Pandora: Documentation en: Services
- 1 Service Monitoring
- 1.1 Introduction
- 1.2 Services under Pandora FMS
- 1.2.1 How Services work under Pandora FMS
- 1.2.2 Creating a New Service
- 1.2.3 Service Visualization
- 1.2.4 How to read service values
- 1.2.5 Service cascade protection
- 1.2.6 Root cause analysis
- 1.2.7 Service grouping
- 1.2.8 Service monitoring examples
- 1.3 Pandora Server
1 Service Monitoring
A service is a way to group IT resources based on their features.
A service could be an official website, a CRM system, a support application, or even printers. Services are logical groups which can include hosts, routers, switches, firewalls, CRMs, ERPs, websites and of course, different other services.
In Pandora FMS, services are represented as a group of monitored elements (modules, agents or other services) whose individual status affects in a certain way the global performance of the service provided.
1.2 Services under Pandora FMS
1.2.1 How Services work under Pandora FMS
Basic monitoring in Pandora FMS consists of collecting metrics from different sources, representing them as monitors (modules).
Service monitoring allows to group these modules, so that, by playing with certain ranges based on failure build-up, groups of different types of elements and their relationship in a larger and general service can be monitored.
In short, service monitoring allows to check the status of a global service. You will be able to know if our service is being provided normally (green), degraded (yellow) or if it is not being provided altogether (red).
This is an example to better understand what service monitoring is all about.
Suppose you want to monitor a web application, which you have balanced through a series of redundant elements. The infrastructure on which the application is based on could consist of the following elements:
- Two routers in HA.
- Two switches in HA.
- 20 Apache Web Servers.
- Four Weblogic Appliance Servers.
- One MySQL Cluster consisting of two Storage and two SQL Processing Nodes.
The goal is to find out whether the web application works properly. That is the final assessment by customers, whether the application works or not.
The need to monitor services as something "abstract" arises when faced with the following question:
What happens to an application if a non-critical element fails?
For example, if one of the twenty Apache servers were to fail, in theory it could not be warned, because the purpose of so much redundancy is having troublesome situations covered. But then, which one should be warned about?, all of them or some? What is the rule for warning?
You might think that Pandora FMS should only warn you if a highly critical element fails (for example a router) or if several Apache servers fail.
Monitoring through services in Pandora FMSfeature is here to solve all these doubts.
The services in Pandora FMS help you to:
- Limit the number of received alerts. You will receive alerts about situations that compromise the reliability of the services you provide.
- Track the compliance level.
- Simplify the monitoring display of your infrastructure.
To achieve this, monitor every element that could negatively affect your application.
Through Pandora FMS console, define a service tree in which to indicate both the elements that affect your application, as well as their impact degree.
All elements added to the service trees will correspond to information that is already being monitored, either in the form of modules, specific agents or other services.
To indicate the degree to which the status of each element affects the overall status, a weight sum system will be used, so that the most important ones (with more weight) will be more relevant to adjust the overall status of the whole service to an incorrect status before less important elements (with less weight).
- Switches and routers: 5 points each when in critical, and 3 points if in warning.
- WEB servers: 1.2 points for each one in critical, warning status is disregarded.
- WebLogic Servers: 2 points each in critical.
- MySQL Cluster: 5 points for each node in critical and 3 points in warning.
|Element type||Weight assignment|
A warning threshold of 4 for service, and a critical threshold of 6 are set. That way, and assuming there are no issues, the service would be "OK" if all the monitored elements are OK or not important enough to cause deficiencies when providing the service.
But suppose that one (1) Apache web server fails:
- 1 x Apache server in CRITICAL x 1.2 points = 1.2 because 1.2 < 4 (Warning), the service is still in OK status.
