Receiving Helpdesk

what is corosync and pacemaker

by Rosalia Cruickshank DDS Published 3 years ago Updated 3 years ago

Pacemaker is an open source cluster resource manager (CRM), a system that coordinates resources and services that are managed and made highly available by a cluster. In essence, Corosync enables servers to communicate as a cluster, while Pacemaker provides the ability to control how the cluster behaves.

Pacemaker is an open source cluster resource manager (CRM), a system that coordinates resources and services that are managed and made highly available by a cluster. In essence, Corosync enables servers to communicate as a cluster, while Pacemaker provides the ability to control how the cluster behaves.Oct 20, 2015

Full Answer

What is Corosync pacemaker in Linux?

Corosync is an open source Cluster Engine. It is actually a Communication System that enables two or more Linux Cluster nodes to transfer information between them. Corosync Communication System enables all of the nodes to know the exact state of each other at all time. Beside above, how is a pacemaker set up?

How does the Corosync software work?

The software is composed of an executive binary which uses a client-server communication model between libraries and service engines. Loadable modules, called service engines, are loaded into the Corosync Cluster Engine and use the services provided by the Corosync Service Engine internal API.

What is Corosync Cluster Engine?

The Corosync Cluster Engine is an open source implementation of the Totem Single Ring Ordering and Membership protocol. It was originally derived from the OpenAIS project and licensed under the new BSD License. The mission of the Corosync effort is to develop, release, and support a community-defined, open source cluster .

What is Corosync used for?

Corosync is an open source program that provides cluster membership and messaging capabilities, often referred to as the messaging layer, to client servers.

What is the pacemaker and Corosync administration tool?

Pacemaker features two configuration tools for cluster deployment, monitoring, and management. pcs can control all aspects of Pacemaker and the Corosync heartbeat daemon. A command-line based program, pcs can perform the following cluster management tasks: Create and configure a Pacemaker/Corosync cluster.

What is pacemaker in Db2?

Pacemaker is an open-source, high availability cluster manager software integrated with Db2® Advanced Edition and Db2 Standard Edition on Linux®. It provides high availability and disaster recovery capabilities for on-premises deployments and non-container cloud environments, such as Amazon Web Service (AWS).

What is pacemaker in Linux?

Pacemaker is an open source high-availability cluster resource manager software that runs on a set of nodes.

What is Pacemaker in SAP?

How Pacemaker Cluster works with SAP HANA System Replication. SUSE developed in collaboration with SAP the SAPHanaSR solution and released it as part of SLES for SAP Applications. This solution is based on Pacemaker Cluster that is automating failovers between two SAP HANA databases that are mirroring each other.

What is Pacemaker in server?

Pacemaker is a high-availability cluster resource manager. It achieves maximum availability for your cluster services (a.k.a. resources) by detecting and recovering from node- and resource-level failures by making use of the messaging and membership capabilities provided by Corosync.

What is pacemaker database?

The database stores medically useful information about the patients and their pacemaker test results in order to highlight serial changes, which determine whether the pacemaker is still functioning normally, or whether the patient requires further intervention.

What is Corosync in Redhat Cluster?

Corosync: Corosync is an opensource cluster engine which communicates with multiple cluster nodes and updates the cluster information database (cib. xml) frequently . In previous redhat cluster release, “cman” was responsible for cluster interconnect, messaging and membership capabilities.

What is pacemaker AWS?

Pacemaker is a Cluster Resource Manager (CRM) that help running a service in a high availability mode.

What is pacemaker in cloud?

Pacemaker is a high availability Cluster Resource Manager (CRM) that can be used to manage resources, and ensure that they remain available in the event of a node failure.

What is pacemaker in CentOS?

We will create the Active-Passive Cluster or Failover-cluster Nginx web server using Pacemaker on a CentOS 7 system. Pacemaker is an open source cluster manager software that achieves maximum high availability of your services. It's an advanced and scalable HA cluster manager distributed by ClusterLabs.

What is heartbeat in Linux cluster?

Heartbeat is an open source program that provides cluster infrastructure capabilities—cluster membership and messaging—to client servers, which is a critical component in a high availability (HA) server infrastructure.

What is Corosync conf?

The corosync.conf instructs the corosync executive about various parameters needed to control the corosync executive. Empty lines and lines starting with # character are ignored. The configuration file consists of bracketed top level directives.

What is Totem Corosync?

Corosync, more specifically its Totem protocol implementation, defines a maximum number of cluster messages that can be sent during one token rotation. By default, that number is 50, but you may modify this value by setting the window_size parameter in your corosync. conf configuration file.

How do you enable Stonith in a Pacemaker?

Enable STONITH for your HA topology.Enable the cluster STONITH property by using the following command. $ pcs property set stonith-enabled=true.Update the environment for your deployment to set the ibm-openstack. ha. pacemaker. properties. stonith-enabled. value property to true .

How do you activate a Pacemaker?

