Update leader election failed. error="context deadline exceeded": Deployment Using the ArangoDB Starter in Docker

[yehyaumar]

My Environment

• ArangoDB Version: 3.12.0.2
• Deployment Mode: Cluster
• Deployment Strategy: ArangoDB Starter in Docker
• Configuration:
• Infrastructure: AWS
• Operating System: Ubuntu 20.04
• Total RAM in your machine: 8GB
• Disks in use:
• Used Package: Docker - official Docker library

Component, Query & Data

Affected feature: Using the ArangoDB Starter in Docker

Steps to reproduce

1. Created 3 AWS EC2 t2.micro instances
2. Followed the steps from here: Deployment Using the ArangoDB Starter inDocker
3. Using security group, I'm allowing Inbound rules Custom TCP for 8528, 8529, 8530 and 8531 ports

Problem:
"Added new peer" log appears properly after joining from other instances but after some time it fails with following error "Update leader election failed. error="context deadline exceeded""

There are the cmds I'm executing on each instance:

On instanse A:

export IP=172.31.##.#5
docker volume create arangodb1
docker run -it --name=adb1 --rm -p 8528:8528 \
    -v arangodb1:/data \
    -v /var/run/docker.sock:/var/run/docker.sock \
    arangodb/arangodb-starter \
    --starter.address=$IP

On Instance B:

export IP=172.31.##.#4
docker volume create arangodb2
docker run -it --name=adb2 --rm -p 8528:8528 \
    -v arangodb2:/data \
    -v /var/run/docker.sock:/var/run/docker.sock \
    arangodb/arangodb-starter \
    --starter.address=$IP \
    --starter.join 172.31.##.#5

On Instance C:

export IP=172.31.##.##2
docker volume create arangodb3
docker run -it --name=adb3 --rm -p 8528:8528 \
    -v arangodb3:/data \
    -v /var/run/docker.sock:/var/run/docker.sock \
    arangodb/arangodb-starter \
    --starter.address=$IP \
    --starter.join 172.31.##.#5

Note: # in IP address pertains to a number.

Expected result:

The cluster should work without problems