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Use Bash to wait for Docker container to start by tag

If you run a container in the background and want to wait until it has started up before doing anything else, you can use a combination of docker ps and docker inspect to check within a Bash loop whether it is finally running. This can be useful if you want to run tests checking if the container is responding on a specific port for example. You can remove the --all option for docker ps and the...

Prevent more than 1 CircleCI tag workflow from running concurrently

If you are using CircleCI for tag-based deployments, you may want to prevent more than 1 deployment happening at once. This code snippet allows you to check within a pipeline whether another pipeline triggered by a Git tag using the same workflow is currently running. Because the list of pipelines does not show you which workflow they are using, we are assuming that there is only a single tag...

Ignore Consul Connect container logs in Filebeat on kubernetes

Consul Connect is a great service mesh, but the log output can be very noisy. Using sidecar injection via annotations will cause Envoy proxy and Consul lifecycle containers (consul-connect-envoy-sidecar and consul-connect-lifecycle-sidecar respectively) to be injected into your Pods, meaning that Filebeat will parse their output in stdout the same as your application container. Currently log...

SSH into private GKE nodes using Cloud IAP

If you have created private Google Kubernetes Engine clusters for security reasons, you may still need to SSH into the nodes from time-to-time. Luckily Google Cloud provides Identity-Aware-Proxy tunnelling via gcloud so you do not need a VPN connection to the VPC the cluster resides within. However in order for this to work you will need to create a firewall rule that targets your GKE nodes using...

Convert URL to slug in helm chart template

If you are supplying a domain or URI/URL to a Kubernetes manifest in a Helm chart template, you may need to convert the value to remove the dots/periods since most Kubernetes resources will not allow them.

You can use the Helm template function replace and a pipeline to convert values where necessary.

Access GCR Docker images from other Google Cloud Projects using Terraform

If you have multiple Google Cloud Projects and want to pull Container Registry images from other projects, you will need to grant each project access by adding a role to the a few service accounts specific to each Project. For Kubernetes Engine or Compute Engine you will need to add the role to the Compute Engine default service accountFor Cloud Build you will need to add the role to the Cloud...

Access Compute Engine VM images from other Google Cloud Projects using Terraform

If you have multiple Google Cloud Projects and want to access your GCE VM images from a single project, you will need to grant each project access by adding a role to the Google APIs service account specific to each Project. Confusingly this requires the use of the Project ID as opposed to the Project Name. Note that using google_project_iam_member in Terraform will simply add that role to the...