The broad steps for the cluster configuration include:Install Pacemaker packages on both nodes of the cluster. ... Create the HACLUSTER user ID with. ... Enable and start the pcs services. ... Authenticate pcs with hacluster user. ... Create the cluster. ... Start the cluster. ... Enable the cluster to auto-start after reboot.

Terms and abbreviations

Corosync allows any number of servers to be part of the cluster using any number of fault-tolerant configurations (active/passive, active/active, N+1, etc.)

Cluster configuration

On OpenSUSE servers OCF resource definitions can be found in /usr/lib/ocf/resource.d/.

Features

The Corosync Cluster Engine is a group communication system with additional features for implementing high availability within applications.

Architecture

The software is composed of an executive binary which uses a client-server communication model between libraries and service engines. Loadable modules, called service engines, are loaded into the Corosync Cluster Engine and use the services provided by the Corosync Service Engine internal API.

History

The project was formally announced in July 2008 via a conference paper at the Ottawa Linux Symposium. The source code of OpenAIS was refactored such that the core infrastructure components were placed into Corosync and the SA Forum APIs were kept in OpenAIS.

Can IPMI be applied to any fencing device?

This Parameter can be applied to any Fencing Device. IPMI above is only an example.

Does one fencing device delay?

this will make it more likely, that one fencing device will have a delay. It is at that moment irrelevant which node fences which node, as there is no way for a Cluster without Quorum to determine the right node to be fenced.

image

Overview

  • Corosyncallows any number of servers to be part of the cluster using any number of fault-tolerant configurations (active/passive, active/active, N+1, etc.) Corosyncprovides messaging between servers within the same cluster. Pacemakermanages the resources and applications on a node within the cluster. OpenAIS can be thought of as the API between Cor...
See more on earlruby.org

Features

Architecture

History

The Corosync Cluster Engine is an open source implementation of the Totem Single Ring Ordering and Membership protocol. It was originally derived from the OpenAIS project and licensed under the new BSD License. The mission of the Corosync effort is to develop, release, and support a community-defined, open source cluster.

See also

The Corosync Cluster Engine is a group communication system with additional features for implementing high availability within applications.
The project provides four C API features:
• A closed process group communication model with virtual synchrony guarantees for creating replicated state machines.

External links

The software is composed of an executive binary which uses a client-server communication model between libraries and service engines. Loadable modules, called service engines, are loaded into the Corosync Cluster Engine and use the services provided by the Corosync Service Engine internal API.
The services provided by the Corosync Service Engine internal API are:

