How to use golang to implement remote deployment

With the rapid development of cloud computing, big data and artificial intelligence, the way modern software is developed and deployed is also constantly changing. In order to deploy applications quickly and efficiently, many developers begin to use remote deployment to achieve automated deployment. This article will introduce how to use golang to achieve remote deployment.

1. What is remote deployment

Remote deployment refers to deploying the application on one or more servers, and after the source code or binary package is updated, the program code or The binary package is transferred to the target server and the application is updated, and the service is restarted.

The advantages of remote deployment are:

• You can update applications on multiple servers without having to log in one by one;
• You can control applications through the version control system Program release;
• can build an automated deployment process.

The core technology of remote deployment is the ssh protocol. SSH is a security protocol that can create encrypted channels to ensure the security of data interaction. Through the SSH protocol, operations such as remote login, file transfer, and remote command execution can be performed.

2. Use golang to achieve remote deployment

We can use golang language and ssh protocol to achieve remote deployment. The advantages of golang language are:

• Efficiency: the compilation speed of golang language is very fast, and the programs written are also very fast;
• Concurrency: golang language has built-in goroutine, which can be easily Easily implement concurrent operations;
• Readability: The syntax of golang language is concise, clear, and easy to read and maintain.

When using golang to implement remote deployment, we need to use golang's ssh library to implement operations such as remote login, file transfer, and remote command execution.

Remote login

To achieve remote login, we need the following code:

package main

import (
    "fmt"
    "golang.org/x/crypto/ssh"
)

func main() {
    config := &ssh.ClientConfig{
        User: "root",
        Auth: []ssh.AuthMethod{
            ssh.Password("your_password"),
        },

        HostKeyCallback: ssh.InsecureIgnoreHostKey(),
    }

    // Connect to the remote server and perform the SSH handshake.
    conn, err := ssh.Dial("tcp", "remote.server.com:22", config)
    if err != nil {
        panic("Failed to dial: " + err.Error())
    }
    defer conn.Close()

    fmt.Println("Connected to remote.server.com")
}

In the above code, we first define the configuration parameters of the ssh client, including user name, Password, target server IP address, port number, etc. Then we use the Dial method to connect to the target server and perform the ssh handshake protocol. After the handshake is successful, we can perform operations such as file transfer and remote command execution.

File transfer

Next, we will demonstrate how to use golang's ssh library for file transfer. We need the following code:

package main

import (
    "fmt"
    "golang.org/x/crypto/ssh"
    "io/ioutil"
)

func main() {
    config := &ssh.ClientConfig{
        User: "root",
        Auth: []ssh.AuthMethod{
            ssh.Password("your_password"),
        },
        HostKeyCallback: ssh.InsecureIgnoreHostKey(),
    }

    conn, err := ssh.Dial("tcp", "remote.server.com:22", config)
    if err != nil {
        panic("Failed to dial: " + err.Error())
    }
    defer conn.Close()

    client, err := sftp.NewClient(conn)
    if err != nil {
        panic("Failed to create sftp client: " + err.Error())
    }
    defer client.Close()

    file, err := ioutil.ReadFile("path/to/local/file")
    if err != nil {
        panic("Failed to read local file: " + err.Error())
    }

    sftpPath := "/path/to/remote/file"
    sftpFile, err := client.Create(sftpPath)
    if err != nil {
        panic("Failed to create remote file: " + err.Error())
    }
    defer sftpFile.Close()

    _, err = sftpFile.Write(file)
    if err != nil {
        panic("Failed to write remote file: " + err.Error())
    }

    fmt.Printf("File uploaded to %s\n", sftpPath)
}

In the above code, we use the sftp.NewClient method to create the sftp client and the Create method to create the remote file. Then read the local file into memory and use the Write method to write the file to the remote server.

Remote command execution

Finally, we will demonstrate how to use golang's ssh library to achieve remote command execution. We need the following code:

package main

import (
    "fmt"
    "golang.org/x/crypto/ssh"
)

func main() {
    config := &ssh.ClientConfig{
        User: "root",
        Auth: []ssh.AuthMethod{
            ssh.Password("your_password"),
        },
        HostKeyCallback: ssh.InsecureIgnoreHostKey(),
    }

    conn, err := ssh.Dial("tcp", "remote.server.com:22", config)
    if err != nil {
        panic("Failed to dial: " + err.Error())
    }
    defer conn.Close()

    session, err := conn.NewSession()
    if err != nil {
        panic("Failed to create session: " + err.Error())
    }
    defer session.Close()

    cmd := "sudo apt-get update && sudo apt-get upgrade -y"
    output, err := session.CombinedOutput(cmd)
    if err != nil {
        panic("Failed to execute command: " + err.Error())
    }

    fmt.Println(string(output))
}

In the above code, we use the ssh.Dial method to connect to the target server and use the conn.NewSession method to create a new remote session. We can then use the CombinedOutput method to execute the remote command and read the output of the command.

3. Summary

In this article, we introduced the method of using golang to achieve remote deployment, and gave example codes for remote login, file transfer and remote command execution. Using golang language can organize the remote deployment process well and automate the process of publishing applications, improving the efficiency and reliability of deployment.

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