使用nginx實現tcp/udp排程器功能，實現如下功能：
udp 協議是應用層：http dns nginx
tcp 協議是傳輸層
使用4臺rhel7虛擬機器，其中一台作為nginx**伺服器，該伺服器需要配置兩塊網絡卡，ip位址分別為192.168.4.5和192.168.2.5，兩台ssh伺服器ip位址分別為192.168.2.100和192.168.2.200。客戶端測試主機ip位址為192.168.4.100。如圖-2所示。
部署nginx伺服器：
[root@proxy conf]# nginx -s stop
[root@proxy conf]# rm -rf /usr/local/nginx/
[root@proxy nginx-1.12.2]# ./configure --user=nginx --group=nginx --with-http_ssl_module --with-stream //開啟ssl加密功能
//開啟4層反向**功能
[root@proxy nginx-1.12.2]# make && make install //編譯並安裝
修改配置檔案：必須在http上面
客戶端訪問：
[root@clent ~]# ssh 192.168.4.5 -p 12345
[email protected]'s password:
last login: tue jul 31 18:59:12 2018 from 192.168.2.254
[root@web2 ~]# connection to 192.168.4.5 closed by remote host.
connection to 192.168.4.5 closed.
[root@clent ~]# ssh 192.168.4.5 -p 12345
[email protected]'s password:
last login: tue jul 31 18:58:57 2018 from 192.168.2.254
[root@web1 ~]# connection to 192.168.4.5 closed by remote host.
connection to 192.168.4.5 closed.
優化nginx併發量
[root@proxy ~]# ab -n 2000 -c 2000
this is apachebench, version 2.3
licensed to the apache software foundation,
benchmarking 192.168.4.5 (be patient) ////提示開啟檔案數量過多
socket: too many open files (24)
2）修改nginx配置檔案，增加併發量
[root@proxy ~]# vim /usr/local/nginx/conf/nginx.conf
worker_processes 2; //與cpu核心數量一致
events {
worker_connections 65535; //每個worker最大併發連線數
use epoll;
2.優化linux核心引數（最大檔案數量）
[root@proxy ~]# ulimit -a //檢視所有屬性值
[root@proxy ~]# ulimit -hn 100000 //設定硬限制（臨時規則）
[root@proxy ~]# ulimit -sn 100000 //設定軟限制（臨時規則）
[root@proxy ~]# vim /etc/security/limits.conf
4）優化後測試伺服器併發量（因為客戶端沒調核心引數，所以在proxy測試）
[root@proxy ~]# ab -n 2000 -c 2000
this is apachebench, version 2.3
licensed to the apache software foundation,
benchmarking 192.168.4.5 (be patient)
completed 200 requests
completed 400 requests
completed 600 requests
completed 800 requests
completed 1000 requests
completed 1200 requests
completed 1400 requests
completed 1600 requests
completed 1800 requests
completed 2000 requests
finished 2000 requests
server software: nginx/1.12.2
server hostname: 192.168.4.5
server port: 80
document path: /
document length: 612 bytes
concurrency level: 2000
time taken for tests: 0.298 seconds
complete requests: 2000
failed requests: 0
write errors: 0
total transferred: 1690000 bytes
html transferred: 1224000 bytes
requests per second: 6715.42 [#/sec] (mean)
time per request: 297.822 [ms] (mean)
time per request: 0.149 [ms] (mean, across all concurrent requests)
transfer rate: 5541.53 [kbytes/sec] received
connection times (ms)
min mean[+/-sd] median max
connect: 0 13 15.5 4 55
processing: 2 14 11.9 8 202
waiting: 0 10 9.8 5 202
total: 5 27 24.3 12 215
percentage of the requests served within a certain time (ms)
50% 12
66% 31
75% 53
80% 56
90% 65
95% 70
98% 73
99% 74
100% 215 (longest request)
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