A corner, a notebook... | Archive of 2020

July 2020

How to use...

Checkout code Set correct config file Scp to the remote machine Run deploy.sh on the remote machine by ssh docker-compose build --no-cache docker-compose down docker-compose up -d sshPublisher setup Manage Jenkins -> Config System Find Publish over SSH Add New Server, test connection Write directive in Jenkins file sshPublisher( continueOnError: false, failOnError: true, publishers: [ sshPublisherDesc( configName: "yt-files-${BRANCH}", verbose: true, transfers: [ sshTransfer( sourceFiles: "**/**", remoteDirectory: "./publish/${BRANCH}", removePrefix: '', remoteDirectorySDF: false, cleanRemote: true, execCommand: "cd ./publish/${BRANCH} && bash deploy.sh ${BRANCH}" ) ]) ] ) 要在Jenkins中新增对一个仓库的发布，需要以下步骤创建流水线，添加Git仓库，Credentials 为各分支添加必要的配置文件（不方便加入版本控制的机密信息）写 Jenkinsfile
Permanent link to “How to use Jenkins to deploy a Node.JS backend project?”

June 2020

Permanent link to “少年的你”
转换 gbk...

这都是为了看《非正常人类异闻录》 iconv -c -f gbk -t utf-8 待转文件名 > target.txt -c 的意思是在输出文本中忽略非法的字符序列 Reference
Permanent link to “转换 gbk txt文件为 utf-8 编码”
Permanent link to “观影《阿郎的故事》”
设置mysql用户...

我喜欢用 .my.cnf 配置 mysql 的登录信息，这样我执行一些命令的时候就不用在命令行上提供密码。但今天我被自己设置的”高强度密码“坑到了简而言之，如果你的密码里有#字符，请用双引号把整个密码括起来，否则的话 #当然会被解释成注释的开始，自然你就总是得到密码不正确的结果。
Permanent link to “设置mysql用户密码时小心 # 字符”
package name for...

ps apt install -y procps ping apt install -y iputils-ping telnet apt install -y telnet
Permanent link to “package name for common used Linux util in Debian/Ubuntu”
Samples for...

bash ASPNETCORE_URLS="http://*:9143" ASPNETCORE_ENVIRONMENT="Development" dotnet Yourproject.dll ASPNETCORE_ENVIRONMENT="Development" dotnet run --urls "http://*:9143" --no-launch-profile for Windows command line (cmd.exe) setx ASPNETCORE_URLS "http://localhost:5001" setx ASPNETCORE_ENVIRONMENT "Development" dotnet Yourproject.dll for Windows powershell $Env: ASPNETCORE_URLS "http://localhost:5001" $Env: ASPNETCORE_ENVIRONMENT "Development" dotnet Yourproject.dll Reference
Permanent link to “Samples for setting the urls and environment for a .net core application”
Using...

The keyboard shortcuts setting in the Settings app can only support 4 workspaces. However, I want to use 8 workspaces to implement the goal of "everything in its right place". Solution: sudo apt install dconf-editor dconf-editor org/gnome/desktop/wm/keybindings # Then you can do what you want to do there Reference By the way, my final configuration is shown below: Ctrl + 1-8 Switch to workspace 1-8 Ctrl+Alt+1-8 Move current window to workspace 1-8 and jump to that workspace Workspace 1: Chrome Workspace 2: Gnome-terminal Workspace 3: Rider Workspace 4: WebStorm Workspace 5: Ebook reader (Evince and others) Workspace 6: File Manager, BitTorrent downloader, Workspace 7: VMs Workspace 8: Settings, Telegram, music player, misc.
Permanent link to “Using dconf-editor to setup extra hot keys for the Gnome 3 desktop”
Jenkins...

Jenkins 虽然通过ssh访问一个node来执行build或者 deploy任务，而且它也确实执行了远程机器的.bashrc 脚本，但它却刻意的抹掉了PATH 环境变量。所以在你要运行的bash脚本里再 source 一遍 /etc/profile 就有了必要。 Jenkins自己的环境变量，可以在脚本里直接用，但从bash里来的环境变量，如 $?，就得用反斜线转义 \$ 符号。 .bashrc 别 echo 东西，否则 Jenkins 会拒绝干活。（应该弄一台专门的机器只跑 Jenkins）
Permanent link to “Jenkins 三言两语（二）”
Linux TIPS...

http_proxy environment in sudo command： http_proxy=xxx:xxx sudo yourcommand doesn't work, you should sudo http_proxy=xxx:yyy yourcommand instead. ssh running local script: ssh [email protected] 'bash -s' < your.local.script.sh ssh running local script with paraemters: ssh [email protected] < your.local.script.sh 'bash -s' yourparam1 yourparam2 doesn't work, you should runssh [email protected] < your.local.script.sh 'bash -s' -- yourparam1 yourparam2
Permanent link to “Linux TIPS collect (神奇的知识集合）”
Can't boot VMs...

I followed this article to upgrade the kernel of one of our Linux server runs CentOS8. According to that article, upgrade the kernel of a CentOS system is rather simple, you just need to run the following command as root: rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org dnf -y install https://www.elrepo.org/elrepo-release-8.0-2.el8.elrepo.noarch.rpm dnf -y --enablerepo=elrepo-kernel install kernel-ml Everything goes fine before I try to boot up one of the VM in Virtualbox 6. Boot failure, "The system is currently not set up to build kernel modules, please install the Linux kernel header files matching the current kernel.", it says. Obviously, we need the correct header file, after digging a while on Google, I didn't get an answer. Then I review the steps I have done to upgrade the kernel. Oh, I got the solution below: dnf -y --enablerepo=elrepo-kernel install kernel-ml-devel /sbin/rcvboxdrv setup Problem resolved.
Permanent link to “Can't boot VMs after host kernel upgrade (CentOS8)”
Making bootable...

You are already using Linux, so you have dd already, you don't need any other tools to make a bootable USB disk! sudo dd bs=1M if=galliumos-3.1-baytrail.iso of=/dev/sda ; sync Notice: You should use your iso file name and replace /dev/sda to your own USB disk device. Reference
Permanent link to “Making bootable usb stick by dd command”
ubuntu 20.04...

try to download something but axel said "SSL error: (null)", so axel https://github.com/axel-download-accelerator/axel/releases/download/v2.17.9/axel-2.17.9.tar.gz tar xvfz axel-2.17.9.tar.gz cd axel-2.17.9 sudo apt install pkg-config -y ./configure && make && sudo make install sudo apt remove axel cd .. rm -rf axel-2.17.9
Permanent link to “ubuntu 20.04 upgrade axel to 2.17.9”
vim 向上删除...

