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Conductor Documentation

Studio Conductor Backup and Restore Guide

Overview

Snapshots provide a way for backing up the state of the Conductor Manager. A snapshot should be taken on a daily basis (suggest in an off peak time) and can be automated using the REST API as an alternative to an operator manually running the snapshot as shown here in this user guide.

Backing up the virtual machine that the Conductor Managers run on should be done at regular intervals, this would be dictated by a backup policies and would likely involve daily, weekly, monthly and yearly backups as required. The method for backing up the Conductor Manager virtual machines falls outside the scope of this document.

Snapshots

Snapshots of the HA Conductor Manager cluster should be taken at regular intervals (suggest daily), this can be automated through the REST based Service API or can be done manually by an operator using the UI or CFY CLI. The screenshot below shows the menu presented to the operator when the settings button (i.e. cog icon on the right top of the menu) is clicked.

Creating snapshot

  1. Create snapshot:

    CLI

    cfy snapshots create SNAPSHOT_ID

    REST

    curl -X PUT --header "Tenant: <manager-tenant>" -u <manager-username>:<manager-password> "http://<manager-ip>/api/v3.1/snapshots/<snapshot-id>"

    Parameters specification available in the Studio Conductor API documentation.

  2. Download snapshot:

    CLI

    cfy snapshots download [OPTIONS] SNAPSHOT_ID

    REST

    curl -X GET --header "Tenant: <manager-tenant>" -u <manager-username>:<manager-password> "http://<manager-ip>/api/v3.1/snapshots/<snapshot-id>/archive" > <snapshot-archive-filename>.zip

    Parameters specification available in the Studio Conductor API documentation.

Applying snapshot

  1. Upload snapshot

    CLI

    cfy snapshots upload [OPTIONS] SNAPSHOT_PATH

    REST

    curl -X PUT \
--header "Tenant: <manager-tenant>" \
-u <manager-username>:<manager-password> \
"http://<manager-ip>/api/v3.1/snapshots/archive?snapshot_archive_url=http://url/to/archive.zip"

    Parameters specification available in the Studio Conductor API documentation.

  2. Switch the Conductor Manager to maintenance mode

    CLI

    cfy maintenance-mode activate

    Verify that the system has entered maintenance mode before moving on to the next step.

  3. Restore snapshot

    CLI

    cfy snapshots restore [OPTIONS] —tenant-name <TEXT> SNAPSHOT_ID

    REST

    curl -s -X POST \
--header "Content-Type: application/json" \
--header "Tenant: <manager-tenant>" \
-u <manager-username>:<manager-password> \
-d '{"tenant_name": "<manager-tenant>", "force": false, "restore_certificates": false, "no_reboot": false}' \
"http://<manager-ip>/api/v3.1/snapshots/<snapshot-id>/restore"

    Parameters specification available in the Studio Conductor API documentation.

  4. Snapshot-restore status

    (Supported for Conductor Manager 5.0.5 and above.)

    Check the status of the restore_snapshot workflow by using the cfy snapshots status command.

    CLI

    cfy snapshots status

    REST

    curl -X GET "http://<manager-ip>/api/v3.1/snapshot-status"

    There are two possible responses:

    1. {‘status’: ‘Snapshot restore in progress…\nThis may take a while, depending on the snapshot size.‘}
    2. {‘status’: ‘No restore_snapshot workflow currently running.‘}

If the restore is done as part of Upgrade to a newer Conductor Manager version, consider performing also:

  1. Execute install_new_agents workflow on the new Conductor Manager so that all hosts agents are updated and connected to RabbitMQ on the new Conductor Manager.

  2. Update plugins

This is done in order to update the deployments to use new plugins(when upgrading to py2py3 plugins wagons).

First, upload new plugins, then execute:

CLI

   cfy plugins update [OPTIONS] BLUEPRINT_ID

REST

```
curl -X PUT \
-H "Content-Type: application/json" \
-H "Tenant: <manager-tenant>" \
-u <manager-username>:<manager-password> \
-d '{"force": "<force>"}' \
"<manager-ip>/api/v3.1/plugins-updates/<blueprint-id>/update/initiate"
```

Parameters specification available in the Studio Conductor API documentation.

Special case – restoring scheduled executions

During a snapshot-restore procedure pending scheduled execution tasks are added to the message queue, overdue executions on the other hand are marked as failed. For example assume following flow:

During snapshot-restore procedure the first workflow (scheduled for 4:00) is marked as failed as it is overdue at this moment. Failure to reschedule overdue workflow is also logged (at INFO log level):

Execution 7dbc1ae2-5a00-497e-9ebb-13942856834a scheduled for 2020-03-13T04:00:00.000Z is overdue. Marking as FAILED.

The other workflow (scheduled for 8:00) is restored correctly (status scheduled) and added to the message queue. At 8:00 the other workflow is executed.

Failure Recovery

Whole cluster down or working wrong

  1. Save /etc/cloudify/ssl/* files.
  2. Teardown managers.
  3. Install fresh managers with existing certificates in /etc/cloudify/config.yaml.
  4. Create and join cluster.
  5. Apply latest working version snapshot on active manager.

One manager cluster node down

  1. Remove manager from the cluster.
  2. Destroy manager.
  3. Bootstrap fresh manager.
  4. Join existing cluster.

Effect: Healthy manager cluster

Active manager node down

  1. Other healthy manager from the cluster automatically becomes active manager.
  2. Investigate error:
  3. Either:
    • Fix problem
    • Destroy manager.
      1. Install manager.
      2. Join cluster.

Effect: Healthy manager cluster

Split brain

Description: Situation happens when for a while there is no connectivity between managers. Then each of them thinks that other managers are unhealthy and become master. After connectivity is back master becomes only one in cluster. It’s chosen based on the newest version of PostgreSQL database. All data from other managers will be synced with the active one and others will become standbys. All data/installed deployments/plugins will get lost.