CentOS 8.2上安装Cassandra Web部署

时间 2021-01-15

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在本文中，您将学习如何在CentOS 8上安装Cassandra Web界面。html

什么是Cassandra Web？

Cassandra Web是带有AngularJS和服务器发送的事件的Apache Cassandra的Web界面。Cassandra Web是免费的开放源代码，其源代码可在GitHub上得到。c++

Cassandra Web是功能有限的很是简单的应用程序，可是它能够经过单个Web界面实现监视整个Apache Cassandra集群的目的。git

环境规格：

CPU：3.4 GHz（2核）angularjs
内存：2 GBgithub
储存空间：20 GBweb
做业系统：CentOS 8.2shell
主机名: cassandra.liangglab.cn数据库
IP地址:192.168.6.65/24apache

前面咱们已经安装 CentOS 8.2上安装Apache Cassandra 3.11.9 因此咱们如今不须要安装Cassandra，咱们如今直接在这台机器上安装Cassandra Webjson

第一步：CentOS 8上安装Ruby

咱们须要Rubygems软件包管理器才能在CentOS 8上安装Cassandra Web，咱们正在使用dnf命令安装Ruby 安装相关软件包。

[root@cassandra ~]# dnf install -y rubygems ruby-devel
Last metadata expiration check: 1:31:25 ago on Mon 21 Dec 2020 06:10:25 PM CST.
Dependencies resolved.
====================================================================================================================
 Package                     Architecture  Version                                           Repository        Size
====================================================================================================================
Installing:
 ruby-devel                  x86_64        2.5.5-105.module_el8.1.0+214+9be47fd7             AppStream        126 k
 rubygems                    noarch        2.7.6.2-105.module_el8.1.0+214+9be47fd7           AppStream        308 k
Installing dependencies:
 ruby                        x86_64        2.5.5-105.module_el8.1.0+214+9be47fd7             AppStream         86 k
 ruby-irb                    noarch        2.5.5-105.module_el8.1.0+214+9be47fd7             AppStream        102 k
 ruby-libs                   x86_64        2.5.5-105.module_el8.1.0+214+9be47fd7             AppStream        2.9 M
 rubygem-json                x86_64        2.1.0-105.module_el8.1.0+214+9be47fd7             AppStream         90 k
 rubygem-openssl             x86_64        2.1.2-105.module_el8.1.0+214+9be47fd7             AppStream        190 k
 rubygem-psych               x86_64        3.0.2-105.module_el8.1.0+214+9be47fd7             AppStream         95 k
Installing weak dependencies:
 rubygem-bigdecimal          x86_64        1.3.4-105.module_el8.1.0+214+9be47fd7             AppStream         97 k
 rubygem-did_you_mean        noarch        1.2.0-105.module_el8.1.0+214+9be47fd7             AppStream         90 k
 rubygem-io-console          x86_64        0.4.6-105.module_el8.1.0+214+9be47fd7             AppStream         66 k
 rubygem-rdoc                noarch        6.0.1-105.module_el8.1.0+214+9be47fd7             AppStream        486 k
Enabling module streams:
 ruby                                      2.5                                                                     

Transaction Summary
====================================================================================================================
Install  12 Packages

