云服务器(阿里云)安装kafka及相关报错处理（WARN Connection request from old client /58.247.201.56:31365； will be dropp）

linux下载：wget http://mirrors.hust.edu.cn/apache/kafka/2.0.0/kafka_2.12-2.0.0.tgz

云服务器安装kafka，部署zookeeper时有如下注意点：

在server.properties配置文件里：

1、在云服务器安全组中开放：2181、9092端口

2、zookeeper.connect改成公网IP

3、listeners=PLAINTEXT:// 必须填内网IP

listeners=PLAINTEXT://**.**.**.**:9092

4、配置外部代理地址必须填公网IP

advertised.listeners=PLAINTEXT://**.**.**.**:9092
advertised.host.name=**.**.**.**

5、host.name填内网IP
host.name=**.**.**.**
port=9092

在zookeeper的zoo.cfg文件里加上：

server.1=**.**.**.**:2888:3888

zookeeper启动之后，再启动kafka

./bin/kafka-server-start.sh config/server.properties

相关报错：

（1）kafka.common.KafkaException: Socket server failed to bind to 10.20.1.154:9092: Cannot assign requested address
该情况下的虚拟机对外ip[暴露的ip]和真实ip[ifconfig显示的ip]可能只是映射关系，用户访问对外ip时，OpenStack会转发到对应的真实ip实现访问。但此时如果 Kafka server.properties配置中的listeners=PLAINTEXT://10.20.1.153:9092中的ip配置为[对外ip]的时候无法启动，因为socket无法绑定监听，报如下错误：kafka.common.KafkaException: Socket server failed to bind to 10.20.1.154:9092: Cannot assign requested address
解决方法：listeners=PLAINTEXT://10.20.1.153:9092中的ip改为真实ip[ifconfig中显示的ip]即可，其他使用时正常使用对外ip即可，跟真实ip就没有关系了。

（2）Native memory allocation (mmap) failed to map 1073741824 bytes for committing reserved memor

错误原因：

Kafka默认使用-Xmx1G -Xms1G的JVM内存配置，如果机器内存较小，需要调整启动配置。

解决办法：

打开/config/kafka-server-start.sh，修改
export KAFKA_HEAP_OPTS="-Xmx1G -Xms1G"
为适合当前服务器的配置，例如export KAFKA_HEAP_OPTS="-Xmx256M -Xms128M"
（3）WARN Connection request from old client /58.247.201.56:31365; will be dropped if server is in r-o mode (org.apache.zookeeper.server.ZooKeeperServer)

