Adding Record Sets for a Public Zone

An A record set maps a domain name to an IPv4 address. If you have a website with a public IP address and domain name, you can map the domain name to the public IP address by adding an A record set. After the record set is added, the website can be accessed using the domain name.

Constraints

An A record cannot coexist with a CNAME, explicit URL, or implicit URL record for the same name and line.

For details about the conflict rules and handling measures, see Rules for Handling Record Set Conflicts.

Procedure

1. Go to the Public Zones page.
2. Locate the target zone and click Manage Record Sets in the Operation column.

3. Click Add Record Set above the record set list.

   

4. On the Add Record Set page, set record set parameters as instructed.

   

   Table 1 Record set parameters

   Parameter	Description	Example
   Type	Record set type. Select a record set type based on service requirements. For details, see Table 1.	A – Map domains to IPv4 addresses
   Name	Prefix of the domain name to be resolved. This value is left empty by default. For example, if the domain name is example.com, the value of the Name can be as follows: www: The domain name is www.example.com and usually used for a website. Left blank: The domain name is example.com and usually used for a website. To use an at sign (@) as the domain name prefix, just leave this parameter blank. abc: The domain name is abc.example.com, a subdomain of example.com. mail: The domain name is mail.example.com and usually used for email servers. *: The domain name is *.example.com. It covers all subdomains of example.com.	Leave it blank.
   Line	Resolution line. The DNS server will return the IP address of the specified line, depending on where end users come from. The default value is Default. Default: returns the default resolution result irrespective of where the visitors come from. ISP: returns the resolution result based on end users' carrier networks. For details, see Configuring ISP Lines. Region: returns the resolution result based on end users' geographical locations. For details, see Configuring Region Lines.	Default
   TTL (s)	How long a local DNS server caches a DNS record. It is measured in seconds. Default value: 300 Value range: 1 to 2147483647 If your service address changes frequently, set TTL to a smaller value. Otherwise, set TTL to a larger value.	300
   Value	Record set value, which is usually the public IP address of a website server. You can enter a maximum of 50 unique IP addresses, each on a separate line.	198.xx.xx.100 198.xx.xx.101 198.xx.xx.102
   Alias	Whether to associate the record set with a cloud resource. Unlike a CNAME record set, an alias supports second-level domain names. This option is disabled by default. Types of record sets that support alias include A, MX, AAAA, TXT, SRV and CAA.	Disabled
   Alias Target	Cloud resource to be associated with the alias record set, which includes the cloud resource name and alias target.	-
   Weight	Weight for the record set. Default value: 1 Value range: 0 to 1000 If a resolution line in a zone contains multiple record sets of the same type, you can set different weights to each record set. For details, see Configuring Weighted Routing.	1
   Tag	Identifier of the record set. Each tag contains a key and a value. You can add up to 20 tags for a record set. The tag key: Cannot be left blank. Must be unique for each resource. Can contain a maximum of 128 characters. Cannot start or end with a space, or cannot start with _sys_. Only letters, digits, spaces, and the following special characters are allowed: _.:=+-@ The tag value: Can be left blank. Can contain a maximum of 255 characters. Can contain letters, digits, spaces, and special characters _ . : / = + - @. NOTE: If your organization has configured tag policies for the DNS service, you need to add tags to your record sets based on the tag policies. If you add a tag that does not comply with the tag policies, record sets may fail to be created. Contact the administrator to learn more about tag policies.	example_key1 example_value1
   Description	Supplementary information about the record set. The description can contain a maximum of 255 characters.	Routing Internet traffic to a website

5. Click OK.

A CNAME record maps a domain name to another. It is commonly used for domain name resolution of CDN, WAF, OBS buckets, and EWP. You can also use CNAME records to map a subdomain name (for example, starting with www.) to the primary domain name.

Constraints

A CNAME record cannot coexist with other types of records for the same name and line.

For details about the conflict rules and handling measures, see Rules for Handling Record Set Conflicts.

