Work with security groups - Amazon Elastic Compute Cloud
Create a security groupCopy a security groupView your security groupsAdd rules to a security groupUpdate security group rulesDelete rules from a security groupDelete a security groupAssign a security group to an instanceChange an instance's security group
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Work with security groups

You can assign a security group to an instance when you launch the instance. When you add or remove rules, those changes are automatically applied to all instances to which you've assigned the security group. For more information, see Assign a security group to an instance.

After you launch an instance, you can change its security groups. For more information, see Change an instance's security group.

You can create, view, update, and delete security groups and security group rules using the Amazon EC2 console and the command line tools.

Create a security group

Although you can use the default security group for your instances, you might want to create your own groups to reflect the different roles that instances play in your system.

By default, new security groups start with only an outbound rule that allows all traffic to leave the instances. You must add rules to enable any inbound traffic or to restrict the outbound traffic.

A security group can be used only in the VPC for which it is created.

Console
To create a security group

  1. Open the Amazon EC2 console at https://console.amazonaws.cn/ec2/.

  2. In the navigation pane, choose Security Groups.

  3. Choose Create security group.

  4. In the Basic details section, do the following.

    1. Enter a descriptive name and brief description for the security group. They can't be edited after the security group is created. The name and description can be up to 255 characters long. The valid characters are a-z, A-Z, 0-9, spaces, and ._-:/()#,@[]+=&;{}!$*.

    2. For VPC, choose the VPC.

  5. You can add security group rules now, or you can add them later. For more information, see Add rules to a security group.

  6. You can add tags now, or you can add them later. To add a tag, choose Add new tag and enter the tag key and value.

  7. Choose Create security group.

Command line
To create a security group

Use one of the following commands:

Copy a security group

You can create a new security group by creating a copy of an existing one. When you copy a security group, the copy is created with the same inbound and outbound rules as the original security group. If the original security group is in a VPC, the copy is created in the same VPC unless you specify a different one.

The copy receives a new unique security group ID and you must give it a name. You can also add a description.

You can't copy a security group from one Region to another Region.

You can create a copy of a security group using the Amazon EC2 console.

To copy a security group

  1. Open the Amazon EC2 console at https://console.amazonaws.cn/ec2/.

  2. In the navigation pane, choose Security Groups.

  3. Select the security group to copy and choose Actions, Copy to new security group.

  4. Specify a name and optional description, and change the VPC and security group rules if needed.

  5. Choose Create.

View your security groups

You can view information about your security groups using one of the following methods.

Console
To view your security groups

  1. Open the Amazon EC2 console at https://console.amazonaws.cn/ec2/.

  2. In the navigation pane, choose Security Groups.

  3. Your security groups are listed. To view the details for a specific security group, including its inbound and outbound rules, choose its ID in the Security group ID column.

Command line
To view your security groups

Use one of the following commands.

Amazon EC2 Global View

You can use Amazon EC2 Global View to view your security groups across all Regions for which your Amazon account is enabled. For more information, see List and filter resources across Regions using Amazon EC2 Global View.

Add rules to a security group

When you add a rule to a security group, the new rule is automatically applied to any instances that are associated with the security group. There might be a short delay before the rule is applied. For more information, see Security group rules for different use cases and Security group rules.

Console
To add an inbound rule to a security group

  1. Open the Amazon EC2 console at https://console.amazonaws.cn/ec2/.

  2. In the navigation pane, choose Security Groups.

  3. Select the security group, and choose Actions, Edit inbound rules.

  4. For each rule, choose Add rule and do the following.

    1. For Type, choose the type of protocol to allow.

      • For custom TCP or UDP, you must enter the port range to allow.

      • For custom ICMP, you must choose the ICMP type from Protocol, and, if applicable, the code from Port range. For example, to allow ping commands, choose Echo Request from Protocol.

      • For any other type, the protocol and port range are configured for you.

    2. For Source, do one of the following to allow traffic.

      • Choose Custom and then enter an IP address in CIDR notation, a CIDR block, another security group, or a prefix list.

      • Choose Anywhere to allow all traffic for the specified protocol to reach your instance. This option automatically adds the 0.0.0.0/0 IPv4 CIDR block as the source. If your security group is in a VPC that's enabled for IPv6, this option automatically adds a rule for the ::/0 IPv6 CIDR block.

        Warning

        If you choose Anywhere, you enable all IPv4 and IPv6 addresses to access your instance the specified protocol. If you are adding rules for ports 22 (SSH) or 3389 (RDP), you should authorize only a specific IP address or range of addresses to access your instance.

      • Choose My IP to allow inbound traffic from only your local computer's public IPv4 address.