我们都知道从当前行往下删除 n 行很容易， ndd 就好了。但往上删除呢？我以前是不知道的，最近搜索了一下，找到了答案，而且额外学到了其他的技巧，你想听吗（不想听我也会写，哈哈 8dd其实是dd重复8次，容易记忆，但效率很低。正确的姿势是 7dj 或者 d7j。我想你看到这里已经猜到应该怎么向上删除了。如果打算从当前行往上删除n行，你需要 {n-1}dk 或者 d{n-1}k 故事到这里应该结束了，然而.... 试试 V3kd, V4jd，注意是大写的V。你会对vim的强大有更多的理解。
Permanent link to “vim 向上删除 n 行”
Permanent link to “观影喜剧片“大赢家””
离奇的axios返...

同事前两天遇到一个离奇的 axios 问题，response.data看上去非常正常，但无法访问这个对象里面的任何一个键。console.log(response.data) 一看果然是 string。同事很茫然，一直都好好的，也没有改什么啊。改了 db.json。里面有一个多余的逗号。axios解析json字符串失败，就一声没吭的返回了字符串而非对象。这个坑货！想想axios也很无辜....因为我们有时候可能真的会有需要返回字符串。所以写期望的返回数据时，别偷懒又允许json又允许text。也许只允许json就不会有这个问题了。（待验证） Reference
Permanent link to “离奇的axios返回数据：得到了一个JSON 字符串而不是一个JSON 对象。”
解决CentOS...

最近把一台CentOS7 虚拟机从Windows 10 的VMWare 迁移到 CentOS8 的VirtualBox上，结果不能启动，说找不到 root 和 swap。我猜测与 Host机器CPU架构不同有关，老机器是Intel芯片，新机器是 AMD CPU。解决方法也蛮简单，进Rescue模式， yum update 就会自动装上一个新鲜的符合条件的内核。然后再重新启动就好了。 Reference 如此搞一下之后，启动倒是启动起来了，但启动时总有一个出错信息“error failed to send host log ”，虽然不影响使用，但看着很不爽。万能的Google很快给出了答案，把显卡换成 VBoxVGA 就好了。Reference
Permanent link to “解决CentOS 虚拟机从VMWare station 迁移到VirtualBox 不能启动问题”
Jenkins 三言两语

三天小长假过完了。终于把 Jenkins 从windows 10 也迁到了那台 CentOS上，我对 Jenkins 的了解又深了一点点。 Jenkins 把所有的插件和用户数据都存一个目录里，这个设计非常赞。这让我得以专注于迁移我的流水线。让 Jenkins 运行在docker里，把运行docker的host机器做成一个新节点，很不错。我更喜欢声明式流水线....主要是对脚本式流水线更不熟悉，对 groove 语法也不熟悉，另外，也不很想在流水线里写复杂的逻辑。这俩谁都先进呢？说不准。我更看好声明式流水线。 agent和node之间的关系还是没有搞得特别清楚。时间紧，经理又催得急，先这么着吧。怕删错文件，删文件的地方没敢用环境变量，越来越胆小。哈，应该有更好的解决办法。 ssh从docker里连到宿主机....用key文件没有成功。尚且不知道原因，应该加个todo。
Permanent link to “Jenkins 三言两语”

May 2020

Ubuntu 20.04...

为啥用 fcitx 不用ibus呢.... 一开始我确实是用的ibus，但它老人家在 google doc 的网页里不显示候选文字框，等修复不知道要等到啥时候，我就扭头换 fcitx 了。现在是2020年了，网上的教程大都过时了。和 ibus-rime 一样，今天的 fcitx-rime 已经内置这个功能，只是它的默认配置没有配置这个功能。废话不说，贴上我的配置文件 ~/.config/fcitx/rime/default.custom.yaml 内容如下 patch: style: display_tray_icon: true horizental: false font_point: 14 schema_list: - schema: wubi_pinyin - schema: pinyin_simp ascii_composer/switch_key: Shift_R: commit_code Shift_L: commit_code ~/.config/fcitx/rime/wubi_pinyin.custom.yaml 内容如下： patch: switches: - name: ascii_mode reset: 0 states: [ "中文", "西文" ] - name: full_shape states: [ "半角", "全角" ] - name: simplification states: [ "汉字", "漢字" ] simplifier/opencc_config: s2t.json engine/filters: - simplifier - uniquifier 我在网上搜了半天，都没配成，灵机一动从我的 squarrel 输入法配置里直接把这俩文件 copy 过来，一部署结果就好了。
Permanent link to “Ubuntu 20.04 fcitx-rime wubin_pinyin 配置简入繁出”
What I have...

长叹一声。Linux 上就没有一个好用的远程桌面服务器。虽然不喜欢，留个 teamviewer 进程一直开着以应不时之需是有必要的。 vagrant 的 public_network 在 usb 无线网卡有bug...（服务器好好的千兆网卡你不用用什么无线网卡....不是手头没有网线嘛 "Ansible for DevOps" 据说是一本好书。那待读书单里就加一本吧 CentOS8内置了一个叫 cockpit 的web管理器，还挺好用的。它的端口是9090，咋改成用正儿把经的https证书我还不知道。 Gnome桌面有一个叫 Vinagre 的远程桌面客户端，支持的服务器类型挺多的。（然而并不好用）不应该把对应数据表的 entity model 直接用在 web API 里。别嫌麻烦，那个应该是贫血的，除了主键并不需要有其他的约束。把完整的表结构和所有字段暴露给客户端是不好的。 AutoMapper 有什么用？应该怎么用？，这篇09年的老文章和里面的评论可能会有点用。 chrome OS 开了开发者模式，按 ctrl + alt + -> root 登录即可设置默认用户的密码。想深入了解Linux了，所以又开始看 Linux From Scratch。
Permanent link to “What I have learnt in recent days”
Tailscale：不�...

Tailscale 丁宇在推特上说这个东东比 frp 好用。我先一口气把它安装到四台服务器性质的 Linux 机器上，包括两台本来就有外网 IP 的vps，然后才琢磨这东西有啥用，怎么用。安装和授权过程都很简洁，没有废话，第一印象棒极了。那...它有啥用呢？一句话，它把你所有的机器，不论物理上隔多远，放到一个局域网里了。在这个局域网里，没有防火墙，网内可以访问任何设备的任何端口。和普通的vpn不同，它没有中央设备，所有设备之间都是直连，因此性能比较好。那有啥用呢？管理你的一堆机器更方便了。局域网内任何一台有外网IP的机器都能做为任何一台内网机器的跳板机（内网无端口限制的穿透）。换言之，你的VPS只要有足够的流量，硬盘空间不再是限制你部署应用的瓶颈，你完全可以把你的各种试验性side project部署在你的家里，或者父母的家里，扔台旧机器装个Linux就全齐活了。嗯，它不光支持 Linux，还支持macOS，iOS，Windows！牛大了。记录一下小坑。macOS 10.15.4 安装好后 Login 是灰的，无法登录，重启下电脑就好了。
Permanent link to “Tailscale：不一样的VPN”
好香的接口�...