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 1 2 3 4 5 6 7 8 9
8.3.21PHP Version2.53sRequest Duration2MBMemory UsageGET {post}Route
  • warninglog[13:26:02] LOG.warning: Creation of dynamic property Barryvdh\Debugbar\DataFormatter\QueryFormatter:...
  • warninglog[13:26:02] LOG.warning: Creation of dynamic property Barryvdh\Debugbar\DataFormatter\QueryFormatter:...
  • warninglog[13:26:02] LOG.warning: Callables of the form ["Swift_SmtpTransport", "Swift_Transport_EsmtpTranspor...
  • warninglog[13:26:02] LOG.warning: Creation of dynamic property Barryvdh\Debugbar\DataFormatter\SimpleFormatter...
  • warninglog[13:26:02] LOG.warning: Creation of dynamic property Barryvdh\Debugbar\DataFormatter\SimpleFormatter...
  • warninglog[13:26:02] LOG.warning: json_decode(): Passing null to parameter #1 ($json) of type string is deprec...
  • warninglog[13:26:02] LOG.warning: json_decode(): Passing null to parameter #1 ($json) of type string is deprec...
  • Booting (14.41ms)
  • Application (2.51s)
  • 1 x Application (99.41%)
    2.51s
    1 x Booting (0.57%)
    14.41ms
    7 templates were rendered
    • themes.DevBlog.content.post (resources/views/themes/DevBlog/content/post.blade.php)34blade
      Params
      0
      post
      1
      postContent
      2
      author
      3
      updated_at
      4
      bing_rich_snippet_text
      5
      bing_rich_snippet_link
      6
      bing_related_keywords
      7
      google_related_keywords
      8
      bing_news_title
      9
      bing_news_description
      10
      bing_videos
      11
      bing_images
      12
      bing_search_result_title
      13
      bing_search_result_description
      14
      bing_search_result_url
      15
      bing_paa_questions
      16
      bing_paa_answers
      17
      bing_slider_faq_questions
      18
      bing_slider_faq_answers
      19
      bing_pop_faq_questions
      20
      bing_pop_faq_answers
      21
      bing_tab_faq_questions
      22
      bing_tab_faq_answers
      23
      google_faq_questions
      24
      google_faq_answers
      25
      google_rich_snippet
      26
      google_search_result
      27
      indexedArray
      28
      total_images
      29
      total_videos
      30
      settings
      31
      url_current
      32
      menus
      33
      sidebar
    • themes.DevBlog.layouts.master (resources/views/themes/DevBlog/layouts/master.blade.php)41blade
      Params
      0
      __env
      1
      app
      2
      errors
      3
      post
      4
      postContent
      5
      author
      6
      updated_at
      7
      bing_rich_snippet_text
      8
      bing_rich_snippet_link
      9
      bing_related_keywords
      10
      google_related_keywords
      11
      bing_news_title
      12
      bing_news_description
      13
      bing_videos
      14
      bing_images
      15
      bing_search_result_title
      16
      bing_search_result_description
      17
      bing_search_result_url
      18
      bing_paa_questions
      19
      bing_paa_answers
      20
      bing_slider_faq_questions
      21
      bing_slider_faq_answers
      22
      bing_pop_faq_questions
      23
      bing_pop_faq_answers
      24
      bing_tab_faq_questions
      25
      bing_tab_faq_answers
      26
      google_faq_questions
      27
      google_faq_answers
      28
      google_rich_snippet
      29
      google_search_result
      30
      indexedArray
      31
      total_images
      32
      total_videos
      33
      settings
      34
      url_current
      35
      menus
      36
      sidebar
      37
      i
      38
      __currentLoopData
      39
      loop
      40
      item
    • themes.DevBlog.panels.head (resources/views/themes/DevBlog/panels/head.blade.php)41blade
      Params
      0
      __env
      1
      app
      2
      errors
      3
      post
      4
      postContent
      5
      author
      6
      updated_at
      7
      bing_rich_snippet_text
      8
      bing_rich_snippet_link
      9
      bing_related_keywords
      10
      google_related_keywords
      11
      bing_news_title
      12
      bing_news_description
      13
      bing_videos
      14
      bing_images
      15
      bing_search_result_title
      16
      bing_search_result_description
      17
      bing_search_result_url
      18
      bing_paa_questions
      19
      bing_paa_answers
      20
      bing_slider_faq_questions
      21
      bing_slider_faq_answers
      22
      bing_pop_faq_questions
      23
      bing_pop_faq_answers
      24
      bing_tab_faq_questions
      25
      bing_tab_faq_answers
      26
      google_faq_questions
      27
      google_faq_answers
      28
      google_rich_snippet
      29
      google_search_result
      30
      indexedArray
      31
      total_images
      32
      total_videos
      33
      settings
      34
      url_current
      35
      menus
      36
      sidebar
      37
      i
      38
      __currentLoopData
      39
      loop
      40
      item
    • themes.DevBlog.panels.header (resources/views/themes/DevBlog/panels/header.blade.php)41blade
      Params
      0
      __env
      1
      app
      2
      errors
      3
      post
      4
      postContent
      5
