Issue
I have multiple docker_container
resources:
resource "docker_container" "headerdebug" {
name = "headerdebug"
image = "${docker_image.headerdebug.latest}"
labels {
"traefik.frontend.rule" = "Host:debug.in.bb8.fun"
"traefik.port" = 8080
"traefik.enable" = "true"
"traefik.frontend.passHostHeader" = "true"
"traefik.frontend.headers.SSLTemporaryRedirect" = "true"
"traefik.frontend.headers.STSSeconds" = "2592000"
"traefik.frontend.headers.STSIncludeSubdomains" = "false"
"traefik.frontend.headers.customResponseHeaders" = "${var.xpoweredby}"
"traefik.frontend.headers.customFrameOptionsValue" = "${var.xfo_allow}"
}
}
And another one:
resource "docker_container" "cadvisor" {
name = "cadvisor"
image = "${docker_image.cadvisor.latest}"
labels {
"traefik.frontend.rule" = "Host:cadvisor.bb8.fun"
"traefik.port" = 8080
"traefik.enable" = "true"
"traefik.frontend.headers.SSLTemporaryRedirect" = "true"
"traefik.frontend.headers.STSSeconds" = "2592000"
"traefik.frontend.headers.STSIncludeSubdomains" = "false"
"traefik.frontend.headers.contentTypeNosniff" = "true"
"traefik.frontend.headers.browserXSSFilter" = "true"
"traefik.frontend.headers.customFrameOptionsValue" = "${var.xfo_allow}"
"traefik.frontend.headers.customResponseHeaders" = "${var.xpoweredby}"
}
}
I'm trying to use locals
to re-use the common labels between both the containers. I have the following local defined:
locals {
traefik_common_labels {
"traefik.frontend.passHostHeader" = "true"
"traefik.frontend.headers.SSLTemporaryRedirect" = "true"
"traefik.frontend.headers.STSSeconds" = "2592000"
"traefik.frontend.headers.STSIncludeSubdomains" = "false"
"traefik.frontend.headers.customResponseHeaders" = "${var.xpoweredby}"
"traefik.frontend.headers.customFrameOptionsValue" = "${var.xfo_allow}"
}
}
But the documentation doesn't mention how to use locals for merging entire blocks, only maps.
I've tried the following:
labels "${merge(
local.traefik_common_labels,
map(
"traefik.frontend.rule", "Host:debug.in.bb8.fun",
"traefik.port", 8080,
"traefik.enable", "true",
)
)}"
which gives the following error:
tf11 plan
Error: Failed to load root config module: Error loading modules: module docker: Error parsing .terraform/modules/2f3785083ce0d0ac2dd3346cf129e795/main.tf: key 'labels "${merge(
local.traefik_common_labels,
map(
"traefik.frontend.rule", "Host:debug.in.bb8.fun",
"traefik.port", 8080,
"traefik.enable", "true",
)
)}"' expected start of object ('{') or assignment ('=')
There is a pretty diff of my attempts at this PR: https://git.captnemo.in/nemo/nebula/pulls/4/files
Solution
In Terraform 1.x+ you can use a dynamic
block to achieve this
variable "xpoweredby" { default = "" }
variable "xfo_allow" { default = "" }
locals {
traefik_common_labels = {
"traefik.frontend.passHostHeader" = "true"
"traefik.frontend.headers.SSLTemporaryRedirect" = "true"
"traefik.frontend.headers.STSSeconds" = "2592000"
"traefik.frontend.headers.STSIncludeSubdomains" = "false"
"traefik.frontend.headers.customResponseHeaders" = var.xpoweredby
"traefik.frontend.headers.customFrameOptionsValue" = var.xfo_allow
}
}
resource "docker_image" "cadvisor" {
name = "google/cadvisor:latest"
}
resource "docker_container" "cadvisor" {
name = "cadvisor"
image = docker_image.cadvisor.latest
dynamic "labels" {
for_each = merge(local.traefik_common_labels,
{
"traefik.frontend.rule" = "Host:debug.in.bb8.fun",
"traefik.port" = 8080,
"traefik.enable" = "true",
}
)
content {
label = labels.key
value = labels.value
}
}
}
In Terraform 0.11 etc, this could be accomplised with the following:
You need to assign the value to labels
like so
locals {
traefik_common_labels {
"traefik.frontend.passHostHeader" = "true"
"traefik.frontend.headers.SSLTemporaryRedirect" = "true"
"traefik.frontend.headers.STSSeconds" = "2592000"
"traefik.frontend.headers.STSIncludeSubdomains" = "false"
"traefik.frontend.headers.customResponseHeaders" = "${var.xpoweredby}"
"traefik.frontend.headers.customFrameOptionsValue" = "${var.xfo_allow}"
}
}
resource "docker_container" "cadvisor" {
name = "cadvisor"
image = "${docker_image.cadvisor.latest}"
labels = "${merge(
local.traefik_common_labels,
map(
"traefik.frontend.rule", "Host:debug.in.bb8.fun",
"traefik.port", 8080,
"traefik.enable", "true",
))}"
}
Answered By - Conor Mongey Answer Checked By - Robin (PHPFixing Admin)
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