这是我从新近follow的一个推友 @tywtywtyw 的推文里拣到的宝。他在推文里说放弃了 postman 和 postwomen, 来到了 insomnia 能比 Postman 更好？这勾起了我的好奇心。结果发现真香。顺便说一下，他的口号是“Design and debug APIs like a human, not a robot.” 不用写脚本，可以指定当前请求依赖哪个请求，以及是使用缓存的请求结果，还是需要时再发新请求（通常我都会选择发新请求，毕竟token会过期）最重要的键是 Ctrl+空格。这是 autocomplete 的热键。界面相对易用。有父环境和子环境的概念，公共的东西写到父环境里，能省一些时间就像使用苹果的软件，你不需要专门保存你的接口，你写了，你run了，接口就自动存好了。遇到一个坑：如果是在JSON里使用环境变量，并且这个变量是个字符串，得用双引号括住这个变量！我已经决定扔掉 Postman 了。就是这么喜新厌旧。
Permanent link to “好香的接口测试工具：Insomnia Rest Client”
How to let...

It spent more than half an hour. Finally, I found this solution.... very simple! #!/bin/bash /usr/local/bin/noip2 -c /usr/local/etc/no-ip2.conf sleep 1 noip sucks! source
Permanent link to “How to let Supervisord wait 1 second before restarting my program?”
Database...

Two bash script achieved the goals in this subject. 1. Exporting data dictionary cat utils/exportDbDictionary if [ $# != 2 ] ; then echo "USAGE: $0 dbname tablename" echo " e.g.: $0 IDServer AspNetUsers" exit 1; fi document_path=/YourProjectName/documents/database [ -d $document_path/$1 ] || mkdir -p $document_path/$1 mysqlshow $1 $2 | sed 's/+/|/g' | sed '1,2d' | sed '$d' | awk -F"[|]" '{print $2"|"$3"|"$5"|"$6"|"$7"|"$10}' | sed 's/ *$//g' > $document_path/$1/$2.md People should always add comments to their field definitions. As soon as the definition of a table has been done, run this script could automatically generate a markdown table with the name of tableName.md. 2. export database structure without auto_incrment= statements cat utils/backupDbStructure backupFile=/YourProjectName/documents/database/databaseStructure.sql mysqldump -d --databases YourDB1 YourDB2 YourDB3 | sed 's/ AUTO_INCREMENT=[0-9]*//g' > $backupFile When you made some changes to your database, run backupDbStruture script will automatically generate the latest table structure into one file. You could commit it later with your code change together.
Permanent link to “Database structure backup & Data dictionary automatically generation”
.net core...

If the field names in your Model class are not exactly the same as in a JSON string, you will need adding an option to guarantee the behavior is what you want. For example, if you have got the following response text: {"hello":"world"} and you have a Model class below: class SampleModel { public string Hello { get; set; }; } You can see the property name in your Model class is "Hello" instead of "hello", the following code won't get an expecting result. SampleModel s = JsonSerializer.Deserialize<SampleModel>("{\"hello\":\"world\"}"); you will get an object like { "Hello": null } You have to use an option below to get it to work. SampleModel s = JsonSerializer.Deserialize<SampleModel>("{\"hello\":\"world\"}", new JsonSerializerOptions { PropertyNameCaseInsensitive = true, }); on the other hand, you have to use the following code to guarantee the serialize behavior: SampleModel s = JsonSerializer.Serialize(new SampleModel() {Hello="world"}, new JsonSerializerOptions { DictionaryKeyPolicy = JsonNamingPolicy.CamelCase }); Thus you get {"Hello":"world"} instead of {"hello":"world"}. System.text.json sucks.
Permanent link to “.net core System.text.json Serialize & Deserialize”
Permanent link to “Watched "St. Vincent (2014)"”

April 2020

Setting timezone for Linux system sudo timedatectl set-timezone Asia/Shanghai Setting timezone for MySQL add the line below to [mysqld] section in /etc/my.cnf default=time-zone = "+8:00"
Permanent link to “Setting timezone for Linux system”
Let your Linux...

$ sudo vim /etc/sysctl.conf add the line below to the end of this file: vm.swappiness = 10 save and exit. Execute $ sudo sysctl -p vm.swappiness = 10 means that the Linux system will only start using swap space when your available physical memory is less than 10%.
Permanent link to “Let your Linux system use memory as much as possible instead of swap space.”
Vmware CentOS...

今天天气不错，和太太儿子去 Bowenvale Walking Tracks 走了一个短途的hiking。回家路上前端同学报告说测试机出问题了，所有接口都不通了。于是到家赶紧排查问题。网络环境 Host：Windows 10，Vmware Station Guest: CentOS 7.7 Bridge network 一开始以为是服务进程崩了。连上vpn发现机器都ping不通。哦看来虚拟机是被谁关掉了。远程桌面到Host机器一看....虚拟机活得好好的，并没有被关掉。用控制台登录进去一看，发现IP不是我们以前设定的IP，而是变成 172.18.开头的一个地址，这是我们误以为网络不通了的原因。经过一番排查，发现故事应该是这样的： CentOS机器的网络配置是 DHCP，因为网络是桥接的，因此只需要路由器上做点设置，根据CentOS机器网卡的Mac地址总是分配 192.168.178.52 这个IP给虚拟机就行了。我查看了路由器的设置，发现确实是这么设置的，虚拟机网卡的mac地址也没有变，看上去一切都很正常。不过这里有一个小小的细节，一开始我没有在意，但它可能是问题发生的始作俑者。在登录公司路由器的时候，我没有直接进入设置界面，而是系统弹出一个提示框，说系统刚刚升级到某某版本，有一个引导界面走了好几步才进入路由器设置界面。我先是修改CentOS的网络设置，把网络参数由 dhcp 改成 static，确保他总是使用 192.168.178.52 这个IP，也设置了默认路由，重启网络，发现修改生效了，IP地址现在是正确的了，但是却不能上网，内外不通。那问题出在哪里呢？之前拿到的IP是172.18.x.x，这不是 Docker 喜欢用的IP段么？莫非和Docker 有关？我先是把 CentOS 虚拟机里的Docker 停掉....重启网络，依然固我。网还是不通。我只好把关注点移到 Host 机器，硬件网卡，VMnet1, VMnet8, vEthernet (Default Switch)..... 慢，这个vEthernet 是什么鬼？它的IP也是172.18.x.x的！网上搜索了一下，说这个东东应该是Docker添加的。对呀，我前几天刚好干过这个事情，在Windows 10 上安装了Docker，那时我是试图解决 Jenkin 不听话的问题。但因为这台Windows 10 主要是兄弟部门在用，怕Docker影响他们的业务，我的经理就赶紧把Docker卸掉了。 Docker都卸掉了，卸掉这个虚拟网络示配器料无大碍，于是我就尝试 uninstall it。系统提示发生了什么未知的错误，不让卸载。那就禁用它吧。禁用成功。再ping那个IP，网通了！回头想想，CentOS机器的IP并非无缘无故就变了，我猜测应该是路由器自动升级，在那个短暂离线期间，CentOS的网络被我刚刚禁用的那个虚拟switch抢先接管了。本来应该由路由器固定分配 192.168.178.52 给那台机器，但路由器短暂弃权期间，这个过程被那个虚拟的switch示配器干扰，于是CentOS得到一个 172.18 开头的IP。哎！Docker也真是的，你都已经被卸掉了，也不把自己带的东西清理干净。很有意思的排错过程，记录下。
Permanent link to “Vmware CentOS guest IP address automatically changed Isuse”
解决 ibus-rime...

