Google cloud - Manage ip instance with gcloud

ip_instance.md

Google cloud - Manage ip instance with gcloud

Before you begin

Install & config

1. Install the gcloud command-line tool.
2. Set a default region and zone.

List items

$ gcloud projects list
> 
  PROJECT_ID         NAME               PROJECT_NUMBER
  data-collector-01  data collector 01  xxxxxxxxxx
  ...

$ gcloud compute instances list
>
  NAME           ZONE            MACHINE_TYPE   PREEMPTIBLE  INTERNAL_IP     EXTERNAL_IP     STATUS
  alexandria     europe-west1-d  n1-standard-2               10.240.x.x      xx.xxx.xxx.xx   TERMINATED
  ...

$ gcloud compute addresses list
>
  NAME           REGION        ADDRESS          STATUS
  alexandria     europe-west1  xx.xxx.xxx.xx    IN_USE

Assigning an external IP address to an existing instance

1. Check access-config instance

$ gcloud compute instances describe [INSTANCE_NAME]
> 
...
networkInterfaces:
- accessConfigs:
  - kind: compute#accessConfig
    name: External NAT
    natIP: 104.155.61.176
    type: ONE_TO_ONE_NAT
...

If natIP is present

• You have to dissociate this IP before assign a new IP (step 2.)

Else

• Your can assign an external IP (step 3.)

2. Dissociate IP

gcloud compute instances delete-access-config [INSTANCE_NAME] \
    --access-config-name [ACCESS_CONFIG_NAME]

• [INSTANCE_NAME] is the name of the instance.
• [ACCESS_CONFIG_NAME] is the access config to delete.

# Example :
gcloud compute instances delete-access-config my-instance \
    --access-config-name "External NAT"

3. Assign IP

gcloud compute instances add-access-config [INSTANCE_NAME] \
    --access-config-name [ACCESS_CONFIG_NAME] --address [IP_ADDRESS]

• [INSTANCE_NAME] is the name of the instance.
• [ACCESS_CONFIG_NAME] is access config to delete.
• [IP_ADDRESS] is the reserved IP address to add

# Example :
gcloud compute instances add-access-config my-instance \
    --access-config-name "External NAT" --address "104.155.61.176"

####for a random IP:

# Example :
gcloud compute instances add-access-config my-instance --zone=us-central1-a