Vítejte u třetí kapitoly série věnované cloudové infrastruktuře a terraformu Oracle, pokud jste nestihli předchozí kapitoly, zde najdete odkazy:
- Nastavte poskytovatele Terraform Oracle Cloud.
- Nasazení instance Oracle Cloud compute pomocí terraform
Poté, co jsme úspěšně spustili naši první instanci, jsme nyní připraveni na složitější příklad.
Nastavení prostředí
V našem úložišti změňte adresář a přejděte do adresáře fondu instancí:
cd oracle-cloud-terraform-examples/instance-pool/
Upravte vars.tf stejným způsobem, jakým jste upravili soubor vars.tf v jednoduchém příkladu instance (pro nastavení souboru vars.tf od začátku postupujte podle části Nastavení proměnných)
Další proměnné
V tomto příkladu máme nějaké další proměnné:
| Proměnná | Výchozí | Popis |
|---|---|---|
fault_domains | "FAULT-DOMAIN-1", "FAULT-DOMAIN-2", "FAULT-DOMAIN-3" | Tato proměnná je seznam chybových domén, do kterých bude náš fond instancí nasazovat naše instance |
instance_pool_size | 2 | Počet instancí ke spuštění ve fondu instancí |
Přehled infrastruktury
Infrastruktura je stejná jako u jednoduchého příkladu instance, ale máme také:
- jeden nástroj pro vyrovnávání zatížení sítě, který bude směrovat provoz z internetu do našich instancí fondu instancí
- jedna konfigurace instance používaná fondem instancí
- jednotlivý fond instancí
- dvě výpočetní instance Oracle spuštěné fondem instancí
Nástroj pro vyrovnávání zatížení sítě vytváří:
- jeden posluchač (port 80)
- jedna zálohovaná sada
- jedna zálohovaná pro každou z instancí ve fondu instancí
Poznámky
Několik důležitých poznámek:
- Ve výchozím nastavení je brána firewall na výpočetních instancích zakázána. Při některých testech firewall způsobil nějaké problémy
- Nginx bude nainstalován ve výchozím nastavení (nginx se používá pro testování pravidel seznamu zabezpečení a pro testování nastavení nástroje pro vyrovnávání zatížení sítě)
- Použitý operační systém je Ubuntu 20.04
Nasadit
Nyní vytvořte soubor terraform.tfvars (část nastavení Terraform) a inicializujte terraform:
terraform init
Initializing the backend...
Initializing provider plugins...
- Finding latest version of hashicorp/oci...
- Installing hashicorp/oci v4.50.0...
- Installed hashicorp/oci v4.50.0 (signed by HashiCorp)
Terraform has created a lock file .terraform.lock.hcl to record the provider
selections it made above. Include this file in your version control repository
so that Terraform can guarantee to make the same selections by default when
you run "terraform init" in the future.
Terraform has been successfully initialized!
You may now begin working with Terraform. Try running "terraform plan" to see
any changes that are required for your infrastructure. All Terraform commands
should now work.
If you ever set or change modules or backend configuration for Terraform,
rerun this command to reinitialize your working directory. If you forget, other
commands will detect it and remind you to do so if necessary.
nyní jsme připraveni nasadit naši infrastrukturu:
terraform plan
Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols:
+ create
Terraform will perform the following actions:
# oci_core_default_route_table.default_oci_core_default_route_table will be created
+ resource "oci_core_default_route_table" "default_oci_core_default_route_table" {
+ compartment_id = (known after apply)
+ defined_tags = (known after apply)
+ display_name = (known after apply)
+ freeform_tags = (known after apply)
+ id = (known after apply)
+ manage_default_resource_id = (known after apply)
+ state = (known after apply)
+ time_created = (known after apply)
+ route_rules {
+ cidr_block = (known after apply)
+ description = (known after apply)
+ destination = "0.0.0.0/0"
+ destination_type = "CIDR_BLOCK"
+ network_entity_id = (known after apply)
}
}
<TRUNCATED OUTPUT>
Plan: 14 to add, 0 to change, 0 to destroy.
Changes to Outputs:
+ instances_ips = [
+ (known after apply),
+ (known after apply),
]
+ lb_ip = (known after apply)
──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
Note: You didn't use the -out option to save this plan, so Terraform can't guarantee to take exactly these actions if you run "terraform apply" now.
