设置单个 Zookeeper 实例并且绑定失败

Question

我正在尝试使用以下配置设置单个 zookeeper 实例，但是启动日志表明 zookeeper 在尝试绑定端口 2181 时正在停止。请有人在这里告诉我这个问题。谢谢。

启动日志；

    2014-07-18 16:00:48,976 [myid:] - INFO  [main:QuorumPeerConfig@103] - Reading configuration from: /opt/zookeeper/bin/../conf/zoo.cfg
2014-07-18 16:00:48,980 [myid:] - ERROR [main:QuorumPeerConfig@289] - Invalid configuration, only one server specified (ignoring)
2014-07-18 16:00:48,982 [myid:] - INFO  [main:DatadirCleanupManager@78] - autopurge.snapRetainCount set to 3
2014-07-18 16:00:48,982 [myid:] - INFO  [main:DatadirCleanupManager@79] - autopurge.purgeInterval set to 0
2014-07-18 16:00:48,983 [myid:] - INFO  [main:DatadirCleanupManager@101] - Purge task is not scheduled.
2014-07-18 16:00:48,983 [myid:] - WARN  [main:QuorumPeerMain@113] - Either no config or no quorum defined in config, running  in standalone mode
2014-07-18 16:00:48,997 [myid:] - INFO  [main:QuorumPeerConfig@103] - Reading configuration from: /opt/zookeeper/bin/../conf/zoo.cfg
2014-07-18 16:00:48,998 [myid:] - **ERROR** [main:QuorumPeerConfig@289] - Invalid configuration, only one server specified (ignoring)
2014-07-18 16:00:48,998 [myid:] - INFO  [main:ZooKeeperServerMain@95] - Starting server
2014-07-18 16:00:49,007 [myid:] - INFO  [main:Environment@100] - Server environment:zookeeper.version=3.4.6-1569965, built on 02/20/2014 09:09 GMT
2014-07-18 16:00:49,007 [myid:] - INFO  [main:Environment@100] - Server environment:host.name=<NA>
2014-07-18 16:00:49,007 [myid:] - INFO  [main:Environment@100] - Server environment:java.version=1.7.0_51
2014-07-18 16:00:49,007 [myid:] - INFO  [main:Environment@100] - Server environment:java.vendor=Oracle Corporation
2014-07-18 16:00:49,007 [myid:] - INFO  [main:Environment@100] - Server environment:java.home=/usr/java/jdk1.7.0_51/jre
2014-07-18 16:00:49,007 [myid:] - INFO  [main:Environment@100] - Server environment:java.class.path=/opt/zookeeper/bin/../build/classes:/opt/zookeeper/bin/../build/lib/*.jar:/opt/zookeeper/bin/../lib/slf4j-log4j12-1.6.1.jar:/opt/zookeeper/bin/../lib/slf4j-api-1.6.1.jar:/opt/zookeeper/bin/../lib/netty-3.7.0.Final.jar:/opt/zookeeper/bin/../lib/log4j-1.2.16.jar:/opt/zookeeper/bin/../lib/jline-0.9.94.jar:/opt/zookeeper/bin/../zookeeper-3.4.6.jar:/opt/zookeeper/bin/../src/java/lib/*.jar:/opt/zookeeper/bin/../conf:
2014-07-18 16:00:49,008 [myid:] - INFO  [main:Environment@100] - Server environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
2014-07-18 16:00:49,010 [myid:] - INFO  [main:Environment@100] - Server environment:java.io.tmpdir=/tmp
2014-07-18 16:00:49,010 [myid:] - INFO  [main:Environment@100] - Server environment:java.compiler=<NA>
2014-07-18 16:00:49,010 [myid:] - INFO  [main:Environment@100] - Server environment:os.name=Linux
2014-07-18 16:00:49,010 [myid:] - INFO  [main:Environment@100] - Server environment:os.arch=amd64
2014-07-18 16:00:49,011 [myid:] - INFO  [main:Environment@100] - Server environment:os.version=3.10.0-123.4.2.el7.x86_64
2014-07-18 16:00:49,011 [myid:] - INFO  [main:Environment@100] - Server environment:user.name=root
2014-07-18 16:00:49,011 [myid:] - INFO  [main:Environment@100] - Server environment:user.home=/root
2014-07-18 16:00:49,011 [myid:] - INFO  [main:Environment@100] - Server environment:user.dir=/opt/zookeeper/bin
2014-07-18 16:00:49,018 [myid:] - INFO  [main:ZooKeeperServer@755] - tickTime set to 2000
2014-07-18 16:00:49,018 [myid:] - INFO  [main:ZooKeeperServer@764] - minSessionTimeout set to -1
2014-07-18 16:00:49,018 [myid:] - INFO  [main:ZooKeeperServer@773] - maxSessionTimeout set to -1
2014-07-18 16:00:49,029 [myid:] - INFO  [main:NIOServerCnxnFactory@94] - binding to port 0.0.0.0/0.0.0.0:2181