      author
      6
      updated_at
      7
      bing_rich_snippet_text
      8
      bing_rich_snippet_link
      9
      bing_related_keywords
      10
      google_related_keywords
      11
      bing_news_title
      12
      bing_news_description
      13
      bing_videos
      14
      bing_images
      15
      bing_search_result_title
      16
      bing_search_result_description
      17
      bing_search_result_url
      18
      bing_paa_questions
      19
      bing_paa_answers
      20
      bing_slider_faq_questions
      21
      bing_slider_faq_answers
      22
      bing_pop_faq_questions
      23
      bing_pop_faq_answers
      24
      bing_tab_faq_questions
      25
      bing_tab_faq_answers
      26
      google_faq_questions
      27
      google_faq_answers
      28
      google_rich_snippet
      29
      google_search_result
      30
      indexedArray
      31
      total_images
      32
      total_videos
      33
      settings
      34
      url_current
      35
      menus
      36
      sidebar
      37
      i
      38
      __currentLoopData
      39
      loop
      40
      item
    • themes.DevBlog.panels.navbar (resources/views/themes/DevBlog/panels/navbar.blade.php)41blade
      Params
      0
      __env
      1
      app
      2
      errors
      3
      post
      4
      postContent
      5
      author
      6
      updated_at
      7
      bing_rich_snippet_text
      8
      bing_rich_snippet_link
      9
      bing_related_keywords
      10
      google_related_keywords
      11
      bing_news_title
      12
      bing_news_description
      13
      bing_videos
      14
      bing_images
      15
      bing_search_result_title
      16
      bing_search_result_description
      17
      bing_search_result_url
      18
      bing_paa_questions
      19
      bing_paa_answers
      20
      bing_slider_faq_questions
      21
      bing_slider_faq_answers
      22
      bing_pop_faq_questions
      23
      bing_pop_faq_answers
      24
      bing_tab_faq_questions
      25
      bing_tab_faq_answers
      26
      google_faq_questions
      27
      google_faq_answers
      28
      google_rich_snippet
      29
      google_search_result
      30
      indexedArray
      31
      total_images
      32
      total_videos
      33
      settings
      34
      url_current
      35
      menus
      36
      sidebar
      37
      i
      38
      __currentLoopData
      39
      loop
      40
      item
    • themes.DevBlog.panels.footer (resources/views/themes/DevBlog/panels/footer.blade.php)41blade
      Params
      0
      __env
      1
      app
      2
      errors
      3
      post
      4
      postContent
      5
      author
      6
      updated_at
      7
      bing_rich_snippet_text
      8
      bing_rich_snippet_link
      9
      bing_related_keywords
      10
      google_related_keywords
      11
      bing_news_title
      12
      bing_news_description
      13
      bing_videos
      14
      bing_images
      15
      bing_search_result_title
      16
      bing_search_result_description
      17
      bing_search_result_url
      18
      bing_paa_questions
      19
      bing_paa_answers
      20
      bing_slider_faq_questions
      21
      bing_slider_faq_answers
      22
      bing_pop_faq_questions
      23
      bing_pop_faq_answers
      24
      bing_tab_faq_questions
      25
      bing_tab_faq_answers
      26
      google_faq_questions
      27
      google_faq_answers
      28
      google_rich_snippet
      29
      google_search_result
      30
      indexedArray
      31
      total_images
      32
      total_videos
      33
      settings
      34
      url_current
      35
      menus
      36
      sidebar
      37
      i
      38
      __currentLoopData
      39
      loop
      40
      item
    • themes.DevBlog.panels.scripts (resources/views/themes/DevBlog/panels/scripts.blade.php)41blade
      Params
      0
      __env
      1
      app
      2
      errors
      3
      post
      4
      postContent
      5
      author
      6
      updated_at
      7
      bing_rich_snippet_text
      8
      bing_rich_snippet_link
      9
      bing_related_keywords
      10
      google_related_keywords
      11
      bing_news_title
      12
      bing_news_description
      13
      bing_videos
      14
      bing_images
      15
      bing_search_result_title
      16
      bing_search_result_description
      17
      bing_search_result_url
      18
      bing_paa_questions
      19
      bing_paa_answers
      20
      bing_slider_faq_questions
      21
      bing_slider_faq_answers
      22
      bing_pop_faq_questions
      23
      bing_pop_faq_answers
      24
      bing_tab_faq_questions
      25
      bing_tab_faq_answers
      26
      google_faq_questions
      27
      google_faq_answers
      28
      google_rich_snippet
      29
      google_search_result
      30
      indexedArray
      31
      total_images
      32
      total_videos
      33
      settings
      34
      url_current
      35
      menus
      36
      sidebar
      37
      i
      38
      __currentLoopData
      39
      loop
      40
      item
    uri
    GET {post}
    middleware