我忍受这个问题已经有快一个月了，今天打算花点时间把它解决掉。经过一翻搜索，我发现已经有人在 ibus-rime 项目上报告了这个问题，也有人给出了解决方法。遗憾的是，那个解决方案有些含糊，我不知道需要对系统做哪些改变。也许从源码安装能够解决问题？但我一开始走了弯路，没有认真安装文档中提到的所有依赖，毫无疑问的，编译到中间就因为缺这缺那失败了。后面我就老老实实的按照文档说明，先安装好所有的依赖，再执行 ./install.sh。然而我仍然可耻的失败了。我不知道原因....也许应该报个bug给作者。幸运的是，源码里还有一个 install-static.sh 脚本，我执行了这个脚本，结果顺利编译成功并安装。现在我的五笔拼音也能够识别中英方式了（英文状态显示A，中文状态显示“五”），太开心了！我是 ubuntu 18.04 (pop!os) Gnome 3 桌面，五笔拼音输入法为方便同样用 ubuntu 18.04 的同学，我把编译前的准备工作和编译步骤列在下面： 1. 准备工作 sudo apt install cmake libboost-all-dev libibus-1.0-dev libnotify-dev libgoogle-glog-dev \ libkyotocabinet-dev libleveldb-dev libmarisa-dev libopencc-dev libyaml-cpp-dev 2. clone project and submodules: git clone --recursive https://github.com/rime/ibus-rime.git cd ibus-rime # do this as normal user ./install-static.sh 3. 重启 ibus ibus-damon -dxr Enjoy your favorite input method!
Permanent link to “解决 ibus-rime 在 ubuntu 18.04 下中英文切换图标无变化问题”
My favorite...

Awesome-Linux-Software Awesome-Linux-Software Chinese Currently, my laptop runs Pop! OS 18.04 (Ubuntu). Thanks my boss, he bought me a Windows laptop, so I have the chance to run Linux as my main OS. The following is a list of my favorite apps on my laptop. mp3 player: Audacious browser: Chromium Markdown editor: Typora Text editor: Geany Quick view: gnome-sushi Epub reader: Foliate Console Dictionary: sdcv Console tts: say (in gnustep-gui-runtime package) hardware information: inxi say alternative: gnustep-gui-runtime apt-get install -y audacious chromium typora geany gnome-sushi foliate sdcv gnustep-gui-runtime inxi 3rd software Jetbrains: Rider, Webstorm, Phpstorm, Pycharm Telegram-desktop will update the list when I remember... 😀
Permanent link to “My favorite applications on Ubuntu”
`git rm --cached...

There are 3 options, you probably want #3 This will keep the local file for you, but will delete it for anyone else when they pull. git rm --cached <file-name> or git rm -r --cached <folder-name> This is for optimization, like a folder with a large number of files, e.g. SDKs that probably won't ever change. It tells git to stop checking that huge folder every time for changes, locally, since it won't have any. The assume-unchanged index will be reset and file(s) overwritten if there are upstream changes to the file/folder (when you pull). git update-index --assume-unchanged <path-name> This is to tell git you want your own independent version of the file or folder. For instance, you don't want to overwrite (or delete) production/staging config files. git update-index --skip-worktree <path-name> It's important to know that git update-index will not propagate with git, and each user will have to run it independently.
Permanent link to “`git rm --cached ` is a worse choice than `git update-index --assume-unchanged `”
gnome3 how to alt...

gsettings set org.gnome.shell.app-switcher current-workspace-only true
Permanent link to “gnome3 how to alt tab windows on current workspace only?”
status code...

同事扔给我一张截图，显示errCode是5，说: 「已注册」的error code是5， errorCode 4开头的会到404页面， 5开头的会到505页面，我们之前有通过的都是200 我：不不不这个和 statusCode 是两码事儿 errCode 是业务错误代码 20x 40x 50x 是返回响应的状态码，通常是框架自动给的，若你的请求参数没有问题，系统通常都会返回状态码 200。但返回200并不意味着一切都对，在我们的项目中，状态码返回 200 并且 success 为 true 或者 errCode = 0才是真的没有问题同事：哦，是这样，所以我们还是有statusCode 我：如果参数根本不符合约定，系统会立即拒绝你，那时候statusCode 会是 40x 如果参数都对，但后端的代码出了bug造成服务器不能正常返回，response会报 50x 表示前端没错，但服务器那边出问题了。换言之如果是 20x，则你没错，我也没错，成功没有成功是业务逻辑的事情。如果是 40x 意味着前端送过来的数据不符合后端要求，因此没有被进一步处理，而是被直接拒绝了 50x 表示前端送过来的东西没有大问题，但后端没有处理好出错了同事：好的，那我明白了，我记错了，是statusCode才是指到505，404，我以为都改成了errCode 我：所以 errCode 5 一定不能一杆子指到 505 页面去。发现 50x 了去找后端工程师的麻烦一般不会错，如果 40x 了去找后端之前，最好先检查下自己的参数和出错信息同事：好我： status code 和 errCode 本质上是两个东西，errCode是返回数据的一部分 status code 是本次请求返回响应的状态码，可以理解为和返回数据是同一等级的同事：那我们的error.response的数据结构有改变吗，我现在还是可以抓取到error.response.status，说明这部分应该是没有改的我：这个是axios的约定，并不是后端能够决定的，我们结构的变化，只是response.data 结构的变化是 response.data 吧，我不是很确定，毕竟好久不写 axios 代码了同事：是的，但是后来有加了一个data, 我们现在的结构变成这样的 [ Photo ] 我：对。后端只给了一个data键，图里的第一个data是 axios给的，需要注意的是，不同的框架给返回数据的键取的名字可能会不一样。如果不用axios而是用别的库，数据那一级的键的名字就很有可能不叫 data 同事：嗯嗯话外音：我相信她这次真的搞明白了。哈。聊天记录稍加编辑就水了一篇博客，不过我相信它应该会对前端新人有所帮助。
Permanent link to “status code versus error code”
What I have...

