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Merge pull request #2 from gitpod-io/nvn/improve-dcos
Improve the usage docs
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‎gitpod-network-check/README.md

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A CLI to check if your network setup is suitable for the installation of Gitpod.
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## How to use
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1. In order to perform a network check create a config filed called gitpod-network-check.yaml file that needs to be located in the same directory as the gitpod-network-check binary. Alternatively you can use the `--config` option to specify the config file. The config file needs to contain the region and the subnets that you want to use for your Gitpod installation.
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```yaml
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log-level: debug # Options: debug, info, warning, error
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region: eu-central-1
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main-subnets: subnet-0554e84f033a64c56, subnet-08584621e7754e505, subnet-094c6fd68aea493b7
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pod-subnets: subnet-028d11dce93b8eefc, subnet-04ec8257d95c434b7,subnet-00a83550ce709f39c
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```
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2. Get the AWS credentials of the account where you want to install Gitpod and set them as environment variables
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3. Run `gitpod-network-check diagnose`. The expected output should look similar to this.
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```
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INFO[0000] ✅ Main Subnets are valid
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INFO[0000] ✅ Pod Subnets are valid
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INFO[0000] ℹ️ Checking prerequisites
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INFO[0000] ✅ VPC endpoint com.amazonaws.eu-central-1.ec2messages is configured
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INFO[0000] ✅ VPC endpoint com.amazonaws.eu-central-1.ssm is configured
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INFO[0000] ✅ VPC endpoint com.amazonaws.eu-central-1.ssmmessages is configured
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INFO[0001] ℹ️ Launching EC2 instance in a Main subnet
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INFO[0007] ℹ️ Launching EC2 instance in a Pod subnet
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INFO[0009] ℹ️ Waiting for EC2 instances to become ready (can take up to 2 minutes)
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INFO[0167] ✅ EC2 Instances are now running successfully
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INFO[0167] ℹ️ Connecting to SSM...
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INFO[0175] ℹ️ Checking if the required AWS Services can be reached from the ec2 instances
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INFO[0178] ✅ Autoscaling is available
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INFO[0179] ✅ CloudFormation is available
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INFO[0179] ✅ CloudWatch is available
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INFO[0180] ✅ EC2 is available
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INFO[0181] ✅ EC2messages is available
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INFO[0182] ✅ ECR is available
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INFO[0183] ✅ ECR Api is available
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INFO[0184] ✅ EKS is available
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INFO[0185] ✅ Elastic LoadBalancing is available
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INFO[0185] ✅ KMS is available
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INFO[0186] ✅ Kinesis Firehose is available
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INFO[0187] ✅ SSM is available
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INFO[0188] ✅ SSMmessages is available
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INFO[0189] ✅ SecretsManager is available
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INFO[0190] ✅ Sts is available
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INFO[0190] ✅ DynamoDB is available
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INFO[0191] ✅ S3 is available
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```
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## Prerequisites
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1. Download the `gitpod-network-checker` binary using:
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```
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curl -L "https://github.com/gitpod-io/enterprise-deployment-toolkit/releases/download/v0.1.0/enterprise-deployment-toolkit_$(uname -s -m | awk '{print $1"_"$2}').tar.gz" | tar -xz
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```
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You can also download and untar the binary directly from the Github releases page [here](https://github.com/gitpod-io/enterprise-deployment-toolkit/releases/latest)
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Try running the command with help flag, to see if it downloaded properly:
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```
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./gitpod-network-checker --help
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```
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2. Set up AWS credentials
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`gitpod-network-checker` needs access to the AWS account you are planning to use to deploy Gitpod in. Much like AWS CLI, `gitpod-network-checker` uses the available AWS profile in your terminal to authenticate against the account. This means that you can rely on any locally available [AWS profiles](https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-files.html) or just set the right environment variables in your terminal for the CLI to use:
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```
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export AWS_ACCESS_KEY_ID=AKIAIOSFODNN7EXAMPLE
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export AWS_SECRET_ACCESS_KEY=wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY
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export AWS_SESSION_TOKEN=AQoDYXdzEJr...<remainder of security token>
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export AWS_REGION=eu-central-1 # Replace with the region you want to use
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```
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## Usage
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1. Preparation
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To run a diagnosis of the network that you want to use for Gitpod, the CLI command needs to know the subnets you have chosen to be used as the `Main` subnets and the `Pod` subnets. You can read more about the distinction here in [our docs](https://www.gitpod.io/docs/enterprise/getting-started/networking#2-subnet-separation). The CLI expects to read the IDs of these subnets in a configuration file. By default it tries to read it from a file name `gitpod-network-check.yaml` in your current directory, but you can override this behavior by using the `--config` flag of the CLI.