    web, checkdate
    as
    post.show
    controller
    App\Http\Controllers\Frontend\json_data\PostController@show
    namespace
    where
    file
    app/Http/Controllers/Frontend/json_data/PostController.php:18-166
    7 statements were executed2.49s
    • select * from `posts` where `published_at` <= '2025-06-21 13:26:02' and `slug` = 'what-is-corosync-and-pacemaker' and `posts`.`deleted_at` is null limit 1
      5.29ms/app/Providers/RouteServiceProvider.php:54receivinghelpdeskask
      Metadata
      Bindings
      • 0. 2025-06-21 13:26:02
      • 1. what-is-corosync-and-pacemaker
      Backtrace
      • 15. /app/Providers/RouteServiceProvider.php:54
      • 18. /vendor/laravel/framework/src/Illuminate/Routing/Router.php:842
      • 19. Route binding:39
      • 20. /vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php:167
      • 21. /vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/VerifyCsrfToken.php:78
    • select * from `json_post_contents` where `json_post_contents`.`post_id` = 187024 and `json_post_contents`.`post_id` is not null and `rewrite_id` = 0
      13.53msmiddleware::checkdate:30receivinghelpdeskask
      Metadata
      Bindings
      • 0. 187024
      • 1. 0
      Backtrace
      • 19. middleware::checkdate:30
      • 20. /vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php:167
      • 21. /vendor/laravel/jetstream/src/Http/Middleware/ShareInertiaData.php:61
      • 22. /vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php:167
      • 23. /vendor/laravel/framework/src/Illuminate/Routing/Middleware/SubstituteBindings.php:50
    • select * from `nova_menu_menus` where `slug` = 'header' limit 1
      3.67ms/vendor/outl1ne/nova-menu-builder/src/helpers.php:32receivinghelpdeskask
      Metadata
      Bindings
      • 0. header
      Backtrace
      • 15. /vendor/outl1ne/nova-menu-builder/src/helpers.php:32
      • 17. /vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
      • 18. /vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:45
      • 19. /vendor/laravel/framework/src/Illuminate/Routing/Route.php:261
      • 20. /vendor/laravel/framework/src/Illuminate/Routing/Route.php:205
    • select * from `nova_menu_menu_items` where `nova_menu_menu_items`.`menu_id` = 1 and `nova_menu_menu_items`.`menu_id` is not null and `parent_id` is null order by `parent_id` asc, `order` asc, `name` asc
      3.43ms/vendor/outl1ne/nova-menu-builder/src/Models/Menu.php:35receivinghelpdeskask
      Metadata
      Bindings
      • 0. 1
      Backtrace
      • 19. /vendor/outl1ne/nova-menu-builder/src/Models/Menu.php:35
      • 20. /vendor/outl1ne/nova-menu-builder/src/helpers.php:33
      • 22. /vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
      • 23. /vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:45
      • 24. /vendor/laravel/framework/src/Illuminate/Routing/Route.php:261
    • select * from `nova_menu_menu_items` where `nova_menu_menu_items`.`parent_id` in (1) order by `order` asc
      1.28ms/vendor/outl1ne/nova-menu-builder/src/Models/Menu.php:35receivinghelpdeskask
      Metadata
      Backtrace
      • 24. /vendor/outl1ne/nova-menu-builder/src/Models/Menu.php:35
      • 25. /vendor/outl1ne/nova-menu-builder/src/helpers.php:33
      • 27. /vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
      • 28. /vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:45
      • 29. /vendor/laravel/framework/src/Illuminate/Routing/Route.php:261
    • select `id`, `post_title`, `slug` from `posts` where `status` = 'publish' and `posts`.`deleted_at` is null order by RAND() limit 10
      2.46s/app/View/Composers/SidebarView.php:22receivinghelpdeskask
      Metadata
      Bindings
      • 0. publish
      Backtrace
      • 14. /app/View/Composers/SidebarView.php:22
      • 15. /app/View/Composers/SidebarView.php:12
      • 16. /vendor/laravel/framework/src/Illuminate/View/Concerns/ManagesEvents.php:124
      • 17. /vendor/laravel/framework/src/Illuminate/View/Concerns/ManagesEvents.php:162
      • 20. /vendor/laravel/framework/src/Illuminate/View/Concerns/ManagesEvents.php:177
    • select * from `fake_users` where `fake_users`.`id` = 39863 limit 1
      630μsview::2dd102cf0462e89a4d4d8bc77355d767652bf9aa:15receivinghelpdeskask
      Metadata
      Bindings
      • 0. 39863
      Backtrace
      • 21. view::2dd102cf0462e89a4d4d8bc77355d767652bf9aa:15
      • 23. /vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:108
      • 24. /vendor/laravel/framework/src/Illuminate/View/Engines/PhpEngine.php:58
      • 25. /vendor/livewire/livewire/src/ComponentConcerns/RendersLivewireComponents.php:69
      • 26. /vendor/laravel/framework/src/Illuminate/View/Engines/CompilerEngine.php:61
    App\Models\FakeUser
    1
    Outl1ne\MenuBuilder\Models\MenuItem
    1
    Outl1ne\MenuBuilder\Models\Menu
    1
    App\Models\JsonPostContent
    1
    App\Models\Post
    11
        _token
        mkdUMTxcnTJsWAhuoIDG7e51B9nHB8Gf3uqdpOoy
        _previous
        array:1 [ "url" => "https://receivinghelpdesk.com/ask/what-is-corosync-and-pacemaker" ]
        _flash
        array:2 [ "old" => [] "new" => [] ]
        PHPDEBUGBAR_STACK_DATA
        []
        path_info
        /what-is-corosync-and-pacemaker
        status_code
        200
        
