ -90,7 +90,8 @@ In the AWS Console:

#### Step 4: Wait for the stack to complete

The stack takes about 3-5 minutes to create. Watch the progress in
The stack takes about 5-10 minutes to create (Docker pulls MySQL and
builds the visualizer image on first launch). Watch the progress in
the **Events** tab.

When complete, click the **Outputs** tab to find:
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13 changes: 11 additions & 2 deletions 10-databases/visualizer/cloudformation.yaml
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@@ -1,7 +1,7 @@
AWSTemplateFormatVersion: "2010-09-09"
Description: >
Lab 10 - Database Scalability Visualizer.
Launches a t3.medium EC2 instance with Docker and Docker Compose
Launches a t3.large EC2 instance with Docker and Docker Compose
pre-installed. Clones the course repository, runs the MySQL
primary-replica cluster and visualizer automatically. SSH and
visualizer web access enabled.
Expand Down Expand Up @@ -32,7 +32,7 @@ Resources:
LabInstance:
Type: AWS::EC2::Instance
Properties:
InstanceType: t3.medium
InstanceType: t3.large
ImageId: !Ref LatestAmiId
KeyName: vockey
SecurityGroupIds:
Expand Down Expand Up @@ -61,6 +61,15 @@ Resources:
-o /usr/local/lib/docker/cli-plugins/docker-compose
chmod +x /usr/local/lib/docker/cli-plugins/docker-compose

# Install Docker Buildx plugin (required by Compose for build)
if [ "${ARCH}" = "x86_64" ]; then BUILDX_ARCH="amd64"; else BUILDX_ARCH="arm64"; fi
BUILDX_VERSION=$(curl -fsSL https://api.github.com/repos/docker/buildx/releases/latest \
| grep '"tag_name"' | head -1 | cut -d'"' -f4)
curl -fsSL \
"https://github.com/docker/buildx/releases/download/${BUILDX_VERSION}/buildx-${BUILDX_VERSION}.linux-${BUILDX_ARCH}" \
-o /usr/local/lib/docker/cli-plugins/docker-buildx
chmod +x /usr/local/lib/docker/cli-plugins/docker-buildx

# Clone the repo and run the visualizer as ec2-user
su - ec2-user -c '
git clone https://github.com/gamaware/system-design-course.git
Expand Down
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