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For the sake of simplicity, let us create a file `gitpod-network-check.yaml` in the current directory and populate it with the subnet IDs and AWS region as shown below:
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```yaml
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log-level: debug # Options: debug, info, warning, error
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region: eu-central-1
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main-subnets: subnet-0554e84f033a64c56, subnet-08584621e7754e505, subnet-094c6fd68aea493b7
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pod-subnets: subnet-028d11dce93b8eefc, subnet-04ec8257d95c434b7,subnet-00a83550ce709f39c
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```
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2. Run the network diagnosis
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To start the diagnosis, the the command: `./gitpod-network-checker diagnose`
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```
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./gitpod-network-checker diagnose
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INFO[0000] ✅ Main Subnets are valid
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INFO[0000] ✅ Pod Subnets are valid
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INFO[0000] ℹ️ Checking prerequisites
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INFO[0000] ✅ VPC endpoint com.amazonaws.eu-central-1.ec2messages is configured
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INFO[0000] ✅ VPC endpoint com.amazonaws.eu-central-1.ssm is configured
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INFO[0000] ✅ VPC endpoint com.amazonaws.eu-central-1.ssmmessages is configured
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INFO[0001] ℹ️ Launching EC2 instance in a Main subnet
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INFO[0007] ℹ️ Launching EC2 instance in a Pod subnet
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INFO[0009] ℹ️ Waiting for EC2 instances to become ready (can take up to 2 minutes)
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INFO[0167] ✅ EC2 Instances are now running successfully
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INFO[0167] ℹ️ Connecting to SSM...
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INFO[0175] ℹ️ Checking if the required AWS Services can be reached from the ec2 instances
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INFO[0178] ✅ Autoscaling is available
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INFO[0179] ✅ CloudFormation is available
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INFO[0179] ✅ CloudWatch is available
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INFO[0180] ✅ EC2 is available
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INFO[0181] ✅ EC2messages is available
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INFO[0182] ✅ ECR is available
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INFO[0183] ✅ ECR Api is available
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INFO[0184] ✅ EKS is available
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INFO[0185] ✅ Elastic LoadBalancing is available
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INFO[0185] ✅ KMS is available
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INFO[0186] ✅ Kinesis Firehose is available
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INFO[0187] ✅ SSM is available
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INFO[0188] ✅ SSMmessages is available
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INFO[0189] ✅ SecretsManager is available
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INFO[0190] ✅ Sts is available
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INFO[0190] ✅ DynamoDB is available
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INFO[0191] ✅ S3 is available
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```
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‎gitpod-network-check/cmd/root.go

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networkCheckCmd.PersistentFlags().StringVar(&networkConfig.AwsRegion, "region", "eu-central-1", "AWS Region to create the cell in")
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networkCheckCmd.PersistentFlags().StringSliceVar(&networkConfig.MainSubnets, "main-subnets", []string{}, "List of main subnets")
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networkCheckCmd.PersistentFlags().StringSliceVar(&networkConfig.PodSubnets, "pod-subnets", []string{}, "List of pod subnets")
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networkCheckCmd.PersistentFlags().BoolVarP(&networkConfig.Destroy, "rm", "r", false, "Setting this will cleanup the stack at the end of diagnosis")
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networkCheckCmd.PersistentFlags().BoolVarP(&networkConfig.Cleanup, "cleanup", "c", false, "Cleanup an existing stack")
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bindFlags(networkCheckCmd, v)
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}
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