Services or capabilities described in Amazon Web Services documentation might vary by Region. To see the differences applicable to the China Regions,
see Getting Started with Amazon Web Services in China
(PDF).
Code examples for Amazon EC2 using Amazon SDKs
The following code examples show how to use Amazon EC2 with an Amazon software development kit (SDK).
Actions are code excerpts from larger programs and must be run in context. While actions
show you how to call individual service functions, you can see actions in context in their related scenarios and
cross-service examples.
Scenarios are code examples that show you how to accomplish a specific task by
calling multiple functions within the same service.
For a complete list of Amazon SDK developer guides and code examples, see
Create Amazon EC2 resources using an Amazon SDK.
This topic also includes information about getting started and details about previous SDK versions.
Get started
The following code examples show how to get started using Amazon EC2.
- .NET
-
- Amazon SDK for .NET
-
namespace EC2Actions;
public class HelloEc2
{
/// <summary>
/// HelloEc2 lists the existing security groups for the default users.
/// </summary>
/// <param name="args">Command line arguments</param>
/// <returns>A Task object.</returns>
static async Task Main(string[] args)
{
// Set up dependency injection for Amazon Elastic Compute Cloud (Amazon EC2).
using var host = Microsoft.Extensions.Hosting.Host.CreateDefaultBuilder(args)
.ConfigureServices((_, services) =>
services.AddAWSService<IAmazonEC2>()
.AddTransient<EC2Wrapper>()
)
.Build();
// Now the client is available for injection.
var ec2Client = host.Services.GetRequiredService<IAmazonEC2>();
var request = new DescribeSecurityGroupsRequest
{
MaxResults = 10,
};
// Retrieve information about up to 10 Amazon EC2 security groups.
var response = await ec2Client.DescribeSecurityGroupsAsync(request);
// Now print the security groups returned by the call to
// DescribeSecurityGroupsAsync.
Console.WriteLine("Security Groups:");
response.SecurityGroups.ForEach(group =>
{
Console.WriteLine($"Security group: {group.GroupName} ID: {group.GroupId}");
});
}
}
- C++
-
- SDK for C++
-
Code for the CMakeLists.txt CMake file.
# Set the minimum required version of CMake for this project.
cmake_minimum_required(VERSION 3.13)
# Set the AWS service components used by this project.
set(SERVICE_COMPONENTS ec2)
# Set this project's name.
project("hello_ec2")
# Set the C++ standard to use to build this target.
# At least C++ 11 is required for the AWS SDK for C++.
set(CMAKE_CXX_STANDARD 11)
# Use the MSVC variable to determine if this is a Windows build.
set(WINDOWS_BUILD ${MSVC})
if (WINDOWS_BUILD) # Set the location where CMake can find the installed libraries for the AWS SDK.
string(REPLACE ";" "/aws-cpp-sdk-all;" SYSTEM_MODULE_PATH "${CMAKE_SYSTEM_PREFIX_PATH}/aws-cpp-sdk-all")
list(APPEND CMAKE_PREFIX_PATH ${SYSTEM_MODULE_PATH})
endif ()
# Find the AWS SDK for C++ package.
find_package(AWSSDK REQUIRED COMPONENTS ${SERVICE_COMPONENTS})
if (WINDOWS_BUILD AND AWSSDK_INSTALL_AS_SHARED_LIBS)
# Copy relevant AWS SDK for C++ libraries into the current binary directory for running and debugging.
# set(BIN_SUB_DIR "/Debug") # If you are building from the command line, you may need to uncomment this
# and set the proper subdirectory to the executables' location.
AWSSDK_CPY_DYN_LIBS(SERVICE_COMPONENTS "" ${CMAKE_CURRENT_BINARY_DIR}${BIN_SUB_DIR})
endif ()
add_executable(${PROJECT_NAME}
hello_ec2.cpp)
target_link_libraries(${PROJECT_NAME}
${AWSSDK_LINK_LIBRARIES})
Code for the hello_ec2.cpp source file.
#include <aws/core/Aws.h>
#include <aws/ec2/EC2Client.h>
#include <aws/ec2/model/DescribeInstancesRequest.h>
#include <iomanip>
#include <iostream>
/*
* A "Hello EC2" starter application which initializes an Amazon Elastic Compute Cloud (Amazon EC2) client and describes
* the Amazon EC2 instances.
*
* main function
*
* Usage: 'hello_ec2'
*
*/
int main(int argc, char **argv) {
Aws::SDKOptions options;
// Optionally change the log level for debugging.
// options.loggingOptions.logLevel = Utils::Logging::LogLevel::Debug;
Aws::InitAPI(options); // Should only be called once.
int result = 0;
{
Aws::Client::ClientConfiguration clientConfig;
// Optional: Set to the AWS Region (overrides config file).
