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linux查看httpd进程数

ps -ef | grep httpd | wc -l

查看Apache的并发请求数及其TCP连接状态

netstat -n | awk '/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}'

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kubernetes 下运行 dubbo 服务方案总结

目前 kubernetes 还没有提供“随机端口”的特性，所以实现起来比较麻烦。

下面前 2 种方案主要考虑的场景是 dubbo 运行在 kubernetes 集群中，但是也希望 kubernetes 集群“外”的应用也能使用这些 dubbo 服务。

实现原理：

• dubbo 已经提供了 2 个环境变量： DUBBO_IP_TO_REGISTRY、DUBBO_PORT_TO_REGISTRY 分别表示服务注册到注册中心的 IP 和 PORT。

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#!/bin/bash
# bash generate random alphanumeric string
#

# bash generate random 32 character alphanumeric string (upper and lowercase) and 
NEW_UUID=$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1)

# bash generate random 32 character alphanumeric string (lowercase only)
cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1

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详细问题见文档末尾

Never touch your local /etc/hosts file in OS X again

NOTE this has been done properly by a guy here: https://www.stevenrombauts.be/2018/01/use-dnsmasq-instead-of-etc-hosts/

You should go and do that now, ignore all of this.

To setup your computer to work with *.dev domains, e.g. project.dev, awesome.dev and so on, without having to add to your hosts file each time.

Requirements

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#!/bin/bash

## TODO:
# Figure out how to get nginx file-aio module working (incompatible?)

## Get and install tools and dependencies
sudo apt-get -y install build-essential zlib1g-dev libpcre3 libpcre3-dev libbz2-dev

## Get installed OpenSSL version
# Use `whereis openssl` to check if installed first