Igor Soarez created KAFKA-12866:
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Summary: Kafka requires ZK root access even when using a chroot
Key: KAFKA-12866
URL: https://issues.apache.org/jira/browse/KAFKA-12866
Project: Kafka
Issue Type: Bug
Components: core, zkclient
Affects Versions: 2.6.2, 2.7.1, 2.8.0, 2.6.1
Reporter: Igor Soarez
When a Zookeeper chroot is configured, users do not expect Kafka to need
Zookeeper access outside of that chroot.
h1. Why is this important?
A zookeeper cluster may be shared with other Kafka clusters or even other
applications. It is an expected security practice to restrict each
cluster/application's access to it's own Zookeeper chroot.
h1. Steps to reproduce
h2. Zookeeper setup
Using the zkCli, create a chroot for Kafka, make it available to Kafka but lock
the root znode.
{{ [zk: localhost:2181(CONNECTED) 1] create /somechroot }}
{{ Created /some}}
{{ [zk: localhost:2181(CONNECTED) 2] setAcl /somechroot world:anyone:cdrwa}}
{{ [zk: localhost:2181(CONNECTED) 3] addauth digest test:12345}}
{{ [zk: localhost:2181(CONNECTED) 4] setAcl /
digest:test:Mx1uO9GLtm1qaVAQ20Vh9ODgACg=:cdrwa}}
h2. Kafka setup
Configure the chroot in broker.properties:
{{zookeeper.connect=localhost:2181/somechroot}}
h2. Expected behavior
The expected behavior here is that Kafka will use the chroot without issues.
h2. Actual result
Kafka fails to start with a fatal exception:
{{ org.apache.zookeeper.KeeperException$NoAuthException: KeeperErrorCode =
NoAuth for /chroot}}
{{ at org.apache.zookeeper.KeeperException.create(KeeperException.java:120)}}
{{ at org.apache.zookeeper.KeeperException.create(KeeperException.java:54)}}
{{ at kafka.zookeeper.AsyncResponse.maybeThrow(ZooKeeperClient.scala:583)}}
{{ at kafka.zk.KafkaZkClient.createRecursive(KafkaZkClient.scala:1729)}}
{{ at
kafka.zk.KafkaZkClient.makeSurePersistentPathExists(KafkaZkClient.scala:1627)}}
{{ at kafka.zk.KafkaZkClient$.apply(KafkaZkClient.scala:1957)}}
{{ at
kafka.zk.ZkClientAclTest.testChrootExistsAndRootIsLocked(ZkClientAclTest.scala:60)}}
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