CentOS7查看和关闭防火墙

我会带着你远行 2022-04-14 02:24 150阅读 0赞

### CentOS 7.0默认使用的是firewall作为防火墙 ###

查看防火墙状态

firewall-cmd --state

停止firewall

systemctl stop firewalld.service

禁止firewall开机启动

systemctl disable firewalld.service

### 关闭selinux ###

进入到/etc/selinux/config文件

vi /etc/selinux/config

将SELINUX=enforcing改为SELINUX=disabled

配制免密登录的命令

ssh-keygen -t rsa 
    ssh-copy-id root@master

scp -P 22 /Users/che/Downloads/jdk-8u161-linux-x64.rpm [root@192.168.1.100][root_192.168.1.100]:/software/

安装: yum install -y jdk-8u161-linux-x64.rpm
     设置环境变量
     cd /usr/java/
    
     /usr/java/jdk1.8.0_161
    
     vi /etc/profile
    
     export JAVA_HOME=/usr/java/jdk1.8.0_161
     export PATH=$JAVA_HOME/bin:$PATH

### 安装hadoop ###

下载安装包  
hadoop-26.5.tar.gz

cd /usr/
    mv /software/hadoop-2.6.5.tar.gz  ./
    解压
    tar -xzvf ./hadoop-2.6.5.tar.gz
    
    创建目录
       namenode目录：/data/hadoop/namenode
       data目录：    /data/hadoop/data
       tmp目录：     /data/hadoop/tmp
       mkdir -p /data/hadoop/namenode
    
    配制
       core-site.xml
       hdfs-site.xml
       mapred-site.xml.template   mapred-site.xml
       cp mapred-site.xml.template   mapred-site.xml
       yarn-site.xml 
    
       slaves   (slave1,slave2)
       masters  (master)
    
       hadoop-env.sh
       export JAVA_HOME=/usr/java/jdk1.8.0_161
    
       将master的配制copy到slave1、slave2
       scp -r ./* root@slave1:/software/hadoop-2.6.5/etc/hadoop/
    
     格式化
       cd hadoop-2.6.5/bin
       ./hdfs namenode -format
    
     启动
       cd ../sbin/
    
       ./start-dfs.sh
    
       ssh-copy-id root@master 
    
       jps(检查一下)
    
       ./start-yarn.sh
    
       cd ../bin
    
       hadoop fs -ls /
       hadoop fs -mkdir /user
    
       /software/hadoop-2.6.5/bin
    
       vi/etc/profile
    
       export HADOOP_HOME=/software/hadoop-2.6.5
       export PATH=$JAVA_HOME/bin:$HADOOP_HOME/bin:$PATH
    
       source /etc/profile
    
       hadoop fs -put /software/hadoop-2.6.5.tar.gz /user
    
       测试2：
       cd share/hadoop/mapreduce
       hadoop jar ./hadoop-mapreduce-examples-2.6.5.jar pi 5 10
    
       192.168.1.100:50070
       192.168.1.100:8088
    
       修改ssh端口
       vim /etc/ssh/sshd_config

### 设置ntp时间同步服务 ###

1、安装ntp

yum install -y ntp

2、设置NTP服务开机启动

chkconfig ntpd on 
    service nptd start

[root_192.168.1.100]: mailto:root@192.168.1.100