// clientConfig.region = "us-east-1";
Aws::EC2::EC2Client ec2Client(clientConfig);
Aws::EC2::Model::DescribeInstancesRequest request;
bool header = false;
bool done = false;
while (!done) {
auto outcome = ec2Client.DescribeInstances(request);
if (outcome.IsSuccess()) {
if (!header) {
std::cout << std::left <<
std::setw(48) << "Name" <<
std::setw(20) << "ID" <<
std::setw(25) << "Ami" <<
std::setw(15) << "Type" <<
std::setw(15) << "State" <<
std::setw(15) << "Monitoring" << std::endl;
header = true;
}
const std::vector<Aws::EC2::Model::Reservation> &reservations =
outcome.GetResult().GetReservations();
for (const auto &reservation: reservations) {
const std::vector<Aws::EC2::Model::Instance> &instances =
reservation.GetInstances();
for (const auto &instance: instances) {
Aws::String instanceStateString =
Aws::EC2::Model::InstanceStateNameMapper::GetNameForInstanceStateName(
instance.GetState().GetName());
Aws::String typeString =
Aws::EC2::Model::InstanceTypeMapper::GetNameForInstanceType(
instance.GetInstanceType());
Aws::String monitorString =
Aws::EC2::Model::MonitoringStateMapper::GetNameForMonitoringState(
instance.GetMonitoring().GetState());
Aws::String name = "Unknown";
const std::vector<Aws::EC2::Model::Tag> &tags = instance.GetTags();
auto nameIter = std::find_if(tags.cbegin(), tags.cend(),
[](const Aws::EC2::Model::Tag &tag) {
return tag.GetKey() == "Name";
});
if (nameIter != tags.cend()) {
name = nameIter->GetValue();
}
std::cout <<
std::setw(48) << name <<
std::setw(20) << instance.GetInstanceId() <<
std::setw(25) << instance.GetImageId() <<
std::setw(15) << typeString <<
std::setw(15) << instanceStateString <<
std::setw(15) << monitorString << std::endl;
}
}
if (!outcome.GetResult().GetNextToken().empty()) {
request.SetNextToken(outcome.GetResult().GetNextToken());
} else {
done = true;
}
} else {
std::cerr << "Failed to describe EC2 instances:" <<
outcome.GetError().GetMessage() << std::endl;
result = 1;
break;
}
}
}
Aws::ShutdownAPI(options); // Should only be called once.
return result;
}
- Java
-
- SDK for Java 2.x
-
public static void describeSecurityGroups(Ec2Client ec2, String groupId) {
try {
DescribeSecurityGroupsRequest request = DescribeSecurityGroupsRequest.builder()
.groupIds(groupId)
.build();
// Use a paginator.
DescribeSecurityGroupsIterable listGroups = ec2.describeSecurityGroupsPaginator(request);
listGroups.stream()
.flatMap(r -> r.securityGroups().stream())
.forEach(group -> System.out
.println(" Group id: " +group.groupId() + " group name = " + group.groupName()));
} catch (Ec2Exception e) {
System.err.println(e.awsErrorDetails().errorMessage());
System.exit(1);
}
}
- JavaScript
-
- SDK for JavaScript (v3)
-
import { DescribeSecurityGroupsCommand } from "@aws-sdk/client-ec2";
import { client } from "./libs/client.js";
// Call DescribeSecurityGroups and display the result.
export const main = async () => {
try {
const { SecurityGroups } = await client.send(
new DescribeSecurityGroupsCommand({}),
);
const securityGroupList = SecurityGroups.slice(0, 9)
.map((sg) => ` • ${sg.GroupId}: ${sg.GroupName}`)
.join("\n");
console.log(
"Hello, Amazon EC2! Let's list up to 10 of your security groups:",
);
console.log(securityGroupList);
} catch (err) {
console.error(err);
}
};
- Kotlin
-
- SDK for Kotlin
-
suspend fun describeEC2SecurityGroups(groupId: String) {
val request =
DescribeSecurityGroupsRequest {
groupIds = listOf(groupId)
}
Ec2Client { region = "us-west-2" }.use { ec2 ->
val response = ec2.describeSecurityGroups(request)
response.securityGroups?.forEach { group ->
println("Found Security Group with id ${group.groupId}, vpc id ${group.vpcId} and description ${group.description}")
}
}
}
- Python
-
- SDK for Python (Boto3)
-
import boto3
def hello_ec2(ec2_resource):
"""
Use the AWS SDK for Python (Boto3) to create an Amazon Elastic Compute Cloud
(Amazon EC2) resource and list the security groups in your account.
This example uses the default settings specified in your shared credentials
and config files.
:param ec2_resource: A Boto3 EC2 ServiceResource object. This object is a high-level
resource that wraps the low-level EC2 service API.
"""
print("Hello, Amazon EC2! Let's list up to 10 of your security groups:")
for sg in ec2_resource.security_groups.limit(10):
print(f"\t{sg.id}: {sg.group_name}")
if __name__ == "__main__":
hello_ec2(boto3.resource("ec2"))
- Ruby
-
- SDK for Ruby
-
require 'aws-sdk-ec2'
require 'logger'
# EC2Manager is a class responsible for managing EC2 operations
# such as listing all EC2 instances in the current AWS account.
class EC2Manager
def initialize(client)
@client = client
@logger = Logger.new($stdout)
end
# Lists and prints all EC2 instances in the current AWS account.
def list_instances
@logger.info('Listing instances')
instances = fetch_instances
if instances.empty?
@logger.info('You have no instances')
else
print_instances(instances)
end
end
private
# Fetches all EC2 instances using pagination.
#
# @return [Array<Aws::EC2::Types::Instance>] List of EC2 instances.
def fetch_instances
paginator = @client.describe_instances
instances = []
paginator.each_page do |page|
page.reservations.each do |reservation|
reservation.instances.each do |instance|
instances << instance
end
end
end
instances
end
# Prints details of the given EC2 instances.
#
# @param instances [Array<Aws::EC2::Types::Instance>] List of EC2 instances to print.
def print_instances(instances)
instances.each do |instance|
@logger.info("Instance ID: #{instance.instance_id}")
@logger.info("Instance Type: #{instance.instance_type}")
@logger.info("Public IP: #{instance.public_ip_address}")
@logger.info("Public DNS Name: #{instance.public_dns_name}")
@logger.info("\n")
end
end
end
if $PROGRAM_NAME == __FILE__
ec2_client = Aws::EC2::Client.new(region: 'us-west-2')
manager = EC2Manager.new(ec2_client)
manager.list_instances
end