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Blog/blog.nomad.hcl
Caleb Braaten 23fc8df0f4
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Include Traefik Tags for Canary Allocations
2026-09-17 03:49:07 -07:00

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2.6 KiB
HCL

# export to json for ci/cd scripts with the following command
# nomad job run -output blog.nomad.hcl > blog.nomad.json
locals {
HOST = "cbraaten.dev"
# shared by both production and canary allocations so Traefik never
# loses sight of the router during a rolling switchover
traefik_tags = [
# ----- router for the naked domain -----
"traefik.enable=true",
"traefik.http.routers.blog.rule=Host(`${local.HOST}`)",
"traefik.http.routers.blog.entrypoints=websecure",
"traefik.http.routers.blog.tls=true",
"traefik.http.routers.blog.service=blog-svc",
# ----- router for the www domain -----
"traefik.http.routers.blog-www.rule=Host(`www.${local.HOST}`)",
"traefik.http.routers.blog-www.entrypoints=websecure",
"traefik.http.routers.blog-www.tls=true",
"traefik.http.routers.blog-www.middlewares=redirect-www-to-root",
# ----- middleware that does the 301 redirect -----
"traefik.http.middlewares.redirect-www-to-root.redirectregex.regex=^https?://www\\.${local.HOST}(.*)",
"traefik.http.middlewares.redirect-www-to-root.redirectregex.replacement=https://${local.HOST}$${1}",
"traefik.http.middlewares.redirect-www-to-root.redirectregex.permanent=true",
# ----- service and health check -----
"traefik.http.services.blog-svc.loadbalancer.healthcheck.path=/healthz",
"traefik.http.services.blog-svc.loadbalancer.healthcheck.interval=5s",
"traefik.http.services.blog-svc.loadbalancer.healthcheck.timeout=2s",
"traefik.http.services.blog-svc.loadbalancer.healthcheck.hostname=${local.HOST}",
]
}
variable "image_tag" {
type = string
default = "latest"
}
job "blog" {
type = "service"
group "blog" {
count = 1
# let Consul/Traefik deregister the old allocation before it exits,
# so no requests are routed to it during a rolling switchover
shutdown_delay = "10s"
network {
port "http" {
to = 3000
}
}
service {
name = "blog"
provider = "consul"
port = "http"
tags = local.traefik_tags
canary_tags = local.traefik_tags
check {
name = "blog-health"
type = "http"
path = "/healthz"
interval = "10s"
timeout = "2s"
}
}
task "blog" {
driver = "docker"
config {
image = "git.cbraaten.dev/caleb/blog:${var.image_tag}"
ports = ["http"]
}
}
update {
max_parallel = 1
health_check = "checks"
min_healthy_time = "10s"
healthy_deadline = "3m"
canary = 1
auto_promote = true
auto_revert = true
}
}
}