Procedure

1. Go to the Public Zones page.
2. Locate the target zone and click Manage Record Sets in the Operation column.

3. Click Add Record Set above the record set list.

   

4. On the Add Record Set page, set record set parameters as instructed.

   

   Table 2 Record set parameters

   Parameter	Description	Example
   Type	Record set type. Select a record set type based on service requirements. For details, see Table 1.	CNAME – Map one domain to another
   Name	Prefix of the domain name to be resolved. This value is left empty by default. For example, if the domain name is example.com, the value of the Name can be as follows: www: The domain name is www.example.com and usually used for a website. Left blank: The domain name is example.com and usually used for a website. To use an at sign (@) as the domain name prefix, just leave this parameter blank. abc: The domain name is abc.example.com, a subdomain of example.com. mail: The domain name is mail.example.com and usually used for email servers. *: The domain name is *.example.com. It covers all subdomains of example.com.	Leave it blank.
   Line	Resolution line. The DNS server will return the IP address of the specified line, depending on where end users come from. The default value is Default. Default: returns the default resolution result irrespective of where the visitors come from. ISP: returns the resolution result based on end users' carrier networks. For details, see Configuring ISP Lines. Region: returns the resolution result based on end users' geographical locations. For details, see Configuring Region Lines.	Default
   TTL (s)	How long a local DNS server caches a DNS record. It is measured in seconds. Default value: 300 Value range: 1 to 2147483647 If your service address changes frequently, set TTL to a smaller value. Otherwise, set TTL to a larger value.	300
   Value	The domain name returned for DNS resolution, which is usually another domain name that maps the target IP address. You can enter a maximum of 50 unique IP addresses, each on a separate line.	www.example.com
   Weight	Weight for the record set. Default value: 1 Value range: 0 to 1000 If a resolution line in a zone contains multiple record sets of the same type, you can set different weights to each record set. For details, see Configuring Weighted Routing.	1
   Tag	Identifier of the record set. Each tag contains a key and a value. You can add up to 20 tags for a record set. The tag key: Cannot be left blank. Must be unique for each resource. Can contain a maximum of 128 characters. Cannot start or end with a space, or cannot start with _sys_. Only letters, digits, spaces, and the following special characters are allowed: _.:=+-@ The tag value: Can be left blank. Can contain a maximum of 255 characters. Can contain letters, digits, spaces, and special characters _ . : / = + - @. NOTE: If your organization has configured tag policies for the DNS service, you need to add tags to your record sets based on the tag policies. If you add a tag that does not comply with the tag policies, record sets may fail to be created. Contact the administrator to learn more about tag policies.	example_key1 example_value1
   Description	Supplementary information about the record set. The description can contain a maximum of 255 characters.	Routing Internet traffic to a website

5. Click OK.

A Mail Exchange (MX) record set is used to specify the mail server that handles emails from a specific domain name. When an email system sends an email, it searches for the desired MX record based on the domain name in the recipient address to determine the location of the target mail server, ensuring that the email can be correctly sent to the target server. An MX record set contains the addresses and priorities of multiple mail servers to ensure the reliability and efficiency of email transmission.

Constraints

An MX record cannot coexist with a CNAME, explicit URL, or implicit URL record for the same name and line.

For details about the conflict rules and handling measures, see Rules for Handling Record Set Conflicts.

Procedure

1. Go to the Public Zones page.
2. Locate the target zone and click Manage Record Sets in the Operation column.

3. Click Add Record Set above the record set list.

   

4. On the Add Record Set page, set record set parameters as instructed.

   