Total download size: 4.6 M
Installed size: 15 M
Downloading Packages:
(1/12): ruby-devel-2.5.5-105.module_el8.1.0+214+9be47fd7.x86_64.rpm                 6.3 MB/s | 126 kB     00:00    
(2/12): ruby-2.5.5-105.module_el8.1.0+214+9be47fd7.x86_64.rpm                       3.9 MB/s |  86 kB     00:00    
(3/12): ruby-irb-2.5.5-105.module_el8.1.0+214+9be47fd7.noarch.rpm                   4.4 MB/s | 102 kB     00:00    
(4/12): rubygem-bigdecimal-1.3.4-105.module_el8.1.0+214+9be47fd7.x86_64.rpm         5.2 MB/s |  97 kB     00:00    
(5/12): rubygem-did_you_mean-1.2.0-105.module_el8.1.0+214+9be47fd7.noarch.rpm       4.2 MB/s |  90 kB     00:00    
(6/12): rubygem-io-console-0.4.6-105.module_el8.1.0+214+9be47fd7.x86_64.rpm          14 MB/s |  66 kB     00:00    
(7/12): rubygem-json-2.1.0-105.module_el8.1.0+214+9be47fd7.x86_64.rpm                20 MB/s |  90 kB     00:00    
(8/12): rubygem-openssl-2.1.2-105.module_el8.1.0+214+9be47fd7.x86_64.rpm             21 MB/s | 190 kB     00:00    
(9/12): rubygem-psych-3.0.2-105.module_el8.1.0+214+9be47fd7.x86_64.rpm               10 MB/s |  95 kB     00:00    
(10/12): rubygems-2.7.6.2-105.module_el8.1.0+214+9be47fd7.noarch.rpm                 20 MB/s | 308 kB     00:00    
(11/12): rubygem-rdoc-6.0.1-105.module_el8.1.0+214+9be47fd7.noarch.rpm               19 MB/s | 486 kB     00:00    
(12/12): ruby-libs-2.5.5-105.module_el8.1.0+214+9be47fd7.x86_64.rpm                  38 MB/s | 2.9 MB     00:00    
--------------------------------------------------------------------------------------------------------------------
Total                                                                                47 MB/s | 4.6 MB     00:00     
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
  Preparing        :                                                                                            1/1 
  Installing       : ruby-libs-2.5.5-105.module_el8.1.0+214+9be47fd7.x86_64                                    1/12 
  Installing       : ruby-irb-2.5.5-105.module_el8.1.0+214+9be47fd7.noarch                                     2/12 
  Installing       : rubygem-bigdecimal-1.3.4-105.module_el8.1.0+214+9be47fd7.x86_64                           3/12 
  Installing       : rubygem-did_you_mean-1.2.0-105.module_el8.1.0+214+9be47fd7.noarch                         4/12 
  Installing       : rubygem-io-console-0.4.6-105.module_el8.1.0+214+9be47fd7.x86_64                           5/12 
  Installing       : rubygem-json-2.1.0-105.module_el8.1.0+214+9be47fd7.x86_64                                 6/12 
  Installing       : rubygem-openssl-2.1.2-105.module_el8.1.0+214+9be47fd7.x86_64                              7/12 
  Installing       : rubygem-psych-3.0.2-105.module_el8.1.0+214+9be47fd7.x86_64                                8/12 
  Installing       : rubygem-rdoc-6.0.1-105.module_el8.1.0+214+9be47fd7.noarch                                 9/12 
  Installing       : rubygems-2.7.6.2-105.module_el8.1.0+214+9be47fd7.noarch                                  10/12 
  Installing       : ruby-2.5.5-105.module_el8.1.0+214+9be47fd7.x86_64                                        11/12 
  Installing       : ruby-devel-2.5.5-105.module_el8.1.0+214+9be47fd7.x86_64                                  12/12 
  Running scriptlet: ruby-devel-2.5.5-105.module_el8.1.0+214+9be47fd7.x86_64                                  12/12 
  Verifying        : ruby-2.5.5-105.module_el8.1.0+214+9be47fd7.x86_64                                         1/12 
  Verifying        : ruby-devel-2.5.5-105.module_el8.1.0+214+9be47fd7.x86_64                                   2/12 
  Verifying        : ruby-irb-2.5.5-105.module_el8.1.0+214+9be47fd7.noarch                                     3/12 
  Verifying        : ruby-libs-2.5.5-105.module_el8.1.0+214+9be47fd7.x86_64                                    4/12 
  Verifying        : rubygem-bigdecimal-1.3.4-105.module_el8.1.0+214+9be47fd7.x86_64                           5/12 
  Verifying        : rubygem-did_you_mean-1.2.0-105.module_el8.1.0+214+9be47fd7.noarch                         6/12 
  Verifying        : rubygem-io-console-0.4.6-105.module_el8.1.0+214+9be47fd7.x86_64                           7/12 
  Verifying        : rubygem-json-2.1.0-105.module_el8.1.0+214+9be47fd7.x86_64                                 8/12 
  Verifying        : rubygem-openssl-2.1.2-105.module_el8.1.0+214+9be47fd7.x86_64                              9/12 
  Verifying        : rubygem-psych-3.0.2-105.module_el8.1.0+214+9be47fd7.x86_64                               10/12 
  Verifying        : rubygem-rdoc-6.0.1-105.module_el8.1.0+214+9be47fd7.noarch                                11/12 
  Verifying        : rubygems-2.7.6.2-105.module_el8.1.0+214+9be47fd7.noarch                                  12/12 
Installed products updated.

