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Request consul in prestart hook #278

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merged 1 commit into from
Oct 4, 2024
Merged

Request consul in prestart hook #278

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115 changes: 86 additions & 29 deletions jobs/fastcgi.nomad
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Original file line number Diff line number Diff line change
Expand Up @@ -22,44 +22,101 @@ job "fastcgi" {
datacenters = ["dc1"]

group "fastcgi" {

# Init Task Lifecycle
# Reference: https://www.nomadproject.io/docs/job-specification/lifecycle#init-task-pattern
task "wait-for-mysql" {
lifecycle {
hook = "prestart"
sidecar = false
dynamic "task" {
for_each = local.main ? [{}] : []
labels = ["wait-for-mysql"]
content {
lifecycle {
hook = "prestart"
sidecar = false
}

driver = "exec"
config {
command = "sh"
args = [
"-c",
"while ! ncat --send-only 127.0.0.1 3306 < /dev/null; do sleep 1; done",
]
}
}
}
# Inter-job dependencies with init tasks
# https://developer.hashicorp.com/nomad/tutorials/task-deps/task-dependencies-interjob
dynamic "task" {
for_each = var.test ? [{}] : []
labels = ["await-mysql"]
content {
lifecycle {
hook = "prestart"
sidecar = false
}

driver = "exec"
config {
command = "sh"
args = [
"-c",
format(
"while ! ncat --send-only %s %s < /dev/null; do sleep 1; done",
local.main ? "127.0.0.1" : NOMAD_UPSTREAM_IP_mysql,
local.main ? "3306" : NOMAD_UPSTREAM_PORT_mysql
),
]
driver = "docker"
config {
image = "busybox:1.28"
command = "sh"
network_mode = "host"
args = [
"-c",
true ? "echo -n 'Waiting for service'; until nc -z ${var.main_nomad_addr} 3306 < /dev/null; do echo '.'; sleep 2; done"
: "echo -n 'Waiting for service'; until nslookup mysql.service.consul 127.0.0.1:8600 2>&1 >/dev/null; do echo '.'; sleep 2; done",
]
}

resources {
cpu = 100
memory = 100
}
}
}

task "wait-for-memcached" {
lifecycle {
hook = "prestart"
sidecar = false
dynamic "task" {
for_each = local.main ? [{}] : []
labels = ["wait-for-memcached"]
content {
lifecycle {
hook = "prestart"
sidecar = false
}

driver = "exec"
config {
command = "sh"
args = [
"-c",
"while ! ncat --send-only 127.0.0.1 11211 < /dev/null; do sleep 1; done",
]
}
}
}
dynamic "task" {
for_each = var.test ? [{}] : []
labels = ["await-memcached"]
content {
lifecycle {
hook = "prestart"
sidecar = false
}

driver = "exec"
config {
command = "sh"
args = [
"-c",
format("while ! ncat --send-only %s %s < /dev/null; do sleep 1; done",
local.main ? "127.0.0.1" : NOMAD_UPSTREAM_IP_memcached,
local.main ? "11211" : NOMAD_UPSTREAM_PORT_memcached
),
]
driver = "docker"
config {
image = "busybox:1.28"
command = "sh"
network_mode = "host"
args = [
"-c",
"echo -n 'Waiting for service'; until nslookup memcached.service.consul 127.0.0.1:8600 2>&1 >/dev/null; do echo '.'; sleep 2; done",
]
}

resources {
cpu = 100
memory = 100
}
}
}

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