   Table 3 Record set parameters

   Parameter	Description	Example
   Type	Record set type. Select a record set type based on service requirements. For details, see Table 1.	MX – Map domains to email servers
   Name	Prefix of the domain name to be resolved. This value is left empty by default. For example, if the domain name is example.com, the value of the Name can be as follows: www: The domain name is www.example.com and usually used for a website. Left blank: The domain name is example.com and usually used for a website. To use an at sign (@) as the domain name prefix, just leave this parameter blank. abc: The domain name is abc.example.com, a subdomain of example.com. mail: The domain name is mail.example.com and usually used for email servers. *: The domain name is *.example.com. It covers all subdomains of example.com.	Leave it blank.
   Line	Resolution line. The DNS server will return the IP address of the specified line, depending on where end users come from. The default value is Default. Default: returns the default resolution result irrespective of where the visitors come from. ISP: returns the resolution result based on end users' carrier networks. For details, see Configuring ISP Lines. Region: returns the resolution result based on end users' geographical locations. For details, see Configuring Region Lines.	Default
   TTL (s)	How long a local DNS server caches a DNS record. It is measured in seconds. Default value: 300 Value range: 1 to 2147483647 If your service address changes frequently, set TTL to a smaller value. Otherwise, set TTL to a larger value.	300
   Value	Enter email server addresses. You can enter a maximum of 50 unique addresses, each on a separate line. The format is [priority][mail-server-host-name]. Configuration rules: priority: priority for an email server to receive emails. A smaller value indicates a higher priority. mail server host name: domain name provided by the email service provider	10 mailserver.example.com.
   Alias	Whether to associate the record set with a cloud resource. Unlike a CNAME record set, an alias supports second-level domain names. This option is disabled by default. Types of record sets that support alias include A, MX, AAAA, TXT, SRV and CAA.	Disabled
   Alias Target	Cloud resource to be associated with the alias record set, which includes the cloud resource name and alias target.	-
   Weight	Weight for the record set. Default value: 1 Value range: 0 to 1000 If a resolution line in a zone contains multiple record sets of the same type, you can set different weights to each record set. For details, see Configuring Weighted Routing.	1
   Tag	Identifier of the record set. Each tag contains a key and a value. You can add up to 20 tags for a record set. The tag key: Cannot be left blank. Must be unique for each resource. Can contain a maximum of 128 characters. Cannot start or end with a space, or cannot start with _sys_. Only letters, digits, spaces, and the following special characters are allowed: _.:=+-@ The tag value: Can be left blank. Can contain a maximum of 255 characters. Can contain letters, digits, spaces, and special characters _ . : / = + - @. NOTE: If your organization has configured tag policies for the DNS service, you need to add tags to your record sets based on the tag policies. If you add a tag that does not comply with the tag policies, record sets may fail to be created. Contact the administrator to learn more about tag policies.	example_key1 example_value1
   Description	Supplementary information about the record set. The description can contain a maximum of 255 characters.	Email domain name resolution

5. Click OK.

An AAAA record is used to map a domain name to an IPv6 address. It is used for domain name resolution when websites support IPv6 addresses. If you have a website with a public IPv6 address and domain name, you can map the domain name to the IPv6 address by adding an AAAA record set. After the record set is added, the website can be accessed using the domain name.

Constraints

An AAAA record cannot coexist with a CNAME, explicit URL, or implicit URL record for the same name and line.

For details about the conflict rules and handling measures, see Rules for Handling Record Set Conflicts.

Procedure

1. Go to the Public Zones page.
2. Locate the target zone and click Manage Record Sets in the Operation column.

3. Click Add Record Set above the record set list.

   

4. On the Add Record Set page, set record set parameters as instructed.

   

