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Add and manage listeners

This guide explains how to add a listener to a load balancer, view listener lists, change information, and set rules and conditions for managing listeners.

Add listener​

Add HTTP listener​

  1. Go to Beyond Networking Service > Load Balancing > Load Balancer in the KakaoCloud Console.
  2. Select a load balancer to add an HTTP listener from the load balancer list.
  3. Click the Listener tab and then click the [Add listener] button.
  4. In the popup, select the HTTP protocol and modify the port if necessary.
  5. Select a target and click the [Add] button.

Add HTTPS listener​

  1. Go to Beyond Networking Service > Load Balancing > Load Balancer in the KakaoCloud Console.

  2. Select a load balancer to add an HTTPS listener from the load balancer list.

  3. Click the Listener tab and then click the [Add listener] button.

  4. In the popup, select the HTTPS protocol and modify the port if necessary.

  5. Select a target and default SSL certificate and click the [Add] button. You can select an existing certificate or add a new certificate as follows:

    Supported cipher suite list by Min TLS version​

    Min TLS versionTLSv1.0TLSv1.1TLSv1.2
    TLS protocol
    TLSv1.0v
    TLSv1.1vv
    TLSv1.2vvv
    Cipher Suite
    ECDHE-RSA-AES128-GCM-SHA256v
    ECDHE_RSA_AES128_CBC_SHA(ECDHE-RSA-AES128-SHA)vvv
    ECDHE-RSA-AES128-SHA256v
    ECDHE-RSA-AES256-GCM-SHA384v
    ECDHE_RSA_AES256_CBC_SHA(ECDHE-RSA-AES256-SHA)vvv
    ECDHE-RSA-AES256-SHA384v
    AES128-GCM-SHA256v
    AES128-SHAvvv
    AES128-SHA256v
    AES256-GCM-SHA384v
    AES256-SHAvvv
    AES256-SHA256v
    CAMELLIA128-SHAvvv
    CAMELLIA256-SHAvvv
    DHE-RSA-AES128-GCM-SHA256v
    DHE-RSA-AES128-SHAvvv
    DHE-RSA-AES128-SHA256v
    DHE-RSA-AES256-GCM-SHA384v
    DHE-RSA-AES256-SHAvvv
    DHE-RSA-AES256-SHA256v
    DHE-RSA-CAMELLIA128-SHAvvv
    DHE-RSA-CAMELLIA256-SHAvvv
    ECDHE_ECDSA_AES128_SHAvvv
info

After adding a listener, you can connect the target group by going to [More] icon > Configure listener. If the default forwarding target is 'Not set', an error will occur when accessing the service externally. Therefore, please connect a target group.

View listeners​

You can modify or delete existing listeners or add new listeners.

View listener list​

  1. Go to Beyond Networking Service > Load Balancing > Load Balancer in the KakaoCloud Console.

  2. Select a load balancer from the load balancer list.

  3. Click the Listener tab to view the list of listeners associated to the load balancer.

    CategoryDescription
    Protocol:PortProtocol and port of the listener
    IDID assigned at creation
    Provisioning statusInformation on whether the listener was successfully created or is in the process of being modified or deleted
    Operating statusInformation on whether the created listener is available for use
    Min TLS versionSecurity policy used for HTTPS communication between the client and the load balancer
    Default SSL certificateCertificate used for HTTPS communication between the client and the load balancer
    Default actionThe default action to handle traffic received by the Listener, fixed to Forward
    - If a target group is associated, the target group name is displayed
    RuleNumber of added rules with one rule applied by default
    [More] iconProvides options to configure or delete the listener

