Migrating from arvados-node-manager to arvados-dispatch-cloud » History » Version 14

Tom Clegg, 03/07/2019 06:45 AM

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h1. Migrating from arvados-node-manager to arvados-dispatch-cloud
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{{toc}}
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h2. Choose a node
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The dispatch service can run on any host that can connect to the Arvados API service, the cloud provider's API, and the SSH service on cloud VMs. In the following example it runs on the same node as the API server and controller.
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h2. Prepare key pair and worker VM image
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Generate an SSH private key with no passphrase. Save it in the cluster configuration file (see @PrivateKey@ in the example below).
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If you are using Azure, the dispatcher will create a login account and install your public key automatically, so you do *not* need to save the corresponding public key in an authorized_keys file in the VM image (or anywhere else, for that matter).
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Prepare a worker VM image. It needs docker, arv-mount (python-arvados-fuse), and crunch-run ≥ 1.3.1.20190221194156.
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h2. Update cluster configuration file
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In @/etc/arvados/config.yml@, add configuration items for the dispatch service.
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<pre><code class="yaml">
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Clusters:
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  zzzzz:
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    CloudVMs:
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      BootProbeCommand: "mount | grep /mnt/scratch"
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      SSHPort: "2222"
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      SyncInterval: 1m
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      TimeoutIdle: 2m
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      TimeoutBooting: 10m
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      TimeoutProbe: 5m
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      TimeoutShutdown: 30s
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      ImageID: "https://zzzzzzzz.blob.core.windows.net/system/Microsoft.Compute/Images/images/zzzzz-compute-osDisk.55555555-5555-5555-5555-555555555555.vhd"
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      Driver: azure
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      DriverParameters:
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        SubscriptionID: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
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        ClientID: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
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        ClientSecret: 2WyXt0XFbEtutnf2hp528t6Wk9S5bOHWkRaaWwavKQo=
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        TenantID: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
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        CloudEnvironment: AzurePublicCloud
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        ResourceGroup: zzzzz
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        Location: centralus
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        Network: zzzzz
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        Subnet: zzzzz-subnet-private
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        StorageAccount: example
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        BlobContainer: vhds
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        DeleteDanglingResourcesAfter: 20s
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        AdminUsername: arvados
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    Dispatch:
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      PrivateKey: |
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        -----BEGIN RSA PRIVATE KEY-----
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        MIIEowIBAAKCAQEAqYm4XsQHm8sBSZFwUX5VeW1OkGsfoNzcGPG2nzzYRhNhClYZ
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        0ABHhUk82HkaC/8l6d/jpYTf42HrK42nNQ0r0Yzs7qw8yZMQioK4Yk+kFyVLF78E
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        GRG4pGAWXFs6pUchs/lm8fo9zcda4R3XeqgI+NO+nEERXmdRJa1FhI+Za3/S/+CV
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        mg+6O00wZz2+vKmDPptGN4MCKmQOCKsMJts7wSZGyVcTtdNv7jjfr6yPAIOIL8X7
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        ...
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        JIBvlVfcHb1IHMA9YG7ZQjrMRmx2Xj3ce4RVPgUGHh8ra7gvLjd72/Tpf0doNClN
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        ti/hAoGBAMW5D3LhU05LXWmOqpeT4VDgqk4MrTBcstVe7KdVjwzHrVHCAmI927vI
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        pjpphWzpC9m3x4OsTNf8m+g6H7f3IiQS0aiFNtduXYlcuT5FHS2fSATTzg5PBon9
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        1E6BudOve+WyFyBs7hFWAqWFBdWujAl4Qk5Ek09U2ilFEPE7RTgJ
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        -----END RSA PRIVATE KEY-----
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      StaleLockTimeout: 1m
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      PollInterval: 10s
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      ProbeInterval: 10s
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      MaxProbesPerSecond: 10
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    InstanceTypes:
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      x1lg:
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        ProviderType: x1.large
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        VCPUs: 16
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        RAM: 128G
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        Scratch: 128G
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        Price: 1.23
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    ManagementToken: "example-secret-management-token"
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    NodeProfiles:
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      dispatcher:                       # references ARVADOS_NODE_PROFILE in environment file (see below).
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        arvados-dispatch-cloud:
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          Listen: ":9006"
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</code></pre>
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Create the host configuration file @/etc/arvados/environment@.
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<pre>
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ARVADOS_NODE_PROFILE=dispatcher
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</pre>
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h2. Stop crunch-dispatch-slurm
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Stop and disable the crunch-dispatch-slurm service, and uninstall the package to make sure it doesn't start after the next reboot/upgrade.
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<pre>
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# systemctl stop crunch-dispatch-slurm
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# systemctl disable crunch-dispatch-slurm
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# apt-get remove crunch-dispatch-slurm
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</pre>
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Containers that have already been locked and submitted to SLURM will make their way through the SLURM queue, but newly queued containers will be left for arvados-dispatch-cloud to run.