I successfully ran macOS High Sierra on my Ubuntu 18.04 laptop through VirtualBox. VirtualBox is great ! This article helps! Install Rime on macOS in five minutes download the zip file from GitHub, and look at the README.md, you will find another address to download the latest binary release at https://bintray.com/rime/squirrel/release/_latestVersion download the binary version and install it. go to https://github.com/rime/plum to get the wubi package. git clone https://github.com/rime/plum.git cd plum bash rime-install wubi pinyin-simp The last step, is creating a default.custom.yaml file and putting it in ~/Library/Rime directory. the content in my default.custom.yaml is patch: schema_list: - schema: wubi_pinyin - schema: pinyin_simp
Permanent link to “What I have learnt on 12-03-2020”
How make openvpn...

I met this issue today morning and find the solution from the link I just refered. I have made a few change to the solution to meet my case, this is why I wrote this article. My version of fix-routes.sh #!/bin/sh echo "Adding custom route to $route_vpn_gateway with /24 mask..." # ip route add 10.8.0.0/24 via $route_vpn_gateway ip route add 192.168.178.0/24 via $route_vpn_gateway echo "Removing /1 routes..." ip route del 0.0.0.0/1 via $route_vpn_gateway ip route del 128.0.0.0/1 via $route_vpn_gateway I didn't use ip route add default via $route_vpn_gateway line because I didn't want to route everything through my VPN. Changes to my openvpn profile You can see I added an extra askpass line besides what the author has done. That line was added to help me get ride of the annoyance of entering the password for my private key every time I run the openvpn client program. auth SHA256 auth-nocache verb 3 askpass /home/davidwei/ovpn/pass.txt script-security 2 route-up /etc/openvpn/fix-routes.sh My ovpn start one-line script [email protected]:~$ cat ~/bin/ovpn sudo openvpn ~/shukebeta.ovpn > /dev/null 2>&1 & My pass.txt [email protected]:~$ cat ~/ovpn/pass.txt my-very-secret-password
Permanent link to “How make openvpn work with docker & avoid entering the password every time”
Notes for...

前言好几年前 123systems.net 打折的时候买了这个vps，年付只要 $3.8。不过配置还说得过去，256M 内存，10G ssd硬盘，每个月有512G流量，而且是 KVM的。那时候我还没不知道docker，买这台vps的目标也很单纯，就是翻墙。然而当时 123systems.net 的服务非常烂，网络差，北京连过去经常丢包不说，而且还常down机，你提个ticket也要过上好几天才有人搭理。便宜没好货....看在乞丐价的份上，所以大爷我也忍了。不就3块8么，全当喂狗了。（所以后面不久我又从另一家买了一台配置高点的）。后来听说 123systems 被另一家 vps 提供商（对，就是chicago vps）收购了，我想那服务是不是会好点，就又连上去试了下。别说，网络真的稳定多了！也几乎不down机了，于是它就作为我的一个备用翻墙节点用起来了。这也才有了后面的年年续费。在这台机器上我用了好几年 Ubuntu 14.04，但这台 vps 能够安装的操作系统模板，这么多年就一直没更新过。Ubuntu 最高是14.04， Centos是 6.5， Debian是7.3，Fedora 是 20。后来我玩 Docker 的时候想到这台机器是 kvm 啊，可以装docker的。于是就在上面装了Docker。后来随着 Docker 的一直升级，渐渐地新版 Docker 就不再支持 Ubuntu 14.04了。虽然用旧版也不是不行，但是我动了升级操作系统的念头。虽然模板中只有 14.04，我总可以自己升级装好的系统嘛。然而升级并不顺利，我曾经磕磕绊绊升到 16.04 用了几天，发现不稳定（经常无故自动关机）就又回到了 14.04。后来经过一个不眠之夜，我装上了 Debian 7 又费了好大劲升级到 Debian 8 jessie。这个还比较稳定，就一直用着，直到昨天晚上。昨天晚上闲逛的时候，我发现有一个人写了个一键自动重灌vps操作系统的脚本，支持 Debian 和 Centos，支持指定版本号。我的心又活络起来了。虽然那篇文间是2018年的，已经挺老了，但我还是打定主意打算试试，万一支持 Debian 10 呢。于是该备份的备份，然后开始尝试。不过作者说了不保证谁都能用，也不保证不丢数据。悲伤的是他说对了 Debian装上启动不了，Centos 看文章下面的评论最高只能升级到 6.10 而我的目标是 7.7。罢了罢了！此路不通！看看天色已晚，已过夜里12点。我打算再最后试一次，装个 Fedora 20 看看能不能一路升到最新。然而也不顺利。都1点了，去他的，睡觉了。心里有事，睡得也不踏实，于是今天早上早早就起来了。不想再用Ubuntu了，于是重新装上 Deiban 7，我想这次，就升级到 Deiban 8 和过去一样算了，回到原点凑付用吧。一台年付才3.8的破机器，不值当我花这么多时间折腾。然而 Debian 7 的源已经都死掉了，所以 Deiban 7 的系统也没法更新了，直接升 8 就好了。然而升 8 也不顺利，上次升级的时候并没有记笔记，所以好多问题东西要重新搜索，重新找（所以我今天在写笔记！）。就在到处找的过程中，我看到一个人在某个问题下评论说，他从 Debian 7 一直升级到了 Debian10，虽然花了很多时间，但感觉 amazing! 那我也试试唄。现在是中午12点，开心的是我也搞定了那个升级，并且正在趁热乎把中间找资料的坎坷记录下来。那么口水到此结束，下面干货开始：正文 Debian 7 更新 /etc/apt/sources.list 为 deb http://deb.debian.org/debian/ jessie main contrib non-free deb-src http://deb.debian.org/debian/ jessie main contrib non-free deb http://security.debian.org/ jessie/updates main contrib non-free deb-src http://security.debian.org/ jessie/updates main contrib non-free deb http://deb.debian.org/debian/ jessie-updates main contrib non-free deb-src http://deb.debian.org/debian/ jessie-updates main contrib non-free 用 root apt-get -y update apt-get -y install apt -t jessie apt -y upgrade apt-get -y dist-upgrade reboot 当然升级之路不会这么顺利，你肯定会遇到 no public key available for the following key IDs: xxxxx 和什么源已过期无法验证之类的报错。对于前者，使用 apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 1397BC53640DB551(请一定记着把key换成你那里看到的key)；至于后者，可以用加参数大法apt-get -y -o Acquire::Check-Valid-Until=false update 解决。总起来说这一步还是蛮顺利的，升级完重新启动能直接进系统，网络什么都是好的。 Jessie to Stretch，继续用root身份哦 sed -i 's/jessie/stretch/g' /etc/apt/sources.list apt-get update apt-get upgrade apt-get dist-upgrade 应该说这个升级也蛮顺利的，除了升级完重启后....我就再也连接不上vps之外。还好有 Vnc 可以用，虽然网页上提供的 html5 vnc cient不能使，但我用本机的 vncviewer 能够连接上。连上之后，发现除了网卡参数全丢了，其他都是正常的。那...网卡参数怎么设置？原来的参数都是啥？我不知道哇。于是又一通搜索，各种尝试，还是不行。最后想起 vps 控制台有 Reconfigure Networking 的功能，那就死马当活马医，试试吧。一试，好了！那么.....从7升到9已经是挺了不起的成就了，还升10么？升！ Stretch to Buster，继续用 root 身份 sed -i 's/stretch/buster/g' /etc/apt/sources.list apt-get update apt-get upgrade apt-get full-upgrade 这个升级也蛮顺利的，然而升级完重启后就连接不上vps的问题再一次发生了。根据刚才的经验用了 vps 控制台的 Reconfigure Networking 的功能，但这次没有那么走运，网还是不通。经过一番排查之后，发现这次系统注入参数时使用的网卡名字是 eth0，而我记得以前网卡的名字是 ens3。于是修改 /etc/network/interfaces 文件，把 eth0 改为 ens3 然后 systemctl start networking.service。成功！每一次折腾，都能学到点什么，技术就是这么一点点折腾来的。但是如果不记录下来，下次再找又要花很多时间。所以...我又花了40分钟写这篇blog。不过还是很开心啊！把看似不可能事情最终搞成了，就是那样的开心！参考资料: debian-wheezy-update-repository 参考资料: how-to-upgrade-debian-7-wheezy-to-10-buster-safely 参考资料: how-to-upgrade-debian-8-jessie-to-debian-9-stretch
Permanent link to “Notes for upgrading Debian 7 to Debian 10 on an old cheap VPS”
Permanent link to “Everything is hard before it is easy.”
x-www-form-urlenc...