View listener details​

  1. Go to Beyond Networking Service > Load Balancing > Load Balancer in the KakaoCloud Console.

  2. Select a load balancer from the load balancer list.

  3. Click the Listener tab and click the expand button.

    image Listener details

    TypeItemDescription
    RuleRule orderRules are applied in the order of their numbers, with smaller numbers applied first
    ConditionIf they are different types regardless of order, use AND;
    if they are the same type, use OR to determine the traffic's true/false status, and if ultimately true, the rule is applied
    ActionAction that occurs when the rule is applied
    [Edit] iconClicking this will display a rule edit popup
    [Delete] iconClicking this will display a rule delete popup
    CertificateDefaultWhether it is the default certificate
    Certificate IDID assigned when adding the certificate
    DomainCertificate domain
    Registered atCertificate registration date
    Expired atCertificate expiration date
    [Disassociate] IconClicking this will display a disassociate popup
    AttributesHTTP/2Fixed as not using HTTP/2
    Idle timeoutSetting value for connection idle timeout
    X-Forwarded-For header processingOptions for handling X-Forwarded-For header: Attach, Preserve, Remove
    X-Forwarded-Port forwardingWhether to use X-Forwarded-Port forwarding
    X-Forwarded-Proto forwardingWhether to use X-Forwarded-Proto forwarding
    Max connections settingsIf set to enabled, displays the maximum value set

Manage listener​

Change target group​

  1. Go to Beyond Networking Service > Load Balancing > Load Balancer in the KakaoCloud Console.

  2. Select a load balancer to modify from the list.

  3. Click the Listener tab, then click the [More] icon > Configure listener.

  4. In the popup, select a target group and click [OK].

Set minimum TLS version​

If you select the HTTPS protocol for the load balancer’s Listener, you can set the Min TLS version.

  1. Go to Beyond Networking Service > Load Balancing > Load Balancer in the KakaoCloud Console.

  2. Select a load balancer.

  3. In the details view, click the Listener tab, then click the [More] and Configure listener.

  4. Choose the TLS version and click [OK].

Change default certificate from all certificates​

If you select the HTTPS protocol for the load balancer’s Listener, you can change the default certificate.

  1. Go to Beyond Networking Service > Load Balancing > Load Balancer in the KakaoCloud Console.

  2. Select a load balancer from the list.

  3. In the details view, click the Listener tab, then click the [More] icon > Configure listener.

  4. Choose the certificate from the SSL certificate list, then click [OK].

caution

If there are no associated certificates available to set as the default or if all associated certificates are in a deleted state, you cannot change the default certificate. For more details, refer to Add certificate.

Add certificate​

If you select the HTTPS protocol for the load balancer’s listener, you can connect up to 5 additional certificates excluding the default certificate.

  1. Go to Beyond Networking Service > Load Balancing > Load Balancer in the KakaoCloud Console.

  2. Select a load balancer from the list.

  3. In the details view, click the Listener tab, then select a listener to add a certificate.

  4. Click the [Add certificate] button.

    Image Associate certificate

    Image Add new certificate

  5. In the popup, select the SSL certificates to connect additionally.

  6. Click [Associate].

Set default certificate from associated certificates​

If you select the HTTPS protocol for the load balancer’s Listener, you can select a default certificate from the certificates associated when creating the listener or any additional certificates.

  1. Go to Beyond Networking Service > Load Balancing > Load Balancer in the KakaoCloud Console.

  2. Select a load balancer from the list.

  3. In the details view, select a listener on the Listener tab.

  4. Click the [Set default certificate] button.

  5. In the popup, review the list of associated certificates and select the certificate to set as default.

  6. Click [Save].

caution

If there are no associated certificates available to set as default or if all associated certificates are in a deleted state, you cannot change the default certificate. In this case, refer to Add certificate to associate a new certificate and then replace the default certificate.

Disassociate certificate​

If you select the HTTPS protocol for the load balancer’s listener, you can disassociate all certificates except the default one.

  1. Go to Beyond Networking Service > Load Balancing > Load Balancer in the KakaoCloud Console.

  2. Select a load balancer from the list.

  3. In the details view, click the Listener tab, then select a listener.

  4. Review the list of associated certificates and check the one to disassociate.

  5. Click the [Disassociate] button.

  6. In the popup, review the details and click the [Disassociate] button.

caution

If there are deleted certificates associated, check all deleted certificates (except the default) in the certificate list and disassociate them before changing or connecting other certificates.

Delete certificate​

If the listener protocol of the load balancer is set to HTTPS, you can delete unused or expired certificates.

