hdfs部署环境准备&hdfs伪劣分布式部署

Hadoop:
广义: 以apache hadoop软件为主的生态圈(hive zookeeper spark hbase)
狭义: apache hadoop软件

hadoop.apache.org
hive.apache.org
spark.apache.org

hadoop软件:
1.x 企业不用
2.x 主流
3.x 没有企业敢用
a.采坑
b.很多公司都是CDH5.x部署大数据环境 (www.cloudera.com)
2.6.0-cdh5.7.0 =? apache hadoop2.6.0

hadoop软件:
hdfs：存储 分布式文件系统
mapreduce：计算 job1 job2 编码 java but 企业不用(开发难度高 代码量大 计算慢)
yarn：资源（CPU memory）和作业调度

上课: 2.6.0-cdh5.7.0
2.6.0-cdh5.14.0

apache hadoop： hadoop.apache.org
cdh hadoop: http://archive.cloudera.com/cdh5/cdh/5/

wget http://archive.cloudera.com/cdh5/cdh/5/hadoop-2.6.0-cdh5.7.0.tar.gz
rz命令上传

学习: 伪分布式 1台服务器就够了

Ubuntu Linux:
$ sudo apt-get install ssh
$ sudo apt-get install rsync

CentOS：
yum

$ sudo yum install ssh
$ sudo yum install rsync

----------------------------

不同的用户管理着不同的软件
linux root用户
mysql mysqladmin用户
hadoop hadoop用户

1.创建用户和上传hadoop软件
useradd hadoop
su - hadoop
[hadoop@hadoop002 ~]$ mkdir app
[hadoop@hadoop002 ~]$ cd app/

[hadoop@hadoop002 ~]$ wget http://archive.cloudera.com/cdh5/cdh/5/hadoop-2.6.0-cdh5.7.0.tar.gz
或
[hadoop@hadoop002 ~]$ rz 上传

2.部署jdk
CDH环境:
mkdir /usr/java jdk部署
mkdir /usr/share/java 部署CDH需要mysql jdbc jar包

rz上传 jdk-8u45-linux-x64.gz

解压
[root@hadoop002 java]# tar -xzvf jdk-8u45-linux-x64.gz
[root@hadoop002 java]# ll
total 319156
drwxr-xr-x 8 uucp 143 4096 Apr 11 2015 jdk1.8.0_45
-rw-r--r-- 1 root root 153530841 Jul 8 2015 jdk-7u80-linux-x64.tar.gz
-rw-r--r-- 1 root root 173271626 Sep 19 11:49 jdk-8u45-linux-x64.gz

权限修正
[root@hadoop002 java]# chown -R root:root jdk1.8.0_45
[root@hadoop002 java]# ll
total 319156
drwxr-xr-x 8 root root 4096 Apr 11 2015 jdk1.8.0_45
-rw-r--r-- 1 root root 153530841 Jul 8 2015 jdk-7u80-linux-x64.tar.gz
-rw-r--r-- 1 root root 173271626 Sep 19 11:49 jdk-8u45-linux-x64.gz
[root@hadoop002 java]# vi /etc/profile

#env
export JAVA_HOME=/usr/java/jdk1.8.0_45
export JRE_HOME=$JAVA_HOME/jre
export CLASSPATH=.:$JAVA_HOME/lib:$JER_HOME/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$JER_HOME/bin:$PATH

[root@hadoop002 java]# source /etc/profile
[root@hadoop002 java]# which java
/usr/java/jdk1.8.0_45/bin/java
[root@hadoop002 java]#
[root@hadoop002 java]#

