Confluent System Requirements¶
The following machine recommendations are for installing individual Confluent Platform components:
|Control Center-Normal mode||1||300 GB, preferably SSDs||32 GB RAM (JVM default 6 GB)||12 cores or more|
|Control Center-Reduced infrastructure mode||1||128 GB, preferably SSDs||8 GB RAM (JVM default 4 GB)||4 cores or more|
||64 GB RAM||Dual 12 core sockets|
|Connect||2||Only required for installation||0.5 - 4 GB heap size depending on connectors||Typically not CPU- bound. More cores is better than faster cores.|
|Replicator||Same as Connect for nodes, storage, memory, and CPU. (See note below regarding AWS.)|
|ksqlDB||2||Use SSD. Sizing depends on the number of concurrent queries and the aggregation performed.||20 GB RAM||4 cores|
|REST Proxy||2||Only required for installation||1 GB overhead plus 64 MB per producer and 16 MB per consumer||16 cores to handle HTTP requests in parallel and background threads for consumers and producers.|
|Schema Registry||2||Only required for installation||1 GB heap size||Typically not CPU- bound. More cores is better than faster cores.|
Each write to ZooKeeper must be persisted in the transaction log before the client gets an ack.
Using SSD reduces the ZooKeeper write latency.
|4 GB RAM||2-4 cores|
- In the above table, the recommended CPU resource is in CPU units which are the same in all platforms. For example, if we recommend 12 CPUs for non-Kubernetes environment, the recommendation for Kubernetes environment would be 12 CPU units, as well.
- If you want to use RAID disks, the recommendation is:
- RAID 1 and RAID 10: Preferred
- RAID 0: 2nd preferred
- RAID 5: Not recommended
If deploying Confluent Platform on AWS VMs and running Replicator as a connector, be aware that VMs with burstable CPU types (T2, T3, T3a, and T4g) will not support high throughput streaming workloads. Replicator worker nodes running on these VMs experience throughput degradation due to credits expiring, making these VMs unsuitable for Confluent Platform nodes expected to run at elevated CPU levels for a sustained period of time, and supporting workloads that are above and beyond their baseline resource rates.
- For the requirements specific to Confluent for Kubernetes, see CFK Cluster Sizing.
|RHEL/CentOS 7.x (deprecated *)||yes||yes||yes||yes||yes||yes||yes||yes||yes|
|Debian 9 (stretch)||yes||yes||yes||yes||yes||yes||yes||yes||yes|
|Debian 10 (buster)||yes||yes||yes||yes||no||no||no||no||no|
|Ubuntu 16.04 LTS (xenial)||yes||yes||yes||yes||yes||yes||yes||yes||yes|
|Ubuntu 18.04 LTS (bionic)||yes||yes||yes||yes||yes||yes||yes||yes||yes|
|Ubuntu 20.04 LTS (focal)||yes||yes||yes||yes||no||no||no||no||no|
- * Support for RHEL/CentOS 7.x is deprecated because RHEL/CentOS 7.x has reached the end of life. The OS is currently supported for Confluent Platform 7.3, but the support will be discontinued at a near future Confluent Platform release.
It is recommended that you run Confluent Platform across uniform OS, Confluent Platform, and JAVA versions.
- Confluent Platform is supported on RHEL, CentOS, Debian and Ubuntu Linux Operating Systems. Confluent is not accountable for Security-Enhanced Linux (SELinux) policy development, support, or enforcement. If you experience issues running Confluent Platform with SELinux enabled on a supported Linux Operating System, contact your OS provider for assistance.
Windows is not currently supported for Confluent Platform.
- macOS 10.14 and later is supported for testing and development purposes only.
- File descriptors
- For the file descriptor requirement for Kafka, see File Descriptors and mmap.
Control Center requires many open RocksDB files. Set the
ulimitfor the number of open files to a minimum value of 16384 using the
For the other Confluent Platform components, specifically Schema Registry and Replicator, you can leave the
ulimitas the OS default.
- RHEL with TLS
When installing Confluent Platform on RHEL8 with TLS encryption, you must add DH Key Size JVM Parameters for each component. For more information, see Strong crypto defaults in RHEL 8 and deprecation of weak crypto algorithms.
Set the following component-level environment variables to the argument:
- Control Center:
- Schema Registry:
- Kafka, ZooKeeper, and Connect:
- REST Proxy:
- Control Center:
Java 17 is the recommended version in this version of Confluent Platform. Java 11 and Java 8 are also supported.
Java 8 is now deprecated in Confluent Platform, and the support for Java 8 will be removed in Confluent Platform 8.0.
From a security perspective, we recommend the latest released patch version as older freely available versions have disclosed security vulnerabilities.
Use the latest released patch version of Java to ensure known security vulnerabilities are addressed.
Java 9 and 10 are not supported in Confluent Platform as those versions are short-term rapid release versions.
For more information about Java versions, see Java Version History.
You need to separately install the correct version of Java before you start the Confluent Platform installation process.
We recommend using the full JDK to help Confluent Support with troubleshooting and to provide better support when you experience issues with Confluent Platform.
OpenJDK, Zulu OpenJDK, Eclipse Temurin (formerly known as AdoptOpenJDK), and Oracle are supported with Confluent Platform.
If you have multiple JDKs installed, see also Java version requirements for the Confluent CLI.
Control Center relies heavily on Kafka, so a fast and reliable network is important for performance. Modern datacenter networking speed of 1 GbE, 10 GbE should be sufficient.
The table below lists the network services and ports exposed as part of Confluent Platform.
All services listed below use the TCP protocol.
All ports listed below are the default ports, and in most cases you can configure each service to listen on a different port of your choice.
Ports that are indicated to be Internal Only need to be accessible by components within Confluent Platform, not by users or clients of the platform.
When deploying Confluent Platform, ensure that your networking rules allow for the required access to the various components and services.
|Component and Service||Default Port||Internal Only?|
|(Standalone) REST Proxy||8082||No|
|Confluent Control Center||9021||No|
[*] Reserve the Jolokia ports only when you deploy Confluent Platform using Ansible.
Clock synchronization on each Kafka broker is required to ensure the full system functions
correctly. For example, secure network communication with the brokers that rely on
TLS certificate verification may fail if clocks are not synchronized. Clock synchronization
can be achieved using utilities like
ntpd that implement the Network Time Protocol (NTP).