Muchos automates setting up Apache Accumulo or Apache Fluo (and their dependencies) on a cluster

Muchos makes it easy to launch a cluster in Amazon's EC2 or Microsoft Azure and deploy Accumulo or Fluo to it. Muchos enables developers to experiment with Accumulo or Fluo in a realistic, distributed environment. Muchos installs all software using tarball distributions which makes its easy to experiment with the latest versions of Accumulo, Hadoop, Zookeeper, etc without waiting for downstream packaging.

Muchos is not recommended at this time for production environments as it has no support for updating and upgrading dependencies. It also has a wipe command that is great for testing but dangerous for production environments.

Muchos is structured into two high level components:

• Ansible scripts that install and configure Fluo and its dependencies on a cluster.
• Python scripts that push the Ansible scripts from a local development machine to a cluster and run them. These Python scripts can also optionally launch a cluster in EC2 using boto or in Azure using Azure CLI.

Checkout Uno for setting up Accumulo or Fluo on a single machine.

Requirements

Common

Muchos requires the following common components for installation and setup:

• Python 3 with a virtual environment setup Create a Python 3 environment and switch to it. (We tested using Python 3.6.8, but this should work in later versions as well. If you encounter problems, please file an issue.)

cd ~
python3.6 -m venv env
source env/bin/activate

• ssh-agent installed and running and ssh-agent forwarding. Note that this may also require the creation of SSH public-private key pair.

eval $(ssh-agent -s)
ssh-add ~/.ssh/id_rsa

• Git (current version)

EC2

Muchos requires the following for EC2 installations:

• awscli & boto3 libraries - Install using pip3 install awscli boto3 --upgrade --user
• An AWS account with your SSH public key uploaded. When you configure muchos.props, set key.name to name of your key pair in AWS.
• ~/.aws configured on your machine. Can be created manually or using aws configure.

Azure

Muchos requires the following for Azure installations:

• Azure CLI must be installed, configured and authenticated to an Azure subscription. Please note - you should install Azure CLI 2.0.69 on CentOS. Higher versions of Azure CLI are unsupported for Muchos on CentOS at this time until this issue in the Azure CLI 2.0.70 is fixed. Example command to install Azure CLI 2.0.69 on CentOS is below:

wget https://packages.microsoft.com/yumrepos/azure-cli/azure-cli-2.0.69-1.el7.x86_64.rpm
sudo yum install azure-cli-2.0.69-1.el7.x86_64.rpm

• An Azure account with permissions to either use an existing or create new Resource Groups, Virtual Networks and Subnets
• A machine which can connect to securely deploy the cluster in Azure.
• Install Ansible for Azure within the Python virtual environment by using pip install ansible[azure]

Quickstart

The following commands will install Muchos, launch a cluster, and setup/run Accumulo:

git clone https://github.com/apache/fluo-muchos.git

cd fluo-muchos/
cp conf/muchos.props.example conf/muchos.props
vim conf/muchos.props                                   # Edit to configure Muchos cluster
./bin/muchos launch -c mycluster                        # Launches Muchos cluster in EC2 or Azure
./bin/muchos setup                                      # Set up cluster and start Accumulo

The launch command will create a cluster with the name specified in the command (e.g. 'mycluster'). The setup command can be run repeatedly to fix any failures and will not repeat successful operations.

After your cluster is launched, SSH to it using the following command:

./bin/muchos ssh

Run the following command to terminate your cluster. WARNING: All cluster data will be lost.

./bin/muchos terminate

Please continue reading for more detailed Muchos instructions.

Launching an EC2 cluster

Before launching a cluster, you will need to complete the requirements above, clone the Muchos repo, and create muchos.props. If you want to give others access to your cluster, add their public keys to a file named keys in your conf/ directory. During the setup of your cluster, this file will be appended on each node to the ~/.ssh/authorized_keys file for the user set by the cluster.username property.

You might also need to configure the aws_ami property in muchos.props. Muchos by default uses a free CentOS 7 image that is hosted in the AWS marketplace but managed by the CentOS organization. If you have never used this image in EC2 before, you will need to go to the CentOS 7 product page to accept the software terms. If this is not done, you will get an error when you try to launch your cluster. By default, the aws_ami property is set to an AMI in us-east-1. You will need to changes this value if a newer image has been released or if you are running in different region than us-east-1.

After following the steps above, run the following command to launch an EC2 cluster called mycluster:

./bin/muchos launch -c mycluster

After your cluster has launched, you do not have to specify a cluster anymore using -c (unless you have multiple clusters running).