解释器 /bin/bash
/sbin/nologin

CDH:
组件 用户
hdfs hdfs
yarn yarn
zookeeper zookeeper
hbase hbase

su - zookeeper切不了：This account is currently not available.
生产怎么做：/sbin/nologin --》 /bin/bash

vim /etc/passwd 

把

zookeeperty:x:515:515::/home/zookeeper:/bin/nologin

修改为

zookeeper:x:515:515::/home/zookeeper:/bin/bash

3.解压hadoop
[hadoop@hadoop002 app]$ tar -xzvf hadoop-2.6.0-cdh5.7.0.tar.gz
[hadoop@hadoop002 app]$ cd hadoop-2.6.0-cdh5.7.0
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$ ll
total 76
drwxr-xr-x 2 hadoop hadoop 4096 Mar 24 2016 bin 可执行脚本
drwxr-xr-x 2 hadoop hadoop 4096 Mar 24 2016 bin-mapreduce1
drwxr-xr-x 3 hadoop hadoop 4096 Mar 24 2016 cloudera
drwxr-xr-x 6 hadoop hadoop 4096 Mar 24 2016 etc 配置目录(conf)
drwxr-xr-x 5 hadoop hadoop 4096 Mar 24 2016 examples
drwxr-xr-x 3 hadoop hadoop 4096 Mar 24 2016 examples-mapreduce1
drwxr-xr-x 2 hadoop hadoop 4096 Mar 24 2016 include
drwxr-xr-x 3 hadoop hadoop 4096 Mar 24 2016 lib jar包目录
drwxr-xr-x 2 hadoop hadoop 4096 Mar 24 2016 libexec
drwxr-xr-x 3 hadoop hadoop 4096 Mar 24 2016 sbin hadoop组件的启动 停止脚本
drwxr-xr-x 4 hadoop hadoop 4096 Mar 24 2016 share
drwxr-xr-x 17 hadoop hadoop 4096 Mar 24 2016 src
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$

4.Configuration
Use the following:

etc/hadoop/core-site.xml:

<configuration>
<property>
<name>fs.defaultFS</name>
<value>hdfs://localhost:9000</value>
</property>
</configuration>

etc/hadoop/hdfs-site.xml:
<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
</configuration>

5.配置ssh localhost无密码信任关系
[hadoop@hadoop002 ~]$ ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/home/hadoop/.ssh/id_rsa):
Created directory '/home/hadoop/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/hadoop/.ssh/id_rsa.
Your public key has been saved in /home/hadoop/.ssh/id_rsa.pub.
The key fingerprint is:
ba:48:3d:ff:af:4d:da:74:67:31:d6:98:ad:a0:b3:76 hadoop@hadoop002
The key's randomart image is:
+--[ RSA 2048]----+
| |
| |
| |
| +.|
| S . o+o|
| . . . ...o|
| . + o o o o|
| . . + .OE. o |
| . . .o=++ |
+-----------------+
[hadoop@hadoop002 ~]$ cd .ssh
[hadoop@hadoop002 .ssh]$ ll
total 8
-rw------- 1 hadoop hadoop 1675 Feb 13 22:36 id_rsa 私钥
-rw-r--r-- 1 hadoop hadoop 398 Feb 13 22:36 id_rsa.pub 公钥
[hadoop@hadoop002 .ssh]$ cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
[hadoop@hadoop002 .ssh]$

[hadoop@hadoop002 .ssh]$ ll
total 12
-rw-rw-r-- 1 hadoop hadoop 398 Feb 13 22:37 authorized_keys
-rw------- 1 hadoop hadoop 1675 Feb 13 22:36 id_rsa
-rw-r--r-- 1 hadoop hadoop 398 Feb 13 22:36 id_rsa.pub
-rw-r--r-- 1 hadoop hadoop 0 Feb 13 22:39 known_hosts

ssh localhost date 是需要输入密码，但是这个用户是没有配置密码。
我们应该在没有配置密码情况下去完成无密码信任呢？

改权限

chmod 700 -R ~/.ssh
chmod 600 ~/.ssh/authorized_keys 
[hadoop@hadoop002 .ssh]$ chmod 600 authorized_keys
[hadoop@hadoop002 .ssh]$ ssh localhost date
The authenticity of host 'localhost (127.0.0.1)' can't be established.
RSA key fingerprint is b1:94:33:ec:95:89:bf:06:3b:ef:30:2f:d7:8e:d2:4c.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'localhost' (RSA) to the list of known hosts.
Wed Feb 13 22:41:17 CST 2019
[hadoop@hadoop002 .ssh]$
[hadoop@hadoop002 .ssh]$
[hadoop@hadoop002 .ssh]$ ssh localhost date
####ssh 远程登录到localhost 这台机器去打印一个命令 把这个命令的结果返回回来
Wed Feb 13 22:41:22 CST 2019
[hadoop@hadoop002 .ssh]$