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h2. Install arvados-dispatch-cloud
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<pre>
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# apt-get install arvados-dispatch-cloud
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</pre>
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For now, @ARVADOS_API_HOST@ and @ARVADOS_API_TOKEN@ environment variables must be provided (future versions will get these values from the config file). You can use @systemctl edit@ to do this through systemd:
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<pre>
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[Service]
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Environment=ARVADOS_API_HOST=zzzzz.arvadosapi.com
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Environment=ARVADOS_API_TOKEN=zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
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</pre>
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h2. Verify the service is running
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<pre>
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$ token="example-secret-management-token"
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$ curl -H "Authorization: Bearer $token" http://localhost:9005/metrics
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</pre>
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h2. Verify the service is functional
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Watch the dispatcher's logs while you run an Arvados container:
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<pre>
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# journalctl -ocat -fu arvados-dispatch-cloud
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</pre>
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Example logs:
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<pre>
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Starting Arvados dispatch cloud...
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{"Listen":"[::]:9006","PID":46639,"Service":"arvados-dispatch-cloud","level":"info","msg":"listening","time":"2019-02-18T18:10:33.550358536Z"}
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Started Arvados dispatch cloud.
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{"PID":46639,"level":"info","msg":"FixStaleLocks starting.","time":"2019-02-18T18:10:33.706568502Z"}
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{"PID":46639,"level":"info","msg":"FixStaleLocks finished (34.717µs), starting scheduling.","time":"2019-02-18T18:10:33.706606521Z"}
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{"N":0,"PID":46639,"level":"info","msg":"loaded initial instance list","time":"2019-02-18T18:10:33.982989844Z"}
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{"ContainerUUID":"c97qk-dz642-qxo0qjp93y2k4ht","InstanceType":"Standard_D1_v2","PID":46639,"Priority":1124349393114703,"State":"Queued","level":"info","msg":"added container to queue","time":"2019-02-18T18:15:33.620474859Z"}
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{"ContainerUUID":"c97qk-dz642-qxo0qjp93y2k4ht","InstanceType":"Standard_D1_v2","PID":46639,"level":"info","msg":"creating new instance","time":"2019-02-18T18:15:33.711915757Z"}
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{"Address":"10.25.64.8","IdleBehavior":"run","Instance":"/subscriptions/zzzzzzzz-zzzz-zzzz-zzzz-zzzzzzzzzzzz/resourceGroups/c97qk/providers/Microsoft.Compute/virtualMachines/compute-5656b5905b6e0c2d20ae4145148c6b31-7qs8dk3yfw0hteq","InstanceType":"Standard_D1_v2","PID":46639,"State":"unknown","level":"info","msg":"instance appeared in cloud","time":"2019-02-18T18:16:34.512277597Z"}
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{"Address":"10.25.64.8","Command":"sudo crunch-run --list","Instance":"/subscriptions/zzzzzzzz-zzzz-zzzz-zzzz-zzzzzzzzzzzz/resourceGroups/c97qk/providers/Microsoft.Compute/virtualMachines/compute-5656b5905b6e0c2d20ae4145148c6b31-7qs8dk3yfw0hteq","InstanceType":"Standard_D1_v2","PID":46639,"error":"dial tcp 10.25.64.8:2222: connect: connection refused","level":"warning","msg":"probe failed","stderr":"","stdout":"","time":"2019-02-18T18:16:43.386626115Z"}
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{"Address":"10.25.64.8","Command":"sudo crunch-run --list","Instance":"/subscriptions/zzzzzzzz-zzzz-zzzz-zzzz-zzzzzzzzzzzz/resourceGroups/c97qk/providers/Microsoft.Compute/virtualMachines/compute-5656b5905b6e0c2d20ae4145148c6b31-7qs8dk3yfw0hteq","InstanceType":"Standard_D1_v2","PID":46639,"error":"dial tcp 10.25.64.8:2222: connect: connection refused","level":"warning","msg":"probe failed","stderr":"","stdout":"","time":"2019-02-18T18:16:53.381814784Z"}