pokud nemáme chybu, spusťte:
terraform apply
Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols:
+ create
<= read (data resources)
Terraform will perform the following actions:
# data.oci_core_instance.ubuntu_instance_pool_instances_ips[0] will be read during apply
# (config refers to values not yet known)
<= data "oci_core_instance" "ubuntu_instance_pool_instances_ips" {
+ agent_config = (known after apply)
+ async = (known after apply)
+ availability_config = (known after apply)
+ availability_domain = (known after apply)
+ boot_volume_id = (known after apply)
+ capacity_reservation_id = (known after apply)
+ compartment_id = (known after apply)
+ create_vnic_details = (known after apply)
+ dedicated_vm_host_id = (known after apply)
+ defined_tags = (known after apply)
+ display_name = (known after apply)
+ extended_metadata = (known after apply)
+ fault_domain = (known after apply)
+ freeform_tags = (known after apply)
+ hostname_label = (known after apply)
+ id = (known after apply)
+ image = (known after apply)
+ instance_id = (known after apply)
+ instance_options = (known after apply)
+ ipxe_script = (known after apply)
+ is_pv_encryption_in_transit_enabled = (known after apply)
+ launch_mode = (known after apply)
+ launch_options = (known after apply)
+ metadata = (known after apply)
+ platform_config = (known after apply)
+ preemptible_instance_config = (known after apply)
+ preserve_boot_volume = (known after apply)
+ private_ip = (known after apply)
+ public_ip = (known after apply)
+ region = (known after apply)
+ shape = (known after apply)
+ shape_config = (known after apply)
+ source_details = (known after apply)
+ state = (known after apply)
+ subnet_id = (known after apply)
+ system_tags = (known after apply)
+ time_created = (known after apply)
+ time_maintenance_reboot_due = (known after apply)
}
<TRUNCATED OUTPUT>
oci_network_load_balancer_listener.test_listener: Creation complete after 25s [id=networkLoadBalancers/ocid1.networkloadbalancer.oc1.eu-zurich-1.amaaaaaa5kjm7pyarkfapfnqqxrwaowlnmj5mnd3etmig5nfcwd3m5yb7uha/listeners/LB%20test%20listener]
oci_network_load_balancer_backend.test_backend[1]: Still creating... [31s elapsed]
oci_network_load_balancer_backend.test_backend[0]: Still creating... [31s elapsed]
oci_network_load_balancer_backend.test_backend[0]: Still creating... [41s elapsed]
oci_network_load_balancer_backend.test_backend[1]: Still creating... [41s elapsed]
oci_network_load_balancer_backend.test_backend[0]: Creation complete after 42s [id=networkLoadBalancers/ocid1.networkloadbalancer.oc1.eu-zurich-1.amaaaaaa5kjm7pyarkfapfnqqxrwaowlnmj5mnd3etmig5nfcwd3m5yb7uha/backendSets/Backend%20set%20test/backends/ocid1.instance.oc1.eu-zurich-1.an5heljr5kjm7pycu5exolhnubsq5isqo6nveddlmlsblkz7geb6vbwsvbtq.80]
oci_network_load_balancer_backend.test_backend[1]: Still creating... [51s elapsed]
oci_network_load_balancer_backend.test_backend[1]: Still creating... [1m1s elapsed]
oci_network_load_balancer_backend.test_backend[1]: Still creating... [1m11s elapsed]
oci_network_load_balancer_backend.test_backend[1]: Creation complete after 1m14s [id=networkLoadBalancers/ocid1.networkloadbalancer.oc1.eu-zurich-1.amaaaaaa5kjm7pyarkfapfnqqxrwaowlnmj5mnd3etmig5nfcwd3m5yb7uha/backendSets/Backend%20set%20test/backends/ocid1.instance.oc1.eu-zurich-1.an5heljr5kjm7pycft5ixge6ssknpyb5s6q3eihuccogpqrvv2ntqdlww72a.80]
Apply complete! Resources: 14 added, 0 changed, 0 destroyed.
Outputs:
instances_ips = [
"132.x.x.x",
"152.x.x.x",
]
lb_ip = tolist([
{
"ip_address" = "140.x.x.x"
"is_public" = true
"reserved_ip" = tolist([])
},
])
Nyní můžeme ssh v jedné z nasazených instancí:
ssh [email protected]
...
35 updates can be applied immediately.
25 of these updates are standard security updates.
To see these additional updates run: apt list --upgradable
The programs included with the Ubuntu system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.
Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
applicable law.
To run a command as administrator (user "root"), use "sudo <command>".
See "man sudo_root" for details.
ubuntu@inst-ikudx-ubuntu-instance-pool:~$
Po několika minutách (alespoň jeden backend musí být ve stavu HEALTH) odpoví na naše požadavky také nástroj pro vyrovnávání zatížení sítě:
curl -v 140.x.x.x
* Trying 140.x.x.x:80...
* TCP_NODELAY set
* Connected to 140.x.x.x (140.x.x.x) port 80 (#0)
> GET / HTTP/1.1
> Host: 140.x.x.x
> User-Agent: curl/7.68.0
> Accept: */*
>
* Mark bundle as not supporting multiuse
< HTTP/1.1 200 OK
< Server: nginx/1.18.0 (Ubuntu)
< Date: Wed, 27 Oct 2021 15:39:51 GMT
< Content-Type: text/html
< Content-Length: 672
< Last-Modified: Wed, 27 Oct 2021 15:33:26 GMT
< Connection: keep-alive
< ETag: "61797146-2a0"
< Accept-Ranges: bytes
...
...
...
Vyčištění
Chcete-li vyčistit/zničit naši infrastrukturu:
terraform destroy