centos7虚拟机配置

##修改虚拟机启动模式为命令行方式https://blog.youkuaiyun.com/teisite/article/details/81196067

systemctl set-default multi-user.target

##关闭防火墙https://blog.youkuaiyun.com/shubingzhuoxue/article/details/84578749

systemctl status firewalld.service

systemctl stop firewalld.service

systemctl disable firewalld.service

##设置系统时间同步https://blog.youkuaiyun.com/qq_39314099/article/details/100575935

yum install -y ntpdate

rm -rf /etc/localtime

cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

ntpdate -u ntp.api.bz

hwclock -w

##设置sudoershttps://blog.youkuaiyun.com/danykk/article/details/80137806

chmod u+w /etc/sudoers

vim /etc/sudoers

##内容增加如下

## Allow root to run any commands anywhere

root ALL=(ALL) ALL

hadoop ALL=(ALL) ALL

##删除自带的openJDK

rpm -qa | grep java

##展示如下

javapackages-tools-3.4.1-11.el7.noarch

java-1.8.0-openjdk-headless-1.8.0.262.b10-1.el7.x86_64

tzdata-java-2020a-1.el7.noarch

java-1.7.0-openjdk-headless-1.7.0.261-2.6.22.2.el7_8.x86_64

java-1.8.0-openjdk-1.8.0.262.b10-1.el7.x86_64

python-javapackages-3.4.1-11.el7.noarch

java-1.7.0-openjdk-1.7.0.261-2.6.22.2.el7_8.x86_64

##删除openJDK

rpm -e --nodeps javapackages-tools-3.4.1-11.el7.noarch

rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.262.b10-1.el7.x86_64

rpm -e --nodeps tzdata-java-2020a-1.el7.noarch

rpm -e --nodeps java-1.7.0-openjdk-headless-1.7.0.261-2.6.22.2.el7_8.x86_64

rpm -e --nodeps java-1.8.0-openjdk-1.8.0.262.b10-1.el7.x86_64

rpm -e --nodeps python-javapackages-3.4.1-11.el7.noarch

rpm -e --nodeps java-1.7.0-openjdk-1.7.0.261-2.6.22.2.el7_8.x86_64

##修改虚拟机ip

vim /etc/sysconfig/network-scripts/ifcfg-ens33

##修改如下

TYPE="Ethernet"

PROXY_METHOD="none"

BROWSER_ONLY="no"

BOOTPROTO="static"

DEFROUTE="yes"

IPV4_FAILURE_FATAL="no"

IPV6INIT="yes"

IPV6_AUTOCONF="yes"

IPV6_DEFROUTE="yes"

IPV6_FAILURE_FATAL="no"

IPV6_ADDR_GEN_MODE="stable-privacy"

NAME="ens33"

UUID="6d9e7fb4-639b-44c5-a4c6-90bcbfeeda1d"

DEVICE="ens33"

ONBOOT="yes"

IPADDR=192.168.64.101

GATEWAY=192.168.64.1

NETMASK=255.255.255.0

DNS1=192.168.64.1

DNS2=8.8.8.8

##重新启动网络服务

service network restart

##修改hostname

vim /etc/hostname

##修改hosts

vim /etc/hosts

##hosts内容如下

127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4

::1 localhost localhost.localdomain localhost6 localhost6.localdomain6

192.168.64.101 hadoop101

192.168.64.102 hadoop102

192.168.64.103 hadoop103

192.168.64.104 hadoop104

192.168.64.105 hadoop105

192.168.64.106 hadoop106

192.168.64.107 hadoop107

##最后重启

reboot