Welkom bij het derde hoofdstuk van de serie gewijd aan de Oracle-cloudinfrastructuur en terraform. Als je de vorige hoofdstukken hebt gemist, kun je hier de links vinden:
- Terraform Oracle Cloud-provider instellen.
- Implementeer een Oracle Cloud-rekeninstantie met terraform
Nadat we met succes onze eerste instantie hebben gelanceerd, zijn we nu klaar voor een ingewikkelder voorbeeld.
Omgeving instellen
Verander in onze repository de directory en ga naar de instance-pool directory:
cd oracle-cloud-terraform-examples/instance-pool/
Wijzig het vars.tf-bestand op dezelfde manier als we het vars.tf-bestand hebben gewijzigd in het voorbeeld van een eenvoudige instantie (om het vars.tf-bestand helemaal opnieuw in te stellen, volgt u het gedeelte Variabelen instellen)
Extra variabelen
In dit voorbeeld hebben we wat extra variabelen:
| Variabele | Standaard | Beschrijving |
|---|---|---|
fault_domains | "FAULT-DOMAIN-1", "FAULT-DOMAIN-2", "FAULT-DOMAIN-3" | Deze variabele is een lijst met foutdomeinen waar onze instantiepool onze instanties zal implementeren |
instance_pool_size | 2 | Aantal instanties om te starten in de instantiepool |
Infrastructuuroverzicht
De infrastructuur is hetzelfde als het eenvoudige voorbeeld, maar we hebben ook:
- één netwerk load balancer, die het verkeer van internet naar onze instance pool instances leidt
- configuratie van één instantie gebruikt door de instantiepool
- pool van één instantie
- twee Oracle compute instances gelanceerd door de instance pool
De netwerk load balancer is gemaakt door:
- één luisteraar (poort 80)
- één back-set
- één ondersteund voor elk van de instanties in de instantiepool
Opmerkingen
Enkele belangrijke opmerkingen:
- Standaard is de firewall op de rekeninstanties uitgeschakeld. Bij sommige tests heeft de firewall problemen veroorzaakt
- Nginx wordt standaard geïnstalleerd (nginx wordt gebruikt voor het testen van de regels voor de beveiligingslijst en voor het testen van de netwerktaakverdeling)
- Het gebruikte besturingssysteem is Ubuntu 20.04
Implementeren
Maak nu het bestand terraform.tfvars (sectie Terraform-instellingen) en initialiseer 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.
we zijn nu klaar om onze infrastructuur in te zetten:
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.
als we geen fout uitvoeren:
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([])
},
])
Nu kunnen we sshen in een van de geïmplementeerde instanties:
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:~$
Na enkele minuten (ten minste één backend moet in de HEALTH-status zijn) zal ook de netwerkload balancer op onze verzoeken reageren:
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
...
...
...
Opruimen
Om onze infrastructuur op te ruimen/vernietigen:
terraform destroy