报这种警告且外网不能访问kafka，原因就是server.properties文件里内网和外网IP配置不正确。

正确的server.properties配置文件如下：

# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.# see kafka.server.KafkaConfig for additional details and defaults############################# Server Basics ############################## The id of the broker. This must be set to a unique integer for each broker.
broker.id=0############################# Socket Server Settings ############################## The address the socket server listens on. It will get the value returned from
# java.net.InetAddress.getCanonicalHostName() if not configured.
#   FORMAT:
#     listeners = listener_name://host_name:port
#   EXAMPLE:
#     listeners = PLAINTEXT://your.host.name:9092
#listeners=PLAINTEXT://:9092
listeners=PLAINTEXT://172.28.54.75:9092
# Hostname and port the broker will advertise to producers and consumers. If not set,
# it uses the value for "listeners" if configured.  Otherwise, it will use the value
# returned from java.net.InetAddress.getCanonicalHostName().
#advertised.listeners=PLAINTEXT://your.host.name:9092
advertised.listeners=PLAINTEXT://47.124.245.85:9092
advertised.host.name=47.124.245.85
host.name=172.28.54.75
port=9092
# Maps listener names to security protocols, the default is for them to be the same. See the config documentation for more details
#listener.security.protocol.map=PLAINTEXT:PLAINTEXT,SSL:SSL,SASL_PLAINTEXT:SASL_PLAINTEXT,SASL_SSL:SASL_SSL# The number of threads that the server uses for receiving requests from the network and sending responses to the network
num.network.threads=3# The number of threads that the server uses for processing requests, which may include disk I/O
num.io.threads=8# The send buffer (SO_SNDBUF) used by the socket server
socket.send.buffer.bytes=102400# The receive buffer (SO_RCVBUF) used by the socket server
socket.receive.buffer.bytes=102400# The maximum size of a request that the socket server will accept (protection against OOM)
socket.request.max.bytes=104857600############################# Log Basics ############################## A comma separated list of directories under which to store log files
log.dirs=/root/flink/logs# The default number of log partitions per topic. More partitions allow greater
# parallelism for consumption, but this will also result in more files across
# the brokers.
num.partitions=1# The number of threads per data directory to be used for log recovery at startup and flushing at shutdown.
# This value is recommended to be increased for installations with data dirs located in RAID array.
num.recovery.threads.per.data.dir=1############################# Internal Topic Settings  #############################
# The replication factor for the group metadata internal topics "__consumer_offsets" and "__transaction_state"
# For anything other than development testing, a value greater than 1 is recommended to ensure availability such as 3.
offsets.topic.replication.factor=1
transaction.state.log.replication.factor=1
transaction.state.log.min.isr=1############################# Log Flush Policy ############################## Messages are immediately written to the filesystem but by default we only fsync() to sync
# the OS cache lazily. The following configurations control the flush of data to disk.
# There are a few important trade-offs here:
#    1. Durability: Unflushed data may be lost if you are not using replication.
#    2. Latency: Very large flush intervals may lead to latency spikes when the flush does occur as there will be a lot of data to flush.
#    3. Throughput: The flush is generally the most expensive operation, and a small flush interval may lead to excessive seeks.
# The settings below allow one to configure the flush policy to flush data after a period of time or
# every N messages (or both). This can be done globally and overridden on a per-topic basis.# The number of messages to accept before forcing a flush of data to disk
#log.flush.interval.messages=10000# The maximum amount of time a message can sit in a log before we force a flush
#log.flush.interval.ms=1000############################# Log Retention Policy ############################## The following configurations control the disposal of log segments. The policy can
# be set to delete segments after a period of time, or after a given size has accumulated.
# A segment will be deleted whenever *either* of these criteria are met. Deletion always happens
# from the end of the log.# The minimum age of a log file to be eligible for deletion due to age
log.retention.hours=168# A size-based retention policy for logs. Segments are pruned from the log unless the remaining
# segments drop below log.retention.bytes. Functions independently of log.retention.hours.
#log.retention.bytes=1073741824# The maximum size of a log segment file. When this size is reached a new log segment will be created.
log.segment.bytes=1073741824# The interval at which log segments are checked to see if they can be deleted according
# to the retention policies
log.retention.check.interval.ms=300000############################# Zookeeper ############################## Zookeeper connection string (see zookeeper docs for details).
# This is a comma separated host:port pairs, each corresponding to a zk
# server. e.g. "127.0.0.1:3000,127.0.0.1:3001,127.0.0.1:3002".
# You can also append an optional chroot string to the urls to specify the
# root directory for all kafka znodes.
zookeeper.connect=47.124.245.85:2181# Timeout in ms for connecting to zookeeper
zookeeper.connection.timeout.ms=18000############################# Group Coordinator Settings ############################## The following configuration specifies the time, in milliseconds, that the GroupCoordinator will delay the initial consumer rebalance.
# The rebalance will be further delayed by the value of group.initial.rebalance.delay.ms as new members join the group, up to a maximum of max.poll.interval.ms.
# The default value for this is 3 seconds.
# We override this to 0 here as it makes for a better out-of-the-box experience for development and testing.
# However, in production environments the default value of 3 seconds is more suitable as this will help to avoid unnecessary, and potentially expensive, rebalances during application startup.
group.initial.rebalance.delay.ms=0

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