Usage

Configuration

For OpenStack scenarios the connection is configured using standard openrc file (refer to http://docs.openstack.org/cli-reference/common/cli_set_environment_variables_using_openstack_rc.html on how to retrieve it). The config can be passed to Shaker rather by sourcing into system env source openrc or via set of CLI parameters --os-project-name, --os-username, --os-password, --os-auth-url and --os-region-name. Connection to SSL endpoints is configured by parameters --os-cacert and --os-insecure (to disable certificate verification). Configuration can also be specified in config file, refer to Shaker config parameters. Config file name can be passed by parameter --config-file.

Note

Shaker is better run under user with admin privileges. However, it’s possible to run under ordinary user too - refer to Running Shaker by non-admin user

Common Parameters

The following parameters are applicable for both OpenStack mode (shaker) and spot mode (shaker-spot).

  1. Run the scenario with defaults and generate interactive report into file report.html:
shaker --scenario <scenario> --report report.html
  1. Run the scenario and store raw result:
shaker --scenario <scenario> --output output.json
  1. Run the scenario and store SLA verification results in subunit stream file:
shaker --scenario <scenario> --subunit report.subunit
  1. Generate report from the raw data:
shaker-report --input output.json --output report.html

Scenario Explained

Shaker scenario is file in YAML format. It describes how agents are deployed (at OpenStack instances or statically) and sequence of tests to execute. When agents are deployed at OpenStack instances a reference to Heat template is provided.

description:
  This scenario launches pairs of VMs in the same private network. Every VM is
  hosted on a separate compute node.

deployment:
  template: l2.hot
  accommodation: [pair, single_room]

execution:
  progression: quadratic
  tests:
  -
    title: Iperf TCP
    class: iperf_graph
    time: 60

Deployment

By default Shaker spawns instances on every available compute node. The distribution of instances is configured by parameter accommodation. There are several instructions that allow control the scheduling precisely:

  • pair - instances are grouped in pairs, meaning that one can be used as source of traffic and the other as a consumer (needed for networking tests)
  • single_room - 1 instance per compute node
  • double_room - 2 instances per compute node
  • density: N - the multiplier for number of instances per compute node
  • compute_nodes: N - how many compute nodes should be used (by default Shaker use all of them)
  • zones: [Z1, Z2] - list of Nova availability zones to use

Examples:

_images/accommodation_single_room.svg_images/accommodation_double_room.svg

As result of deployment the set of agents is produced. For networking testing this set contains agents in master and slave roles. Master agents are controlled by shaker tool and execute commands. Slaves are used as back-ends and do not receive any commands directly.

Execution

The execution part of scenario contains a list of tests that are executed one by one. By default Shaker runs the test simultaneously on all available agents. The level of concurrency can be controlled by option progression. There are 3 values available:

  • no value specified - all agents are involved;
  • linear - the execution starts with 1 agent and increases by 1 until all agents are involved;
  • quadratic - the execution starts with 1 agent (or 1 pair) and doubles until all agents are involved.

Tests are executed in order of definition. The exact action is defined by option class, additional attributes are provided by respective parameters. The following classes are available:

  • iperf3 - runs iperf3 tool and shows chart and statistics
  • flent - runs flent (http://flent.org) and shows chart and statistics
  • iperf - runs iperf tool and shows plain output
  • netperf - runs netpers tool and shows plain output
  • shell - runs any shell command or process and shows plain output
  • iperf_graph - runs iperf tool and shows chart and statistics (deprecated)

Test classes

Tools are configured via key-value attributes in test definition. For all networking tools Shaker offers unified parameters, that are translated automatically.

iperf3, iperf, iperf_graph:

  • time - time in seconds to transmit for, defaults to 60
  • udp - use UDP instead of TCP, defaults to TCP
  • interval - seconds between periodic bandwidth reports, defaults to 1 s
  • bandwidth - for UDP, bandwidth to send at in bits/sec, defaults to 1 Mbit/s
  • threads - number of parallel client threads to run
  • host - the address of destination host to run the tool against, defaults to IP address of slave agent
  • datagram_size - the size of UDP datagrams
  • mss - set TCP maximum segment size

flent:

  • time - time in seconds to transmit for, defaults to 60
  • interval - seconds between periodic bandwidth reports, defaults to 1
  • method - which flent scenario to use, see https://github.com/tohojo/flent/tree/master/flent/tests for the whole list, defaults to tcp_download
  • host - the address of destination host to run the tool against, defaults to IP address of slave agent

netperf:

  • time - time in seconds to transmit for, defaults to 60
  • method - one of built-in test names, see http://linux.die.net/man/1/netperf for the whole list, defaults to TCP_STREAM
  • host - the address of destination host to run the tool against, defaults to IP address of slave agent

shell:

  • program - run single program
  • script - run bash script

SLA validation

Test case can contain SLA rules that are calculated upon test completion. Every rule has 2 parts: record selector and condition. The record selector allows to filter only subset of all records, e.g. of type agent to filter records produced by a single agent. The condition applies to particular statistics.

SLA examples:
  • [type == 'agent'] >> (stats.bandwidth.min > 1000) - require min bandwidth on every agent be at least 1000 Mbit
  • [type == 'agent'] >> (stderr == '') - require stderr to be empty

Results of SLA validation can be obtained by generating output in subunit format. To do this a file name should be provided via –subunit parameter.