   Table 4 Record set parameters

   Parameter	Description	Example
   Type	Record set type. Select a record set type based on service requirements. For details, see Table 1.	AAAA – Map domain names to IPv6 addresses
   Name	Prefix of the domain name to be resolved. This value is left empty by default. For example, if the domain name is example.com, the value of the Name can be as follows: www: The domain name is www.example.com and usually used for a website. Left blank: The domain name is example.com and usually used for a website. To use an at sign (@) as the domain name prefix, just leave this parameter blank. abc: The domain name is abc.example.com, a subdomain of example.com. mail: The domain name is mail.example.com and usually used for email servers. *: The domain name is *.example.com. It covers all subdomains of example.com.	Leave it blank.
   Line	Resolution line. The DNS server will return the IP address of the specified line, depending on where end users come from. The default value is Default. Default: returns the default resolution result irrespective of where the visitors come from. ISP: returns the resolution result based on end users' carrier networks. For details, see Configuring ISP Lines. Region: returns the resolution result based on end users' geographical locations. For details, see Configuring Region Lines.	Default
   TTL (s)	How long a local DNS server caches a DNS record. It is measured in seconds. Default value: 300 Value range: 1 to 2147483647 If your service address changes frequently, set TTL to a smaller value. Otherwise, set TTL to a larger value.	300
   Value	IPv6 addresses mapped to the domain name. You can enter a maximum of 50 unique IP addresses, each on a separate line.	ff03:0db8:85a3:0:0:8a2e:0370:7334
   Alias	Whether to associate the record set with a cloud resource. Unlike a CNAME record set, an alias supports second-level domain names. This option is disabled by default. Types of record sets that support alias include A, MX, AAAA, TXT, SRV and CAA.	Disabled
   Alias Target	Cloud resource to be associated with the alias record set, which includes the cloud resource name and alias target.	-
   Weight	Weight for the record set. Default value: 1 Value range: 0 to 1000 If a resolution line in a zone contains multiple record sets of the same type, you can set different weights to each record set. For details, see Configuring Weighted Routing.	1
   Tag	Identifier of the record set. Each tag contains a key and a value. You can add up to 20 tags for a record set. The tag key: Cannot be left blank. Must be unique for each resource. Can contain a maximum of 128 characters. Cannot start or end with a space, or cannot start with _sys_. Only letters, digits, spaces, and the following special characters are allowed: _.:=+-@ The tag value: Can be left blank. Can contain a maximum of 255 characters. Can contain letters, digits, spaces, and special characters _ . : / = + - @. NOTE: If your organization has configured tag policies for the DNS service, you need to add tags to your record sets based on the tag policies. If you add a tag that does not comply with the tag policies, record sets may fail to be created. Contact the administrator to learn more about tag policies.	example_key1 example_value1
   Description	Supplementary information about the record set. Can contain a maximum of 255 characters.	IPv6 address type

5. Click OK.

A TXT record is used to identify and describe a domain name. It is usually used for configuring SPF (anti-spam), DKIM (email signature), and verifying the domain name ownership.

Constraints

A TXT record cannot coexist with a CNAME, explicit URL, or implicit URL record for the same name and line.

For details about the conflict rules and handling measures, see Rules for Handling Record Set Conflicts.

Procedure

1. Go to the Public Zones page.
2. Locate the target zone and click Manage Record Sets in the Operation column.

3. Click Add Record Set above the record set list.

   

4. On the Add Record Set page, set record set parameters as instructed.

   

   Table 5 Record set parameters

   Parameter	Description	Example
   Type	Record set type. Select a record set type based on service requirements. For details, see Table 1.	TXT – Specify text records
   Name	Prefix of the domain name to be resolved. This value is left empty by default. For example, if the domain name is example.com, the value of the Name can be as follows: www: The domain name is www.example.com and usually used for a website. Left blank: The domain name is example.com and usually used for a website. To use an at sign (@) as the domain name prefix, just leave this parameter blank. abc: The domain name is abc.example.com, a subdomain of example.com. mail: The domain name is mail.example.com and usually used for email servers. *: The domain name is *.example.com. It covers all subdomains of example.com.	Leave it blank.
   Line	Resolution line. The DNS server will return the IP address of the specified line, depending on where end users come from. The default value is Default. Default: returns the default resolution result irrespective of where the visitors come from. ISP: returns the resolution result based on end users' carrier networks. For details, see Configuring ISP Lines. Region: returns the resolution result based on end users' geographical locations. For details, see Configuring Region Lines.	Default
   TTL (s)	How long a local DNS server caches a DNS record. It is measured in seconds. Default value: 300 Value range: 1 to 2147483647 If your service address changes frequently, set TTL to a smaller value. Otherwise, set TTL to a larger value.	300
   Value	Enter text content as required. Configuration rules: Text record values must be enclosed in double quotation marks. One or more text record values are supported, each on a separate line. A maximum of 50 text record values can be entered. A single text record value can contain multiple character strings, each of which is double quoted and separated from others using a space. One character string cannot exceed 255 characters. A value must not exceed 4,096 characters. The value cannot be left blank. The text cannot contain a backslash (\).	Single text record: "aaa" Multiple text records: "bbb" "ccc" A text record that contains multiple strings: "ddd" "eee" "fff" Text record in SPF format: "v=spf1 a mx -all" Only IP addresses in the A and MX record sets are authorized to send emails using this domain name.
   Alias	Whether to associate the record set with a cloud resource. Unlike a CNAME record set, an alias supports second-level domain names. This option is disabled by default. Types of record sets that support alias include A, MX, AAAA, TXT, SRV and CAA.	Disabled
   Alias Target	Cloud resource to be associated with the alias record set, which includes the cloud resource name and alias target.	-
   Weight	Weight for the record set. Default value: 1 Value range: 0 to 1000 If a resolution line in a zone contains multiple record sets of the same type, you can set different weights to each record set. For details, see Configuring Weighted Routing.	1
   Tag	Identifier of the record set. Each tag contains a key and a value. You can add up to 20 tags for a record set. The tag key: Cannot be left blank. Must be unique for each resource. Can contain a maximum of 128 characters. Cannot start or end with a space, or cannot start with _sys_. Only letters, digits, spaces, and the following special characters are allowed: _.:=+-@ The tag value: Can be left blank. Can contain a maximum of 255 characters. Can contain letters, digits, spaces, and special characters _ . : / = + - @. NOTE: If your organization has configured tag policies for the DNS service, you need to add tags to your record sets based on the tag policies. If you add a tag that does not comply with the tag policies, record sets may fail to be created. Contact the administrator to learn more about tag policies.	example_key1 example_value1
   Description	Supplementary information about the record set. Can contain a maximum of 255 characters.	TXT record set

