This is a set of Chef cookbooks to bring up Hadoop and Kafka clusters. In addition, there are a number of additional services provided with these cookbooks - such as DNS, metrics, and monitoring - see below for a partial list of services provided by these cookbooks.
Each Hadoop head node is Hadoop component specific. The roles are intended to
be run so that they can be layered in a highly-available manner. E.g. multiple
BCPC-Hadoop-Head-* machines will correctly build a MySQL, Zookeeper, HDFS
JournalNode, etc. cluster and deploy the named component as well. Further,
for components which support HA, the intention is one can simply add the
role to multiple machines and the right thing will be done to support HA
(except in the case of HDFS).
To setup HDFS HA, please follow the following model from your Bootstrap VM:
- Install the cluster once with a non-HA HDFS:
- with a BCPC-Hadoop-Head-Namenode-NoHA role
- with the following node variable [:bcpc][:hadoop][:hdfs][:HA] = false
- ensure at least three machines are installed with BCPC-Hadoop-Head roles
- ensure at least one machine is a datanode
- run
cluster-assign-roles.sh <Environment> Hadoopsuccessfully
- Re-configure the cluster with an HA HDFS:
- change the BCPC-Hadoop-Head-Namenode-NoHA machine's role to BCPC-Hadoop-Head-Namenode
- set the following node variable [:bcpc][:hadoop][:hdfs][:HA] = true on all nodes (e.g. in the environment)
- run
cluster-assign-roles.sh <Environment> Hadoopsuccessfully
These recipes are currently intended for building a BACH cluster on top of Ubuntu 14.04 servers using Chef 11. When setting this up in VMs, be sure to add a few dedicated disks (for HDFS data nodes) aside from boot volume.
You should look at the various settings in cookbooks/bcpc/attributes/default.rb
and tweak accordingly for your setup (by adding them to an environment file).
The provided scripts which sets up a chef-server via Vagrant.
Once the Chef server is set up, you can bootstrap any number of nodes to get them registered with the Chef server for your environment - see the next section for enrolling the nodes.
To build a new BACH cluster, you have to start with building head nodes
first. (This assumes that you have already completed the bootstrap process and
have a Chef server available.) Since the recipes will automatically generate
all passwords and keys for this new cluster, the nodes must temporarily become
admin's in the chef server, so that the recipes can write the generated info
to a databag. The databag will be called configs and the databag item will
be the same name as the environment (Test-Laptop in this example). You only
need to leave the node as an admin for the first chef-client run. You can
also manually create the databag & item (as per the example in
data_bags/configs/Example.json) and manually upload it if you'd rather not
bother with the whole admin thing for the first run.
To assign machines a role, one can update the cluster.txt file and ensure
all necessary information is provided as per cluster-readme.txt.
Using the script tests/automated_install.sh, one can run through what is the expected "happy-path" install for a single machine running (by default) four Vagrant VMs. This simple install supports only changing DNS, proxy and VM resource settings. (This is the basis of our automated build tests.)
Note: To run more than one test cluster at a time with VirtualBox:
One may export BACH_CLUSTER_PREFIX to set their desired cluster name
prefix. This will set the namespace so that the cluster's virtual machines
do not collide on the hypervisor. Resulting in names following the
convention:
${BACH_CLUSTER_PREFIX}-bcpc-bootstrap
${BACH_CLUSTER_PREFIX}-bcpc-vm1
${BACH_CLUSTER_PREFIX}-bcpc-vm2
${BACH_CLUSTER_PREFIX}-bcpc-vm3
Lacking a $BACH_CLUSTER_PREFIX tests/automated_install.sh
will not assign a cluster prefix to the cluster hosts or bootstrap.
One also needs to ensure their management, float and storage
network ranges differ between clusters in the environment and cluster.txt)
-- update them to be unique. Further, one needs to have each cluster's
repository in a different parent directory (to avoid the cluster
directory from colliding).
Note: For man-in-the-middle proxy or local repository users:
One need ensure local SSL certificate authority certificates are located on
your hypervisor at /usr/local/share/ca-certificates this will populate
your bootstrap with the necessary certificates. Further, to not use a
proxy for specific hosts, one can set $additional_no_proxy to a comma
separated list of hosts or *-wildcard domains.
(This is specifically useful for local APT, Maven or Ruby repositories.)
In addition to the "happy-path" integration test using automated_install.sh there are ways to deploy to bare-metal hosts. Lastly, for those using test-kitchen there are various test-kitchen suites one can run as well.
A view of the various full-cluster deployment types:
Once the nodes are configured and bootstrapped, BACH services will be accessible via the floating IP. (For the Test-Laptop environment, it is 10.0.100.5.)
For example, you can go to https://10.0.100.5:8888 for the Graphite
web interface. To find the automatically-generated service credentials, look
in the data bag for your environment.
vagrant@bootstrap:~$ knife data bag show configs Test-Laptop | grep mysql-root-password
mysql-root-password: abcdefgh
For example, to check on HDFS:
vagrant@bcpc-vm1:~$ HADOOP_USER_NAME=hdfs hdfs dfsadmin -report
Configured Capacity: 40781217792 (37.98 GB)
Present Capacity: 40114298221 (37.36 GB)
DFS Remaining: 39727463789 (37.00 GB)
DFS Used: 386834432 (368.91 MB)
DFS Used%: 0.96%
Under replicated blocks: 0
Blocks with corrupt replicas: 0
Missing blocks: 0
-------------------------------------------------
Live datanodes (1):
Name: 10.0.100.13:50010 (bcpc-vm3.bcpc.example.com)
Hostname: bcpc-vm3.bcpc.example.com
Decommission Status : Normal
Configured Capacity: 40781217792 (37.98 GB)
DFS Used: 386834432 (368.91 MB)
Non DFS Used: 666919571 (636.02 MB)
DFS Remaining: 39727463789 (37.00 GB)
DFS Used%: 0.95%
DFS Remaining%: 97.42%
Configured Cache Capacity: 0 (0 B)
Cache Used: 0 (0 B)
Cache Remaining: 0 (0 B)
Cache Used%: 100.00%
Cache Remaining%: 0.00%
Xceivers: 12
Last contact: Fri Aug 14 21:08:23 EDT 2015
The philosophy behind BACH cluster operation is that no single machine is special and all services are multi-master or have sufficiently fast failover to prevent failure in application data paths and availability. Commits to the codebase should be deployable without requiring path dependence from the previous repository state. For example, a machine should be able to be PXE-booted fresh into a particular version of the code, while an existing machine should be able to simply run Chef to upgrade into a particular Chef-BACH version. Unhealthy machines should always be able to be torn down and reinstalled from scratch without disruption. Any Chef-BACH version which requires manual interaction is considered BREAKING (as a GitHub tag) and should be avoided as much as possible; our mantra is that all operations are handled automatically. All services should be secured and kerberized as appropriate. Yet, testing should be done both with a kerberized VM cluster.
BACH currently relies upon a number of open-source packages:
- Apache Bigtop
- Apache Hadoop
- Apache HBase
- Apache Hive
- Apache HTTP Server
- Apache Kafka
- Apache Oozie
- Apache Phoenix
- Apache Pig
- Apache Spark
- Apache Sqoop
- Apache Tez
- Apache Zookeeper
- Sentric Hannibal
- Twitter HDFS-DU
- Chef
- HAProxy
- Keepalived
- Percona XtraDB Cluster
- PowerDNS
- Ubuntu
- Vagrant - Verified with version 2.1.2
- Zabbix
Thanks to all of these communities for producing this software!
See our contributing document for more.
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