Hadoop
Hadoop集群管理
集群架构图例
graph TB
M1([hadoop1<br><font color=0000ff>Namenode<br>SecondaryNamenode<br>ResourceManager</font>])
N1(node-0001<br><font color=0000ff>DataNode<br>NodeManager</font>)
N2(node-0002<br><font color=0000ff>DataNode<br>NodeManager</font>)
N3(node-0003<br><font color=0000ff>DataNode<br>NodeManager</font>)
M1 --> N1 & N2 & N3
重新初始化集群
警告：<font color=ff0000>该方法会丢失所有数据</font>
1、停止集群 /usr/local/hadoop/sbin/stop-all.sh
2、删除所有节点的 /var/hadoop/*
3、在 hadoop1 上重新格式化 /usr/local/hadoop/bin/hdfs namenode -format
4、启动集群 /usr/local/hadoop/sbin/start-all.sh
[root@hadoop1 ~]# /usr/local/hadoop/sbin/stop-all.sh
[root@hadoop1 ~]# for i in hadoop1 node-{0001..0003};do
ssh ${i} 'rm -rf /var/hadoop/*'
done
[root@hadoop1 ~]# /usr/local/hadoop/bin/hdfs namenode -format
[root@hadoop1 ~]# /usr/local/hadoop/sbin/start-all.sh
增加新的节点
购买云主机
| 主机 | IP地址 | 配置 |
|---|---|---|
| newnode | 192.168.1.54 | 最低配置2核2G |
新节点安装
在 hadoop1 上执行
[root@hadoop1 ~]# ssh-copy-id -i /root/.ssh/id_rsa.pub 192.168.1.54
[root@hadoop1 ~]# vim /etc/hosts
192.168.1.50 hadoop1
192.168.1.51 node-0001
192.168.1.52 node-0002
192.168.1.53 node-0003
192.168.1.54 newnode
[root@hadoop1 ~]# for i in node-{0001..0003} newnode;do
rsync -av /etc/hosts ${i}:/etc/
done
[root@hadoop1 ~]# rsync -aXSH /usr/local/hadoop newnode:/usr/local/
在 newnode 节点执行
[root@newnode ~]# yum install -y java-1.8.0-openjdk-devel
[root@newnode ~]# /usr/local/hadoop/sbin/hadoop-daemon.sh start datanode
[root@newnode ~]# /usr/local/hadoop/bin/hdfs dfsadmin -setBalancerBandwidth 500000000
[root@newnode ~]# /usr/local/hadoop/sbin/start-balancer.sh
[root@newnode ~]# /usr/local/hadoop/sbin/yarn-daemon.sh start nodemanager
[root@newnode ~]# jps
1186 DataNode
1431 NodeManager
1535 Jps
验证集群(hadoop1上执行)
[root@hadoop1 ~]# /usr/local/hadoop/bin/hdfs dfsadmin -report
... ...
-------------------------------------------------
Live datanodes (4):
[root@hadoop1 ~]# /usr/local/hadoop/bin/yarn node -list
... ...
Total Nodes:4
删除节点
配置数据迁移 hdfs-site.xml（hadoop1上做，不需要同步）
[root@hadoop1 ~]# vim /usr/local/hadoop/etc/hadoop/hdfs-site.xml
<property>
<name>dfs.hosts.exclude</name>
<value>/usr/local/hadoop/etc/hadoop/exclude</value>
</property>
配置排除主机列表，并迁移数据(hadoop1上执行)
# 在删除配置文件中添加 newnode
[root@hadoop1 ~]# echo newnode >/usr/local/hadoop/etc/hadoop/exclude
# 迁移数据
[root@hadoop1 ~]# /usr/local/hadoop/bin/hdfs dfsadmin -refreshNodes
# 查看状态，仅当节点状态为 Decommissioned 时候才可以下线
[root@hadoop1 ~]# /usr/local/hadoop/bin/hdfs dfsadmin -report
下线节点（newnode执行）
[root@newnode ~]# /usr/local/hadoop/sbin/hadoop-daemon.sh stop datanode
[root@newnode ~]# /usr/local/hadoop/sbin/yarn-daemon.sh stop nodemanager
NFS网关
NFS网关架构图
graph LR
subgraph HDFS集群
N1[(namenode)] === D1[(datanode)] & D2[(datanode)] & D3[(datanode)]
end
subgraph NFS网关
S2{NFS服务} o--o S1{HDFS客户端} --> N1
end
S1 -.-> D1 & D2 & D3
C((客户端)) o--o |mount| S2
classDef HDFS color:#9f0000,fill:#aaccff
class HDFS集群 HDFS
classDef GW color:#9f0000,fill:#22ff66
class NFS网关 GW
classDef C fill:#f9f,stroke:#333,stroke-width:4px;
class C C
购买云主机
| 主机 | IP地址 | 配置 |
|---|---|---|
| nfsgw | 192.168.1.55 | 最低配置1核1G |
HDFS用户授权
hadoop1与nfsgw都要添加用户