        status_text
        OK
        format
        html
        content_type
        text/html; charset=UTF-8
        request_query
        []
        
        request_request
        []
        
        request_headers
        0 of 0
        array:25 [ "cookie" => array:1 [ 0 => "_pk_id.64.7c30=20d463f20a15d8e4.1750492557.; _pk_ses.64.7c30=1; XSRF-TOKEN=eyJpdiI6IitHQXZlMklJLzFUekowdlN0YTlPUHc9PSIsInZhbHVlIjoiclI1YnUydDgzbUxOWVZwa3MzUVRKSTI2MmxNdW1lM3owci82Z0VyOE5BbFBFZHkrdzAvZSsxV2M3Qm5YVklJbEIwVEc0ajhldlpCbDM0YkJPSk9CRTZjTUhTdDBZdUdwYTRZUzN3cWx0cEZYTmJ4NTFYbXFKQVVmNHMycFRHK2EiLCJtYWMiOiI1ZWRhMThiMzE4MzRjMTljNDAzNGQyNzNmZmU1YjU0MzUzNWNjZGQzOWY4ZTViYzAyYzk4ODJkMWQwOWIyNDNlIiwidGFnIjoiIn0%3D; askhelpdesk_session=eyJpdiI6Ik41UnNRaldNSkRRY3hPY0YydjEzdEE9PSIsInZhbHVlIjoiWDA4dWk2NzFkZFllUXM2RE1weVprRUFyVExXeDZmeEg0Vm02TFhXMW5ENlpYZlJVNmRRaWhGWDVmS1JnVmJoZGNWNHczK3UyMXgycDluOXkzOVV1Uk1PcG00dEJmM0QyUkI2SFdPbU5UVDVYandUNWZXNGpOc0c2SlZabFJKSEQiLCJtYWMiOiI2ZDJhOTNkMzgzMzI2YTM2YmY5OTdjZGViN2IwMWNjZDhlMGVjOTE1NGU0N2VhNmRjYzhmMTMzNDVmMWE3ZjZkIiwidGFnIjoiIn0%3D_pk_id.64.7c30=20d463f20a15d8e4.1750492557.; _pk_ses.64.7c30=1; XSRF-TOKEN=eyJpdiI6IitHQXZlMklJLzFUekowdlN0YTlPUHc9PSIsInZhbHVlIjoiclI1YnUydDgzbUxOWVZwa3MzUVRKS" ] "cf-ipcountry" => array:1 [ 0 => "US" ] "cf-connecting-ip" => array:1 [ 0 => "216.73.216.243" ] "cdn-loop" => array:1 [ 0 => "cloudflare; loops=1" ] "sec-fetch-mode" => array:1 [ 0 => "navigate" ] "sec-fetch-site" => array:1 [ 0 => "none" ] "accept" => array:1 [ 0 => "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7" ] "user-agent" => array:1 [ 0 => "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)" ] "upgrade-insecure-requests" => array:1 [ 0 => "1" ] "sec-ch-ua-platform" => array:1 [ 0 => ""Windows"" ] "sec-ch-ua-mobile" => array:1 [ 0 => "?0" ] "sec-ch-ua" => array:1 [ 0 => ""Chromium";v="130", "HeadlessChrome";v="130", "Not?A_Brand";v="99"" ] "cache-control" => array:1 [ 0 => "no-cache" ] "pragma" => array:1 [ 0 => "no-cache" ] "accept-encoding" => array:1 [ 0 => "gzip, br" ] "cf-ray" => array:1 [ 0 => "9531f272a83deaf5-ORD" ] "priority" => array:1 [ 0 => "u=0, i" ] "sec-fetch-dest" => array:1 [ 0 => "document" ] "sec-fetch-user" => array:1 [ 0 => "?1" ] "cf-visitor" => array:1 [ 0 => "{"scheme":"https"}" ] "connection" => array:1 [ 0 => "close" ] "x-forwarded-proto" => array:1 [ 0 => "https" ] "x-forwarded-for" => array:1 [ 0 => "216.73.216.243, 172.71.255.104" ] "x-server-addr" => array:1 [ 0 => "154.12.239.204" ] "host" => array:1 [ 0 => "receivinghelpdesk.com" ] ]
        request_server
        0 of 0
