Share folder from one container to another within ECS Fargate 1.4.0 - aws-fargate

Question

I have one Nginx and one WordPress(php-fpm) container declared in ECS Fargate task running on Platform 1.3.0 (or what is marked as LATEST).
I am trying to switch to Platform 1.4.0 for the support of EFS Volumes.
I want Nginx container to serve static assets directly from WordPress container. On 1.3.0 I just bind volumes between containers and everything works. The files from /var/www/html on WP container mapped to `/var/www/html/ on Nginx container.
[
{
"name": "wordpress",
"image": "....",
...
"mountPoints": [
{
"readOnly": false,
"sourceVolume": "asset-volume",
"containerPath": "/var/www/html"
}
]
},
{
"name": "nginx",
"image": "....",
...
"mountPoints": [
{
"sourceVolume": "asset-volume",
"containerPath": "/var/www/html",
"readOnly": true
}
]
}
]
volume {
name = "asset-volume"
host_path = null
}
However, on 1.4.0 instead of mapping folder from WordPress to Nginx, it seems like it creates an empty volume on host and maps that to /var/www/html on both containers thus removing all contents of /var/www/html on WordPress container.
I've been researching that issue for the last couple of days; one solution is to save code to /var/www/code and then copy it to /var/www/html on container runtime, but that seems like a very bad workaround. I wonder if anyone managed to share data from one container to another on Fargate 1.4.0 and how they achieved that.
Thank you

Answer 1

I had similar issue. Also found the conversation on this topic on Github:
https://github.com/aws/containers-roadmap/issues/863
tl;dr; Add VOLUME /var/www/html to you wordpress dockerfile, delete wordpress container definition mountPoints section and in nginx container definition replace mountPoints with volumesFrom.
like this:
"volumesFrom": [
{
"sourceContainer": "wordpress",
"readOnly": true
}
]

Answer 2

please follow this conversation on GitHub:
https://github.com/USACE/instrumentation/issues/88
Ensure dockerfiles for both wordpress and nginx each include the following directive:
VOLUME [ "/var/www/html" ]