CentOS 8.2上安裝Cassandra Web部署
阿新 • • 發佈：2020-12-21
目錄
- 什麼是Cassandra Web？
- 環境規格：
- 第一步：CentOS 8上安裝Ruby
- 第二步：安裝Cassandra Web必備軟體包
- 第三步：安裝Cassandra Web介面
- 第四步：Cassandra Web配置CentOS 8防火牆
- 第五步：Cassandra Web建立資料庫使用者
- 第六步：Cassandra Web介面啟動
- 第七步：Cassandra Web建立系統服務
- 結論：
在本文中，您將學習如何在CentOS 8上安裝Cassandra Web介面。
什麼是Cassandra Web？
Cassandra Web是帶有AngularJS和伺服器傳送的事件的Apache Cassandra
Cassandra Web是功能有限的非常簡單的應用程式，但是它可以通過單個Web介面實現監視整個Apache Cassandra叢集的目的。
環境規格：
-
CPU：3.4 GHz（2核）
-
記憶體：2 GB
-
儲存空間：20 GB
-
作業系統：CentOS 8.2
-
主機名: cassandra.liangglab.cn
-
IP地址:192.168.6.65/24
前面我們已經安裝 CentOS 8.2上安裝Apache Cassandra 3.11.9 所以我們現在不需要安裝Cassandra，我們現在直接在這臺機器上安裝Cassandra Web
第一步：CentOS 8上安裝Ruby
我們需要Rubygems軟體包管理器才能在CentOS 8上安裝Cassandra Web，我們正在使用dnf命令 安裝Ruby 安裝相關軟體包。
[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：安裝Cassandra Web必備軟體包
要使用rubygems安裝Cassandra Web ，我們需要make和build軟體包。我們正在使用單個dnf命令安裝所有必需的軟體包。
[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：安裝Cassandra Web介面
我們準備安裝Cassandra Web介面。我們正在執行以下gem命令以將其安裝在我們的CentOS 8伺服器上。
[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介面也需要Ruby Bundler gem。因此，我們現在也正在安裝它。
[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防火牆
Cassandra Web介面預設埠3000/tcp上執行。因此，我們需要在Linux防火牆中允許3000埠流入。
[root@cassandra ~]# firewall-cmd --permanent --add-port=3000/tcp
success
[root@cassandra ~]# firewall-cmd --reload
success
第五步：Cassandra Web建立資料庫使用者
要訪問Apache Cassandra節點，Cassandra Web介面需要一個Admin使用者。因此，我們為此建立一個數據庫使用者，如下所示。
[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介面啟動
通過使用以下命令語法來啟動Cassandra Web介面。如果已在另一個節點上執行Apache Cassandra資料庫，則必須根據您的環境從以下命令更改主機地址。
[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
在客戶端的瀏覽器 開啟URL http://192.168.6.65:3000,Cassandra Web介面執行正常。
Cassandra Web不提供任何使用者身份驗證。但是，我們可以配置HTTP基本身份驗證來控制對Cassandra Web介面的訪問。
單擊system_schema。
CTRL+C to 會停止3000埠監聽，需要建立一個Cassandra web服務
第七步：Cassandra Web建立系統服務
為了自動啟動Cassandra Web應用程式，我們可以建立一個簡單的Systemd服務。
為Cassandra Web建立一個Systemd服務檔案。
[root@cassandra ~]# vi /usr/lib/systemd/system/cassweb.service
新增以下程式碼行。
[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
啟動Cassandra Web服務。
[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服務已啟動。
結論：
我們的Cassandra Web介面已經在CentOS 8上安裝完成，並且執行良好。