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Ongoing platform maintenance

Daily maintenance checklist

The tasks on this checklist should be performed each day by the platform operator who is currently on the maintenance rotation.

Review and respond to alerts

Review all alerts on Prometheus (requires the VPN).

Investigate open alerts

  • Use our guides for reviewing alerts (prometheus for alert descriptions, links to the relevant rules, and starting points for reviewing each type of alert.
  • Was the alert caused by known maintenance or testing in dev environments? Check with other members of the team if you can’t determine the source.
  • Is this a recurring alert? Search alert history to determine how frequently it is occuring and what event may have started its firing.
  • Should the underlying condition have caused an alert? Alerts should only be raised when they’re something we need to remediate.

Is the alert a real issue?

If the alert may indicate a security issue follow the Security Incident Response Guide , otherwise work to remediate its cause.

Is the alert a false-positive?

If the alert can be tuned to reduce the number of false-positives with less than two hours of work, do it. If more work is required to tune the alert, add a card to capture the work that needs to be done or +1 an existing card if one already exists for tuning the alert.

Be prepared to represent support needs at the next grooming meeting to ensure that cards to fix alerts are prioritized properly.

Provide support backup

As necessary and requested, provide assistance to the platform operator on a support rotation concurrent to your maintenance rotation.

Review expiring certificates

You can view a consolidated list of all expiring certificates on the Doomsday Dashboard (requires the VPN). Make note of any that are expiring within two weeks, make sure the team is aware, and plan with the team to determine who will renew the expiring certificate(s) and when.

You can also view this information in each of our four environments, tooling, development, staging, and production, by running doomsday dashboard on the command line.

Ensure all VMs are running the current stemcell

  • Lookup the most recent published stemcell version at:

  • From the jumpbox in each of our four environments, tooling, development, staging and production, run bosh deployments and verify the stemcell in use for each deployment is current. For example, the 621.61 stemcell is outdated below:

    root@Tooling:/tmp/build/8e72821d$ bosh deployments | grep go_agent
    concourse-production    awslogs-xenial/14       bosh-aws-xen-hvm-ubuntu-xenial-go_agent/621.64  -
    concourse-staging       awslogs-xenial/14       bosh-aws-xen-hvm-ubuntu-xenial-go_agent/621.64  -
    developmentbosh         awslogs-xenial/14       bosh-aws-xen-hvm-ubuntu-xenial-go_agent/621.64  -
    doomsday                awslogs-xenial/14       bosh-aws-xen-hvm-ubuntu-xenial-go_agent/621.64  -
    nessus-manager-prod     awslogs-xenial/14       bosh-aws-xen-hvm-ubuntu-xenial-go_agent/621.64  -
    opsuaa                  awslogs-xenial/14       bosh-aws-xen-hvm-ubuntu-xenial-go_agent/621.64  -
    postfix-production      awslogs-xenial/14       bosh-aws-xen-hvm-ubuntu-xenial-go_agent/621.61  -
                            bosh-dns/1.20.0         bosh-aws-xen-hvm-ubuntu-xenial-go_agent/621.64
    productionbosh          awslogs-xenial/14       bosh-aws-xen-hvm-ubuntu-xenial-go_agent/621.64  -
    prometheus-production   awslogs-xenial/14       bosh-aws-xen-hvm-ubuntu-xenial-go_agent/621.64  -
    prometheus-staging      awslogs-xenial/14       bosh-aws-xen-hvm-ubuntu-xenial-go_agent/621.64  -
    stagingbosh             awslogs-xenial/14       bosh-aws-xen-hvm-ubuntu-xenial-go_agent/621.64  -
  • When the stemcells are out-of-date:

    • Trigger the appropriate deploy-... jobs in Concourse
      • Triggering more than X jobs simultaneously is not advised in case any issues arise during the deployment or if you’re interrupted. X being a number you’re comfortable with monitoring which can vary based on experience or confidence in the deployment. If you’re not sure, ‘3’ is a good starting point.

Monitor automated platform builds

The platform’s CI builds can be automatically triggered by third-party resources when updates are released (ie. source code, stemcell). Monitor the #cg-platform and #cg-platform-news Slack channels for notifications about any failed builds. For any automated builds that failed, review the logs of the failed build task in Concourse, and escalate the failure to platform ops if a cursory triage and rebuild does not fix this issue.

Review AWS CloudTrail events

Easy way

Run for each AWS account we own, and review the output

Hard way

Get familiar with the documentation for CloudTrail logs.

Use the AWS Console to review API activity history for the EventNames listed below. Or, use the AWS CLI with the appropriate $event_name, and parse the emitted JSON:

aws cloudtrail lookup-events --lookup-attributes AttributeKey=EventName,AttributeValue=$event_name

These EventNames should be attributed to human individuals on the team:

  • ConsoleLogin

All human-generated events should be mapped to named users, e.g. firstname.lastname, and NOT to Administrator. Discuss the event(s) with the indicated operator(s)

All events in the following EventNames should be attributed to Terraform:

  • DeleteTrail
  • UpdateTrail
  • ModifyVpcAttribute
  • PutUserPolicy
  • PutRolePolicy
  • RevokeSecurityGroupEgress
  • RevokeSecurityGroupIngress
  • AuthorizeSecurityGroupEgress
  • AuthorizeSecurityGroupIngress
  • CreatePolicy
  • CreateSecurityGroup

Terraform runs on instances that use instance profile roles, so authorized events will include:

  • a user name like i-17deadbeef1234567
  • a source IP address within AWS.
  • an AWS access key starting with ASIA

If you observe any non-Terraform activity, discuss the event(s) with the indicated operator(s) (see above)

If you’re unable to ascertain an event was authorized, follow the Security Incident Response Guide.

Review vulnerability and compliance reports

If the reports contain any HIGH items work to remediate them.

Is an update from our IaaS provider required to remediate?

Open a case with the IaaS provider and monitor the case until it has been resolved.

Is a stemcell update required to remediate?

Ask for a date when new stemcells will be delivered in #security in the CF Slack.

Is a bosh release update required to remediate?

Update the bosh release and file a PR for the changes. Once the PR is merged, ensure the updated release is deployed to all required VMs.

PR as you go

If you see a way to make this checklist better, just submit a PR to the cg-site repo for content/docs/ops/

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