Hadoop集群模式安装出现的若干问题
一、域名解析问题
域名解析暂时失败问题
vim /etc/sysconfig/network
查看主机名
vim etc/hosts
配置IP地址与主机名 192.168.60.132 centos #改正就OK啦
二、启动问题
Starting namenodes on [localhost]
ERROR: Attempting to operate on hdfs namenode as root
ERROR: but there is no HDFS_NAMENODE_USER defined. Aborting operation.
Starting datanodes
ERROR: Attempting to operate on hdfs datanode as root
ERROR: but there is no HDFS_DATANODE_USER defined. Aborting operation.
Starting secondary namenodes [bogon]
ERROR: Attempting to operate on hdfs secondarynamenode as root
ERROR: but there is no HDFS_SECONDARYNAMENODE_USER defined. Aborting operation.
处理1 $ vim sbin/start-dfs.sh
$ vim sbin/stop-dfs.sh
两处增加以下内容
HDFS_DATANODE_USER=root
HDFS_DATANODE_SECURE_USER=hdfs
HDFS_NAMENODE_USER=root
HDFS_SECONDARYNAMENODE_USER=root
处理2
$ vim sbin/start-yarn.sh
$ vim sbin/stop-yarn.sh
两处增加以下内容
YARN_RESOURCEMANAGER_USER=root
HADOOP_SECURE_DN_USER=yarn
YARN_NODEMANAGER_USER=root
三、端口问题
localhost: ssh: connect to host localhost port 22: Cannot assign requested address
cd /etc/ssh
vim sshd_config
添加 Port 22
四、Failed to get D-Bus connection: Operation not permitted
解决方法:docker run --privileged -ti -e "container=docker" -v /sys/fs/cgroup:/sys/fs/cgroup hadoop-master /usr/sbin/init
五、服务报错
sshd re-exec requires execution with an absolute path
在开启SSHD服务时报错.
sshd re-exec requires execution with an absolute path
用绝对路径启动,也报错如下:
Could not load host key: /etc/ssh/ssh_host_key
Could not load host key: /etc/ssh/ssh_host_rsa_key
Could not load host key: /etc/ssh/ssh_host_dsa_key
Disabling protocol version 1. Could not load host key
Disabling protocol version 2. Could not load host key
sshd: no hostkeys available — exiting
解决过程:
#ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key
#ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key
#/usr/sbin/sshd
执行后报错:
Could not load host key: /etc/ssh/ssh_host_ecdsa_key
Could not load host key: /etc/ssh/ssh_host_ed25519_key
解决过程:
#ssh-keygen -t dsa -f /etc/ssh/ssh_host_ecdsa_key
#ssh-keygen -t rsa -f /etc/ssh/ssh_host_ed25519_key
#/usr/sbin/sshd
六、报错如下
WARNING: HADOOP_SECURE_DN_USER has been replaced by HDFS_DATANODE_SECURE_USER. Using value of HADOOP_SECURE_DN_USER.
Starting namenodes on [master]
master: /usr/hadoop/hadoop-3.2.0/libexec/hadoop-functions.sh: line 982: ssh: command not found
Starting datanodes
Last login: Mon Jan 28 08:32:32 UTC 2019 on pts/0
localhost: /usr/hadoop/hadoop-3.2.0/libexec/hadoop-functions.sh: line 982: ssh: command not found
Starting secondary namenodes [b982e2adc393]
Last login: Mon Jan 28 08:32:33 UTC 2019 on pts/0
b982e2adc393: /usr/hadoop/hadoop-3.2.0/libexec/hadoop-functions.sh: line 982: ssh: command not found
Starting resourcemanager
Last login: Mon Jan 28 08:32:35 UTC 2019 on pts/0
Starting nodemanagers
Last login: Mon Jan 28 08:32:42 UTC 2019 on pts/0
localhost: /usr/hadoop/hadoop-3.2.0/libexec/hadoop-functions.sh: line 982: ssh: command not foun
解决:
在
$ vim sbin/start-dfs.sh
$ vim sbin/stop-dfs.sh
将HADOOP_SECURE_DN_USER=hdfs替换为HADOOP_DATANODE_SECURE_DN_USER=hdfs
centos默认安装有ssh服务,没有客户端。
查看ssh安装
# rpm -qa | grep openssh
openssh-5.3p1-123.el6_9.x86_64
openssh-server-5.3p1-123.el6_9.x86_64
没有安装openssh-clients
yum安装ssh客户端
yum -y install openssh-clients
七、docker: Error response from daemon: cgroups: cannot find cgroup mount destination: unknown.
没有找到具体的解决方法,重启后可以访问。
八、permission denied (publickey,gssapi-keyex,gssapi-with-mic,password)
vim /etc/ssh/sshd_config
# $OpenBSD: sshd_config,v 1.80 2008/07/02 02:24:18 djm Exp $ # This is the sshd server system-wide configuration file. See
# sshd_config(5) for more information. # This sshd was compiled with PATH=/usr/local/bin:/bin:/usr/bin # The strategy used for options in the default sshd_config shipped with
# OpenSSH is to specify options with their default value where
# possible, but leave them commented. Uncommented options change a
# default value. #Port 22
#AddressFamily any
#ListenAddress 0.0.0.0
#ListenAddress :: # Disable legacy (protocol version 1) support in the server for new
# installations. In future the default will change to require explicit
# activation of protocol 1
Protocol 2 # HostKey for protocol version 1
-----------
就是改一下信息
RSAAuthentication yes
PubkeyAuthentication yes
PasswordAuthentication no
改完后一定要重启ssh服务 service sshd restart
systemctl restart sshd.service
九、WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
系统预装的glibc库是2.12版本,而hadoop期望是2.14版本,所以打印警告信息。
现在有两个办法,重新编译glibc.2.14版本,安装后专门给hadoop使用,这个有点危险。
第二个办法直接在log4j日志中去除告警信息。在//usr/local/hadoop-2.5.2/etc/hadoop/log4j.properties文件中添加
log4j.logger.org.apache.hadoop.util.NativeCodeLoader=ERROR
十、MapReduce操作出现错误: 找不到或无法加载主类org.apache.hadoop.mapreduce.v2.app.MRAppMaster 问题解决方法
在命令行下输入 Hadoop classpath
编辑yarn-site.xml
添加一下内容
<configuration>
<property>
<name>yarn.application.classpath</name>
<value>输入刚才返回的Hadoop classpath路径</value>
</property>
</configuration>
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