Run the following command to confirm that you can ssh to the leader node:

./bin/muchos ssh

You can check the status of the nodes using the EC2 Dashboard or by running the following command:

./bin/muchos status

Launching an Azure cluster

Before launching a cluster, you will need to complete the requirements for Azure above, clone the Muchos repo, and create muchos.props by making a copy of existing [muchos.props.example]. If you want to give others access to your cluster, add their public keys to a file named keys in your conf/ directory. During the setup of your cluster, this file will be appended on each node to the ~/.ssh/authorized_keys file for the user set by the cluster.username property. You will also need to ensure you have authenticated to Azure and set the target subscription using the Azure CLI.

Muchos by default uses a CentOS 7 image that is hosted in the Azure marketplace. The Azure Linux Agent is already pre-installed on the Azure Marketplace images and is typically available from the distribution's package repository. Azure requires that the publishers of the endorsed Linux distributions regularly update their images in the Azure Marketplace with the latest patches and security fixes, at a quarterly or faster cadence. Updated images in the Azure Marketplace are available automatically to customers as new versions of an image SKU.

Edit the values in the sections within muchos.props as below Under the general section, edit following values as per your configuration

• cluster_type = azure
• cluster_user should be set to the name of the administrative user
• proxy_hostname (optional) is the name of the machine which has access to the cluster VNET

Under the azure section, edit following values as per your configuration

• resource_group to provide the resource-group name for the cluster deployment. A new resource group with this name will be created if it doesn't already exist
• vnet to provide the name of the VNET that your cluster nodes should use. A new VNET with this name will be created if it doesn't already exist
• subnet to provide a name for the subnet within which the cluster resources will be deployed
• numnodes to change the cluster size in terms of number of nodes deployed
• vm_sku to specify the VM size to use. You can choose from the available VM sizes.

Within Azure the nodes section is auto populated with the hostnames and their default roles.

After following the steps above, run the following command to launch an Azure VMSS cluster called mycluster (where 'mycluster' is the name assigned to your cluster):

.bin/muchos launch -c `mycluster` # Launches Muchos cluster in Azure

Set up the cluster

Once your cluster is built in EC2 or Azure, the ./bin/muchos setup command will set up your cluster and start Hadoop, Zookeeper & Accumulo. It will download release tarballs of Fluo, Accumulo, Hadoop, etc. The versions of these tarballs are specified in muchos.props and can be changed if desired.

Optionally, Muchos can setup the cluster using an Accumulo or Fluo tarball that is placed in the conf/upload directory of Muchos. This option is only necessary if you want to use an unreleased version of Fluo or Accumulo. Before running the muchos setup command, you should confirm that the hash (typically SHA-512 or SHA-256) of your tarball matches what is set in conf/checksums. Run the command shasum -a 512 /path/to/tarball on your tarball to determine its hash. The entry in conf/checksums can optionally include the algorithm as a prefix. If the algorithm is not specified then Muchos will infer the algorithm based on the length of the hash. Currently Muchos supports using sha512 / sha384 / sha256 / sha224 / sha1 / md5 hashes for the checksum.

The muchos setup command will install and start Accumulo, Hadoop, and Zookeeper. The optional services below will only be set up if configured in the [nodes] section of muchos.props:

1. fluo - Fluo only needs to be installed and configured on a single node in your cluster as Fluo applications are run in YARN. If set as a service, muchos setup will install and partially configure Fluo but not start it. To finish setup, follow the steps in the 'Run a Fluo application' section below.

2. metrics - The Metrics service installs and configures collectd, InfluxDB and Grafana. Cluster metrics are sent to InfluxDB using collectd and are viewable in Grafana. If Fluo is running, its metrics will also be viewable in Grafana.

3. spark - If specified on a node, Apache Spark will be installed on all nodes and the Spark History server will be run on this node.

4. mesosmaster - If specified, a Mesos master will be started on this node and Mesos slaves will be started on all workers nodes. The Mesos status page will be viewable at http://<MESOS_MASTER_NODE>:5050/. Marathon will also be started on this node and will be viewable at http://<MESOS_MASTER_NODE>:8080/.

5. client - Used to specify a client node where no services are run but libraries are installed to run Accumulo/Hadoop clients.

6. swarmmanager - Sets up Docker swarm with the manager on this node and joins all worker nodes to this swarm. When this is set, docker will be installed on all nodes of the cluster. It is recommended that the swarm manager is specified on a worker node as it runs docker containers. Check out Portainer if you want to run a management UI for your swarm cluster.

If you run the muchos setup command and a failure occurs, you can repeat the command until setup completes. Any work that was successfully completed will not be repeated. While some setup steps can take over a minute, use ctrl-c to stop setup if it hangs for a long time. Just remember to run muchos setup again to finish setup.

Manage the cluster

The setup command is idempotent. It can be run again on a working cluster. It will not change the cluster if everything is configured and running correctly. If a process has stopped, the setup command will restart the process.