Installed:
  ruby-2.5.5-105.module_el8.1.0+214+9be47fd7.x86_64                                                                 
  ruby-devel-2.5.5-105.module_el8.1.0+214+9be47fd7.x86_64                                                           
  ruby-irb-2.5.5-105.module_el8.1.0+214+9be47fd7.noarch                                                             
  ruby-libs-2.5.5-105.module_el8.1.0+214+9be47fd7.x86_64                                                            
  rubygem-bigdecimal-1.3.4-105.module_el8.1.0+214+9be47fd7.x86_64                                                   
  rubygem-did_you_mean-1.2.0-105.module_el8.1.0+214+9be47fd7.noarch                                                 
  rubygem-io-console-0.4.6-105.module_el8.1.0+214+9be47fd7.x86_64                                                   
  rubygem-json-2.1.0-105.module_el8.1.0+214+9be47fd7.x86_64                                                         
  rubygem-openssl-2.1.2-105.module_el8.1.0+214+9be47fd7.x86_64                                                      
  rubygem-psych-3.0.2-105.module_el8.1.0+214+9be47fd7.x86_64                                                        
  rubygem-rdoc-6.0.1-105.module_el8.1.0+214+9be47fd7.noarch                                                         
  rubygems-2.7.6.2-105.module_el8.1.0+214+9be47fd7.noarch                                                           

Complete!
[root@cassandra ~]#

第二步：安装Cassandra Web必备软件包

要使用rubygems安装Cassandra Web ，咱们须要make和build软件包。咱们正在使用单个dnf命令安装全部必需的软件包。

[root@cassandra ~]# dnf install -y make gcc gcc-c++ redhat-rpm-config
Last metadata expiration check: 1:32:13 ago on Mon 21 Dec 2020 06:10:25 PM CST.
Package make-1:4.2.1-10.el8.x86_64 is already installed.
Package gcc-8.3.1-5.el8.0.2.x86_64 is already installed.
Package redhat-rpm-config-122-1.el8.noarch is already installed.
Dependencies resolved.
====================================================================================================================
 Package                        Architecture          Version                        Repository                Size
====================================================================================================================
Installing:
 gcc-c++                        x86_64                8.3.1-5.el8.0.2                AppStream                 12 M
Installing dependencies:
 libstdc++-devel                x86_64                8.3.1-5.el8.0.2                AppStream                2.0 M

Transaction Summary
====================================================================================================================
Install  2 Packages

Total download size: 14 M
Installed size: 42 M
Downloading Packages:
(1/2): libstdc++-devel-8.3.1-5.el8.0.2.x86_64.rpm                                    27 MB/s | 2.0 MB     00:00    
(2/2): gcc-c++-8.3.1-5.el8.0.2.x86_64.rpm                                            57 MB/s |  12 MB     00:00    
--------------------------------------------------------------------------------------------------------------------
Total                                                                                66 MB/s |  14 MB     00:00     
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
  Preparing        :                                                                                            1/1 
  Installing       : libstdc++-devel-8.3.1-5.el8.0.2.x86_64                                                     1/2 
  Installing       : gcc-c++-8.3.1-5.el8.0.2.x86_64                                                             2/2 
  Running scriptlet: gcc-c++-8.3.1-5.el8.0.2.x86_64                                                             2/2 
  Verifying        : gcc-c++-8.3.1-5.el8.0.2.x86_64                                                             1/2 
  Verifying        : libstdc++-devel-8.3.1-5.el8.0.2.x86_64                                                     2/2 
Installed products updated.

Installed:
  gcc-c++-8.3.1-5.el8.0.2.x86_64                       libstdc++-devel-8.3.1-5.el8.0.2.x86_64                      

Complete!
[root@cassandra ~]#

第三步：安装Cassandra Web界面

咱们准备安装Cassandra Web界面。咱们正在执行如下gem命令以将其安装在咱们的CentOS 8服务器上。

[root@cassandra ~]# gem install cassandra-web
Fetching: lz4-ruby-0.3.3.gem (100%)
Building native extensions. This could take a while...
Successfully installed lz4-ruby-0.3.3
Fetching: rack-1.6.13.gem (100%)
Successfully installed rack-1.6.13
Fetching: rack-protection-1.5.5.gem (100%)
Successfully installed rack-protection-1.5.5
Fetching: tilt-2.0.10.gem (100%)
Successfully installed tilt-2.0.10
Fetching: sinatra-1.4.8.gem (100%)
Successfully installed sinatra-1.4.8
Fetching: rack-parser-0.7.0.gem (100%)
Successfully installed rack-parser-0.7.0
Fetching: rack-cors-0.4.1.gem (100%)
Successfully installed rack-cors-0.4.1
Fetching: eventmachine-1.2.7.gem (100%)
Building native extensions. This could take a while...
Successfully installed eventmachine-1.2.7
Fetching: daemons-1.3.1.gem (100%)
Successfully installed daemons-1.3.1
Fetching: thin-1.8.0.gem (100%)
Building native extensions. This could take a while...
Successfully installed thin-1.8.0
Fetching: ione-1.2.4.gem (100%)
Successfully installed ione-1.2.4
Fetching: cassandra-driver-3.2.5.gem (100%)
Building native extensions. This could take a while...
Successfully installed cassandra-driver-3.2.5
Fetching: cassandra-web-0.5.0.gem (100%)
Successfully installed cassandra-web-0.5.0
13 gems installed

