Use Simple Application Server on the Alibaba Cloud app

Logon

Remote connection

You can use a password or a key pair to remotely connect to a Simple Application Server instance on the Alibaba Cloud app.

Reset a password

After you create a server, you can set its logon password. If you forget the password, you can reset it.

You can set or reset the password for the administrator account only in the console.

• The administrator account for a Linux server is root.

• The administrator account for a Windows server is Administrator.

1. On the Instance List page, select the region where the instance is located. For example, China (Hangzhou).

2. On the server card, choose > Reset Password.

3. Enter and confirm the new password in the Server Management Password and Confirm Password fields, and then click Confirm Reset.

4. In the Restart Server Now dialog box, click Confirm.

   Warning

   Restarting the instance stops it, which may interrupt your services. We recommend that you perform this operation during off-peak hours. You can select No, I will restart it later and then restart the server during off-peak hours for the new password to take effect.

Server monitoring

You can view monitoring information for your Simple Application Server instance, such as traffic, vCPU, memory, and system disk usage. This helps you understand resource usage and improves operations and maintenance (O&M) efficiency.

Start, stop, or restart a server

You can start, stop, or restart a server as needed.

Configure a firewall

The firewall is a virtual firewall that uses rules to control inbound traffic to your Simple Application Server instance and ensure its security. You can add, modify, disable, enable, and delete firewall rules.

1. On the Instance List page, select the region where the instance is located. For example, China (Hangzhou).

2. Click the server card to go to the Details page.

3. Click the Firewall tab and perform the following operations as needed.

   Add a rule

   • You can add a maximum of 50 firewall rules to a single Simple Application Server instance.

   • Port 25 is the default email service port. For security reasons, port 25 is restricted by default on Simple Application Server instances. To send emails, use port 465.

   • The firewall controls only inbound traffic. All outbound traffic is allowed by default.

     • Inbound traffic: Data transmitted from the public network or a private network to the instance.

     • Outbound traffic: Traffic that flows from a Simple Application Server instance to an external destination over the public or internal network.

   1. At the bottom of the page, click Add Rule.

   2. On the Add Rule page, configure the parameters.

      Parameter	Description
      Application Type	Select Custom or a preset application type.
      Protocol	Select TCP, UDP, or ICMP.
      Port Range	The port range is 1 to 65535. The following settings are supported: Set a single port Enter the port number. For example, to allow access to MySQL database port 3306, set the port range to 3306. Set a port range Specify a range separated by a forward slash (/). For example, to allow the FTP port range 20000 to 30000, set the port range to 20000/30000.
      Source IP restriction	The default value is 0.0.0.0/0, which allows access from all IPv4 addresses. You can also specify custom IPv4 addresses: Allow access from a single IPv4 address Enter a single IPv4 address. For example: 192.168.0.100. Allow access from all IPv4 addresses in a CIDR block Enter an IPv4 Classless Inter-Domain Routing (CIDR) block. For example: 192.168.0.0/24.
      Remarks	Enter remarks for the firewall rule to help with future management.

   3. Click Submit.

   Modify a rule

   If a created or default firewall rule does not meet your business needs, you can modify it.

   1. For the target firewall rule, choose > Modify.

   2. On the Modify Rule page, you can modify the Protocol, Port Range, Source IP restriction, and Remarks as needed.

   3. Click Submit.

   Disable a rule

   To temporarily close a port without creating a new firewall rule, you can disable the port.

   Important

   Disabling a firewall rule may make the corresponding port inaccessible and affect your services. Use this feature with caution and ensure it does not affect normal business operations.

   1. For the target firewall rule, choose > Disable.

   2. In the Disable Confirmation dialog box, click OK.

   Enable a rule

   You can enable a disabled port.

   1. For the target firewall rule, choose > Enable.

   2. In the Enable Confirmation dialog box, click OK.

   Delete a rule

   If a firewall rule is no longer needed, you can delete it.

   Note

   If you have not reached the maximum of 50 firewall rules, consider disabling the rule instead of deleting it. This lets you easily enable it again in the future.

   1. For the target firewall rule, choose > Delete.

   2. In the Delete Confirmation dialog box, click Confirm.

Create a snapshot

A snapshot is a backup file of disk data at a specific point in time. Snapshots are often used for daily data backups, recovering data after operational errors or network attacks, and creating custom images.

1. On the Instance List page, select the region where the instance is located. For example, China (Hangzhou).

2. On the server card, choose > Create Snapshot.

3. On the Create Snapshot page, select a disk, enter a snapshot name, and then click Submit.

Renew a server

Renew your server promptly before it expires. Otherwise, the instance and its associated snapshots and custom images are released, and the data cannot be recovered. This section describes how to manually renew a server. For more information about renewals and auto-renewal, see Renew an expired resource.