        array:56 [ "USER" => "runcloud" "HOME" => "/home/runcloud" "SCRIPT_NAME" => "/ask/index.php" "REQUEST_URI" => "/ask/what-is-corosync-and-pacemaker" "QUERY_STRING" => "" "REQUEST_METHOD" => "GET" "SERVER_PROTOCOL" => "HTTP/1.0" "GATEWAY_INTERFACE" => "CGI/1.1" "REDIRECT_URL" => "/ask/what-is-corosync-and-pacemaker" "REMOTE_PORT" => "48466" "SCRIPT_FILENAME" => "/home/runcloud/webapps/ReceivingHelpDesk/ask/index.php" "SERVER_ADMIN" => "you@example.com" "CONTEXT_DOCUMENT_ROOT" => "/home/runcloud/webapps/ReceivingHelpDesk/" "CONTEXT_PREFIX" => "" "REQUEST_SCHEME" => "http" "DOCUMENT_ROOT" => "/home/runcloud/webapps/ReceivingHelpDesk/" "REMOTE_ADDR" => "172.71.255.104" "SERVER_PORT" => "80" "SERVER_ADDR" => "127.0.0.1" "SERVER_NAME" => "receivinghelpdesk.com" "SERVER_SOFTWARE" => "Apache/2.4.63 (Unix) OpenSSL/1.1.1f" "SERVER_SIGNATURE" => "" "LD_LIBRARY_PATH" => "/RunCloud/Packages/apache2-rc/lib" "PATH" => "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" "HTTP_COOKIE" => "_pk_id.64.7c30=20d463f20a15d8e4.1750492557.; _pk_ses.64.7c30=1; XSRF-TOKEN=eyJpdiI6IitHQXZlMklJLzFUekowdlN0YTlPUHc9PSIsInZhbHVlIjoiclI1YnUydDgzbUxOWVZwa3MzUVRKSTI2MmxNdW1lM3owci82Z0VyOE5BbFBFZHkrdzAvZSsxV2M3Qm5YVklJbEIwVEc0ajhldlpCbDM0YkJPSk9CRTZjTUhTdDBZdUdwYTRZUzN3cWx0cEZYTmJ4NTFYbXFKQVVmNHMycFRHK2EiLCJtYWMiOiI1ZWRhMThiMzE4MzRjMTljNDAzNGQyNzNmZmU1YjU0MzUzNWNjZGQzOWY4ZTViYzAyYzk4ODJkMWQwOWIyNDNlIiwidGFnIjoiIn0%3D; askhelpdesk_session=eyJpdiI6Ik41UnNRaldNSkRRY3hPY0YydjEzdEE9PSIsInZhbHVlIjoiWDA4dWk2NzFkZFllUXM2RE1weVprRUFyVExXeDZmeEg0Vm02TFhXMW5ENlpYZlJVNmRRaWhGWDVmS1JnVmJoZGNWNHczK3UyMXgycDluOXkzOVV1Uk1PcG00dEJmM0QyUkI2SFdPbU5UVDVYandUNWZXNGpOc0c2SlZabFJKSEQiLCJtYWMiOiI2ZDJhOTNkMzgzMzI2YTM2YmY5OTdjZGViN2IwMWNjZDhlMGVjOTE1NGU0N2VhNmRjYzhmMTMzNDVmMWE3ZjZkIiwidGFnIjoiIn0%3D_pk_id.64.7c30=20d463f20a15d8e4.1750492557.; _pk_ses.64.7c30=1; XSRF-TOKEN=eyJpdiI6IitHQXZlMklJLzFUekowdlN0YTlPUHc9PSIsInZhbHVlIjoiclI1YnUydDgzbUxOWVZwa3MzUVRKS" "HTTP_CF_IPCOUNTRY" => "US" "HTTP_CF_CONNECTING_IP" => "216.73.216.243" "HTTP_CDN_LOOP" => "cloudflare; loops=1" "HTTP_SEC_FETCH_MODE" => "navigate" "HTTP_SEC_FETCH_SITE" => "none" "HTTP_ACCEPT" => "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7" "HTTP_USER_AGENT" => "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)" "HTTP_UPGRADE_INSECURE_REQUESTS" => "1" "HTTP_SEC_CH_UA_PLATFORM" => ""Windows"" "HTTP_SEC_CH_UA_MOBILE" => "?0" "HTTP_SEC_CH_UA" => ""Chromium";v="130", "HeadlessChrome";v="130", "Not?A_Brand";v="99"" "HTTP_CACHE_CONTROL" => "no-cache" "HTTP_PRAGMA" => "no-cache" "HTTP_ACCEPT_ENCODING" => "gzip, br" "HTTP_CF_RAY" => "9531f272a83deaf5-ORD" "HTTP_PRIORITY" => "u=0, i" "HTTP_SEC_FETCH_DEST" => "document" "HTTP_SEC_FETCH_USER" => "?1" "HTTP_CF_VISITOR" => "{"scheme":"https"}" "HTTP_CONNECTION" => "close" "HTTP_X_FORWARDED_PROTO" => "https" "HTTP_X_FORWARDED_FOR" => "216.73.216.243, 172.71.255.104" "HTTP_X_SERVER_ADDR" => "154.12.239.204" "HTTP_HOST" => "receivinghelpdesk.com" "HTTPS" => "on" "REDIRECT_STATUS" => "200" "REDIRECT_HTTPS" => "on" "FCGI_ROLE" => "RESPONDER" "PHP_SELF" => "/ask/index.php" "REQUEST_TIME_FLOAT" => 1750492562.3643 "REQUEST_TIME" => 1750492562 ]
        request_cookies
        0 of 0
        array:4 [ "_pk_id_64_7c30" => null "_pk_ses_64_7c30" => null "XSRF-TOKEN" => "mkdUMTxcnTJsWAhuoIDG7e51B9nHB8Gf3uqdpOoy" "askhelpdesk_session" => "BTvZ1TQH4DXaVQtdKSFvDBNbw1gg1FBJef0CkTHz" ]
        response_headers
        0 of 0
