- 什么是Cassandra Web？
- 环境规格：
- 第一步：CentOS 8上安装Ruby
- 第二步：安装Cassandra Web必备软件包
- 第三步：安装Cassandra Web界面
- 第四步：Cassandra Web配置CentOS 8防火墙
- 第五步：Cassandra Web创建数据库用户
- 第六步：Cassandra Web界面启动
- 第七步：Cassandra Web创建系统服务
- 结论：
在本文中，您将学习如何在CentOS 8上安装Cassandra Web界面。
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上获得。
Cassandra Web是功能有限的非常简单的应用程序，但是它可以通过单个Web界面实现监视整个Apache Cassandra集群的目的。
环境规格：
CPU：3.4 GHz（2核）
内存：2 GB
储存空间：20 GB
作业系统：CentOS 8.2
主机名: cassandra.liangglab.cn
IP地址:192.168.6.65/24
前面我们已经安装 CentOS 8.2上安装Apache Cassandra 3.11.9 所以我们现在不需要安装Cassandra，我们现在直接在这台机器上安装Cassandra Web
第一步：CentOS 8上安装Ruby
我们需要Rubygems软件包管理器才能在CentOS 8上安装Cassandra Web，我们正在使用dnf命令 安装Ruby 安装相关软件包。
[root@cassandra ~]# dnf install -y rubygems ruby-develLast 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 kInstalling 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 kInstalling 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 kEnabling module streams: ruby 2.5 Transaction Summary====================================================================================================================Install 12 PackagesTotal download size: 4.6 MInstalled size: 15 MDownloading 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 checkTransaction check succeeded.Running transaction testTransaction 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 ，我们需要make和build软件包。我们正在使用单个dnf命令安装所有必需的软件包。
[root@cassandra ~]# dnf install -y make gcc gcc-c++ redhat-rpm-configLast 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 MInstalling dependencies: libstdc++-devel x86_64 8.3.1-5.el8.0.2 AppStream 2.0 MTransaction Summary====================================================================================================================Install 2 PackagesTotal download size: 14 MInstalled size: 42 MDownloading 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 checkTransaction check succeeded.Running transaction testTransaction 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
我们准备安装Cassandra Web界面。我们正在执行以下gem命令以将其安装在我们的CentOS 8服务器上。
[root@cassandra ~]# gem install cassandra-webFetching: lz4-ruby-0.3.3.gem (100%)Building native extensions. This could take a while...Successfully installed lz4-ruby-0.3.3Fetching: rack-1.6.13.gem (100%)Successfully installed rack-1.6.13Fetching: rack-protection-1.5.5.gem (100%)Successfully installed rack-protection-1.5.5Fetching: tilt-2.0.10.gem (100%)Successfully installed tilt-2.0.10Fetching: sinatra-1.4.8.gem (100%)Successfully installed sinatra-1.4.8Fetching: rack-parser-0.7.0.gem (100%)Successfully installed rack-parser-0.7.0Fetching: rack-cors-0.4.1.gem (100%)Successfully installed rack-cors-0.4.1Fetching: eventmachine-1.2.7.gem (100%)Building native extensions. This could take a while...Successfully installed eventmachine-1.2.7Fetching: daemons-1.3.1.gem (100%)Successfully installed daemons-1.3.1Fetching: thin-1.8.0.gem (100%)Building native extensions. This could take a while...Successfully installed thin-1.8.0Fetching: ione-1.2.4.gem (100%)Successfully installed ione-1.2.4Fetching: cassandra-driver-3.2.5.gem (100%)Building native extensions. This could take a while...Successfully installed cassandra-driver-3.2.5Fetching: cassandra-web-0.5.0.gem (100%)Successfully installed cassandra-web-0.5.013 gems installedCassandra Web界面也需要Ruby Bundler gem。因此，我们现在也正在安装它。
[root@cassandra ~]# gem install bundlerFetching: bundler-2.2.2.gem (100%)Successfully installed bundler-2.2.21 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。因此，我们需要在Linux防火墙中允许3000端口流入。
[root@cassandra ~]# firewall-cmd --permanent --add-port=3000/tcpsuccess[root@cassandra ~]# firewall-cmd --reloadsuccess第五步：Cassandra Web创建数据库用户
要访问Apache Cassandra节点，Cassandra Web界面需要一个Admin用户。因此，我们为此创建一个数据库用户，如下所示。
[root@cassandra ~]# cqlsh -u lianglab -p lianglab@123Connected 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
通过使用以下命令语法来启动Cassandra Web界面。如果已在另一个节点上运行Apache Cassandra数据库，则必须根据您的环境从以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 connectionI, [2020-12-21T19:49:51.089534 #58769] INFO -- : Refreshing connected host's metadataI, [2020-12-21T19:49:51.096746 #58769] INFO -- : Completed refreshing connected host's metadataI, [2020-12-21T19:49:51.098335 #58769] INFO -- : Refreshing peers metadataI, [2020-12-21T19:49:51.099710 #58769] INFO -- : Completed refreshing peers metadataI, [2020-12-21T19:49:51.099780 #58769] INFO -- : Refreshing schemaI, [2020-12-21T19:49:51.122821 #58769] INFO -- : Schema refreshedI, [2020-12-21T19:49:51.122871 #58769] INFO -- : Control connection establishedI, [2020-12-21T19:49:51.123174 #58769] INFO -- : Creating sessionI, [2020-12-21T19:49:51.214760 #58769] INFO -- : Session created2020-12-21 19:49:51 +0800 Thin web server (v1.8.0 codename Possessed Pickle)2020-12-21 19:49:51 +0800 Maximum connections set to 10242020-12-21 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 Cassandra Web不提供任何用户身份验证。但是，我们可以配置HTTP基本身份验证来控制对Cassandra Web界面的访问。 单击system_schema。 CTRL+C to 会停止3000端口监听，需要创建一个Cassandra web服务 为了自动启动Cassandra Web应用程序，我们可以创建一个简单的Systemd服务。 为Cassandra Web创建一个Systemd服务文件。 添加以下代码行。 启动Cassandra Web服务。 Cassandra Web服务已启动。 我们的Cassandra Web界面已经在CentOS 8上安装完成，并且运行良好。 原文转载：http://www.shaoqun.com/a/502564.html tm商标：https://www.ikjzd.com/w/1069 zappos.com：https://www.ikjzd.com/w/330
第七步：Cassandra Web创建系统服务
[root@cassandra ~]# vi /usr/lib/systemd/system/cassweb.service[Unit]Description=Cassandra Web[Service]Type=simpleExecStart=cassandra-web --hosts '127.0.0.1' --port '9042' --username 'cassweb' --password 'Cassweb@123'[Install]WantedBy=multi-user.target[root@cassandra ~]# systemctl enable --now cassweb.serviceCreated symlink /etc/systemd/system/multi-user.target.wants/cassweb.service → /usr/lib/systemd/system/cassweb.service.[root@cassandra ~]# netstat -antpl | grep 3000tcp 0 0 0.0.0.0:3000 0.0.0.0:* LISTEN 59130/ruby [root@cassandra ~]#结论：
目录什么是CassandraWeb？环境规格：第一步：CentOS8上安装Ruby第二步：安装CassandraWeb必备软件包第三步：安装CassandraWeb界面第四步：CassandraWeb配置CentOS8防火墙第五步：CassandraWeb创建数据库用户第六步：CassandraWeb界面启动第七步：CassandraWeb创建系统服务结论：在本文中，您将学习如何在CentOS8上
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