An easy way to identify virtualization technology

An easy way to identify virtualization technology dmidecode -s system-product-name Virtualization technology VMware Workstation root@router:~# dmidecode -s system-product-name VMware Virtual Platform VirtualBox root@router:~# dmidecode -s system-product-name VirtualBox QEMU and KVM root@router:~# dmidecode -s system-product-name KVM QEMU (emulation) root@router:~# dmidecode -s system-product-name Bochs Microsoft Virtual PC root@router:~# dmidecode | egrep -i 'manufacturer|product' Manufacturer: Microsoft Corporation Product Name: Virtual Machine Virtuozzo root@router:~# dmidecode /dev/mem: Permission denied en root@router:~# dmidecode | grep -i domU Product Name: HVM domU /dev/disk/by-id If you do not have permission to run dmidecode, you can use: ls -1 /dev/disk/by-id/

[Share] Keychain - Pendant from a Type 57 rifle bayonet scabbard

[Share] Keychain - Pendant from a Type 57 rifle bayonet scabbard

SSH certificate login guide

SSH certificate login guide Certificate login flow Before using SSH certificate login, you need to generate certificates. The steps are: The user and the server both send their public keys to the CA. The CA uses the server public key to generate a server certificate and sends it to the server. The CA uses the user public key to generate a user certificate and sends it to the user. Once certificates are in place, the user can log in. SSH handles the whole process automatically.

How to capture web pages and long screenshots with Chrome DevTools?

How to capture web pages and long screenshots with Chrome DevTools? Open Chrome DevTools Click more_vert in the top-right, then choose filter_none to make it a separate window Ctrl + Shift + P(Command + Shift + P) Type screenshot Capture area screenshot: area screenshot. After selecting it, your cursor changes to add. Use it to select an area on the page. Capture full size screenshot: long screenshot. It completes automatically after about one second. Capture node screenshot: node screenshot. Similar to a long screenshot, but only visible parts are captured and the rest is blank. Capture screenshot: normal screenshot. It captures the visible page. If DevTools is not in a separate window, the result is affected.

BIRD and BGP: a beginner's kickoff

BIRD and BGP: a beginner’s kickoff BIRD Internet Routing Daemon

Introduction to Git internals

Introduction to Git internals

Using Python for multimedia: video, audio, and images

Using Python for multimedia: video, audio, and images

Aliyun CDN Cache Rules

Abount Ansible Hosts

# hosts 可以這樣寫 $ ansible 'max-compute[!3:9][0:3][0:3]' -m setup --list-hosts hosts (4): max-compute10 max-compute13 max-compute20 max-compute23 $ ansible 'max-compute[!3:9][0:4][0:4]' -m setup --list-hosts hosts (3): max-compute10 max-compute14 max-compute20 $ ansible 'max-compute[!0:3]' -m setup --list-hosts hosts (6): max-compute4 max-compute5 max-compute6 max-compute7 max-compute8 max-compute9 plugin: gcp_compute projects: - project-XXX zones: - asia-east1-a - asia-east1-c - asia-east1-b - asia-east2-a - asia-east2-c - asia-east2-b auth_kind: serviceaccount service_account_file: /root/.ssh/sa001.json filters: - status="RUNNING" hostnames: - name groups: nginx: "'nginx' in name" cassandra: "'cassandra' in name" redis: "'redis' in name" misc: "name in ('noc', 'mt-center')" prod: "'prod' in name and 'gke' not in name" all: "'gke' not in name" search: "'search' in name" cht_domain: "{{ 'web.qat.cht' if ansible_default_ipv4['network'] == '192.168.40.0' else 'ap.qat.cht' if ansible_default_ipv4['network'] == '192.168.50.0' else 'db.qat.cht' if ansible_default_ipv4['network'] == '192.168.60.0' else 'qat.cht' }}"

nginx 添加第三方nginx_upstream_check_module 模块实现健康状态检测

nginx 添加第三方 nginx_upstream_check_module 模块实现健康状态检测 nginx_upstream_check_module Health check HTTP servers inside an upstream nginx.conf http { upstream cluster { # simple round-robin server 192.168.0.1:80; server 192.168.0.2:80; check interval=5000 rise=1 fall=3 timeout=4000; #check interval=3000 rise=2 fall=5 timeout=1000 type=ssl_hello; #check interval=3000 rise=2 fall=5 timeout=1000 type=http; #check_http_send "HEAD / HTTP/1.0\r\n\r\n"; #check_http_expect_alive http_2xx http_3xx; } ... check syntax: *check interval=milliseconds [fall=count] [rise=count] [timeout=milliseconds] [default_down=true|false] [type=tcp|http|ssl_hello|mysql|ajp|fastcgi]* 默认配置：interval=3000 fall=5 rise=2 timeout=1000 default_down=true type=tcp* ... interval： 检测间隔 3 秒 fall: 连续检测失败次数 5 次时，认定 relaserver is down rise: 连续检测成功 2 次时，认定 relaserver is up timeout: 超时 1 秒 default_down: 初始状态为 down,只有检测通过后才为 up type: 检测类型方式 tcp tcp :tcp 套接字,不建议使用，后端业务未 100%启动完成,前端已经放开访问的情况 ssl_hello： 发送 hello 报文并接收 relaserver 返回的 hello 报文 http: 自定义发送一个请求，判断上游 relaserver 接收并处理 mysql: 连接到 mysql 服务器，判断上游 relaserver 是否还存在 ajp: 发送 AJP Cping 数据包，接收并解析 AJP Cpong 响应以诊断上游 relaserver 是否还存活(AJP tomcat 内置的一种协议) fastcgi: php 程序是否存活 example

CS Visualized: Useful Git Commands

CS Visualized: Useful Git Commands

string field was converted to True (type string)

string field was converted to True (type string) Unauthorized name in RAKP2 Failed to start poweroff connection timed out