Creating and managing GCP Services and containers
For an end-to-end example of creating an GKE Service, see this tutorial.
In the DuploCloud Portal, navigate to Kubernetes -> Services.
Click Add. The Basic Options section of the Add Service page displays.
In the Service Name field, give the Service a name (without spaces).
From the Cloud list box, select Google.
From the Platform list box, select GKE Linux.
In the Docker Image field, enter the Docker image.
Optionally, enter any allocation tags in the Allocation Tag field.
From the Replica Strategy list box, select a replication strategy. Refer to the informational ToolTip ( ) for more information.
Specify the number of replicas in the Replicas field (for Static replica strategy). The number of replicas you define must be less than or equal to the number of Hosts in the fleet.
In the Replica Placement list box (for Static or Horizontal Pod Autoscaler replication strategies) select First Available, Place on Different Hosts, Spread Across Zones, or Different Hosts and Spread Across Zones. Refer to the informational ToolTip ( ) for more information.
Optionally, enter variables in the Environmental Variables field.
In the Force StatefulSets list box, select Yes or No (for Static or Horizontal Pod Autoscaler replication strategies).
Optionally, select Tolerate spot instances (for Static or Horizontal Pod Autoscaler replication strategies)
Click Next. The Add Service, Advanced Options page displays.
Configure advanced options as needed. For example, you can implement Kubernetes Lifecycle Hooks in the Other Container Config field (optional).
Click Create. The Service is created.
From the DuploCloud Portal, navigate to Kubernetes -> Services. Select the Service from the NAME column. The Service details page displays.
Using the Services page, you can start, stop, and restart multiple services simultaneously.
In the DuploCloud Portal, navigate to Kubernetes -> Services.
Use the checkbox column to select multiple services you want to start or stop at once.
From the Service Actions menu, select Start Service, Stop Service, or Restart Service. The selected Services are started, stopped, or restarted as you specified.
In the DuploCloud Portal, you can display and manage the containers you have defined.
Select the Tenant from the Tenant list box in the upper left.
Navigate to Kubernetes -> Containers.
Logs
Displays container logs.
State
Displays container state configuration, in YAML code, in a separate window.
Container Shell
Host Shell
Accesses the Host Shell.
Delete
Deletes the container.
Configuration and Secret management in GCP
There are many ways to pass configurations to containers at run-time. Although simple to set up, using Environmental Variables can become complex if there are too many configurations, especially files and certificates.
Using Kubernetes, you can populate environment variables using .
Select the Options Menu ( ) in each container row to display Logs, State, Container Shell, Host Shell, and Delete options.
Accesses the Container Shell. To access the Container Shell option, you must first set up .
Pin a container to a set of hosts using allocation tagging
In DuploCloud, allocation tags give you control over where containers and Services are deployed within a Kubernetes cluster. By default, DuploCloud spreads container replicas across available Hosts to balance resource usage. Allocation tags allow you to label Hosts and Services with specific characteristics, capabilities, or preferences, and to "pin" Services to certain Hosts to meet your operational and resource needs. Allocation tags are useful for deployment requirements like using Hosts with specialized resources, meeting compliance standards, or isolating workloads.
For a Service to run on a specific Host, the Host and the Service must have matching allocation tags. Services without allocation tags are deployed on any available Host in the Kubernetes cluster.
Assign a tag describing the Host's characteristics or capabilities, such as resource capacity, geographic location, or compliance needs.
In the DuploCloud Portal, navigate to Cloud Services -> Hosts. The Hosts page displays.
Select the Host from the NAME column. If the Host is part of an Auto-Scaling Group (ASG), select the ASG tab and select the correct ASG.
Click the Allocation Tag Edit Icon ( ). The Set Allocation Tag pane displays.
In the Allocation Tag field, enter a tag name. Use only alphanumeric characters. Hyphens ( - ) are supported as special characters if needed. For example, highmemory-highcpu is a valid tag name.
Click Set. The allocation tag you set displays in the heading banner for the Host or ASG.
In the DuploCloud Portal, navigate to the Add Service or Edit Service page, and enter a tag name in the Allocation Tag field. When the Service runs, DuploCloud will attempt to select a Host with a matching allocation tag. To pin the Service to run on a specific Host, apply matching allocation tags to the Host and Service.
On the Host or ASG page, select the Metadata tab, and edit or delete the existing allocation tag.
Roll back a container image for Kubernetes or Docker Services
Container Rollback in DuploCloud allows users to quickly revert a Kubernetes or Docker Service's container image to a previous, stable version. This is especially useful in scenarios where a newly deployed container image introduces issues, errors, or failures in the application. With this feature, users can ensure minimal downtime and maintain the stability of their Services by rolling back to a known good state. Container rollback is support for:
Kubernetes (on EKS, AKS, GKE, and DuploCloud Kubernetes)
Docker Services (on ECS)
To roll back a container image in DuploCloud for your GKE Service, first configure system settings to enable container history tracking, and then roll back the container image:
Navigate to Admin -> System Settings.
Select the System Config tab and click Add to create a new configuration.
For Config Type, select Flags.
In the Flag Name field, choose Enable Container Image History Tracking.
Set the Value to True and click Submit.
Select the appropriate Tenant from the Tenant list box.
Navigate to Kubernetes -> Services or Docker -> Services.
In the NAME column, select the service you want to roll back.
From the Actions menu, choose Rollback. The Rollback Container Image pane will appear.
In the Image list box, select the version of the container image you want to roll back to.
Click Rollback to revert the service to the selected image.
Set Docker registry credentials and Kubernetes secrets
In the DuploCloud Portal, navigate to Docker -> Services. Docker registry credentials are passed to the Kubernetes cluster as kubernetes.io/dockerconfigjson.
Click the Docker list box in the upper right, and select Docker Credentials. The Set Docker registry Creds pane displays.
Supply the credentials and click Submit.
Enable the Docker Shell Service by clicking Enable Docker Shell.
You can pull images from multiple Docker registries by adding multiple Docker Registry Credentials.
In the DuploCloud Portal, click Administrator -> Plan. The Plans page displays.
Select the Plan in the Name column.
Click the Config tab.
Click Add. The Add Config pane displays.
You can pass Docker Credentials using the Environment Variables config field in the Add Service Basic Options page. See the Kubernetes Configs and Secrets section.