This old blog has given a strong answer.
Permanent link to “x-www-form-urlencoded vs JSON, which one is better?”
How to get...

I haven't used my old MBP 13 for nearly a month. This evening I picked it up and opened the iTerm2 then connected to my home server through ssh. I noticed I get a white-black colored terminal. What's wrong? I remembered it was colorful when I logged into this machine last time using iTerm2 on my MBP 15. Firstly, I checked the version of iTerm2, it was a bit old, so I updated it first. Unfortunately, it doesn't help. I noticed I was using bash instead of zsh on this machine. So I ran chsh and changed the shell from bash to ssh. It also doesn't help. Then I find this answer from stackoverflow.com. A comment in this answer reminded me: I should check and compare the terminal configuration in iTerm2. So I found the secret! Command + , open the preference, then click the profiles tab, then change the Report terminal type from xterm to xterm-256 color, that's it!
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Permanent link to “麻雀”
Permanent link to “Watched "WALL-E"”
夏时制即将�...

这是我对看新西兰站长所发文章「4月5日星期天凌晨3点新西兰夏令时结束」的评论。这意味着对那些不记录 unix 时间戳而只记录本地时间的系统，如果他们依赖时间排序（因为没有时间戳）的话，夜里2点-3点钟的记录会是紊乱的，因为这段时间会过两遍。显示上看起来没有问题的数据，其实是偏离真实顺序的。比如一篇文章的两个评论，明明是后面的评论回复前面的评论，即可能现回复的评论先显示，然后才显示被回复的评论这种“怪事”。当然了，如果用unix时间戳排序会有另一种问题，数据的顺序是正确的，但显示的本地时间却是紊乱的。可能出现显示一个人在 2:45 分发表了一篇评论，但另一个人却“使用了月光宝盒”回到 2:15 分回复 2:45 分评论的“怪事”。站长说的对，人们应该调整自己的作息时间，而不是调快或调慢计划仪器。但站长说的又是错的，因为人是愚蠢的动物，自律的人是那么的少，如果依赖们自己调整作息时间，节能效果就会大打折扣。所以“调快调慢”计时设备这个看上去错误的解决方案，即又是最管用的方案。世界就是这么奇妙！
Permanent link to “夏时制即将结束所思所想”
We learn from...

We learn from history that we do not learn from history.
Permanent link to “We learn from history that we do not learn from history.”
Defining arrow...

Today I was caught by a bug. I got an error message like "Uncaught (in promise) TypeError: Cannot set property 'users' of undefined" in the following code: import axios from 'axios'; export default { name: "Users", data() { return { users: null }; }, created: () => { axios .get('https://jsonplaceholder.typicode.com/users') .then(res => { this.users = res.data; }) } } Finally, I figured it out by changing the created method definition from an arrow function to a normal function, the following is the correct code: import axios from 'axios'; export default { name: "Users", data() { return { users: null }; }, created() { axios .get('https://jsonplaceholder.typicode.com/users') .then(res => { this.users = res.data; }) } } Do you see the difference?
Permanent link to “Defining arrow functions at a wrong place caused *this* object becoming undefined.”
Programming Tips...

safely convert Unix TimeStamp to string : DateTimeOffset.UtcNow.ToUnixTimeSeconds().ToString(CultureInfo.InvariantCulture.NumberFormat) source DI with parameters in constructor services.AddScoped<SmsSentLogRepo>(s => new SmsSentLogRepo(Configuration.GetConnectionString("sms"))); You should use ConfigureAwait(false) in your library code. source
Permanent link to “Programming Tips on 01-04-2020”
Permanent link to “观影老电影《牧马人》”

March 2020

客户端 POST...

刚好今天和一个同事在这个问题上意见不一。于是翻到了知乎上的这个问题，遗憾的是下面的答案都很水，没有一个深得我心。这很有可能证明我的看法是片面的，管它呢。但它激起了我的表达欲望，我于是键盘侠了下面这一篇。刚好傻子知乎嫌弃我没有认证国内手机号，不让我发表。那我就给自己的 Blog 添块砖吧。其实这个标题蛮误导人。Post 错误....这种表述再宽泛了。因此有人支持有人反对都不奇怪。多么 Bad 的 Request 算Post错误？每个人有每个人的出发点，这太难达成一致了。我的观点缩成一句话，只要请求使用 Api 协议（参数个数类型都）正确，我接受甚至有点喜欢响应 200 OK 再给出具体的 ErrorCode 和 ErrorMessage 这种做法。既然请求能抵达你的 Action 处理方法，至少说明发起请求的一方是有一点点诚意的。如果你再有一点点时间，即使请求不是十全十美，给个不等于0的ErrorCode和一个合理的ErrorMessage是一种绅士的做法。如果请求格式合法，服务器能够理解，但不能给出满意的结果，或者说 errorCode 不是0的情况，我个人的实践的是返回 200，并给出具体的错误码和错误信息。理由是这个请求不是无效的和非法的，直接扔400 是给前端增加工作量。即使现在在的框架已经内置了 NotFound() 之类的快捷响应办法，但只要Route正确到达了我的处理方法，而我又不想偷懒，我的观点也是应尽量给出人类能够理解的出错信息。你总不能因为商品暂时缺货就直接甩404吧！我不赞成甚至讨厌那些把2xx - 5xx那几十个code 一个个或合理或牵强附会的对号入座，毕竟发明大部分这些Code 的时候还根本没有 Restful 概念。它们都过于宽泛了，是给喜欢偷懒和甩锅的程序员们准备的。即使你使用的前端框架能够自动帮你处理这些code，广泛而大量的使用这些code也只会降低用户的体验而不是改善用户的体验。因为最终用户大部分时候都只能知道错了，但不知道错在哪里。当然是很个人的看法，欢迎任意批判。
Permanent link to “客户端 POST 错误，服务端应该回 200 还是 400？”
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微生物的力量