        array:7 [ "content-type" => array:1 [ 0 => "text/html; charset=UTF-8" ] "cache-control" => array:1 [ 0 => "private, must-revalidate" ] "date" => array:1 [ 0 => "Sat, 21 Jun 2025 07:56:02 GMT" ] "pragma" => array:1 [ 0 => "no-cache" ] "expires" => array:1 [ 0 => -1 ] "set-cookie" => array:2 [ 0 => "XSRF-TOKEN=eyJpdiI6InlieDNhN2ZuejhEdVBtalNOSFJvelE9PSIsInZhbHVlIjoiT1Z3bDJYeUlHb3ErSWJxcWFiOGJsUmRYRlE4MXFlcUVDSDd3Z0Z6MXRFRXJSSTdySkF2VC9ybXd0SGNpQ1JVblY2bG1mVzFNUDdheW9jR3oyWVFqYmpoTURybCtjUlVWZHRDR1BxN0k4NFpaNHVTT0N0dVFXeFhaaWxDa1hhZ2QiLCJtYWMiOiIxODU3NWRhZDE2NGYxYTRjOTA2MDc3NDBiODM2OWZjYjlhYzZhZTM1ZmY4ODM5YmZmYTQ3OTM1ODM4ODk2MmFlIiwidGFnIjoiIn0%3D; expires=Sat, 21-Jun-2025 09:56:04 GMT; Max-Age=7200; path=/; samesite=laxXSRF-TOKEN=eyJpdiI6InlieDNhN2ZuejhEdVBtalNOSFJvelE9PSIsInZhbHVlIjoiT1Z3bDJYeUlHb3ErSWJxcWFiOGJsUmRYRlE4MXFlcUVDSDd3Z0Z6MXRFRXJSSTdySkF2VC9ybXd0SGNpQ1JVblY2bG1mV" 1 => "askhelpdesk_session=eyJpdiI6Ind4OFNYb2hlcTZXK29IcVBYK0xKNFE9PSIsInZhbHVlIjoiZFN1bnRlM29JQmYzUjlwbWRXeEMyTllGS1RWSEdBZE9jN2EvYmtNM1JpNCtNNlFvSlA3eVBOM2lpaEdOaGE1U1FkYWJyb2JZZ2NObDhvOWt4N01sN3VPNWU4K2dTK1NZaGVTT1pIY1RwR3U5RUp2dGljMWpCN1laL0RhV05oSGwiLCJtYWMiOiIwNzExMjI3YTc0ZTMzMmM3ZjU0YTYyNmJlYWFkY2U4ZDkwOTI5ZTAxYTcyMDJhMGEyMzM4ZTY5NjQ4OGNhOGY3IiwidGFnIjoiIn0%3D; expires=Sat, 21-Jun-2025 09:56:04 GMT; Max-Age=7200; path=/; httponly; samesite=laxaskhelpdesk_session=eyJpdiI6Ind4OFNYb2hlcTZXK29IcVBYK0xKNFE9PSIsInZhbHVlIjoiZFN1bnRlM29JQmYzUjlwbWRXeEMyTllGS1RWSEdBZE9jN2EvYmtNM1JpNCtNNlFvSlA3eVBOM2lpaEdOaGE1" ] "Set-Cookie" => array:2 [ 0 => "XSRF-TOKEN=eyJpdiI6InlieDNhN2ZuejhEdVBtalNOSFJvelE9PSIsInZhbHVlIjoiT1Z3bDJYeUlHb3ErSWJxcWFiOGJsUmRYRlE4MXFlcUVDSDd3Z0Z6MXRFRXJSSTdySkF2VC9ybXd0SGNpQ1JVblY2bG1mVzFNUDdheW9jR3oyWVFqYmpoTURybCtjUlVWZHRDR1BxN0k4NFpaNHVTT0N0dVFXeFhaaWxDa1hhZ2QiLCJtYWMiOiIxODU3NWRhZDE2NGYxYTRjOTA2MDc3NDBiODM2OWZjYjlhYzZhZTM1ZmY4ODM5YmZmYTQ3OTM1ODM4ODk2MmFlIiwidGFnIjoiIn0%3D; expires=Sat, 21-Jun-2025 09:56:04 GMT; path=/XSRF-TOKEN=eyJpdiI6InlieDNhN2ZuejhEdVBtalNOSFJvelE9PSIsInZhbHVlIjoiT1Z3bDJYeUlHb3ErSWJxcWFiOGJsUmRYRlE4MXFlcUVDSDd3Z0Z6MXRFRXJSSTdySkF2VC9ybXd0SGNpQ1JVblY2bG1mV" 1 => "askhelpdesk_session=eyJpdiI6Ind4OFNYb2hlcTZXK29IcVBYK0xKNFE9PSIsInZhbHVlIjoiZFN1bnRlM29JQmYzUjlwbWRXeEMyTllGS1RWSEdBZE9jN2EvYmtNM1JpNCtNNlFvSlA3eVBOM2lpaEdOaGE1U1FkYWJyb2JZZ2NObDhvOWt4N01sN3VPNWU4K2dTK1NZaGVTT1pIY1RwR3U5RUp2dGljMWpCN1laL0RhV05oSGwiLCJtYWMiOiIwNzExMjI3YTc0ZTMzMmM3ZjU0YTYyNmJlYWFkY2U4ZDkwOTI5ZTAxYTcyMDJhMGEyMzM4ZTY5NjQ4OGNhOGY3IiwidGFnIjoiIn0%3D; expires=Sat, 21-Jun-2025 09:56:04 GMT; path=/; httponlyaskhelpdesk_session=eyJpdiI6Ind4OFNYb2hlcTZXK29IcVBYK0xKNFE9PSIsInZhbHVlIjoiZFN1bnRlM29JQmYzUjlwbWRXeEMyTllGS1RWSEdBZE9jN2EvYmtNM1JpNCtNNlFvSlA3eVBOM2lpaEdOaGE1" ] ]
        session_attributes
        0 of 0
        array:4 [ "_token" => "mkdUMTxcnTJsWAhuoIDG7e51B9nHB8Gf3uqdpOoy" "_previous" => array:1 [ "url" => "https://receivinghelpdesk.com/ask/what-is-corosync-and-pacemaker" ] "_flash" => array:2 [ "old" => [] "new" => [] ] "PHPDEBUGBAR_STACK_DATA" => [] ]