之前帮同学做的一个简单的图片保存访问和管理网站，昨晚他说访问很慢，然后登陆后台服务器用netstat查看
[root@iZ2832m5qa1Z ~]# netstat | grep ESTABLISHED
tcp 0 15840 iZ2832m5qa1Z:http 70.146.93.117.bro:52017 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 115.173.87.59:51486 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 115.173.87.59:51484 ESTABLISHED
tcp 0 17520 iZ2832m5qa1Z:http 33.25.164.222.sta:49385 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 180.165.67.91:64912 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 117.139.14.90:23150 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 139.205.81.137:18076 ESTABLISHED
tcp 0 20440 iZ2832m5qa1Z:http KD182251243016.au:41106 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 42.84.222.165:49941 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http pppoe214.net213.o:56491 ESTABLISHED
tcp 0 10880 iZ2832m5qa1Z:http 103.30.98.234:59365 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 42.84.222.165:49938 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http pw126253225030.6.:61449 ESTABLISHED
tcp 0 14520 iZ2832m5qa1Z:http 183.208.245.224:50679 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 182.41.29.245:55637 ESTABLISHED
tcp 0 14000 iZ2832m5qa1Z:http 117.136.16.105:12603 ESTABLISHED
tcp 0 9685 iZ2832m5qa1Z:http 61.159.21.88:52751 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 118.123.72.35:27057 ESTABLISHED
tcp 0 15400 iZ2832m5qa1Z:http 117.136.16.105:12602 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 70.146.93.117.bro:52014 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http hn.kd.ny.adsl:5527 ESTABLISHED
tcp 0 5184 iZ2832m5qa1Z:ssh 157.61.153.165:64214 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http hn.kd.ny.adsl:5526 ESTABLISHED
tcp 0 14000 iZ2832m5qa1Z:http 27.211.243.243:45558 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 117.139.14.90:23149 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 27.8.105.143:50135 ESTABLISHED
tcp 0 5503 iZ2832m5qa1Z:http 113.89.36.247:10958 ESTABLISHED
tcp 0 15840 iZ2832m5qa1Z:http 113.89.36.247:10957 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 61.159.21.88:52750 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 114.85.101.145:13878 ESTABLISHED
tcp 0 17280 iZ2832m5qa1Z:http pppoe214.net213.o:53090 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 36.5.27.214:16960 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 113.143.49.201:58216 ESTABLISHED
tcp 0 5045 iZ2832m5qa1Z:http 103.40.223.36:52853 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 113.89.36.247:10954 ESTABLISHED
tcp 0 18200 iZ2832m5qa1Z:http 183.138.35.202:61349 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 103.40.223.36:52852 ESTABLISHED
tcp 0 18720 iZ2832m5qa1Z:http 3.52.184.60.broad:53417 ESTABLISHED
tcp 0 8385 iZ2832m5qa1Z:http 125.36.248.155:21057 ESTABLISHED
tcp 0 20160 iZ2832m5qa1Z:http 3.52.184.60.broad:53418 ESTABLISHED
tcp 0 15840 iZ2832m5qa1Z:http 61.159.21.88:52754 ESTABLISHED
tcp 0 19600 iZ2832m5qa1Z:http OFSfx-12p8-167.pp:39607 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 180.112.206.79:53807 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 180.112.206.79:53804 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 113.143.49.201:58213 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 113.143.49.201:58214 ESTABLISHED
tcp 0 13140 iZ2832m5qa1Z:http KD182251243016.au:41091 ESTABLISHED
tcp 0 19600 iZ2832m5qa1Z:http 220.172.205.84:64506 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 183.138.35.202:61351 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 124.228.157.148:cm ESTABLISHED