  1. Go to Beyond Networking Service > Load Balancing > Load Balancer in the KakaoCloud Console.

  2. Select the load balancer that contains the listener to modify from the Load Balancer list.

  3. In the details screen, click the Listener tab and select the listener to delete the certificate.

  4. In the listener details screen, click the [Manage all certificates] button.

  5. Review the list of registered certificates and select the [Delete] icon.

  6. In the popup window, enter the deletion confirmation text and click the [Delete] button.

caution

If you delete a certificate that is set as the default certificate for a listener, the communication for that listener may not function properly. Before deleting a certificate, please refer to Set default certificate to replace the certificate.

Set or remove maximum connection limit​

If the Load Balancer's Listener protocol is set to HTTP or HTTPS, you can configure the maximum connection limit/release.

  1. Go to Beyond Networking Service > Load Balancing > Load Balancer in the KakaoCloud Console.

  2. Select the Load Balancer from the load balancer list.

  3. In the detailed screen, click a listener on the Listener tab.

  4. In the listener detailed screen, click the [Configure max connections] button.

  5. Change the settings in the popup.

    • To limit the maximum value: Switch the maximum connection item to "Enabled" or keep it "Enabled" and enter the allowed maximum value.
      (Maximum connection: 1~2,147,483,647)
    • To release the maximum value limit: Switch the maximum connection item to "Disabled".

    Image Configure max connections

  6. Click the [Apply] button.

Set idle timeout​

  1. Go to Beyond Networking Service > Load Balancing > Load Balancer in the KakaoCloud Console.

  2. Select the Load Balancer from the load balancer list.

  3. In the detailed screen, click a listener on the Listener tab.

  4. In the Listener detailed screen, click the [Configure attributes].

  5. Modify the idle timeout in the popup.

    • Idle timeout: Enter a value between 1~4000 (default is 50 seconds).

  6. Click the [Save] button.

Set packet (X-Forwarded-For Header)​

  1. Go to KakaoCloud Console > Beyond Networking Service > Load Balancing > Load Balancer menu.

  2. Select the Load Balancer from the load balancer list.

  3. In the detailed screen, click a listener on the Listener tab.

  4. In the Listener detailed screen, click the [Configure attributes] button.

  5. Modify the packet settings in the popup.

    • X-Forwarded-For header processing
      ᄂAttach: Select the Attach option to save the IP addresses of clients that have passed through in the X-Forwarded-For request header and forward them to the server.
      ᄂPreserve: Select the Preserve option to forward the X-Forwarded-For request header to the target without any modifications.
      ᄂRemove: Select the Remove option to delete the X-Forwarded-For request header from the request before forwarding it to the target.
    • X-Forwarded-Port transmission
      ᄂSwitch to 'Enabled' to preserve the port in the header.
      ᄂSwitch to 'Disabled' to not preserve the port in the header.
    • X-Forwarded-Proto
      ᄂSwitch to 'Enabled' to preserve the protocol in the header.
      ᄂSwitch to 'Disabled' to not preserve the protocol in the header.

    Image Listener attribute

  6. Click the [Save] button.

Delete listener​

  1. Go to Beyond Networking Service > Load Balancing > Load Balancer in the KakaoCloud Console.

  2. Select a load balancer from the list.

  3. In the details view, click the Listener tab.

  4. Click the [More] icon and Delete listener.

  5. In the popup, review the listener details and click [Delete].

Add ALB rules​

ALB rules are used exclusively with ALB listeners (HTTP, HTTPS) for Layer 7 Load Balancing settings.
When a listener is created, a default rule is automatically generated and applied last.

