How to deploy Golang applications in offline environment

With the rapid development of cloud computing and container technology, Golang (Go), as an efficient, fast and easy-to-develop programming language, is becoming more and more popular in cloud native application development. At the same time, in many cases, deploying Golang applications to the cloud may be limited by uncontrollable factors such as network. At this time, offline deployment has become a common choice for Golang applications. This article will introduce how to deploy Golang applications in an offline environment using common methods.

1. Download Golang

First, we need to download the Golang binary file. Usually we can find the latest version of Golang on the official download page, and choose the version that is suitable for our own operating system and hardware platform to download. However, in situations where the network is poor or there is no Internet connection, we can use other methods to download Golang.

On Windows systems, we can use the following commands to download:

curl https://dl.google.com/go/go1.16.3.windows-amd64.zip -o go1.16.3.windows-amd64.zip

On Linux or MacOS, we can use the following commands to download:

curl https://dl.google.com/go/go1.16.3.linux-amd64.tar.gz -o go1.16.3.linux-amd64.tar.gz

These commands will Download the Golang installation package from the Google official website. If an error occurs during the download process, you can consider using other download methods. For example, download the Golang installation package locally from other reliable sources, and then transfer the installation package to an offline environment.

2. Install Golang

After downloading the Golang binary installation package, we can use the following command to install it on the local computer:

On Windows, unzip Move the last folder to C:\, as follows:

move go C:\

Then add the Golang bin directory in the system environment variable, for example:

set PATH=C:\go\bin;%PATH%

On Linux or MacOS, we can use the following Command to install Golang into the /usr/local/go directory:

tar -C /usr/local -xzf go1.16.3.linux-amd64.tar.gz

Then add the following statement in the .bashrc or .zshrc file:

export PATH=$PATH:/usr/local/go/bin

After the installation is complete, we can use the following command To verify whether Golang is installed correctly:

go version

3. Offline dependency package download

In Golang application development, we need to use various dependency packages, such as HTTP, database connection, etc. In offline deployment, we need to download these dependency packages locally for use in an offline environment.

Use the following command to obtain the dependency packages required for the application to run in an offline environment:

go mod download

The above command will download all required dependency packages locally. If we only need to download a specific package, we can use:

go get <package-name></package-name>

4. Offline compilation

After completing the acquisition of the Golang environment and dependent packages, we can compile the application in the offline environment. Before offline compilation, we need to move all the files and dependency packages required by the application to the offline environment.

In an offline environment, we can use the following command to compile the application:

go build -o <output-file> <input-file></input-file></output-file>

Among them, input-file is the entry file of the application, and output-file is the compiled file. The name of the executable file.

5. Offline deployment

Finally, we can deploy the compiled application in an offline environment. The specific deployment method can be selected according to the actual situation. For example:

In Linux, we can use systemd to run the application as a systemd service:

# /etc/systemd/system/<app-name>.service
[Unit]
Description=<app-description>
After=network.target

[Service]
User=root
WorkingDirectory=<app-dir>
ExecStart=<app-exec-file>

[Install]
WantedBy=default.target</app-exec-file></app-dir></app-description></app-name>

Then use the following command to start the service:

sudo systemctl start <app-name></app-name>

In Windows, We can run the application as a Windows service:

sc create <app-name> binpath=<app-exec-file> start=auto
sc start <app-name></app-name></app-exec-file></app-name>

6. Summary

Golang is an efficient, fast and easy-to-develop programming language that has been widely used in cloud native application development Applications. In some restricted network situations, offline deployment has become a common choice for Golang applications. This article introduces how to download Golang, obtain offline dependency packages, compile applications, and deploy offline. I hope it will be helpful to readers.

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