    3. For Description, optionally specify a brief description for the rule.

  5. Choose Preview changes, Save rules.

To add an outbound rule to a security group

  1. Open the Amazon EC2 console at https://console.amazonaws.cn/ec2/.

  2. In the navigation pane, choose Security Groups.

  3. Select the security group, and choose Actions, Edit outbound rules.

  4. For each rule, choose Add rule and do the following.

    1. For Type, choose the type of protocol to allow.

      • For custom TCP or UDP, you must enter the port range to allow.

      • For custom ICMP, you must choose the ICMP type from Protocol, and, if applicable, the code from Port range.

      • For any other type, the protocol and port range are configured automatically.

    2. For Destination, do one of the following.

      • Choose Custom and then enter an IP address in CIDR notation, a CIDR block, another security group, or a prefix list for which to allow outbound traffic.

      • Choose Anywhere to allow outbound traffic to all IP addresses. This option automatically adds the 0.0.0.0/0 IPv4 CIDR block as the destination.

        If your security group is in a VPC that's enabled for IPv6, this option automatically adds a rule for the ::/0 IPv6 CIDR block.

      • Choose My IP to allow outbound traffic only to your local computer's public IPv4 address.

    3. (Optional) For Description, specify a brief description for the rule.

  5. Choose Preview changes, Confirm.

Command line
To add rules to a security group

Use one of the following commands.

To add one or more egress rules to a security group

Use one of the following commands.

Update security group rules

You can update a security group rule using one of the following methods. The updated rule is automatically applied to any instances that are associated with the security group.

Console

When you modify the protocol, port range, or source or destination of an existing security group rule using the console, the console deletes the existing rule and adds a new one for you.

To update a security group rule

  1. Open the Amazon EC2 console at https://console.amazonaws.cn/ec2/.

  2. In the navigation pane, choose Security Groups.

  3. Select the security group.

  4. Choose Actions, Edit inbound rules to update a rule for inbound traffic or Actions, Edit outbound rules to update a rule for outbound traffic.

  5. Update the rule as required.

  6. Choose Preview changes, Confirm.

To tag a security group rule

  1. Open the Amazon EC2 console at https://console.amazonaws.cn/ec2/.

  2. In the navigation pane, choose Security Groups.

  3. Select the security group.

  4. On the Inbound rules or Outbound rules tab, select the check box for the rule and then choose Manage tags.

  5. The Manage tags page displays any tags that are assigned to the rule. To add a tag, choose Add tag and enter the tag key and value. To delete a tag, choose Remove next to the tag that you want to delete.

  6. Choose Save changes.

Command line

You cannot modify the protocol, port range, or source or destination of an existing rule using the Amazon EC2 API or a command line tools. Instead, you must delete the existing rule and add a new rule. You can, however, update the description of an existing rule.

To update a rule

Use one the following command.

To update the description for an existing inbound rule

Use one of the following commands.

To update the description for an existing outbound rule

Use one of the following commands.

To tag a security group rule

Use one of the following commands.

Delete rules from a security group

When you delete a rule from a security group, the change is automatically applied to any instances associated with the security group.

You can delete rules from a security group using one of the following methods.

Console
To delete a security group rule

  1. Open the Amazon EC2 console at https://console.amazonaws.cn/ec2/.

  2. In the navigation pane, choose Security Groups.

  3. Select the security group to update, choose Actions, and then choose Edit inbound rules to remove an inbound rule or Edit outbound rules to remove an outbound rule.

  4. Choose the Delete button to the right of the rule to delete.

  5. Choose Preview changes, Confirm.

Command line
To remove one or more ingress rules from a security group

Use one of the following commands.

To remove one or more egress rules from a security group

Use one of the following commands.

Delete a security group

You can't delete a security group that is associated with an instance. You can't delete the default security group. You can't delete a security group that is referenced by a rule in another security group in the same VPC. If your security group is referenced by one of its own rules, you must delete the rule before you can delete the security group.

Console
To delete a security group

  1. Open the Amazon EC2 console at https://console.amazonaws.cn/ec2/.

  2. In the navigation pane, choose Security Groups.

  3. Select the security group to delete and choose Actions, Delete security group, Delete.

Command line
To delete a security group

Use one of the following commands.

Assign a security group to an instance

You can assign one or more security groups to an instance when you launch the instance. You can also specify one or more security groups in a launch template. The security groups are assigned to all instances that are launched using the launch template.

Change an instance's security group

After you launch an instance, you can change its security groups by adding or removing security groups.

Requirements

  • The instance must be in the running or stopped state.

  • A security group is specific to a VPC. You can assign a security group to one or more instances launched in the VPC for which you created the security group.

Console
To change the security groups for an instance

  1. Open the Amazon EC2 console at https://console.amazonaws.cn/ec2/.

  2. In the navigation pane, choose Instances.

  3. Select your instance, and then choose Actions, Security, Change security groups.

  4. For Associated security groups, select a security group from the list and choose Add security group.

    To remove an already associated security group, choose Remove for that security group.

  5. Choose Save.

Command line
To change the security groups for an instance

Use one of the following commands.