6.格式化
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$ bin/hdfs namenode -format

7.启动
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$ sbin/start-dfs.sh
19/02/13 22:47:42 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable

Starting namenodes on [localhost]
localhost: starting namenode, logging to /home/hadoop/app/hadoop-2.6.0-cdh5.7.0/logs/hadoop-hadoop-namenode-hadoop002.out
localhost: starting datanode, logging to /home/hadoop/app/hadoop-2.6.0-cdh5.7.0/logs/hadoop-hadoop-datanode-hadoop002.out

#注意：此时可能会报错

[hadoop]@hadoop001 hadoop-2.6.0-cdh5.7.0]$ sbin/start-dfs.sh
19/03/23 19:52:08 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Stopping namenodes on [hadoop001]
hadoop001: Error: JAVA_HOME is not set and could not be found.
localhost: Error: JAVA_HOME is not set and could not be found.

解决方法：在/home/hadoop/app/hadoop-2.6.0-cdh5.7.0/etc/hadoop/hadoop-env.sh这个文件里添加java的家目录即可

[hadoop@hadoop001 hadoop]$ vi hadoop-env.sh

export JAVA_HOME=/usr/java/jdk1.8.0_45
export HADOOP_HOME=/home/hadoop/app/hadoop-2.6.0-cdh5.7.0

# 将export JAVA_HOME=${JAVA_HOME}改为
export JAVA_HOME=/usr/java/jdk1.8.0_45

[hadoop@hadoop001 hadoop]$source  hadoop-env.sh  --敲重点   不要忘记source一下

再次启动发现还是报错

Error: Cannot find configuration directory: /etc/hadoop
Error: Cannot find configuration directory: /etc/hadoop

解决方法

还是在 hadoop-env.sh将 HADOOP_CONF_DIR的默认参数改成自己 hadoop-env.sh所在的目录

[xuziyu@hadoop001 hadoop]$ pwd
/home/xuziyu/app/hadoop-2.6.0-cdh5.7.0/etc/hadoop  --hadoop-env.sh所在的目录

[hadoop@hadoop001 hadoop]$ vi hadoop-env.sh

export HADOOP_CONF_DIR=/home/xuziyu/app/hadoop-2.6.0-cdh5.7.0/etc/hadoop

[hadoop@hadoop001 hadoop]$source  hadoop-env.sh  --敲重点   不要忘记source一下

##错误解除

ssh 信任关系 是配置localhost
为什么要配置ssh
因为hadoop软件脚本在启动的时候是要用到的在远程启动的时候

Starting secondary namenodes [0.0.0.0]
The authenticity of host '0.0.0.0 (0.0.0.0)' can't be established.
RSA key fingerprint is b1:94:33:ec:95:89:bf:06:3b:ef:30:2f:d7:8e:d2:4c.
Are you sure you want to continue connecting (yes/no)? yes ##这里输yes的原因是know_hosts文件中是没有0.0.0.0这条地址信息的 输入yes以后为什么不用输入密码就可以进入，是因为我们的公钥文件（即id_rsa.pub）
放到了一个叫信任的文件里边authorized_keys,相当于暴露出去了，不需要输入
0.0.0.0: Warning: Permanently added '0.0.0.0' (RSA) to the list of known hosts.
0.0.0.0: starting secondarynamenode, logging to /home/hadoop/app/hadoop-2.6.0-cdh5.7.0/logs/hadoop-hadoop-secondarynamenode-hadoop002.out
19/02/13 22:49:47 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$