The weight contribution will be:
2 x 0 (routers OK) + 2 x 0 (switches OK) + 19 x 0 (apache OK) + 1 x 1.2 (apache CRIT) + 4 x 0 (weblogic OK) + 1 x 0 (mysql OK) Total: 1.2 --> The service will be NORMAL
Now this is what happens if a WEB server and a Weblogic fail:
- 1 x Apache Server in CRITICAL x 1.2 pto = 1.2
- 1 x Weblogic Server in CRITICAL x 2 = 2
Total, 3,2 is still < 4, so the server remains in OK status, it is still working, it is not necessary to take technical action immediately.
The weight contribution will be:
2 x 0 (routers OK) + 2 x 0 (switches OK) + 19 x 0 (apache OK) + 1 x 1.2 (apache CRIT) + 3 x 0 (weblogic OK) + 1 x 2 (weblogic CRIT) + 1 x 0 (mysql OK) Total: 3.2 --> The service will be NORMAL
This is what happens if two WEB servers and a WEblogic fail:
- 2 x Apache Server in CRITICAL x 1.2 points = 2.4
- 1 x Weblogic Server in CRITICAL x 2 = 2
The total is 4.4, now it is > 4 and the service goes into WARNING status, the service has gone into a degraded status. It continues to work, and it may not require immediate technical action, but it is clear that there has been a problem with your infrastructure.
2 x 0 (routers in OK) + 2 x 0 (switches in OK) + 18 x 0 (apache OK) + 2 x 1.2 (apache CRIT) + 3 x 0 (weblogic OK) + 1 x 2 (weblogic CRIT) + 1 x 0 (mysql OK) Total: 4.4 --> The service will be in WARNING
Suppose that in addition to the above, a Router fails:
- 2 x Apache Server in CRITICAL x 1.2 points = 2.4
- 1 x Weblogic Server in CRITICAL x 2 = 2
- 1 x Router in CRITICAL x 5 = 5
Now 9.4 is above the threshold set at 6 for CRITICAL, so, the service goes into critical, the service is not working and immediate technical action is required.
1 x 0 (routers OK) + 1 x 5 (router CRIT) + 2 x 0 (switches OK) + 18 x 0 (apache OK) + 2 x 1.2 (apache CRIT) + 3 x 0 (weblogic OK) + 1 x 2 (weblogic CRIT) + 1 x 0 (mysql OK) Total: 9.4 --> The service is in CRITICAL
Pandora FMS will alert the corresponding work team (operators, technicians, etc.).
Service monitoring is a feature only available in Pandora FMS Enterprise version.
22.214.171.124 How simple mode works
The weight system might be too complex when monitoring needs are quite basic. That is why a new simple mode is available on the service configuration.
Within this mode, it is only required to point out which elements are critical and which ones are not.
Only the elements checked as critical will be taken into account to carry out the calculations and only the critical element status will have actual value.
- When a percentage between 0 and 50% of the critical elements is in critical status the service will go into warning status.
- When more than 50% of the critical elements go into critical, the service will go into critical status.
Follow this example of a simple service:
- Router as critical element.
- Printer as non critical element.
- Apache server as critical element.
At some point, the elements report this status:
- Router on critical.
- Printer on critical.
- Apache server on warning.
The service status is warning, because the printer is not a critical element and its status is not taken into account, as well as the Apache service status, which, even though it is a critical element, will only be taken into account in critical status. In this situation, one critical element is on critical status, 50% of the critical elements.
Other situation might be the elements reporting these status:
- Router on critical.
- Printer on critical.
- Apache server on critical.
The service status is normal, since over 50% of the critical elements are on critical status.
Finally, the elements might report these status:
- Router on normal.
- Printer on critical.
- Apache on normal.
The service status is normal, since less than 50% of the critical elements are on critical status. In fact, no key elements are in critical status, only the printer, which by not being a critical element, is not taken into account in calculations.
126.96.36.199 Root services
From Pandora FMS OUM726 version 7.0 onwards, services are evaluated slightly differently.
