Centos7 安装 JDK8 + Cassandra 数据库

安装 Cassandra 数据库，要先安装 JDK

安装 JDK8

https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

// 解压
tar -zxvf jdk-8u221-linux-x64.tar.gz
cd jdk1.8.0_221

这里我们使用 alternatives 来安装，如果原来装了老版本的，就会进行替换
/opt/jdk1.8.0_221 是我的文件解压目录

alternatives --install
install表示安装
link是符号链接
name则是标识符
path是执行文件的路径
priority则表示优先级

alternatives --install /usr/bin/java java /opt/jdk1.8.0_221/bin/java 2
//选择程序
alternatives --config java
//因为之前装过，所有多个，这里我们选择3
-----------------------------------------------
共有 3 个提供“java”的程序。

  选项    命令
-----------------------------------------------
 + 1           /opt/jdk-12.0.2/bin/java
*  2           java-1.8.0-openjdk.x86_64 (/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.222.b10-0.el7_6.x86_64/jre/bin/java)
   3           /opt/jdk1.8.0_221/bin/java

按 Enter 保留当前选项[+]，或者键入选项编号：3

alternatives --install /usr/bin/jar jar /opt/jdk1.8.0_221/bin/jar 2
alternatives --install /usr/bin/javac javac /opt/jdk1.8.0_221/bin/javac 2
alternatives --set jar /opt/jdk1.8.0_221/bin/jar
alternatives --set javac /opt/jdk1.8.0_221/bin/javac

java -version
//装完了看一下版本信息
java version "1.8.0_221"
Java(TM) SE Runtime Environment (build 1.8.0_221-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.221-b11, mixed mode)

配置环境

vi + /etc/profile
// 在最后面添加
export JAVA_HOME=/opt/jdk1.8.0_221
export CLASSPATH=.:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
export PATH=$PATH:$JAVA_HOME/bin
//重载
source /etc/profile

安装 Cassandra 数据库

yum install https://www.apache.org/dist/cassandra/redhat/311x/cassandra-3.11.4-1.noarch.rpm


依赖关系解决

=================================================================================================================================
 Package                    架构                    版本                       源                                           大小
=================================================================================================================================
正在安装:
 cassandra                  noarch                  3.11.4-1                   /cassandra-3.11.4-1.noarch                   38 M

事务概要
=================================================================================================================================
安装  1 软件包

使用密码登陆

#修改配置文件 authenticator 项
authenticator: AllowAllAuthenticator
改为 PasswordAuthenticator


//设置文件夹权限
chown -R cassandra.cassandra /var/lib/cassandra/ 

//启动服务
service cassandra  start

//看查看集群信息
nodetool status

Datacenter: datacenter1
=======================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address    Load       Tokens       Owns (effective)  Host ID                               Rack
UN  127.0.0.1  114.74 KiB  256          100.0%            547d1aa6-326a-43a3-871d-ead1f0fb132d  rack1

//无密码登陆会提示没有权限
cqlsh
Connection error: ('Unable to connect to any servers', {'127.0.0.1': AuthenticationFailed('Remote end requires authentication.',)})

//使用默认用户名和密码登陆
cqlsh -ucassandra -pcassandra

Connected to Test Cluster at 127.0.0.1:9042.
[cqlsh 5.0.1 | Cassandra 3.11.4 | CQL spec 3.4.4 | Native protocol v4]
Use HELP for help.
cassandra@cqlsh>

设置用户名和密码

// 创建新用户和密码
cassandra@cqlsh> CREATE USER ncc with PASSWORD '123456' SUPERUSER;
cassandra@cqlsh> quit

// 测试登陆

cqlsh -uncc -p123456
Connected to Test Cluster at 127.0.0.1:9042.
[cqlsh 5.0.1 | Cassandra 3.11.4 | CQL spec 3.4.4 | Native protocol v4]
Use HELP for help.
ncc@cqlsh> 

// 删除原来的默认账号
DROP USER cassandra ;