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DOCKER_UTILS.md

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docker-utils

##Overview

This is set of utilites which are used by the Confluent Docker images. It has two command line utilities which are used for testing if a Zookeeper or Kafka cluster is healthy and ready to accept client requests.

##How does it work ?

zk-ready

This command tries to connect to the cluster and waits for events which signify if the Zookeeper ensemble is ready.

SASL Enabled ? Zookeeper Events
No SyncConnected
Yes SyncConnected, SaslAuthenticated

kafka-ready This command sends a metadata query to the broker and verifies that expected number of brokers are present.

##How to package / run ?

  1. Create a jar with dependencies

      mvn clean compile assembly:single

How to test ?

  1. JUnit tests: mvn test

Client.properties

@@ -1,146 +0,0 @@ bootstrap.servers A list of host/port pairs to use for establishing the initial connection to the Kafka cluster. The client will make use of all servers irrespective of which servers are specified here for bootstrapping—this list only impacts the initial hosts used to discover the full set of servers. This list should be in the form host1:port1,host2:port2,.... Since these servers are just used for the initial connection to discover the full cluster membership (which may change dynamically), this list need not contain the full set of servers (you may want more than one, though, in case a server is down).

  • Type: list
  • Default:
  • Importance: high

ssl.key.password The password of the private key in the key store file. This is optional for client.

  • Type: password
  • Importance: high

ssl.keystore.location The location of the key store file. This is optional for client and can be used for two-way authentication for client.

  • Type: string
  • Importance: high

ssl.keystore.password The store password for the key store file.This is optional for client and only needed if ssl.keystore.location is configured.

  • Type: password
  • Importance: high

ssl.truststore.location The location of the trust store file.

  • Type: string
  • Importance: high

ssl.truststore.password The password for the trust store file.

  • Type: password
  • Importance: high

sasl.kerberos.service.name The Kerberos principal name that Kafka runs as. This can be defined either in Kafka's JAAS config or in Kafka's config.

  • Type: string
  • Importance: medium

sasl.mechanism SASL mechanism used for client connections. This may be any mechanism for which a security provider is available. GSSAPI is the default mechanism.

  • Type: string
  • Default: "GSSAPI"
  • Importance: medium

security.protocol Protocol used to communicate with brokers. Valid values are: PLAINTEXT, SSL, SASL_PLAINTEXT, SASL_SSL.

  • Type: string
  • Default: "PLAINTEXT"
  • Importance: medium

ssl.enabled.protocols The list of protocols enabled for SSL connections.

  • Type: list
  • Default: [TLSv1.2, TLSv1.1, TLSv1]
  • Importance: medium

ssl.keystore.type The file format of the key store file. This is optional for client.

  • Type: string
  • Default: "JKS"
  • Importance: medium

ssl.protocol The SSL protocol used to generate the SSLContext. Default setting is TLS, which is fine for most cases. Allowed values in recent JVMs are TLS, TLSv1.1 and TLSv1.2. SSL, SSLv2 and SSLv3 may be supported in older JVMs, but their usage is discouraged due to known security vulnerabilities.

  • Type: string
  • Default: "TLS"
  • Importance: medium

ssl.provider The name of the security provider used for SSL connections. Default value is the default security provider of the JVM.

  • Type: string
  • Importance: medium

ssl.truststore.type The file format of the trust store file.

  • Type: string
  • Default: "JKS"
  • Importance: medium

sasl.kerberos.kinit.cmd Kerberos kinit command path.

  • Type: string
  • Default: "/usr/bin/kinit"
  • Importance: low

sasl.kerberos.min.time.before.relogin Login thread sleep time between refresh attempts.

  • Type: long
  • Default: 60000
  • Importance: low

sasl.kerberos.ticket.renew.jitter Percentage of random jitter added to the renewal time.

  • Type: double
  • Default: 0.05
  • Importance: low

sasl.kerberos.ticket.renew.window.factor Login thread will sleep until the specified window factor of time from last refresh to ticket's expiry has been reached, at which time it will try to renew the ticket.

  • Type: double
  • Default: 0.8
  • Importance: low

ssl.cipher.suites A list of cipher suites. This is a named combination of authentication, encryption, MAC and key exchange algorithm used to negotiate the security settings for a network connection using TLS or SSL network protocol.By default all the available cipher suites are supported.

  • Type: list
  • Importance: low

ssl.endpoint.identification.algorithm The endpoint identification algorithm to validate server hostname using server certificate.

  • Type: string
  • Importance: low

ssl.keymanager.algorithm The algorithm used by key manager factory for SSL connections. Default value is the key manager factory algorithm configured for the Java Virtual Machine.

  • Type: string
  • Default: "SunX509"
  • Importance: low

ssl.trustmanager.algorithm The algorithm used by trust manager factory for SSL connections. Default value is the trust manager factory algorithm configured for the Java Virtual Machine.

  • Type: string
  • Default: "PKIX"
  • Importance: low