5. Click OK.

An SRV record is used to identify the services provided by a cloud server. It usually applies to VoIP, instant messaging, and email to provide load balancing, failover, and automatic service discovery.

Constraints

An SRV record cannot coexist with a CNAME, explicit URL, or implicit URL record for the same name and line.

For details about the conflict rules and handling measures, see Rules for Handling Record Set Conflicts.

Procedure

1. Go to the Public Zones page.
2. Locate the target zone and click Manage Record Sets in the Operation column.

3. Click Add Record Set above the record set list.

   

4. On the Add Record Set page, set record set parameters as instructed.

   

   Table 6 Record set parameters

   Parameter	Description	Example
   Type	Record set type. Select a record set type based on service requirements. For details, see Table 1.	SRV – Record servers providing specific services
   Name	Prefix of the domain name to be resolved. This value is left empty by default. For example, if the domain name is example.com, the value of the Name can be as follows: www: The domain name is www.example.com and usually used for a website. Left blank: The domain name is example.com and usually used for a website. To use an at sign (@) as the domain name prefix, just leave this parameter blank. abc: The domain name is abc.example.com, a subdomain of example.com. mail: The domain name is mail.example.com and usually used for email servers. *: The domain name is *.example.com. It covers all subdomains of example.com.	Leave it blank.
   Line	Resolution line. The DNS server will return the IP address of the specified line, depending on where end users come from. The default value is Default. Default: returns the default resolution result irrespective of where the visitors come from. ISP: returns the resolution result based on end users' carrier networks. For details, see Configuring ISP Lines. Region: returns the resolution result based on end users' geographical locations. For details, see Configuring Region Lines.	Default
   TTL (s)	How long a local DNS server caches a DNS record. It is measured in seconds. Default value: 300 Value range: 1 to 2147483647 If your service address changes frequently, set TTL to a smaller value. Otherwise, set TTL to a larger value.	300
   Value	Enter the specific server address. You can enter a maximum of 50 unique addresses, each on a separate line. The value format is [priority] [weight] [port] [server host name]. Configuration rules: The priority, weight, and port number range from 0 to 65535. A smaller value indicates a higher priority. A larger value indicates a larger weight. The host name is the domain name of the target server. NOTE: If the record set values have the same priority, requests to the domain name will be routed based on weights.	3 3 2176 server-www.example.com
   Alias	Whether to associate the record set with a cloud resource. Unlike a CNAME record set, an alias supports second-level domain names. This option is disabled by default. Types of record sets that support alias include A, MX, AAAA, TXT, SRV and CAA.	Disabled
   Alias Target	Cloud resource to be associated with the alias record set, which includes the cloud resource name and alias target.	-
   Weight	Weight for the record set. Default value: 1 Value range: 0 to 1000 If a resolution line in a zone contains multiple record sets of the same type, you can set different weights to each record set. For details, see Configuring Weighted Routing.	1
   Tag	Identifier of the record set. Each tag contains a key and a value. You can add up to 20 tags for a record set. The tag key: Cannot be left blank. Must be unique for each resource. Can contain a maximum of 128 characters. Cannot start or end with a space, or cannot start with _sys_. Only letters, digits, spaces, and the following special characters are allowed: _.:=+-@ The tag value: Can be left blank. Can contain a maximum of 255 characters. Can contain letters, digits, spaces, and special characters _ . : / = + - @. NOTE: If your organization has configured tag policies for the DNS service, you need to add tags to your record sets based on the tag policies. If you add a tag that does not comply with the tag policies, record sets may fail to be created. Contact the administrator to learn more about tag policies.	example_key1 example_value1
   Description	Supplementary information about the record set. Can contain a maximum of 255 characters.	SRV record set