Cassandra Web界面也须要Ruby Bundler gem。所以，咱们如今也正在安装它。

[root@cassandra ~]# gem install bundler
Fetching: bundler-2.2.2.gem (100%)
Successfully installed bundler-2.2.2
1 gem installed

第四步：Cassandra Web配置CentOS 8防火墙

Cassandra Web界面默认端口3000/tcp上运行。所以，咱们须要在Linux防火墙中容许3000端口流入。

[root@cassandra ~]# firewall-cmd --permanent --add-port=3000/tcp
success
[root@cassandra ~]# firewall-cmd --reload
success

第五步：Cassandra Web建立数据库用户

要访问Apache Cassandra节点，Cassandra Web界面须要一个Admin用户。所以，咱们为此建立一个数据库用户，以下所示。

[root@cassandra ~]# cqlsh -u lianglab -p lianglab@123
Connected to Test Cluster at 127.0.0.1:9042.
[cqlsh 5.0.1 | Cassandra 3.11.9 | CQL spec 3.4.4 | Native protocol v4]
Use HELP for help.
lianglab@cqlsh> 
lianglab@cqlsh> CREATE ROLE cassweb WITH PASSWORD = 'Cassweb@123' AND SUPERUSER = true AND LOGIN = true;
lianglab@cqlsh> exit
[root@cassandra ~]#

第六步：Cassandra Web界面启动

经过使用如下命令语法来启动Cassandra Web界面。若是已在另外一个节点上运行Apache Cassandra数据库，则必须根据您的环境从如下命令更改主机地址。

[root@cassandra ~]# cassandra-web --hosts '127.0.0.1' --port '9042' --username 'cassweb' --password 'Cassweb@123'
I, [2020-12-21T19:49:50.969783 #58769]  INFO -- : Establishing control connection
I, [2020-12-21T19:49:51.089534 #58769]  INFO -- : Refreshing connected host's metadata
I, [2020-12-21T19:49:51.096746 #58769]  INFO -- : Completed refreshing connected host's metadata
I, [2020-12-21T19:49:51.098335 #58769]  INFO -- : Refreshing peers metadata
I, [2020-12-21T19:49:51.099710 #58769]  INFO -- : Completed refreshing peers metadata
I, [2020-12-21T19:49:51.099780 #58769]  INFO -- : Refreshing schema
I, [2020-12-21T19:49:51.122821 #58769]  INFO -- : Schema refreshed
I, [2020-12-21T19:49:51.122871 #58769]  INFO -- : Control connection established
I, [2020-12-21T19:49:51.123174 #58769]  INFO -- : Creating session
I, [2020-12-21T19:49:51.214760 #58769]  INFO -- : Session created
2020-12-21 19:49:51 +0800 Thin web server (v1.8.0 codename Possessed Pickle)
2020-12-21 19:49:51 +0800 Maximum connections set to 1024
2020-12-21 19:49:51 +0800 Listening on 0.0.0.0:3000, CTRL+C to stop

在客户端的浏览器打开URL http://192.168.6.65:3000,Cassandra Web界面运行正常。

Cassandra Web不提供任何用户身份验证。可是，咱们能够配置HTTP基自己份验证来控制对Cassandra Web界面的访问。

单击system_schema。

CTRL+C to 会中止3000端口监听，须要建立一个Cassandra web服务

第七步：Cassandra Web建立系统服务

为了自动启动Cassandra Web应用程序，咱们能够建立一个简单的Systemd服务。

为Cassandra Web建立一个Systemd服务文件。

[root@cassandra ~]# vi /usr/lib/systemd/system/cassweb.service

添加如下代码行。

[Unit]
Description=Cassandra Web

[Service]
Type=simple
ExecStart=cassandra-web --hosts '127.0.0.1' --port '9042' --username 'cassweb' --password 'Cassweb@123'

[Install]
WantedBy=multi-user.target

启动Cassandra Web服务。

[root@cassandra ~]# systemctl enable --now cassweb.service
Created symlink /etc/systemd/system/multi-user.target.wants/cassweb.service → /usr/lib/systemd/system/cassweb.service.
[root@cassandra ~]# netstat -antpl | grep 3000
tcp        0      0 0.0.0.0:3000            0.0.0.0:*               LISTEN      59130/ruby          
[root@cassandra ~]#

Cassandra Web服务已启动。

结论：

咱们的Cassandra Web界面已经在CentOS 8上安装完成，而且运行良好。