From now on, services that are not part of another service will be evaluated, which are known as root services. This logical change allows to speed monitoring, minimizing work queues.
In addition and based on that, when a service defined in a Pandora FMS node appears as a Metaconsole root service element, the Metaconsole server will be the one to evaluate it, updating the values stored in the node.
This provides a more efficient distributed logic, and allows to apply a cascade protection system based on services. This point is fully discussed in [Cascade service protection].
Metaconsole service possibilities have also been extended, allowing to add other services, modules or agents as service elements. In previous versions, only node services could be added.
1.2.2 Creating a New Service
The Enterprise version is required and the PredictionServer component must be enabled to be able to use these services.
The services may represent:
- Complete agents
- Other Services
Service values are calculated using the Prediction Server which uses the default interval of the prediction modules.
Once you have all the devices monitored. Add within each service all the modules, agents or sub-services whose service you need to monitor. For example, if you want to monitor the Online Store service, you need a module for content, a service that monitors the status of communications and so on. Throughout the following steps, it is described how to create a service with Pandora FMS.
To create a new service, click on Services at the Topology Maps .
A list of all the available services will be shown. The next screenshot shows an empty service list.
188.8.131.52 Initial Configuration
To create a new service, click on the 'Create' button and fill out the form as shown below.
The names of the form fields and their meaning are as follows:
- Name: The name of the service.
- Description: Service description, a long mandatory text. Said description will be the one to appear in the service map, the service table view and the service widget (instead of the name).
- Group: The group of the service. It is quite useful for organization purposes and to enforce SLA (Service Level Agreement) restrictions.
- Mode: Mode in which element weight calculation is performed.
- Manual: The weights should be entered manually into the service and their elements.
- Auto: Given that the 'critical' threshold for the service is '1' and the 'warning' threshold is '0.5'. It is also assumed that every time an element is created for this service, weights of '0' for the 'OK' status, '0.5' for 'warning' and '1' for 'critical' will be automatically assigned. When the total value of these elements reach 1, the service will be critical.
- Simple: There is no need to enter weights, only enable or disable a checkbox to indicate if the element is critical. In this mode, if the number of elements in critical status is between 0 and 50%, the service will be in warning mode. If the number of elements in critical is more than 50%, the service will be critical.
- Critical: The weight threshold to enter the 'critical' status. This field is disabled when auto mode is enabled and it has default value '1'. It is not visible when simple mode is selected.
- Warning: Weight threshold for declaring service in warning status. This field is disabled when the auto mode is selected and has default value '0.5'. Not visible when the simple mode is selected.
- Agent to store data: The service stores the data in special data modules (particularly prediction modules) and it is necessary to enter an agent to be the container of these modules, as well as the alarms that have to be configured in this form. Note: Please bear in mind that the interval where all service module calculations will be performed depends on the agent interval configured as a container.
- Quiet: It activates the service silent mode, it will not generate alerts or events.
- Cascade Protection: It enables cascade protection over service elements. These will not generate alerts or events if they belong to a service (or sub-service) in critical state.
- Favorite: Token to turn the new service into favorite. If it is activated, a direct link will be provided in the lateral menu.
- Calculate continuous SLA for this service: It activates the creation of SLA and SLA value modules for the current service. If disabled, dynamically calculated SLA information is not available, and SLA compliance alerts for this service do not work. It is used for cases where the number of services needed is so high that it may affect performance.If this option is disabled, once the service has been created, the data history of these modules will be deleted and information will be lost.
- SLA Interval: The time range for performing SLA calculation. The default value is '1 month'.
- SLA Limit: OK status threshold of the service considered a positive SLA for the time period you have set in the previous field.
- Warning Service Alert: Alert template that the service will use to issue the alert when the service goes into warning status.
- Critical Service alert: Alert template used by the service to issue the alert when the service goes into critical status.
- SLA Critical Service Alert: Alert template that the service will use to issue the alert if the SLA restrictions are not met.
