ARGOMS Availability and Continuity Plan

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Introduction

This page reports on the Availability and Continuity Plan for ARGO Messaging Service and it is the result of the risk assessment conducted for this service: a series of risks and threats has been identified and analysed, along with the correspondent countermeasures currently in place. Whenever a countermeasure is not considered satisfactory for either avoiding or reducing the likelihood of the occurrence of a risk, or its impact, it is agreed with the service provider a new treatment for improving the availability and continuity of the service. The process is concluded with an availability and continuity test.

Last Next
Risk assessment 2019-02-25 -
Av/Co plan and test 2019-02-26 -

Previous plans are collected here: https://documents.egi.eu/document/3650

Performances

In the OLA it was agreed the following performances targets, on a monthly basis:

  • Availability: 98%
  • Reliability 98%
Other ava requirements:
* The service is accessible through AMS Tokens 
* The service is accessible Argo-AuthN which is an Authentication Service. It creates a mapping mechanism from an alternative authentication mechanism to AMS tokens (ex X509 to AMS Tokens) 
* The service is accessible via API and the  argo-ams-library.  

The service availability and reliability is Part of OPS-MONITOR-Critical profile is regularly tested by Argo   
[https://argo.egi.eu/egi/dashboard/OPS-MONITOR-Critical/GRIDOPS-MSG  GRIDOPS-MSG A&R]

The performances reports in terms of Availability and Reliability are produced by ARGO on an almost real time basis and they are also periodically collected into the Documentation Database.

Risks assessment and management

For more details, please look at the google spreadsheet. We will report here a summary of the assessment.

Risks analysis

 TO REVIEW 
Risk id Risk description Affected components Established measures Risk level Treatment Expected duration of downtime / time for recovery
1 Service unavailable / loss of data due to hardware failure Argo Messaging Service Automated Deployment and Backup Procedures that allow for rapid redeployment of affected components Low Redirect DNS to poin to one the 3 instances runinng behind the HA/LB Service while we reinstall/migrate the Service in a new VM and update DNS up to 8 hours
2 Service unavailable / loss of data due to software failure Argo Messaging Service Automated Deployment and Backup Procedures that allow for rapid redeployment of affected components Low Redirect DNS to poin to one the 3 instances runinng behind the HA/LB Service while we reinstall/migrate the Service in a new VM and update DNS up to 8 hours
3 service unavailable / loss of data due to human error Argo Messaging Service Automated Deployment and Backup Procedures that allow for rapid redeployment of affected components Low Redirect DNS to poin to one the 3 instances runinng behind the HA/LB Service while we reinstall/migrate the Service in a new VM and update DNS Up to 8 hours
4 service unavailable for network failure (Network outage with causes external of the site) Argo Messaging Service Automated Deployment and Backup Procedures that allow for rapid redeployment of affected components Low Redirect DNS to poin to one the 3 instances runinng behind the HA/LB Service while we reinstall/migrate the Service in a new VM and update DNS up to 8 hours
5 Unavailability of key technical and support staff (holidays period, sickness, ...) Argo Messaging Service There is always one member of the team on call. Low Redirect DNS to poin to one the 3 instances runinng behind the HA/LB Service while we reinstall/migrate the Service in a new VM and update DNS up to 8 hours
6 Major disruption in the data centre. Fire, flood or electric failure for example Argo Messaging Service Automated Deployment and Backup Procedures that allow for rapid redeployment of affected components Medium Redirect DNS to poin to one the 3 instances runinng behind the HA/LB Service while we reinstall/migrate the Service in a new VM and update DNS 1 or more working days
7 Major security incident. The system is compromised by external attackers and needs to be reinstalled and restored. Argo Messaging Service Automated Deployment and Backup Procedures that allow for rapid redeployment of affected components Low Redirect DNS to poin to one the 3 instances runinng behind the HA/LB Service while we reinstall/migrate the Service in a new VM and update DNS 1 or more working days
8 (D)DOS attack. The service is unavailable because of a coordinated DDOS. Argo Messaging Service Automated Deployment and Backup Procedures that allow for rapid redeployment of affected components Low Redirect DNS to poin to one the 3 instances runinng behind the HA/LB Service while we reinstall/migrate the Service in a new VM and update DNS up to 8 hours

Outcome

 TO REVIEW 

The level of all the identified risks is acceptable and the countermeasures already adopted are considered satisfactory

Additional information

procedures for the several countermeasures to invoke in case of risk occurrence (put a link if public)

Specify if the Availability targets are different in case the plan is invoked.

Recovery requirements:
*Maximum tolerable period of disruption (MTPoD) (the maximum amount of time that a service can be unavailable or undelivered after an event that causes disruption to operations, before its stakeholders perceive unacceptable consequences): 2 days
*Recovery time objective (RTO) (the acceptable amount of time to restore the service in order to avoid unacceptable consequences associated with a break in continuity (this has to be less than MTPoD)): 2 days
*Recovery point objective (RPO) (the acceptable latency of data that will not be recovered): n.a.

Specify if there is a particular approach for the return to normal working conditions if different from what already reported in the risk assessment.

The support unit '''Messaging''' shall be used to report any incident or service request

The providers can contact EGI Operations via ticket or email in case the continuity plan is invoked, or to discuss any change to it.

Availability and Continuity test

The proposed A/C test will focus on a recovery scenario: the service has been disrupted and needs to be reinstalled from scratch. The time spent for restoring the service will be measured, using the last backup of the data stored in it and evaluating any eventual loss of information Performing this test will be useful to spot any issue in the recovery procedures of the service.

  • Start of recovery scenario test:
Tue Feb 19 09:09:02 CET 2019 One of the 3 VMs running the AMS service instance has been disrupted and needs to be reinstalled from scratch.
  • End of test recovery scenario:
Tue Feb 19 10:10:01 CET 2019: We assumed a scenario where the second AMS node faced a hardware failure and a new VM had to be spawned in order to restore it
and able to provide the AMS in full high availability/load balancing mode. The process of spawning the new VM started at 09:25 CET (we allocated approximately
15 minutes for simulating the analysis since the detection of the VM failure at 09:09 CET).

It should be noted that during the ~1 hours that the ams node was down the existing user sessions were not affected and new user sessions could be established without any noticeable delay. The test showed that in case of failure of one of the ams node, there is no impact on the users.

Here more details about the test.

Revision History

Version Authors Date Comments

Alessandro Paolini 2019-02-25 first draft

Alessandro Paolini 2019-02-26 added the information about the AC test; plan finalised

Alessandro Paolini 2020-08-24 starting the review...