ssh localhost date
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$ sbin/stop-dfs.sh
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$ sbin/start-dfs.sh
19/02/13 22:57:23 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Starting namenodes on [localhost]
localhost: starting namenode, logging to /home/hadoop/app/hadoop-2.6.0-cdh5.7.0/logs/hadoop-hadoop-namenode-hadoop002.out
localhost: starting datanode, logging to /home/hadoop/app/hadoop-2.6.0-cdh5.7.0/logs/hadoop-hadoop-datanode-hadoop002.out
Starting secondary namenodes [0.0.0.0]
0.0.0.0: starting secondarynamenode, logging to /home/hadoop/app/hadoop-2.6.0-cdh5.7.0/logs/hadoop-hadoop-secondarynamenode-hadoop002.out
19/02/13 22:57:38 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$ jps
15059 Jps
14948 SecondaryNameNode 第二名称节点 老二
14783 DataNode 数据节点 小弟
14655 NameNode 名称节点 老大 读写
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$
###如果启动以后jps查看发现DataNode没有启动起来，就需要重新打开一个窗口
用root用户登录，到tmp目录下删掉hadoop-hadoop，或者将tmp目录下的文件清空（全部删除）
[root@hadoop001 tmp]# ll
total 28
srwxr-xr-x 1 root root 0 Jan 25 00:40 Aegis-<Guid(5A2C30A2-A87D-490A-9281-6765EDAD7CBA)>
drwxrwxr-x 3 hadoop hadoop 4096 Feb 17 12:00 hadoop-hadoop
drwxr-xr-x 2 hadoop hadoop 4096 Feb 17 14:46 hsperfdata_hadoop
drwxrwxr-x 4 hadoop hadoop 4096 Feb 17 12:21 Jetty_0_0_0_0_50070_hdfs____w2cu08
drwxrwxr-x 4 hadoop hadoop 4096 Feb 17 12:21 Jetty_0_0_0_0_50090_secondary____y6aanv
drwxrwxr-x 4 hadoop hadoop 4096 Feb 17 12:21 Jetty_localhost_43515_datanode____8tekv5
drwx------ 3 root root 4096 Dec 19 10:45 systemd-private-eb1b20a234e9490a9501420766a0ad26-httpd.service-1R84I0
drwx------ 3 root root 4096 Nov 21 14:11 systemd-private-eb1b20a234e9490a9501420766a0ad26-ntpd.service-ALvtHb
[root@hadoop001 tmp]#
然后再重新格式化
.格式化
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$ bin/hdfs namenode -format
然后再重新启动
.启动
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$ sbin/start-dfs.sh
这时候在用jps查看进程（这个方法适用于安装过一次 第二次安装，属于环境残留造成的）
[hadoop@hadoop001 hadoop-2.6.0-cdh5.7.0]$ jps
24032 NameNode
24424 Jps
24154 DataNode
24315 SecondaryNameNode
[hadoop@hadoop001 hadoop-2.6.0-cdh5.7.0]$

open http://ip:50070

8.环境变量
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$ cat ~/.bash_profile
# .bash_profile

# Get the aliases and functions
if [ -f ~/.bashrc ]; then
. ~/.bashrc
fi

# User specific environment and startup programs
export HADOOP_PREFIX=/home/hadoop/app/hadoop-2.6.0-cdh5.7.0
export PATH=$HADOOP_PREFIX/bin:$PATH
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$

9.命令: hdfs dfs操作命令和Linux命令极其相似

[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$ bin/hdfs dfs -ls /
19/02/13 23:08:35 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$ bin/hdfs dfs -ls /
19/02/13 23:11:22 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$ ls /
bin dev home lib64 media opt root sbin srv tmp var
boot etc lib lost+found mnt proc run selinux sys usr
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$ bin/hdfs dfs -mkdir /ruozedata
19/02/13 23:11:51 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$ bin/hdfs dfs -ls /
19/02/13 23:11:56 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Found 1 items
drwxr-xr-x - hadoop supergroup 0 2019-02-13 23:11 /ruozedata
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$ ls /
bin dev home lib64 media opt root sbin srv tmp var
boot etc lib lost+found mnt proc run selinux sys usr
[hadoop@hadoop002 hadoop-2.6.0-cdh5.7.0]$

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