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add api-paas-failwhale

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for use when we don't want API to serve any traffic, but paas is still
running. It's a simple nginx_buildpack app that is pushed separately,
and then two makefile commands that toggle the routes (and also
stop/start the nginx app).

For all endpoints/methods it returns a 503, with the response body.

```
{
    "status_code": 503,
    "errors": [
        {
            "error": "PlannedMaintenanceError",
            "message": "We’re performing some essential updates. Notify will be back shortly. Please check https://status.notifications.service.gov.uk/ for more details"
        }
    ]
}
```

NB: If you hit `/` it'll still return 404 - as this is defined in the
paas-proxy instance on aws.
This commit is contained in:
Leo Hemsted
2020-05-11 18:53:52 +01:00
parent 2f8947afde
commit 51511450a2
4 changed files with 93 additions and 0 deletions
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27
Makefile
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@@ -110,16 +110,19 @@ clean:
.PHONY: preview
preview: ## Set environment to preview
$(eval export DEPLOY_ENV=preview)
$(eval export DNS_NAME="notify.works")
@true
.PHONY: staging
staging: ## Set environment to staging
$(eval export DEPLOY_ENV=staging)
$(eval export DNS_NAME="staging-notify.works")
@true
.PHONY: production
production: ## Set environment to production
$(eval export DEPLOY_ENV=production)
$(eval export DNS_NAME="notifications.service.gov.uk")
@true
.PHONY: cf-login
@@ -176,3 +179,27 @@ cf-rollback: ## Rollbacks the app to the previous release
.PHONY: check-if-migrations-to-run
check-if-migrations-to-run:
@echo $(shell python3 scripts/check_if_new_migration.py)
.PHONY: cf-deploy-failwhale
cf-deploy-failwhale: #
$(if ${CF_SPACE},,$(error Must target space, eg `make preview cf-deploy-failwhale`))
cd ./paas-failwhale; cf push notify-api-failwhale -f manifest.yml
.PHONY: enable-failwhale
enable-failwhale: ## Enable the failwhale app and disable api
$(if ${DNS_NAME},,$(error Must target space, eg `make preview enable-failwhale`))
# make sure failwhale is running first
cf start notify-api-failwhale
cf map-route notify-api-failwhale ${DNS_NAME} --hostname api
cf unmap-route notify-api ${DNS_NAME} --hostname api
@echo "Failwhale is enabled"
.PHONY: disable-failwhale
disable-failwhale: ## Disable the failwhale app and enable api
$(if ${DNS_NAME},,$(error Must target space, eg `make preview disable-failwhale`))
cf map-route notify-api ${DNS_NAME} --hostname api
cf unmap-route notify-api-failwhale ${DNS_NAME} --hostname api
cf stop notify-api-failwhale
@echo "Failwhale is disabled"