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General installation

To install the WhaTap monitoring agent on a Go application in a Linux environment, follow these steps:

Tip

Before starting the installation, prepare the following information:

  • WhaTap project access key (check from [Project menu] > [Management] > [Agent installation])
  • WhaTap collection server IP address

Apply Go library​

The following are methods to add the WhaTap Go Library to the application to be monitored. Automatic instrumentation is recommended.

Library configuration methods

CategoryConfiguration methodDescriptionNote
Automatic instrumentationUsing whatap-go-instAutomatic code insertion with whatap-go-inst toolRecommended
Manual instrumentationDirect use of go-apiAdd API directly to codeWhen fine-grained control is needed

Automatically insert monitoring code into source code using the whatap-go-inst tool.

1. Install whatap-go-inst​

Go VersionInstallation method
Go 1.21+ (Recommended)Use go install
Go 1.18~1.20Download binary
  • Go 1.21+ (Recommended)
    go install github.com/whatap/go-api-inst/cmd/whatap-go-inst@latest

  • Go 1.18~1.20

    Download pre-built binaries.

    Linux x86_64:

    wget https://github.com/whatap/go-api-inst/releases/latest/download/whatap-go-inst_linux_amd64.tar.gz
    tar -xvzf whatap-go-inst_linux_amd64.tar.gz
    sudo mv whatap-go-inst /usr/local/bin/

Linux ARM64:

    wget https://github.com/whatap/go-api-inst/releases/latest/download/whatap-go-inst_linux_arm64.tar.gz
    tar -xvzf whatap-go-inst_linux_arm64.tar.gz
    sudo mv whatap-go-inst /usr/local/bin/

2. Initialize project and build​

Run the following commands in the project root directory where go.mod is located.

When installing for the first time

If you are installing whatap-go-inst for the first time, you need to set the PATH environment variable first.

# Add environment variable (only needed for first installation)
export PATH=$PATH:$(go env GOPATH)/bin

# Download and install go-api package
go get github.com/whatap/go-api@latest
go mod tidy

# Build (automatically insert monitoring code)
whatap-go-inst go build -o myapp .
Note

For detailed usage, see the Automatic instrumentation guide.

Manual instrumentation​

Download go-api directly and manually insert monitoring code into source code.

1. Download go-api​

go get github.com/whatap/go-api

2. Add monitoring code​

import "github.com/whatap/go-api/trace"

func main(){
    trace.Init(nil)
    defer trace.Shutdown()

    ctx, _ := trace.Start(context.Background(), "Start Tx")
    ...
    trace.End(ctx, err)
}
Note

For detailed API usage, see the Manual instrumentation guide.

Set monitoring environment variables​

Monitoring environment variables are configured in the whatap.conf file.

whatap.conf must be created in the working directory where the application runs.

Key settings​

Environment variableDescription
licenseProject access key
whatap.server.hostWhaTap collection server address
app_nameApplication name

whatap.conf location by execution method​

Execution methodWorking Directorywhatap.conf location
./myappCurrent directory./whatap.conf
/home/user/app/myapp/home/user/app/home/user/app/whatap.conf
Run with absolute path/ (root)Requires WHATAP_HOME setting

Configuration methods​

Basic execution​

echo "license={access key}" >> ./whatap.conf
echo "whatap.server.host={collection server IP address}" >> ./whatap.conf
echo "app_name={application name}" >> ./whatap.conf
./app

WHATAP_HOME environment variable setting​

mkdir ./whatap_home
echo "license={access key}" >> ./whatap_home/whatap.conf
echo "whatap.server.host={collection server IP address}" >> ./whatap_home/whatap.conf
echo "app_name={application name}" >> ./whatap_home/whatap.conf
WHATAP_HOME=./whatap_home ./app

Agent name setting per process​

For applications running with two or more processes, it is recommended to configure a separate whatap.conf file for each process.

# Application 1
mkdir ./whatap_home
echo "license={access key}" >> ./whatap_home/whatap.conf
echo "whatap.server.host={collection server IP address}" >> ./whatap_home/whatap.conf
echo "app_name={application name-1}" >> ./whatap_home/whatap.conf
WHATAP_HOME=./whatap_home ./app 

# Application 2
mkdir ./whatap_home1
echo "license={access key}" >> ./whatap_home1/whatap.conf
echo "whatap.server.host={collection server IP address}" >> ./whatap_home1/whatap.conf
echo "app_name={application name-2}" >> ./whatap_home1/whatap.conf
WHATAP_HOME=./whatap_home1 ./app
Note

app_name is a component for determining the agent name. For more information, see the following documentation.

Install data relay agent​

Once you have obtained the access key, download the agent using the following commands:

SH
## Register package repository
$ sudo rpm -Uvh https://repo.whatap.io/centos/5/noarch/whatap-repo-1.0-1.noarch.rpm

## Install package
$ sudo yum install whatap-agent

Start monitoring​

When you restart the application server, the agent starts collecting information.

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