184.108.40.206 Element Configuration
Once the form has been filled out correctly, there will be an empty service that must be filled in with elements or service items as seen below. In the service edit form, select the' Config Elements' tab.
You will see a page like the one below where you can manage (modify, add new ones or delete) service elements.
These are the fields featured in the service element creation and edition form:
- Type: A drop-down list that can show services, modules or agents.
- Agent: The agent smart-search input control. It is only visible if the element to create or edit is either the 'agent' or the 'module' type.
- Module: The drop-down list along with the agent's modules previously chosen via smart search. This control is only visible when editing or creating a service element for the module type.
- Service: The drop-down list of the services to create an item. It is only visible if the item is of the 'create' or 'edit service' type. It is also important to keep in mind that the services which will appear in the drop-down list are not ancestors of the service. It is also necessary to show an appropriate tree-structure dependency between the services.
- Critical: A checkbox to select if the element is critical. Not visible unless the service is in simple mode.
- Weight on Critical: The weight of the element if it is in 'critical' status. The default value is '1'. It is disabled if the service is in 'auto calculate' mode. Not visible if the service is in simple mode.
- Weight on Warning: The weight of the 'warning' status. The default value is '0.5'. It is disabled if the service is in 'auto calculate' mode. Not visible if the service is in simple mode.
- Weight on Unknown: The weight of the element if it is in unknown status. The default value is '0'. It is disabled if the service is in 'auto calculate' mode. Not visible if the service is in simple mode.
- Weight on OK: The weight of the element if it is in perfect conditions. The default value is '0'. It is disabled if the service is in 'auto calculate' mode. Not visible if the service is in simple mode.
The last column at the right, entitled "Actions", shows these icons:
- Edit: The icon represented by a wrench with an orange handle. Edit the element of the row corresponding to that icon.
- Delete: The icon represented by a red cross. When clicking on it, you will be asked for confirmation to remove and delete the service element from the database.
220.127.116.11 Modules created when configuring a service
- SLA Value Service: The percentage value of the SLA compliance. (async_data).
- Service_SLA_Service: This shows whether the SLA is being accomplished or not. (async_proc).
- Service_Service: This module shows the sum of the weights of the service. (async_data).
1.2.3 Service Visualization
18.104.22.168 Simple all-service view
It is the operation list that shows all created services. Of course, it only shows those groups that the user that is using the Pandora FMS console has access to.
To get to this view, go to the Operation menu, open the Monitoring entry and there is the Services section.
Each row represents a service, and the columns represent:
- Name: The name of the service.
- Description: The service's short description.
- Group: The icon of the group the service belongs to.
- Critical: The threshold value for weight sums to get the service into 'critical' status.
- Warning: The threshold value for weight sums to get the service into 'warning' status.
- Value: The current value for weight sums for the service.
- Status: An icon that represents the status of the service. Four possible status are represented:
- Red: The service is in 'critical' status because the value exceeded the critical threshold.
- Yellow: The service is in 'warning' status because the value equaled or exceeded the critical threshold.
- Green: The service is within the 'normal' range because weight sum does not reach the threshold.
- Gray: The service is in 'unknown' status. This usually means the service has been recently created and does not contain any modules or the Pandora FMS Prediction server is down.
- SLA: The current value of the SLA Service. The values can be:
- OK: The SLA is met for the interval defined in the SLA service.
- INCORRECT: The SLA is not met for the interval currently defined in the SLA Service.
- N/A: The SLA is in 'unknown' status because there is not enough data to perform the calculation.
22.214.171.124.1 Table including all services
A table for quick display including all visible services and their current status.
126.96.36.199.2 Simple list of a service and its elements
This view is accessible by clicking on the name of a service in the list of all services, or through the magnifying glass icon tab in the service title header.
