Bem-vindo ao terceiro capítulo da série dedicado à infraestrutura de nuvem e terraform da Oracle, se você perdeu os capítulos anteriores aqui você pode encontrar os links:
- Configure o provedor Terraform Oracle Cloud.
- Implante uma instância de computação do Oracle Cloud usando terraform
Depois de lançarmos com sucesso nossa primeira instância, estamos prontos para um exemplo mais complicado.
Configuração do ambiente
Em nosso repositório, altere o diretório e entre no diretório do pool de instâncias:
cd oracle-cloud-terraform-examples/instance-pool/
Modifique o vars.tf da mesma forma que modificou o arquivo vars.tf no exemplo de instância simples (para configurar o arquivo vars.tf do zero, siga a seção de configuração de variáveis)
Variáveis extras
Temos algumas variáveis extras neste exemplo:
| Variável | Padrão | Descrição |
|---|---|---|
fault_domains | "FAULT-DOMAIN-1", "FAULT-DOMAIN-2", "FAULT-DOMAIN-3" | Esta variável é uma lista de domínios de falha onde nosso pool de instâncias implantará nossas instâncias |
instance_pool_size | 2 | Número de instâncias a serem executadas no pool de instâncias |
Visão geral da infraestrutura
A infraestrutura é a mesma do exemplo de instância simples, mas também temos:
- um balanceador de carga de rede, que roteará o tráfego da Internet para nossas instâncias de pool de instâncias
- uma configuração de instância usada pelo pool de instâncias
- um pool de instâncias
- duas instâncias de computação Oracle iniciadas pelo pool de instâncias
O balanceador de carga de rede é feito por:
- um ouvinte (porta 80)
- um conjunto apoiado
- um com suporte para cada uma das instâncias no pool de instâncias
Observações
Algumas notas importantes:
- Por padrão, o firewall nas instâncias de computação está desabilitado. Em alguns testes o firewall criou alguns problemas
- O Nginx será instalado por padrão (o nginx é usado para testar as regras da lista de segurança e para testar a configuração do balanceador de carga de rede)
- O sistema operacional usado é o Ubuntu 20.04
Implantar
Agora crie o arquivo terraform.tfvars (seção de configuração do Terraform) e inicialize o 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.
agora estamos prontos para implantar nossa infraestrutura:
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.
se não tivermos erro, execute:
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([])
},
])
Agora podemos ssh em uma das instâncias implantadas:
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:~$
Após alguns minutos (pelo menos um back-end deve estar no estado HEALTH), o balanceador de carga de rede também responderá às nossas solicitações:
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
...
...
...
Limpeza
Para limpar/destruir nossa infraestrutura:
terraform destroy