5. Click OK.

An NS record specifies authoritative DNS servers for a domain name. If you want to delegate a subdomain to other DNS service providers, you can add an NS record for the subdomain.

Constraints

If a conflict occurs when you add an NS record, handle it by referring to Rules for Handling Record Set Conflicts.

Procedure

1. Go to the Public Zones page.
2. Locate the target zone and click Manage Record Sets in the Operation column.

3. Click Add Record Set above the record set list.

   

4. On the Add Record Set page, set record set parameters as instructed.

   

   Table 7 Record set parameters

   Parameter	Description	Example
   Type	Record set type. Select a record set type based on service requirements. For details, see Table 1.	NS – Delegate subdomains to other name servers
   Name	Prefix of the domain name to be resolved. This value is left empty by default. For example, if the domain name is example.com, the value of the Name can be as follows: www: The domain name is www.example.com and usually used for a website. Left blank: The domain name is example.com and usually used for a website. To use an at sign (@) as the domain name prefix, just leave this parameter blank. abc: The domain name is abc.example.com, a subdomain of example.com. mail: The domain name is mail.example.com and usually used for email servers. *: The domain name is *.example.com. It covers all subdomains of example.com.	www
   Line	Resolution line. The DNS server will return the IP address of the specified line, depending on where end users come from. The default value is Default. Default: returns the default resolution result irrespective of where the visitors come from. ISP: returns the resolution result based on end users' carrier networks. For details, see Configuring ISP Lines. Region: returns the resolution result based on end users' geographical locations. For details, see Configuring Region Lines.	Default
   TTL (s)	How long a local DNS server caches a DNS record. It is measured in seconds. Default value: 300 Value range: 1 to 2147483647 If your service address changes frequently, set TTL to a smaller value. Otherwise, set TTL to a larger value.	300
   Value	Enter the addresses of the domain name servers to be authorized. You can enter a maximum of 50 unique addresses, each on a separate line.	ns.example.com
   Weight	Weight for the record set. Default value: 1 Value range: 0 to 1000 If a resolution line in a zone contains multiple record sets of the same type, you can set different weights to each record set. For details, see Configuring Weighted Routing.	1
   Tag	Identifier of the record set. Each tag contains a key and a value. You can add up to 20 tags for a record set. The tag key: Cannot be left blank. Must be unique for each resource. Can contain a maximum of 128 characters. Cannot start or end with a space, or cannot start with _sys_. Only letters, digits, spaces, and the following special characters are allowed: _.:=+-@ The tag value: Can be left blank. Can contain a maximum of 255 characters. Can contain letters, digits, spaces, and special characters _ . : / = + - @. NOTE: If your organization has configured tag policies for the DNS service, you need to add tags to your record sets based on the tag policies. If you add a tag that does not comply with the tag policies, record sets may fail to be created. Contact the administrator to learn more about tag policies.	example_key1 example_value1
   Description	Supplementary information about the record set. Can contain a maximum of 255 characters.	NS record added for a subdomain

5. Click OK.

A CAA record specifies the CA that issues HTTPS certificates for a domain name to prevent incorrect certificate issuing.

Constraints

A CAA record cannot coexist with a CNAME, explicit URL, or implicit URL record for the same name and line.