Pandora FMS will show a page similar to the one shown in the following screenshot:
In the screenshot, two sections can be distinguished, the service with the same columns as in the previous view at the top. And the list of the elements that make up this service at the bottom.
The list of elements appears in table format, where the rows correspond to each element and the columns represent:
- Type: The icon which represents the element type. It is a building block for modules or some stacked blocks for an agent and a Network Diagram Icon for the services.
- Name: The text which contains the name of the module, agent or service. They are also linked to the corresponding section.
- Description: Short description.
- Weight critical: The value if the element is in 'critical' status.
- Weight warning: The value if the element is in 'warning' status.
- Weight normal: The value if the element is in 'normal' status.
- Data: The value of the element. It can adopt the following modes:
- Module: The value of the module.
- Agents: The text that displays the agent's status.
- Service: The weight sum of the elements of the service that has been chosen as the element for the parent service.
- Status: The icon which represents the element's status by color.
Keep in mind that service-element calculation is performed by Prediction Server. What you look at is not real-time data. There are some situations in which a module's agent is added to the service where its weight will not be updated until calculation is performed by the Prediction Server again.
188.8.131.52.3 Service map view
This view will display the service in arborescent form as you can see in the following screenshot. That way, it is possible to quickly see how modules, agents or sub-services influence service monitoring. Even in sub-services you can see what influences them when calculating the status by summing weights.
The possible nodes can be:
- Module Node: It is represented by the 'heartbeat' icon. This node is always final (leaf).
- Agent Node: It is represented by the 'CPU box' icon. This module is always final too (leaf).
- Service Node: It is represented by the 'crossed hammer and wrench' icon. This module is not a final node. It is required to contain additional nodes.
The node's colors and the arrow which connects them to the service depend on the node's status, as always green OK, red critical, yellow warning or grey in unknown state.
There are the following attributes within the node:
- Title: The name of the service's / agent's or module's node, accompanied by the agent.
- Value list:
- Critical:: The total weight it reaches in 'critical' status, except if it is the root-service node, which represents a threshold to reach the 'critical' status.
- Warning: The weight if it reaches 'warning' status, except if it is the root-service node, which represents the threshold to reach the 'warning' status.
- Normal: The weight if it reaches 'normal' status, except if it is the root-service node, in which case nothing will be displayed here.
- Unknown: The 'unknown' status, except if it is the root-service node, which represents a threshold to reach the 'unknown' status.
You may click on each node in the tree. The target link represents the operational view of the node itself.
When the service mode is simple, a red exclamation mark appears on the right side of the critical elements.
184.108.40.206.4 Services within the Visual Console
From Pandora FMS versions 5 onwards, you may add services in the Visual Console like any other item on the map.
To create a service item on a map, the process is the same as for all other visual map items, but the options palette will be the same as in the screenshot.
It contains the following attributes:
- Label: The title shown within the visual console's node.
- Service: Drop-down list that shows the services it has access to, to add to the map.
Note that a service item, unlike other items in the visual map, cannot be linked to other visual maps, and always the clickable link in the visual console is intended for the tree service map view described above.
220.127.116.11 Service tree view
This view allows you to view services in the form of a tree.
Each level shows the total number of elements included in each service or agent.
- Services: It reports the total number of services, agents and modules that belong to that service.
- Agents: It reports the number of modules in critical state (red color), warning (yellow color), unknown (gray color), uninitiated (blue color) and normal state (green color).
Services that do not belong to another one will always be shown on the first level. In the case of a child service, it will be shown nested inside its parent.
1.2.4 How to read service values
Planned shutdowns added before the stop date allow recalculating the value of SLA reports, given that it allows "backwards" recalculating with scheduled shutdowns added afterwards (that option is globally activated in the general setup). When it is an SLA service report, if there is a scheduled shutdown that affects one or several service elements, the scheduled shutdown is considered to affect the service as a whole, since the shutdown impact on the whole service cannot be measured.