微生物的力量
Permanent link to “微生物的力量”
Install...

The Vps is too old to get a newer OS from the provider. create /etc/apt/sources.list.d/jessie-backports.list, and fill in the following lines deb http://archive.debian.org/debian jessie-backports main deb http://archive.debian.org/debian jessie-backports-sloppy main apt-get update -o Acquire::Check-Valid-Until=false apt-get install shadowsocks-libev the -o Acquire::Check-Valid-Until=false is the key information. Hope it is helpful. source
Permanent link to “Install Shadowsocks-libev on Debian 8 (Jessie)”
what I learnt...

1. Use axel instead of wget $ sudo apt install axel axel -n 1000 url 2. Using Nginx as a file server https://www.yanxurui.cc/posts/server/2017-03-21-NGINX-as-a-file-server/ 3. Using supervisor and autossh to keep a tunnel being alive all time [program:autossh] command=autossh -M0 -N -o "ExitOnForwardFailure yes" -o "ServerAliveInterval 15" -o "ServerAliveCountMax 4" -o "ControlPath none" -o "UserKnownHostsFile=/dev/null" -o StrictHostKeyChecking=no -R 18022:localhost:22 -R 18080:localhost:80 -R 18443:localhost:443 [email protected]_ip_or_domain autostart=true autorestart=true startretries=999 redirect_stderr=true stdout_logfile = /var/log/supervisor/autossh.log stdout_logfile_maxbytes = 10MB source 4. Using shadowsocks + polipo to implement http/https proxy in Ubuntu 18.04 Guide in English 中文指南 How to avoid conflicts between dnsmasq and systemd-resolved? 5. Show System Info / Hardware Details on the Command Line (Ubuntu) $ sudo apt install inxi $ inxi -F Guide
Permanent link to “what I learnt 29-03-2020”
Install Debian 10...

I bought a VPS from http://virmach.com five years ago. It had been running Ubuntu 14.04 OS for over five years. It was stable but a bit out-of-date. Firstly I tried the Ubuntu 18 template, which was builtin by the cheap Vps provider (virmach). Unfortunately, I cannot log into the system after the OS installation, it always automatically refused my ssh connection, and continuously told me my password is wrong through the HTML5 vnc console. It's already very late yesterday evening, I was tired and wanted to give up. Then I found the Debian 10 Server X64 ISO file on the cdrom TAB. I love Debian, so I decided give it a go before going to bed. That's a very familiar and happy process. I just want to record the main steps of the process as a memo. Here it is mount the ios file you needed setup the boot sequence to CDROM first reboot your VPS and open the HTML vnc pannel Install the OS setup the boot sequence to HDD only Reboot
Permanent link to “Install Debian 10 by an ISO file on VPS”
Shadowsocks for...

“把文档写详细点会死吗？” 大概率会吧。虽然我来写未必会更好，但我还是要批评 ShadowsocksX-NG 还是 Shadowsocks for windows 的项目的 README.md 文件。起因：我妹夫访问我的翻墙服务器实在是太脏话慢了。虽然我这会身在墙外，然而身为墙国人，祖国总会给机会锤炼你的翻墙技术。所以，本着药不能停的原则，我又拣起了高速翻墙的技能。下面是我最后成功完成配置的具体步骤。在你的服务器上搭好 Shadowsocks 和 Kcp server。去 shadowsocks/windows 下载最新版，并解压缩到你打算放置的地方，比如 Desktop\shadowsocks。去这里下载Kcptun 最新版，把解压出来的 client_windows_amd64.exe 放到刚才放置 shadowsocks.exe 文件的同一文件夹。配置shadowsocks 假定你的shadowsocks配置是： { "server":"0.0.0.0", "server_port":8964, "local_port":1080, "password":"your-secure-password", "timeout":60, "method":"chacha20-ietf-poly1305" } 假定你的 Kcptun server 配置是： ./server_linux_amd64 -t 127.0.0.1:8964 -l :28964 -mode fast3 -key chrd5 -sockbuf 16777217 -nocomp -dscp 46 -crypt none 则你的Shadowsocks for windows 需要如下配置： Server IP: your-server-ip-or-domain Server Port: 28964 Password: your-secure-password Encryption: chacha20-ietf-poly1305 Plugin Program: client_windows_amd64.exe Plugin Opts: [v] Need Plugin Argument Plugin Arguments: -l %SS_LOCAL_HOST%:%SS_LOCAL_PORT% -r %SS_REMOTE_HOST%:%SS_REMOTE_PORT% -key chrd5 -crypt none -mode fast3 -nocomp Remarks: AnythingYouLike 注意事项 Server Port 是 Kcptun 监听端口，不是 Shadowsocks 监听端口 Plugin Program 那里填 client_windows_amd64.exe 文件的相对或绝对路径文件名。我上面让你把解压出来的文件扔到 shadowsocks.exe 同一文件夹，就是这里填写文件。 Plugin arguments 所有参数前缀都是一个 - 字符，网上有些教程会写成 --，这可能是个坑。就这样。希望也能帮到你。如果你遇到了麻烦，不要客气也不要担心自己的问题幼稚，欢迎留言给我，只要我及时看到并有空，就会帮忙。
Permanent link to “Shadowsocks for Windows Kcptun 插件配置指南”
Guide for...