The ./bin/muchos wipe command can be used to wipe all data from the cluster and kill any running processes. After running the wipe command, run the setup command to start a fresh cluster.

If you set proxy_socks_port in your muchos.props, a SOCKS proxy will be created on that port when you use muchos ssh to connect to your cluster. If you add a proxy management tool to your browser and whitelist http://leader*, http://worker* and http://metrics* to redirect traffic to your proxy, you can view the monitoring & status pages below in your browser. Please note - The hosts in the URLs below match the configuration in [nodes] of muchos.prop.example and may be different for your cluster.

• NameNode status - http://leader1:9870/
• ResourceManger status - http://leader2:8088/cluster
• Accumulo monitor - http://leader3:9995/
• Spark History Server - http://leader2:18080/
• Grafana Metrics and Monitoring - http://metrics:3000/
• Mesos status - http://leader1:5050/ (if mesosmaster configured on leader1)
• Marathon status - http://leader1:8080/ (if mesosmaster configured on leader1)

Run a Fluo application

Running an example Fluo application like WebIndex, Phrasecount, or Stresso is easy with Muchos as it configures your shell with common environment variables. To run an example application, SSH to a node on cluster where Fluo is installed and clone the example repo:

./bin/muchos ssh                      # SSH to cluster proxy node
ssh <node where Fluo is installed>    # Nodes with Fluo installed is determined by Muchos config
hub clone apache/fluo-examples        # Clone repo of Fluo example applications. Press enter for user/password.

Start the example application using its provided scripts. To show how simple this can be, commands to run the WebIndex application are shown below. Read the WebIndex README to learn more before running these commands.

cd fluo-examples/webindex
./bin/webindex init                   # Initialize and start webindex Fluo application
./bin/webindex getpaths 2015-18       # Retrieves CommonCrawl paths file for 2015-18 crawl
./bin/webindex load-s3 2015-18 0-9    # Load 10 files into Fluo in the 0-9 range of 2015-18 crawl
./bin/webindex ui                     # Runs the WebIndex UI

If you have your own application to run, you can follow the Fluo application instructions to configure, initialize, and start your application. To automate these steps, you can mimic the scripts of example Fluo applications above.

Customize your cluster

After ./bin/muchos setup is run, users can install additional software on the cluster using their own Ansible playbooks. In their own playbooks, users can reference any configuration in the Ansible inventory file at /etc/ansible/hosts which is set up by Muchos on the proxy node. The inventory file lists the hosts for services on the cluster such as the Zookeeper nodes, Namenode, Accumulo master, etc. It also has variables in the [all:vars] section that contain settings that may be useful in user playbooks. It is recommended that any user-defined Ansible playbooks should be managed in their own git repository (see mikewalch/muchos-custom for an example).

High-Availability (optional)

Additionally, Muchos can be configured to provide High-Availability for HDFS & Accumulo components. By default, this feature is off, however it can be turned on by editing the following settings in muchos.props under the general section as shown below:

hdfs_ha = True                        # default is False
nameservice_id = muchoshacluster      # Logical name for the cluster, no special characters

Before enabling HA, it is strongly recommended you read the Apache doc for HDFS HA & Accumulo HA

Also in the [nodes] section of muchos.props ensure the journalnode and zkfc service are configured to run.

Terminating your cluster

If you launched your cluster, run the following command to terminate your cluster. WARNING - All data on your cluster will be lost:

./bin/muchos terminate

Note: The terminate command is currently unsupported for Azure based clusters. Instead, you should delete underlying Azure VMSS resources when you need to terminate the cluster.

Automatic shutdown of clusters

With the default configuration, clusters will not shutdown automatically after a delay and the default shutdown behavior will be stopping the node. If you would like your cluster to terminate after 8 hours, set the following configuration in muchos.props:

shutdown_delay_minutes = 480
shutdown_behavior = terminate

If you decide later to cancel the shutdown, run muchos cancel_shutdown.

Retrieving cluster configuration

The config command allows you to retrieve cluster configuration for your own scripts:

$ ./bin/muchos config -p leader.public.ip
10.10.10.10

Powered by

Muchos is powered by the following projects:

• boto - Python library used by muchos launch to start a cluster in AWS EC2.
• ansible - Cluster management tool that is used by muchos setup to install, configure, and start Fluo, Accumulo, Hadoop, etc on an existing EC2 or bare metal cluster.
• azure-cli - The Azure CLI is a command-line tool for managing Azure resources.
• ansible-azure - Ansible includes a suite of modules for interacting with Azure Resource Manager.

Muchos Testing

Muchos has unit tests. To run them, first install nose using pip:

pip install nose

The following command runs the unit tests:

nosetests -w lib/