tcp 0 14095 iZ2832m5qa1Z:http 115.77.130.139:57265 ESTABLISHED
tcp 0 2575 iZ2832m5qa1Z:http 125.36.248.155:21058 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:ssh 157.61.153.165:63820 ESTABLISHED
tcp 0 11520 iZ2832m5qa1Z:http 180.175.15.94:60250 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http hn.kd.ny.adsl:5525 ESTABLISHED
tcp 0 16800 iZ2832m5qa1Z:http 36.104.17.199:12445 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 124.23.133.76:36709 ESTABLISHED
tcp 0 25410 iZ2832m5qa1Z:http 221.227.160.76:50909 ESTABLISHED
tcp 0 27377 iZ2832m5qa1Z:http 36.104.17.199:12444 ESTABLISHED
tcp 0 5695 iZ2832m5qa1Z:http 89.42.62.210:17259 ESTABLISHED
tcp 0 9617 iZ2832m5qa1Z:http 113.118.244.198:21199 ESTABLISHED
tcp 0 18200 iZ2832m5qa1Z:http hn.kd.ny.adsl:52590 ESTABLISHED
tcp 0 5365 iZ2832m5qa1Z:http 113.118.244.198:21200 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 175.152.152.119:54357 ESTABLISHED
tcp 0 2623 iZ2832m5qa1Z:http 114.138.243.190:52567 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 180.175.15.94:60249 ESTABLISHED
tcp 0 16060 iZ2832m5qa1Z:http sp49-98-175-192.m:62563 ESTABLISHED
tcp 0 18161 iZ2832m5qa1Z:http 221.227.160.76:50910 ESTABLISHED
tcp 0 16800 iZ2832m5qa1Z:http 220.202.153.122:61180 ESTABLISHED
tcp 0 17205 iZ2832m5qa1Z:http 117.136.82.1:9890 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 183.249.139.93:19404 ESTABLISHED
tcp 0 11520 iZ2832m5qa1Z:http 180.175.15.94:60251 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 111.14.82.93:8895 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 115.216.229.234:50027 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 45.19.224.121.broa:7317 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 103.40.223.36:52855 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 223.101.243.33:29598 ESTABLISHED
tcp 0 15840 iZ2832m5qa1Z:http 115.77.130.139:57272 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 182.84.62.177:16124 ESTABLISHED
tcp 0 11072 iZ2832m5qa1Z:http 89.42.62.210:17262 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 3.52.184.60.broad:53461 ESTABLISHED
tcp 0 2859 iZ2832m5qa1Z:http 89.42.62.210:17263 ESTABLISHED
tcp 0 15714 iZ2832m5qa1Z:http 183.204.8.177:37090 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 118.206.38.35:53403 ESTABLISHED
tcp 0 17280 iZ2832m5qa1Z:http 180.175.15.94:60252 ESTABLISHED
tcp 0 1412 iZ2832m5qa1Z:ssh 157.61.153.165:64208 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 203.152.92.76:61435 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http ppp118-208-236-25:55869 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 171.232.170.106:56428 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 228.148.61.59.bro:59308 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 223.73.223.248:tsspmap ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 220.202.153.122:61179 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 175.165.26.63:56572 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 158.121.164.124.a:62007 ESTABLISHED
tcp 0 5045 iZ2832m5qa1Z:http 176.59.5.50:63602 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 121.31.250.178:37454 ESTABLISHED
tcp 0 34080 iZ2832m5qa1Z:http softbank060099014:63654 ESTABLISHED
tcp 0 17280 iZ2832m5qa1Z:http 14.159.99.11:53809 ESTABLISHED
