Windy's Blog

To create an EMQX cluster to provide MQTT service and keep it as simple as much, we can do it with docker and docker-compose only.

Create /volumes/emqx-data/ on each node for persistent storage of configuration. Make sure to give write permissions.

On the first node (192.168.31.61), create a docker-compose.yaml file with content below

version: '3'

services:
  emqx1:
    image: emqx:5.5.0
    container_name: emqx1
    environment:
    - "EMQX_NAME=emqx1"
    - "EMQX_HOST=192.168.31.61"
    - "EMQX_NODE_NAME=emqx1@192.168.31.61"
    - "EMQX_CLUSTER__DISCOVERY_STRATEGY=static"
    - "EMQX_CLUSTER__STATIC__SEEDS=[emqx1@192.168.31.61,emqx2@192.168.31.62,emqx3@192.168.31.63]"
    network_mode: "host"
    healthcheck:
      test: ["CMD", "/opt/emqx/bin/emqx_ctl", "status"]
      interval: 5s
      timeout: 25s
      retries: 5
    volumes:
      - /volumes/emqx-data/emqx1_data:/opt/emqx/data

On the second node (192.168.31.62), create a similar docker-compose.yaml file with content below

version: '3'

services:
  emqx1:
    image: emqx:5.5.0
    container_name: emqx2
    environment:
    - "EMQX_NAME=emqx2"
    - "EMQX_HOST=192.168.31.62"
    - "EMQX_NODE_NAME=emqx2@192.168.31.62"
    - "EMQX_CLUSTER__DISCOVERY_STRATEGY=static"
    - "EMQX_CLUSTER__STATIC__SEEDS=[emqx1@192.168.31.61,emqx2@192.168.31.62,emqx3@192.168.31.63]"
    network_mode: "host"
    healthcheck:
      test: ["CMD", "/opt/emqx/bin/emqx_ctl", "status"]
      interval: 5s
      timeout: 25s
      retries: 5
    volumes:
      - /volumes/emqx-data/emqx2_data:/opt/emqx/data

On the third node (192.168.31.63), similarly

version: '3'

services:
  emqx1:
    image: emqx:5.5.0
    container_name: emqx3
    environment:
    - "EMQX_NAME=emqx3"
    - "EMQX_HOST=192.168.31.63"
    - "EMQX_NODE_NAME=emqx3@192.168.31.63"
    - "EMQX_CLUSTER__DISCOVERY_STRATEGY=static"
    - "EMQX_CLUSTER__STATIC__SEEDS=[emqx1@192.168.31.61,emqx2@192.168.31.62,emqx3@192.168.31.63]"
    network_mode: "host"
    healthcheck:
      test: ["CMD", "/opt/emqx/bin/emqx_ctl", "status"]
      interval: 5s
      timeout: 25s
      retries: 5
    volumes:
      - /volumes/emqx-data/emqx3_data:/opt/emqx/data

Enter the folder where the docker-compose.yaml file is located, execute docker compose up -d

If nothing goes wrong, you should be able to see a running container with STATUS as healthy.

By visiting the webpage http://192.168.31.61:18083 (default credentials: admin/public), you should be able to see 3 nodes in cluster.

If you need high-availability, you should carry on deploying nginx or HAProxy, or alternatively, utilize load balancers on cloud to distribute traffic to ports on these EMQX nodes.

由于我作（zuō），重新刷了Raspberry Pi Zero W的系统，所以原来的lighttpd配置需要恢复。但恢复不是简单地把配置文件一覆盖就好了（覆盖完发现访问不符合预期）。折腾了两天时间才搞定，所以记录一下，以备下次再作（zuō）或者手痒。

第一个简单，下载最新的AriaNg，解压缩放到server.document-root下即可。

第二个原配置文件中有一段

$HTTP[“url”] =~ “^/file” {

server.document-root = “/mnt/”

dir-listing.activate = “enable”

}

参考原配置，在/etc/lighttpd/conf-enabled/目录下创建了10-dir-listing.conf的软连接，用于开启目录下文件列举

此时访问<host>:80/file却报错404，百思不得其解。$HTTP["url"] =~ "^/file" 这个条件时当时调了好久才调对的呀……我拷贝配置文件过来没改过呀……

accesslog和errorlog几乎没有日志……

最后不知道为啥搜到了debug开关，https://redmine.lighttpd.net/projects/lighttpd/wiki/Debugvariables

主配置文件中增加一行

debug.log-request-handling = "enable" 

然后访问的时候看到了访问/file会导致lighttpd读取/mnt/file目录……

于是在/mnt/目录下创建了一个file的软连接，指向/mnt/toshiba后，就解决了这个问题

1. 从官网下载安装包

下载页 https://www.teamspeak.com/zh-CN/downloads/

或者直接点击下面这个链接下载当前最新版本3.5.6

https://files.teamspeak-services.com/releases/client/3.6.2/TeamSpeak3-Client-win64-3.6.2.exe

如果下载有困难，可以从我的服务器下载 https://windywind.tk:8080/TeamSpeak3-Client-win64-3.6.2.exe

2. 下载汉化包

Github链接 https://github.com/jitingcn/TS3-Translation_zh-CN/releases/download/snapshot/Chinese_Translation_zh-CN.ts3_translation