There's little information on internet about configuring the Kcptun plugin for ShadowsocksX-NG. It is necessary to write a blog to record the process that how I configured it. It should be helpful for myself later, and for the others who need it. Let's start. Download the latest ShadowsocksX-NG release and install it on your macOS, it is the easiest step. You won't meet any problems at this stage. The following are samples for shadowsock server configuration and Kcptun server configuration: Sample for the shadowsocks-libev config.json { "server":"0.0.0.0", "server_port":8964, "local_port":1080, "password":"your-secure-password", "timeout":60, "method":"chacha20-ietf-poly1305" } Sample for the Kcptun server configuration ./server_linux_amd64 -t 127.0.0.1:8964 -l :28964 -mode fast3 -key chrd5 -sockbuf 16777217 -nocomp -dscp 46 -crypt none Your configuration may be different from the samples, it doesn't matter. The configuration details Address: your-server-ip-or-domain Port: 28964 Encryption: chacha20-ietf-poly1305 Password: your-secure-password Plugin: kcptun Plugin Opts: key=chrd5;crypt=none;mode=fast3;sockbuf=16777217;nocomp;dscp=46 Remarks: AnythingYouLike What you need to pay attention to in the upper configuration: The Port should be the Port that your Kcptun server is listening, not the port that your Shadowsocks server is listening. Fro the Plugin Opts, you don't need to specify any IP or Port parameters. You don't need to download the kcptun plugin by yourself, because it is builtin in latest release. That's all.
Permanent link to “Guide for ShadowsocksX-NG with kcptun plugin configuration”
dotnet-ef summary

Instal dotnet-ef dotnet tool install -g dotnet-ef --version 3.1.1 Add Migration dotnet-ef migrations add migration-name [-c SomeDbContext] Update Database dotnet-ef update database [migration-name] [-c SomeDbContext] Revert All Database Update dotnet-ef update database 0 [-c SomeDbContext]
Permanent link to “dotnet-ef summary”
Windows is still...

I would like to give Windows 10 a try after the promise 12 years ago. I got a job a month ago, and I need to write ASP.NET Core application for this job. Though Asp.NET core and C# taste good, windows 10 makes me upset once more. Twelve years ago, that was the year 2008, I left windows XP for Arch Linux. I promised I will never use Windows as my main OS in the future at that time. My boss bought me an excellent DELL laptop with 32GB memory and equipped a 15" 4k screen. Yes, it is preinstalled with Windows 10 Professional. Today I have installed autojump, Wrox on windows 10, and changed a few settings here and there to reach my requirements. I know I may insist on Windows for a bit long time because I need the job to live and I should give Windows another go. I hope I can feel better later. The Windows 10 system does improve a lot than its previous version, however, the feeling, I cannot tell. Another long way to go, or it may never be perfect. Good luck to me, and to windows.
Permanent link to “Windows is still a buggy and uncomfortable OS in 2020”
Windows 10...

去 https://rime.im/ 下载安装右键点击“中”字图标，在弹出菜单中点击“输入法设定” 在弹出窗口中点击“获取更多输入方案”，这时会弹出一个 cmd 窗口让你输入需要添加的方案先输入 rime-wubi 回车，wubi就自动装上了再输入 rime-pinyin-simp 回车，拼音也装上了。回车并随手关掉这个 cmd 窗口，加输入法的工作就完成了。回到刚才点击 “获取更多输入方案” 的窗口，勾掉你不需要的那些七七八八的输入法，选中刚刚添加上的“五笔拼音”，然后再点一下 “中”按钮（不是右下角的“中”图标），选择一个你喜欢的风格。 Mission Accomplished! Enjoy 你的五笔拼音吧！（By the way，写此Blog时我用的小狼毫版本是 0.14.3 ）
Permanent link to “Windows 10 小狼毫（RIME）安装五笔拼音输入法”
CentOS 7...

[[email protected] ~]# firewall-cmd --permanent --add-port=100/tcp success [[email protected] ~]# firewall-cmd --reload success From how-to-open-a-port-in-centos-7-with-firewalld
Permanent link to “CentOS 7 firewall-cmd open a port permanently”
Tips for dotnet...

On the Windows platform, the secrets file are saved at /Users/yourusername/%APPDATA%/Microsoft/UserSecrets/{projectid}/secrets.json; On Linux/Mac platform, the secrets file are saved at ~/.microsfot/usersecrets/{projectid}/secrets.json. Believe it or not, .NET Core console application doesn't support user secrets in its default configuration. You can use dotnet command set or list your secrets, but actually, you cannot get its value through the IConfiguration object. What's a shame! Finally, you may want to import secrets from one project to another project. I just wrote a small single-file script to save myself. Certainly, you can also use it if you like. The tool has been published on Github, here it is.
Permanent link to “Tips for dotnet user-secrets”
SSH Config Tips:...

Suppose you have a local laptop without a public IP named A (192.168.1.7) and a remote server that has a public IP name named B (172.16.0.77) and another remote server C (172.16.0.78) which is in the same LAN with B. You can connect to B directly by ssh, and you cannot connect to C directly because C doesn't have an external IP address. You want to map port 5001 on A to the same port on B to make you local service temporarily public)， you should add this line in laptop A's .ssh/config file: RemoteForward 5001 localhost:5001 #here localhost refers to A You want to map port 3306 on Host B (Remote machine) to the 3306 port on Host A (your laptop), you should add this line in laptop A's .ssh/config file: LocalForward 3306 localhost:3306 # here localhost refers to B You want to map port 22 on machine C to the 8045 port on A, add this line: LocalFoward 8045 172.16.0.78:22 Finally, the following code shows the final configuration in your ~/.ssh/config file Host B HostName b.somedomain.com Port 22 RemoteForward 5001 localhost:5001 LocalForward 3306 localhost:3306 LocalForward 8045 172.16.0.78:22 Thus, after you get connected with Host B through this config file, You can tell your friends or colleague to visit your local website by visiting http://b.somedomain.com:5001. You can get connected to Host C directly by running ssh -p 8045 [email protected] command. You can also directly visit the locally deployed MySQL service on Host B by connecting your local laptop's 3306 port.
Permanent link to “SSH Config Tips: RemoteFoward and LocalForward”
Methods for...

[HttpPost] public IActionResult Fill([FromBody] dynamic data) { string amount = data.amount.GetString(); } [HttpPost] public IActionResult Fill() { string dataStr = new StreamReader(Request.Body, Encoding.UTF8).ReadToEnd(); var data = JObject.Parse(dataStr); string amount = data.value.amount; } [HttpPost] public IActionResult Fill([FromBody] YourType data) { string amount = data.amount; }
Permanent link to “Methods for receiving JSON data in an Asp.NET core Controller”
First post

I just finished the installation for the Chryp lite blog system. I met a small issue related to its compatibility with MySQL version 8 but I managed to resolve it. Happy! The issue is that "groups" word has become a reserved keyword in MySQL 8.x, and unfortunately, there's a table in this blog system named "groups" too. I first tried to use "``" to encapsulate the table name and I failed quickly because there are too many places using the table name. Fortunately, the install program supports me to add a table prefix for all tables. So it was resolved by simply adding a table prefix! Happy!
Permanent link to “First post”

July 2020

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微生物的力量

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dotnet-ef summary

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First post