tcp 0 14005 iZ2832m5qa1Z:http 36.104.17.199:12439 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 228.148.61.59.bro:19657 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 14.159.99.11:53811 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:ssh 157.61.153.165:63816 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:10019 106.11.68.13:http ESTABLISHED
tcp 0 12914 iZ2832m5qa1Z:http hn.kd.ny.adsl:52588 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 175.165.26.63:56575 ESTABLISHED
tcp 0 16789 iZ2832m5qa1Z:http 221.227.160.76:50911 ESTABLISHED
tcp 0 14600 iZ2832m5qa1Z:http 176.59.5.50:63605 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 113.222.234.253:26039 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 222.82.92.2:infolibria ESTABLISHED
tcp 0 4063 iZ2832m5qa1Z:http 113.118.244.198:21201 ESTABLISHED
tcp 0 11263 iZ2832m5qa1Z:http 222.82.92.2:siebel-ns ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 117.136.23.13:32643 ESTABLISHED
tcp 0 0 iZ2832m5qa1Z:http 222.82.92.2:ultrabac ESTABLISHED
tcp 0 16749 iZ2832m5qa1Z:http 124.94.104.65:50974 ESTABLISHED
[root@iZ2832m5qa1Z ~]#
top - 15:37:34 up 1:08, 3 users, load average: 0.06, 0.10, 0.11
Tasks: 172 total, 2 running, 170 sleeping, 0 stopped, 0 zombie
%Cpu(s): 8.4 us, 1.7 sy, 0.0 ni, 89.9 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem: 1016656 total, 488972 used, 527684 free, 30400 buffers
KiB Swap: 0 total, 0 used, 0 free. 107448 cached Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1558 root 20 0 64208 5280 3904 S 0.7 0.5 0:11.14 AliYunDun
11417 www 20 0 281096 10020 4076 S 0.7 1.0 0:00.06 httpd
11586 www 20 0 282632 11428 4076 S 0.7 1.1 0:00.11 httpd
11627 www 20 0 280840 9636 4076 S 0.7 0.9 0:00.02 httpd
11817 www 20 0 282632 11408 4076 S 0.7 1.1 0:00.06 httpd
11899 www 20 0 282632 11472 4132 S 0.7 1.1 0:00.08 httpd
12145 www 20 0 282632 11412 4076 S 0.7 1.1 0:00.06 httpd
12160 www 20 0 282632 11468 4132 S 0.7 1.1 0:00.03 httpd
12176 www 20 0 282632 11408 4068 S 0.7 1.1 0:00.05 httpd
12247 www 20 0 280840 9624 4068 S 0.7 0.9 0:00.02 httpd
24 root 20 0 0 0 0 S 0.3 0.0 0:03.19 rcu_sched
25 root 20 0 0 0 0 R 0.3 0.0 0:06.95 rcuos/0
1174 mysql 20 0 797928 45012 5308 S 0.3 4.4 0:07.13 mysqld
1574 root 20 0 78596 8676 5044 S 0.3 0.9 0:13.55 AliHids
11486 www 20 0 282632 11440 4076 S 0.3 1.1 0:00.06 httpd
12159 www 20 0 280840 9628 4068 S 0.3 0.9 0:00.01 httpd
1 root 20 0 49552 3652 2292 S 0.0 0.4 0:00.74 systemd
2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd
3 root 20 0 0 0 0 S 0.0 0.0 0:00.07 ksoftirqd/0
5 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/0:0H
6 root 20 0 0 0 0 S 0.0 0.0 0:00.06 kworker/u30:0
7 root rt 0 0 0 0 S 0.0 0.0 0:00.00 migration/0
8 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcu_bh
9 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/0
10 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/1
11 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcuob/2
HTTP进程超级多，怎么会事，怎么会有那么多人访问啊！受到攻击了？然后问了说确实是很多人。于是判断是高并发导致，于是改下httpd.conf和httpd-mpm.conf配置，有
Timeout 30
KeepAlive On
MaxKeepAliveRequests 80
KeepAliveTimeout 15
<IfModule prefork.c>
ServerLimit 1024
StartServers 5
MinSpareServers 5
MaxSpareServers 10
MaxClients 1024
MaxRequestsPerChild 100
</IfModule>
<IfModule mpm_prefork_module>
StartServers 5
MinSpareServers 5
MaxSpareServers 10
MaxClients 1000
MaxRequestWorkers 1000
MaxConnectionsPerChild 0
</IfModule>
<IfModule mpm_winnt_module>
ThreadsPerChild 1000
MaxConnectionsPerChild 0
</IfModule>
不过，好像然并卵，访问还是那么慢，很卡。
同学登陆阿里云一看，服务器的带宽是1M，那么访问经常是900多K。。。
带宽不足啊，服务器访问一分钟有100个IP吧，不过看了CPU和内存还是OK的啊。
于是，升级带宽到2M，访问快啦。。。