[root@hadoop1 ~]# groupadd -g 800 nfsuser
[root@hadoop1 ~]# useradd -g 800 -u 800 -r -d /var/hadoop nfsuser
#----------------------------------------------------------------------------------------
[root@nfsgw ~]# groupadd -g 800 nfsuser
[root@nfsgw ~]# useradd -g 800 -u 800 -r -d /var/hadoop nfsuser
HDFS集群授权
[root@hadoop1 ~]# vim /usr/local/hadoop/etc/hadoop/core-site.xml
<configuration>
<property>
<name>fs.defaultFS</name>
<value>hdfs://hadoop1:9000</value>
</property>
<property>
<name>hadoop.tmp.dir</name>
<value>/var/hadoop</value>
</property>
<property>
<name>hadoop.proxyuser.nfsuser.groups</name>
<value>*</value>
</property>
<property>
<name>hadoop.proxyuser.nfsuser.hosts</name>
<value>*</value>
</property>
</configuration>
[root@hadoop1 ~]# /usr/local/hadoop/sbin/stop-all.sh
[root@hadoop1 ~]# for i in node-{0001..0003};do
rsync -avXSH /usr/local/hadoop/etc ${i}:/usr/local/hadoop/
done
[root@hadoop1 ~]# /usr/local/hadoop/sbin/start-dfs.sh
[root@hadoop1 ~]# jps
5925 NameNode
6122 SecondaryNameNode
6237 Jps
[root@hadoop1 ~]# /usr/local/hadoop/bin/hdfs dfsadmin -report
... ...
-------------------------------------------------
Live datanodes (3):
NFS网关服务
[root@nfsgw ~]# yum remove -y rpcbind nfs-utils
[root@nfsgw ~]# vim /etc/hosts
192.168.1.50 hadoop1
192.168.1.51 node-0001
192.168.1.52 node-0002
192.168.1.53 node-0003
192.168.1.55 nfsgw
[root@nfsgw ~]# yum install -y java-1.8.0-openjdk-devel
[root@nfsgw ~]# rsync -aXSH --delete hadoop1:/usr/local/hadoop /usr/local/
[root@nfsgw ~]# vim /usr/local/hadoop/etc/hadoop/hdfs-site.xml
<configuration>
<property>
<name>dfs.namenode.http-address</name>
<value>hadoop1:50070</value>
</property>
<property>
<name>dfs.namenode.secondary.http-address</name>
<value>hadoop1:50090</value>
</property>
<property>
<name>dfs.replication</name>
<value>2</value>
</property>
<property>
<name>dfs.hosts.exclude</name>
<value>/usr/local/hadoop/etc/hadoop/exclude</value>
</property>
<property>
<name>nfs.exports.allowed.hosts</name>
<value>* rw</value>
</property>
<property>
<name>nfs.dump.dir</name>
<value>/var/nfstmp</value>
</property>
</configuration>
[root@nfsgw ~]# mkdir /var/nfstmp
[root@nfsgw ~]# chown nfsuser.nfsuser /var/nfstmp
[root@nfsgw ~]# rm -rf /usr/local/hadoop/logs/*
[root@nfsgw ~]# setfacl -m user:nfsuser:rwx /usr/local/hadoop/logs
[root@nfsgw ~]# getfacl /usr/local/hadoop/logs
[root@nfsgw ~]# cd /usr/local/hadoop/
[root@nfsgw hadoop]# ./sbin/hadoop-daemon.sh --script ./bin/hdfs start portmap
[root@nfsgw hadoop]# jps
1376 Portmap
1416 Jps
[root@nfsgw hadoop]# rm -rf /tmp/.hdfs-nfs
[root@nfsgw hadoop]# sudo -u nfsuser ./sbin/hadoop-daemon.sh --script ./bin/hdfs start nfs3
[root@nfsgw hadoop]# sudo -u nfsuser jps
1452 Nfs3
1502 Jps
mount验证
[root@newnode ~]# yum install -y nfs-utils
[root@newnode ~]# showmount -e 192.168.1.55
Export list for 192.168.1.55:
/ *
[root@newnode ~]# mount -t nfs -o vers=3,proto=tcp,nolock,noacl,noatime,sync 192.168.1.55:/ /mnt/
[root@newnode ~]# df -h
Filesystem Size Used Avail Use% Mounted on
192.168.1.55:/ 118G 15G 104G 13% /mnt
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