Using confluent cli to start/stop a single node Kafka cluster

Install steps for Confluent Platform are here.

Using confluent cli:

confluent local status
$ confluent local start
The local commands are intended for a single-node development environment
only, NOT for production usage. https://docs.confluent.io/current/cli/index.html
Using CONFLUENT_CURRENT: /tmp/confluent.9Uym9FYU
Starting zookeeper
zookeeper is [UP]
Starting kafka
kafka is [UP]
Starting schema-registry
schema-registry is [UP]
Starting kafka-rest
kafka-rest is [UP]
Starting connect
connect is [UP]
Starting ksql-server
ksql-server is [UP]
Starting control-center
control-center is [UP]
confluent local stop

awk basics

I’ve tinkered with awk and sed for quick one off tasks before in the past but I always have to go back and check the syntax for awk as it’s one of those things I use only once in a while.

Some quick notes for reference for later:

  • awk splits records in an input file by default by white space chars
  • uses $0 to refer to a whole line, and $1 … $n to refer to each matching token on a line
  • to split using column delimiters other than whitespace use -F

Examples:

Example file – example1.txt:

aaa bbb ccc
ddd eee fff

$ awk {'print $1'} example1.txt

Will print the first matching column:

aaa
ddd

If file has other column delimiters use -F to specify the delimiter, for example, example2.txt:

aaa,bbb,ccc
ddd,eee,fff

$ awk -F , {'print $2'} example2.txt

Will match column 2:

bbb
eee

More info on awk here.