Setting up consul and unbound

Create this file at /etc/unbound/local.d/consul.conf

do-not-query-localhost: no
stub-zone:
  name: "consul"
  stub-addr: 127.0.0.1@8600
server:
  domain-insecure: "consul"

Update /etc/resolv.conf

nameserver 127.0.0.1

Find the biggest file in a directory and sub-directories

$find . -type f -printf "%s\t%p\n" | sort -n | tail -1

Spring upgrade from 3.1.4.RELEASE to 4.1.4.RELEASE

• Upgrade to Spring Security 3.2.5.RELEASE

• Replace legacy XMLs

From:

<list>
  <ref local="objectName"/>
</list>

To:

<list>
  <ref bean="objectName"/>
</list>

• Remove spring-asm has been included into spring-core, any dependency has been removed see release notes for 3.2 at http://spring.io/blog/2012/09/12/spring-framework-3-2-m2-released

• Upgrade spring security version schema from 3.1 to 3.2

Checking tomcat version

$ java -cp CATALINA_BASE/lib/catalina.jar org.apache.catalina.util.ServerInfo

Sending a test message to a Kafka cluster

$ /usr/local/Cellar/kafka/0.8.1.1/bin/kafka-producer-perf-test.sh --broker-list localhost:9092 --topic  --messages 1 --producer-num-retries 1

Git merge replacing local changes with 'theirs'

$ git merge -s recursive -Xtheirs <branch_name>

Setting up a MongoDB replica set

• All nodes have to be started with this flag --replSet "clusterName"
• In one of the nodes, execute the following commands

  $ mongo
  > rs.initiate()
  > rs.add("hostname1")
  > rs.add("hostname2")
  

• This command will allow you to execute queries in a slave node

  > rs.slaveOk()
  

• This command will show you the status of the cluster

  > rs.status()