It is worth highlighting that this is at a report level. Therefore, service trees, and the information presented in the visual console are not altered based on planned shutdowns added after the intended execution date. These service compliance percentages are calculated in real time, based on the history data of the same service, they do not have anything to do with the actual report.
On the other hand, it is important to know how the compliance percentage of a service is calculated:
Suppose there is a service defined by a 95% compliance in a 1-hour interval. A table of values, where t is time, x is the compliance % (SLAs), and s is whether complies or not (1 it complies, 0 it fails), will be used. In 1 hour there should be exactly 12 samples (assuming the interval is 5 minutes long).
In a similar case, where the service complies for the first 11 samples (first 55 minutes) and it fails in the 60th minute these would be the values:
t | s | x --------+-------+-------- 1 1 100 2 1 100 3 1 100 4 1 100 5 1 100 6 1 100 7 1 100 8 1 100 9 1 100 10 1 100 11 1 100 12 0 91,6
This case is easier to calculate. The % is calculated depending on the number of samples, for example in t3, there are a total of three samples that meet service, a 100%, whereas in t12, there are 12 samples and 11 are valid samples: 11 / 12.
Suppose you are in the middle of the series, and it is recovering slowly:
t | s | x --------+-------+-------- 1 1 100 2 1 100 3 1 100 4 1 100 5 1 100 6 0 83,3 7 1 85,7 8 1 87,5 9 1 88,8 10 1 90 11 1 90,9 12 1 91,6
So far all seems similar to the previous scenario, but see what happens if you go over time:
t | s | x --------+-------+-------- 13 1 91,6 14 1 91,6 15 1 91,6 16 1 91,6 17 1 91,6 18 1 100 19 1 100 ....
Now there is unintuitive behavior, because the volume of valid samples remains 11 for a time window that goes up to t18, where the only invalid value is out of the window, so in t18 compliance becomes 100%. This step between 91.6 and 100 is explained by the size of the window. The larger the window is (usually SLA calculation interval is daily, weekly or monthly), the less abrupt the step will be.
Weight calculation on simple mode
Weights are dealt with slightly differently on simple mode, since there is only the critical weight and the possibility of going into two more status apart from the normal one. Each element receives weight 1 on critical and 0 on other status, and each time there is a change in service elements, service weights are calculated again. The warning weight can be overlooked. It always has value 0.5 because if it is 0, the service will always be on warning at least, but warning weight is not used in simple mode. The critical weight is calculated so that it is half of the element critical weights summed, which is 1. If there are 3 elements, the service critical weight is 1.5 and then, it is the server the one in charge or checking whether the critical weight has been exceeded or matched to render the service into critical or warning status.
1.2.5 Service cascade protection
From OUM725 update on, there is the possibility of muting service elements in a dynamic way.
This allows to avoid an alert overload for each element that belongs to a certain service or sub-services.
When the 'service cascade protection' feature is active, the action linked to the template configured for the root service will be executed. It will report which the elements have an incorrect status within the service.
It is important to take into account that this system allows the alerts of the elements within the service to be triggered when they go to critical status, even if the general service status is correct.
Service cascade protection will indicate us which elements have failed regardless of the depth of the defined service.
In the example above we see that we have one of the elements of our service in critical status. Even if the main service is correct, it will warn us of the critical state of the elements within, triggering the alert related with the element in critical status.
1.2.6 Root cause analysis
You may have an endless number of sub-services (paths) within a service. In previous versions, Pandora FMS alerted indicating the service status (normal, critical, warning, etc.). From OUM725 on, there is a new macro available that will show the service status root cause.