  1. Go to Beyond Networking Service > Load Balancing > Load Balancer in the KakaoCloud Console.

  2. Select a load balancer to add L7 rules from the load balancer list.

  3. In the detailed view, select the Listener tab.

  4. Click the [Expand] icon to add rules, and then click the [Add rule] button.

  5. In the pop-up window, configure the rule's order, conditions, and actions.

    Condition types​
    TypeComparison MethodKey ConditionValue Condition
    Host-HeaderChoose between Equals to or Not equals toNo input required- Required
    - Up to 63 characters, excluding subdomains under .
    - Allows uppercase and lowercase letters, numbers, and some special characters (- .)
    - Cannot start with .
    PathChoose from Contains, Not contain, Equals to,
    Not equals to, Starts with, Not start with, Ends with, Not end with    		No input required- Required
    - 1 to 255 characters
    - Allows uppercase and lowercase letters, numbers, and some special characters (- _ . /)
    - Cannot start with -
    HTTP-HeaderChoose from Contains, Not contain, Equals to,
    Not equals to, Starts with, Not start with, Ends with, Not end with    		- Required
    - 1 to 255 characters
    - Allows uppercase and lowercase letters, numbers, and some special characters (- _)    		- Required
    - 1 to 255 characters
    - Allows uppercase and lowercase letters, numbers, and some special characters (( ) - = * . ? ; + : & _)
    File TypeChoose between Equals to or Not equals toNo input required- Required
    - 1 to 255 characters
    - Allows uppercase and lowercase letters, numbers, and some special characters (! @ # $ % ^ & { } _ + - = , . ~ ')
    CookieChoose from Contains, Not contain, Equals to, Not equals to,
    Starts with, Not start with, Ends with, Not end with    		- Required
    - 1 to 32 characters
    - Allows uppercase and lowercase letters, numbers, and some special characters (- _)    		- Required
    - 1 to 255 characters
    - Allows uppercase and lowercase letters, numbers, and some special characters (- / + = _ . \)
    Rule actions​
    Action Methodsettings
    ForwardTarget group
    - HTTP: HTTP, PROXY
    - HTTPS: HTTP
    Redirect to URLProtocol
    - HTTP: HTTP, HTTPS
    - HTTPS: HTTPS

    URL: Maximum 247 characters

    Response Code
    - 301 - Moved Permanently
    - 302 - Found (Default)
    - 303 - See Other
    - 307 - Temporary Redirect
    Redirect prefixProtocol
    - HTTP: HTTP, PROXY
    - HTTPS: HTTPS

    URL: Maximum 247 characters

    Response Code
    - 301 - Moved Permanently
    - 302 - Found (Default)
    - 303 - See Other
    - 307 - Temporary Redirect

  6. In Set condition, enter the condition type, key, value, and comparison method. If needed, click [Add Condition] to add more conditions, or click the delete icon next to the condition to remove it.

  7. In Set actions, select the action and enter the settings for each action, then click the [Add] button.

Manage ALB rules​

View rules​

  1. Go to Beyond Networking Service > Load Balancing > Load Balancer in the KakaoCloud Console.

  2. Select a load balancer from the load balancer list.

  3. In the detailed view, select the Listener tab.

  4. Select a listener.

    CategoryDescription
    Rule orderThe order in which rules are applied; smaller numbers are applied first
    ConditionOperates with AND if different types, or OR if the same type; applies if the final condition is TRUE
    ActionActions taken when the rule is applied

Set rule order​

You can change the order of rules except for the automatically created last rule.

  1. Go to Beyond Networking Service > Load Balancing > Load Balancer in the KakaoCloud Console.

  2. Click the load balancer from the load balancer list.

  3. In the detailed view, select the Listener tab.

  4. Select a listener to change the rule order.

  5. In the listener detailed view, click the [Set rule order] button.

  6. In the window, change the order and click the [Save] button.

Modify rule​

You can change settings for rules except for the automatically created last rule.

  1. Go to Beyond Networking Service > Load Balancing > Load Balancer in the KakaoCloud Console.

  2. Select a load balancer from the load balancer list.

  3. In the detailed view, select the Listener tab.

  4. Select a listener to to edit.

  5. Click the [Edit] icon.

  6. In the pop-up window, modify the information and click [OK].

Delete rule​

  1. Go to Beyond Networking Service > Load Balancing > Load Balancer in the KakaoCloud Console.

  2. Select a load balancer from the load balancer list.

  3. In the detailed view, select the Listener tab.

  4. Select a listener to delete a rule.

  5. In the listener detailed view, click the [Delete] icon.

  6. In the pop-up window, click [Delete].

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