如果下载有困难，可以从我的服务器下载 https://windywind.tk:8080/Chinese_Translation_zh-CN.ts3_translation

3. 安装客户端

打开TeamSpeak3-Client-win64-3.5.6.exe完成安装，并启动一次

安装过程中，在许可页面需要拖到最下面，然后才能够选接受协议

4. 安装汉化包

双击打开Chinese_Translation_zh-CN.ts3_translation安装

然后再次启动TeamSpeak就应该是简体中文界面了

• 强大的编码图形化分析工具
  
  Understand offers graphs that allow you to see how your code connects (dependencies), how it flows (control flow graphs), what functions call other functions (call graphs), and many more. There are many customization options to easily allow you to display only what you are interested in seeing so the graph is best suited to what you need.（摘自官网）

• 支持编程语言不算多，但目前够用：

• 多平台：MacOS、Windows、Linux

• 所有版本下载地址：https://scitools.com/download/all-builds/（页面上的zip包只是安装包压缩了一下……不懂为什么要这么做）

• 中文版下载地址：https://scitools.com/download/chinese/ （换了个软件名字？还是只是中文翻译补丁？not sure）中文版Build944不支持用Code离线注册，还是用英文版吧

• XX注册很easy

——本文以本地ISO镜像为例，说明Kickstart安装

Kickstart 给用户提供了一种自动化安装红帽企业Linux 的方法。Kickstart 文件可以存放于单一的服务器上，在安装过程中被独立的机器所读取。这个安装方法可以支持使用单一Kickstart 文件在多台机器上安装红帽企业版Linux。

Kickstart 安装可以使用本地光盘、本地硬盘驱动器，或通过NFS、FTP、HTTP 来执行。使用原版光盘内的文件即可制作一张Kickstart无人值守光盘。

1. 安装kickstart 软件

#yum -y install system-config-kickstart

2. 打开kickstart 工具配置ks 脚本

#system-config-kickstart &

3. 基本配置

指定root密码、安装方式、bootloader配置、分区配置、网络配置、认证配置、SELinux及防火墙、显示配置、安装的软件包、安装前脚本、安装后脚本。

配置完成后保存为文件即可（我在附录中附上了一个示例）。

4. 配置isolinux

以/local/为本地光盘拷贝的根目录为例，进入修改/local/isolinux/isolinux.cfg，将第一行改为

default ks

在文件末尾添加

label ks

kernel vmlinuz

append ks=cdrom:/ks.cfg initrd=initrd.img

5. 生成ISO镜像

将保存的Kickstart配置文件复制到/local/下，运行iso.sh脚本。脚本内容如下：

#/bin/sh!

mkisofs -v -R -J -joliet-long -ucs-level 3 -input-charset utf8 \

-V”rhel6.2_x86_64″ \

-c boot.cat -hide boot.cat -b isolinux/isolinux.bin \

-no-emul-boot -boot-load-size 4 -boot-info-table \

-o /root/myrhel6.2.iso /local/

其中，-o后的参数为输出文件，最后的目录为制作ISO镜像的源目录。

6. 使用Kickstart光盘

使用镜像或刻录好的光盘引导启动主机，即可完成系统部署。

7. 其他使用方法

制作好的Kickstart光盘或者原版光盘，在anaconda引导界面按ESC进入boot:提示符，输入linux ks=<kickstart config path>也可以按照所给的Kickstart配置进行无人值守安装（比如使用存放在可匿名访问的FTP服务器上的Kickstart配置文件），这样即可免去制作光盘的麻烦。

附录

ks.cfg

#platform=x86, AMD64, or Intel EM64T

#version=DEVEL

# Firewall configuration

firewall –disabled                                                                     //防火墙设置

# Install OS instead of upgrade

install

# Use CDROM installation media

cdrom                                                                  //安装源是否使用CDROM

# Root password

rootpw –iscrypted $1$FqrifQqR$n4.1vXH9d7z558nswOKVh1                  //root密码（加密或明文）

# System authorization information

auth  –useshadow  –passalgo=sha512

# Use graphical install

graphical

firstboot –disable

# System keyboard

keyboard us                                                                                               //键盘布局

# System language

lang en_US                                                                                            //系统语言

# SELinux configuration

selinux –disabled                                                                                 //SELinux设置

# Installation logging level

logging –level=info

# Reboot after installation

reboot –eject                                                                                        //安装后重启，弹出光盘

# System timezone

timezone  Asia/Shanghai                                                                        //时区设置

# System bootloader configuration

bootloader –location=mbr

# Clear the Master Boot Record

zerombr

# Partition clearing information

clearpart –all –initlabel

# Disk partitioning information

part /boot –fstype=”ext4″ –size=200                                                          //分区配置

part swap –fstype=”swap” –size=10240

part / –fstype=”ext4″ –grow –size=1

%packages                                                                                                   //软件包

@base

@basic-desktop

@chinese-support

@client-mgmt-tools

@debugging

@desktop-debugging

@desktop-platform

@directory-client

@fonts

@general-desktop

@graphical-admin-tools

@input-methods

@internet-browser

@java-platform

@legacy-x

@network-file-system-client

@perl-runtime

@print-client

@remote-desktop-clients

@server-platform

@x11

%end