For details about the conflict rules and handling measures, see Rules for Handling Record Set Conflicts.

Procedure

1. Go to the Public Zones page.
2. Locate the target zone and click Manage Record Sets in the Operation column.

3. Click Add Record Set above the record set list.

   

4. On the Add Record Set page, set record set parameters as instructed.

   

   Table 8 Record set parameters

   Parameter	Description	Example
   Type	Record set type. Select a record set type based on service requirements. For details, see Table 1.	CAA – Grant certificate issuing permissions to CAs
   Name	Prefix of the domain name to be resolved. This value is left empty by default. For example, if the domain name is example.com, the value of the Name can be as follows: www: The domain name is www.example.com and usually used for a website. Left blank: The domain name is example.com and usually used for a website. To use an at sign (@) as the domain name prefix, just leave this parameter blank. abc: The domain name is abc.example.com, a subdomain of example.com. mail: The domain name is mail.example.com and usually used for email servers. *: The domain name is *.example.com. It covers all subdomains of example.com.	Leave it blank.
   Line	Resolution line. The DNS server will return the IP address of the specified line, depending on where end users come from. The default value is Default. Default: returns the default resolution result irrespective of where the visitors come from. ISP: returns the resolution result based on end users' carrier networks. For details, see Configuring ISP Lines. Region: returns the resolution result based on end users' geographical locations. For details, see Configuring Region Lines.	Default
   TTL (s)	How long a local DNS server caches a DNS record. It is measured in seconds. Default value: 300 Value range: 1 to 2147483647 If your service address changes frequently, set TTL to a smaller value. Otherwise, set TTL to a larger value.	300
   Value	CA to be authorized to issue certificates for a domain name or its subdomains. You can enter a maximum of 50 different CAs, each on a separate line. The format is [flag] [tag] [value]. Configuration rules: flag: CA identifier, an unsigned character ranging from 0 to 255. Usually, the value is set to 0. tag: You can enter 1 to 15 characters. Only letters and digits from 0 to 9 are allowed. The tag can be one of the following: issue: authorizes a CA to issue all types of certificates. issuewild: authorizes a CA to issue wildcard certificates. iodef: requests notifications once a CA receives invalid certificate requests. value: authorized CA or email address/URL required for notification once the CA receives invalid certificate requests. The value depends on the value of tag and must be enclosed in quotation marks (""). The value can contain a maximum of 255 characters. Only letters, digits, spaces, and the following special characters are allowed: -#*?&_~=:;.@+^/!%	0 issue "ca.abc.com" 0 issuewild "ca.def.com" 0 iodef "mailto:admin@domain.com" 0 iodef "http://domain.com/log/"
   Alias	Whether to associate the record set with a cloud resource. Unlike a CNAME record set, an alias supports second-level domain names. This option is disabled by default. Types of record sets that support alias include A, MX, AAAA, TXT, SRV and CAA.	Disabled
   Alias Target	Cloud resource to be associated with the alias record set, which includes the cloud resource name and alias target.	-
   Weight	Weight for the record set. Default value: 1 Value range: 0 to 1000 If a resolution line in a zone contains multiple record sets of the same type, you can set different weights to each record set. For details, see Configuring Weighted Routing.	1
   Tag	Identifier of the record set. Each tag contains a key and a value. You can add up to 20 tags for a record set. The tag key: Cannot be left blank. Must be unique for each resource. Can contain a maximum of 128 characters. Cannot start or end with a space, or cannot start with _sys_. Only letters, digits, spaces, and the following special characters are allowed: _.:=+-@ The tag value: Can be left blank. Can contain a maximum of 255 characters. Can contain letters, digits, spaces, and special characters _ . : / = + - @. NOTE: If your organization has configured tag policies for the DNS service, you need to add tags to your record sets based on the tag policies. If you add a tag that does not comply with the tag policies, record sets may fail to be created. Contact the administrator to learn more about tag policies.	example_key1 example_value1
   Description	Supplementary information about the record set. Can contain a maximum of 255 characters.	CAA record set

5. Click OK.

1. Go to the Public Zones page.
2. Locate the target zone and click Manage Record Sets in the Operation column.

3. Click Add Record Set above the record set list.