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{"Address":"10.25.64.8","Command":"sudo crunch-run --list","Instance":"/subscriptions/zzzzzzzz-zzzz-zzzz-zzzz-zzzzzzzzzzzz/resourceGroups/c97qk/providers/Microsoft.Compute/virtualMachines/compute-5656b5905b6e0c2d20ae4145148c6b31-7qs8dk3yfw0hteq","InstanceType":"Standard_D1_v2","PID":46639,"error":"Process exited with status 1","level":"warning","msg":"probe failed","stderr":"","stdout":"","time":"2019-02-18T18:17:04.897049820Z"}
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{"Address":"10.25.64.8","Command":"/bin/ls /arvados-compute-node-boot.complete  \u003e/dev/null 2\u003e\u00261 \u0026\u0026 sudo wget --quiet https://c97qk.arvadosapi.com/crunch-run --output-document=/usr/bin/crunch-run","Instance":"/subscriptions/zzzzzzzz-zzzz-zzzz-zzzz-zzzzzzzzzzzz/resourceGroups/c97qk/providers/Microsoft.Compute/virtualMachines/compute-5656b5905b6e0c2d20ae4145148c6b31-7qs8dk3yfw0hteq","InstanceType":"Standard_D1_v2","PID":46639,"level":"info","msg":"boot probe succeeded","stderr":"","stdout":"","time":"2019-02-18T18:17:33.866226306Z"}
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{"Address":"10.25.64.8","Instance":"/subscriptions/zzzzzzzz-zzzz-zzzz-zzzz-zzzzzzzzzzzz/resourceGroups/c97qk/providers/Microsoft.Compute/virtualMachines/compute-5656b5905b6e0c2d20ae4145148c6b31-7qs8dk3yfw0hteq","InstanceType":"Standard_D1_v2","PID":46639,"ProbeStart":"2019-02-18T18:17:33.357445643Z","level":"info","msg":"instance booted; will try probeRunning","time":"2019-02-18T18:17:33.866286736Z"}
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{"Address":"10.25.64.8","Instance":"/subscriptions/zzzzzzzz-zzzz-zzzz-zzzz-zzzzzzzzzzzz/resourceGroups/c97qk/providers/Microsoft.Compute/virtualMachines/compute-5656b5905b6e0c2d20ae4145148c6b31-7qs8dk3yfw0hteq","InstanceType":"Standard_D1_v2","PID":46639,"ProbeStart":"2019-02-18T18:17:33.357445643Z","RunningContainers":0,"State":"idle","level":"info","msg":"probes succeeded, instance is in service","time":"2019-02-18T18:17:33.886177977Z"}
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{"Address":"10.25.64.8","ContainerUUID":"c97qk-dz642-qxo0qjp93y2k4ht","Instance":"/subscriptions/zzzzzzzz-zzzz-zzzz-zzzz-zzzzzzzzzzzz/resourceGroups/c97qk/providers/Microsoft.Compute/virtualMachines/compute-5656b5905b6e0c2d20ae4145148c6b31-7qs8dk3yfw0hteq","InstanceType":"Standard_D1_v2","PID":46639,"Priority":1124349393114703,"level":"info","msg":"crunch-run process started","time":"2019-02-18T18:17:33.903776572Z"}
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{"Address":"10.25.64.8","ContainerUUID":"c97qk-dz642-qxo0qjp93y2k4ht","Instance":"/subscriptions/zzzzzzzz-zzzz-zzzz-zzzz-zzzzzzzzzzzz/resourceGroups/c97qk/providers/Microsoft.Compute/virtualMachines/compute-5656b5905b6e0c2d20ae4145148c6b31-7qs8dk3yfw0hteq","InstanceType":"Standard_D1_v2","PID":46639,"ProbeStart":"2019-02-18T18:19:03.315677365Z","level":"info","msg":"crunch-run process ended","time":"2019-02-18T18:19:03.334773308Z"}
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{"ContainerUUID":"c97qk-dz642-qxo0qjp93y2k4ht","PID":46639,"State":"Complete","level":"info","msg":"dropped container from queue","time":"2019-02-18T18:19:13.500015828Z"}
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{"Address":"10.25.64.8","Age":129980928971,"IdleBehavior":"run","Instance":"/subscriptions/zzzzzzzz-zzzz-zzzz-zzzz-zzzzzzzzzzzz/resourceGroups/c97qk/providers/Microsoft.Compute/virtualMachines/compute-5656b5905b6e0c2d20ae4145148c6b31-7qs8dk3yfw0hteq","InstanceType":"Standard_D1_v2","PID":46639,"State":"idle","level":"info","msg":"shutdown idle worker","time":"2019-02-18T18:21:13.255492437Z"}
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{"PID":46639,"level":"info","msg":"Will delete compute-5656b5905b6e0c2d20ae4145148c6b31-7qs8dk3yfw0hteq-nic because it is older than 20s","time":"2019-02-18T18:22:35.044805153Z"}
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{"Instance":"/subscriptions/zzzzzzzz-zzzz-zzzz-zzzz-zzzzzzzzzzzz/resourceGroups/c97qk/providers/Microsoft.Compute/virtualMachines/compute-5656b5905b6e0c2d20ae4145148c6b31-7qs8dk3yfw0hteq","PID":46639,"WorkerState":"shutdown","level":"info","msg":"instance disappeared in cloud","time":"2019-02-18T18:22:35.086986833Z"}
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{"PID":46639,"level":"info","msg":"Deleted NIC compute-5656b5905b6e0c2d20ae4145148c6b31-7qs8dk3yfw0hteq-nic","time":"2019-02-18T18:22:45.273921501Z"}
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{"PID":46639,"level":"info","msg":"Blob compute-5656b5905b6e0c2d20ae4145148c6b31-7qs8dk3yfw0hteq-os.vhd is unlocked and not modified for 209.176892224 seconds, will delete","time":"2019-02-18T18:25:33.188314532Z"}
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{"PID":46639,"level":"info","msg":"Deleted blob compute-5656b5905b6e0c2d20ae4145148c6b31-7qs8dk3yfw0hteq-os.vhd","time":"2019-02-18T18:25:33.194356552Z"}
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</pre>