Nginx 使用总结

 一、使用 nginx 实现 灰度发布  

灰度发布，现在是很多大项目的一个标配运维特性，我们可以将一个“新的版本代码”发布到集群中的少数几台（组）机器上，以便引入线上少量真实用

户进行测试，用于验证产品改进的收益、小规模试错等。nginx提供了“nginx_http_split_clients_module”、“nginx_stream_split_clients_module”，

分别适用于http和tcp，可以帮助我们简单实现这些功能。

http {
    split_clients "${remote_addr}AAA" $variant {
                   0.5%               .one;
                   2.0%               .two;
                   *                  "";
    }

    server {
        location / {
            index index${variant}.html;
　　　　　　

二、工作进程数设置

# 总核数 = 物理CPU个数 X 每颗物理CPU的核数

# 总逻辑CPU数 = 物理CPU个数 X 每颗物理CPU的核数 X 超线程数

# 查看物理CPU个数

cat /proc/cpuinfo| grep "physical id"| sort| uniq| wc -l

# 查看每个物理CPU中core的个数(即核数)

cat /proc/cpuinfo| grep "cpu cores"| uniq

# 查看逻辑CPU的个数

cat /proc/cpuinfo| grep "processor"| wc -l

Binds worker processes to the sets of CPUs. Each CPU set is represented by a bitmask of allowed CPUs.

There should be a separate set defined for each of the worker processes.

By default, worker processes are not bound to any specific CPUs.

For example,

worker_processes    4;
worker_cpu_affinity 0001 0010 0100 1000;

binds each worker process to a separate CPU, while

worker_processes    2;
worker_cpu_affinity 0101 1010;

binds the first worker process to CPU0/CPU2, and the second worker process to CPU1/CPU3. The second example is suitable for hyper-threading.

The special value auto (1.9.10) allows binding worker processes automatically to available CPUs:

worker_processes auto;
worker_cpu_affinity auto;

The optional mask parameter can be used to limit the CPUs available for automatic binding:

worker_cpu_affinity auto 01010101;