Ubuntu 16.04.1 LTS zookeeper-3.4.11安装启动失败Error contacting service. It is probably not running.

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腾讯云服务器Ubuntu 16.04.1 LTS zookeeper-3.4.11安装启动失败

zookeeper安装后启动报权限不足：

kevin@ubuntu:/opt/zookeeper-3.4.8/bin$ ./zkServer.sh start
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper-3.4.8/bin/../conf/zoo.cfg
Starting zookeeper ... ./zkServer.sh: line 149: /tmp/zookeeper/zookeeper_server.pid: Permission denied
FAILED TO WRITE PID

我们用sudo 启动：

kevin@ubuntu:/opt/zookeeper-3.4.8/bin$ sudo ./zkServer.sh start
[sudo] password for kevin: 
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper-3.4.8/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED

我们看到启动并不报错，但是zookeeper 并没有启动成功，我们看一下zookeeper服务状态：

kevin@ubuntu:/opt/zookeeper-3.4.8/bin$ sudo ./zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper-3.4.8/bin/../conf/zoo.cfg
Error contacting service. It is probably not running.

看了一下zookeeper的启动日志zookeeper.out （在bin目录下）：

nohup: failed to run command ‘java’: No such file or directory 

然后自己又在命行里执行了一下java javac 没有任何问题，但是当我执行sudo java ,sudo javac 的时候就提提示错误sudo: java: command not found

查了一些资料后得知：

sudo是默认是去找系统默认的jdk，而系统默认的jdk路径是/usr/bin/下面

使用sudo update-alternatives --list java查看下：

kevin@ubuntu:/opt/zookeeper-3.4.8/bin$ sudo update-alternatives --list java
update-alternatives: error: no alternatives for java

 这里我们并没有看到 java  的软链接，可能大多数人linux下安装jkd 的方式通常是下载一个jdk的安装包，解压到指定目录下，然后配置一下环境变量在/etc/profile或者.bashrc （这里不再赘余jdk安装）

执行如下：

kevin@ubuntu:/opt/zookeeper-3.4.8/bin$ 
[sudo] password for kevin: sudo update-alternatives --install /usr/bin/java java /opt/java/jdk1.8.0_77/bin/java 300
update-alternatives: using /opt/java/jdk1.8.0_77 to provide /usr/bin/java (java) in auto mode

再来看一下（已经有了）：

kevin@ubuntu:/opt/zookeeper-3.4.8/bin$ update-alternatives --list java
/opt/java/jdk1.8.0_77

此时我们再来sudo 启动一下zookeeper:

kevin@ubuntu:/opt/zookeeper-3.4.8/bin$ sudo ./zkServer.sh start
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper-3.4.8/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED

再检查一下是否启动：

kevin@ubuntu:/opt/zookeeper-3.4.8/bin$ sudo ./zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper-3.4.8/bin/../conf/zoo.cfg
Mode: standalone

再看一下进程：

kevin@ubuntu:/opt/zookeeper-3.4.8/bin$ netstat -an|grep 2181
tcp6       0      0 :::2181                 :::*                    LISTEN  

搞定！！

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