To use it, add the following text to the template linked to the service:
Alert body: Example message The series of events that have caused the service status is the following one: _rca_
This will return an output similar to this one:
Alert body: Example message The series of events that have caused the service status is the following one: [Web Application -> HW -> Apache server 3] [Web Application -> HW -> Apache server 4] [Web Application -> HW -> Apache server 10] [Web Application -> DB Instances -> MySQL_base_1] [Web Application -> DB Instances -> MySQL_base_5] [Web Application -> Balanceadores -> 192.168.10.139]
By seeing this output, it is supposed that:
- Apache servers 3,4 and 10 are in critical status
- MySQL_base databases 1 and 5 are down
- The 192.168.10.139 balancer does not respond
This added information allows to find out the reason behind the service status, reducing failure cause research tasks.
1.2.7 Service grouping
Services are logical groupings that make up an organization's business structure. That is why service grouping may make sense, since they depend on each other in many cases, creating for example a whole service (the business company) or more specific services (corporate web, communications, etc.). To group services, both the general and more particular services must be created, and the last ones must be added to the first one to create the logical tree-shaped structure.
This groups may help you to: create visual maps, configure alerts, apply monitoring policies, etc. Therefore, it is possible to create alerts that warn you when the business goes into critical status because sales representatives cannot do their job, or any branch is not working full capacity due to technichal problems with the ERP service.
To understand more clearly what service grouping is, take a look at these examples.
1.2.8 Service monitoring examples
18.104.22.168 Pandora FMS service
This is an example where the Pandora FMS monitoring service status, made up by the Apache, MysSQL services and Pandora FMS server and Tentacle, is monitored. At the same time, each and everyone of these elements is a service containing different components creating, by service grouping, a tree-shaped structure.
In this case, the general Pandora FMS service will go into critical status when reaching weight 2 and when warning reaches weight 1. As seen, the four components have different weights on Pandora FMS service:
- MySQL: It is essential for Pandora FMS service. Individual weight of 2 if MySQL is down. It will get a weight of 1 if it is in warning status, showing a warning in Pandora FMS service.
- Pandora Server: It is essential for Pandora FMS service. Individual weight of 2 if the Pandora FMS Server is down. Individual weight of 1 if it is in warning status, for example, due to CPU overload, scaling the warning until reaching Pandora FMS general service.
- Apache: It implies a degrading of Pandora FMS service, but not a total interruption, so it gets an individual weight of 1 if it is down, showing the warning status in Pandora FMS service.
- Tentacle: It entails a degrading, and certain components may fail, but it does not Mean Pandora FMS stops working completely, so its individual weight in case of failure is 1, showing a warning in the general service.
The following image depicts weight configuration of the elements of Pandora FMS service general status:
22.214.171.124 Cluster storing service, service grouping
Services are logical groups that make up part of the business structure of an organization. Therefore, service grouping is reasonable since sometimes some services on their own do not have a complete meaning. To group services, they just need to be added to a greater service as elements, creating a new logical group.
In the following example, there is an HA storing cluster. This time, a system of two fileservers working at the same time has been chosen, each one controlling the percentage and the status of a series of hard drives that provide service to particular departments, creating a group service tree-shaped structure.
According to this structure, the critical threshold of the company's storing service is reached when both fileservers fail, since that would turn down the service, while just one of them failing would entail a service downgrading. The following image contains weight configuration granted to two storing service main elements:
This image shows the content and weight configuration of the FS01 grouped service. Here the elements have a specific weight according to their severity:
- FS01 ALIVE: Critical for the FS01 service, since it is the virtual IP allocated to the first hard drive cluster. Individual weight of 2, since if it is down, the rest of the service elements will not work. There is no warning threshold, since it is data that depends on the status Yes/No.
- DHCPserver ping: critical for the FS01 service. It has an individual weight of 2. In this case, there is no warning threshold either.
- Hard drives: They have an individual weight of 1 in case they reach their critical threshold, and 0.5 for their warning threshold, so this will only affect critically the FS01 service if there are at least two in critical status or the four hard drives in warning status.
1.3 Pandora Server
It is mandatory that the Prediction Service runs properly and also to have the Enterprise Version of Pandora FMS installed.