Zookeeper 配置文件。

    # The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just
# example sakes.
dataDir=/opt/zookeeper/data
# the port at which the clients will connect
clientPort=2181
#log directory.
dataLogDir=/opt/zookeeper/log

server.1=localhost:2888:3888

# the maximum number of client connections.
# increase this if you need to handle more clients
#maxClientCnxns=60
#
# Be sure to read the maintenance section of the
# administrator guide before turning on autopurge.
#
# http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance
#
# The number of snapshots to retain in dataDir
#autopurge.snapRetainCount=3
# Purge task interval in hours
# Set to "0" to disable auto purge feature
#autopurge.purgeInterval=1

Answer 1

如果您正在为测试/开发运行独立的 Zookeeper，请在 zoo.cfg 中评论此行：#server.1=localhost:2888:3888

然后，而不是：

错误 [main:QuorumPeerConfig@289] - 无效配置，仅指定了一台服务器（忽略）

你会看到：

WARN [main:QuorumPeerMain@125] - 没有配置或没有仲裁 在配置中定义，以独立模式运行

Reference:

server.1=zoo1:2888:3888
server.2=zoo2:2888:3888
server.3=zoo3:2888:3888

表单 server.X 的条目列出了组成 动物园管理员服务。当服务器启动时，它知道它是哪个服务器 是通过在数据目录中查找文件myid。该文件有 包含服务器编号，以 ASCII 格式。

最后，请注意每个服务器名称后面的两个端口号：“2888”和 “3888”。对等点使用前一个端口连接到其他对等点。这样一个 连接是必要的，以便对等方可以通信，例如， 同意更新的顺序。更具体地说，一个 ZooKeeper 服务器 使用此端口将追随者连接到领导者。当一个新的领导 出现时，跟随者使用此命令打开到领导者的 TCP 连接 港口。因为默认的leader选举也使用TCP，我们目前 需要另一个端口进行领导者选举。这是第二个端口 服务器条目。

Answer 2

在 CentOS 上，您可以编辑以下文件并添加 _JAVA_OPTIONS 行

sudo vim /etc/default/zookeeper

export _JAVA_OPTIONS="-Djava.net.preferIPv4Stack=true"

然后重启进程

sudo service zookeeper-server restart

Answer 3

尝试将此添加到 zoo.cfg quorumListenOnAllIPs=true

Answer 4

您是否在 Windows 64 位上运行 zookeeper。我遇到了同样的问题，但后来发现不支持 Win64。查看 Zookeeper 链接http://zookeeper.apache.org/doc/r3.4.5/zookeeperAdmin.html#sc_supportedPlatforms

Answer 5

我建议您从配置文件中删除以下行

server.1=localhost:2888:3888

然后重启服务器。

Answer 6

我要提一下，当您收到以下日志消息时，这意味着服务器实际上已启动。

INFO  [main:NIOServerCnxnFactory@94] - binding to port 0.0.0.0/0.0.0.0:2181

如果您有一个如下的 Zookeeper 实例，您看到的错误消息实际上是警告而不是错误。

2014-07-18 16:00:48,980 [myid:] - ERROR [main:QuorumPeerConfig@289] - Invalid configuration, only one server specified (ignoring)