nginx时间到第一个字节

我在一台机器上运行几个项目，下面有所有的信息。
在nginxconfiguration中如果PHP项目使用fastcgicaching， Node.js项目使用proxy_pass ，所有项目使用gzip 。

我是新来维护服务器，我的问题是所有的项目运行testing例如http://www.webpagetest.org/ 第一个字节的时间是如此之高 ，我一直search几个星期，我不明白为什么？ 并想知道这些结果是这台机器的瓶颈？ 还是我想念什么？ 任何build议表示赞赏！
domain1.com – 690 ms First Byte Time, 6 ms Target First Byte Time
sub.domain2.com – 509 ms First Byte Time, 6 ms Target First Byte Time
domain4.com – 1772 ms First Byte Time, 9 ms Target First Byte Time

背景信息

 linode 1 GB RAM 1 CPU Core 24 GB SSD Storage 2 TB Transfer 40 Gbps Network In 125 Mbps Network Out nginx PHP Node.js PostgreSQL 

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nginxconfiguration

 server { listen 80; server_name domain1.com www.domain1.com; access_log /var/log/nginx/domain1.com.access.log; root /var/www/html/domain1.com; index index.php index.html index.htm; try_files $uri $uri/ /index.php?$query_string; client_max_body_size 1G; location ~ \.php$ { fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; include /etc/nginx/fastcgi_params; fastcgi_connect_timeout 300; fastcgi_send_timeout 300; fastcgi_read_timeout 300; fastcgi_buffer_size 32k; fastcgi_buffers 8 32k; # cache fastcgi_cache domain1.com; fastcgi_cache_valid 200 60m; fastcgi_cache_methods GET HEAD; fastcgi_cache_key $scheme$request_method$host$request_uri; fastcgi_ignore_headers Cache-Control Expires Set-Cookie; } } server { listen 80; server_name sub.domain1.com www.sub.domain1.com; access_log /var/log/nginx/sub.domain1.com.access.log; root /var/www/html/sub.domain1.com; index index.php index.html index.htm; try_files $uri $uri/ /index.php?$query_string; client_max_body_size 1G; location ~ \.php$ { fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; include /etc/nginx/fastcgi_params; fastcgi_connect_timeout 300; fastcgi_send_timeout 300; fastcgi_read_timeout 300; fastcgi_buffer_size 32k; fastcgi_buffers 8 32k; # cache fastcgi_cache sub.domain1.com; fastcgi_cache_valid 200 60m; fastcgi_cache_methods GET HEAD; fastcgi_cache_key $scheme$request_method$host$request_uri; fastcgi_ignore_headers Cache-Control Expires Set-Cookie; } } server { listen 80; server_name domain2 www.domain2; access_log /var/log/nginx/domain2.access.log; location / { proxy_pass http://127.00.0.1:8001/; } } server { listen 80; server_name sub.domain2 www.sub.domain2; access_log /var/log/nginx/sub.domain2.access.log; location ~ ^/sitemap/(.*)$ { root /var/www/html/sub.domain2/app/Sitemap/SitemapGz; } location /robots.txt { alias /var/www/html/sub.domain2/app/robots.txt; } location ~ ^/(images/|javascripts/|stylesheets/|fonts) { root /var/www/html/sub.domain2/app/assets; access_log off; expires max; } location / { set $fixed_destination $http_destination; if ( $http_destination ~* ^https(.*)$ ) { set $fixed_destination http$1; } proxy_pass http://127.00.0.1:8002/; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header Destination $fixed_destination; client_max_body_size 32M; client_body_buffer_size 512k; proxy_connect_timeout 300; proxy_send_timeout 300; proxy_read_timeout 300; proxy_buffer_size 4k; proxy_buffers 4 32k; proxy_busy_buffers_size 64k; proxy_temp_file_write_size 64k; } } server { listen 80; server_name domain3.io www.domain3.io; access_log /var/log/nginx/domain3.io.access.log; location / { proxy_pass http://127.00.0.1:8003/; } } server { listen 80; server_name domain4.com www.domain4.com; access_log /var/log/nginx/domain4.com.access.log; root /var/www/html/domain4.com; index index.php index.html index.htm; try_files $uri $uri/ /index.php?$query_string; client_max_body_size 1G; location ~ ^/sitemap/(.*)$ { root /var/www/html/domain4.com/app/Sitemap/SitemapGz; } location /robots.txt { alias /var/www/html/domain4.com/app/robots.txt; } location ~ ^/(images/|javascripts/|stylesheets/|fonts) { root /var/www/html/domain4.com/app/assets; access_log off; expires max; } location ~ \.php$ { fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; include /etc/nginx/fastcgi_params; fastcgi_connect_timeout 300; fastcgi_send_timeout 300; fastcgi_read_timeout 300; fastcgi_buffer_size 32k; fastcgi_buffers 8 32k; # cache fastcgi_cache domain4.com; fastcgi_cache_valid 200 60m; fastcgi_cache_methods GET HEAD; fastcgi_cache_key $scheme$request_method$host$request_uri; fastcgi_ignore_headers Cache-Control Expires Set-Cookie; } } 

免费-m

  total used free shared buffers cached Mem: 987 721 266 3 19 124 -/+ buffers/cache: 577 409 Swap: 255 133 122 

ps aux –sort -rss | 头
（用户apache是​​nginx，因为我用来在这台机器上安装apache，但现在停止服务）

 USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND apache 24505 5.2 13.1 372208 132552 ? R 06:33 1:26 php-fpm: pool www apache 24502 4.8 12.5 366332 126748 ? R 06:33 1:20 php-fpm: pool www root 15490 0.2 11.6 1036476 117820 ? Ssl Sep30 1:30 node /var/www/html/sub.domain4.com/app/app.js root 11488 0.0 3.3 905404 34336 ? Ssl Sep15 16:21 PM2 v0.14.7: God Daemon apache 24866 7.0 3.0 265504 30448 ? S 06:56 0:18 php-fpm: pool www apache 25247 7.3 2.6 262260 26976 ? S 06:58 0:10 php-fpm: pool www apache 25449 7.1 2.3 259408 24260 ? S 06:58 0:07 php-fpm: pool www mongod 3584 0.9 1.9 653472 19588 ? Sl Sep07 317:26 /usr/bin/mongod -f /etc/mongod.conf root 2637 0.1 1.0 431044 11096 ? Sl Sep07 56:31 /usr/bin/python -Es /usr/bin/fail2ban-server -s /var/run/fail2ban/fail2ban.sock -p /var/run/fail2ban/fail2ban.pid -x -b 

df -h

 Filesystem Size Used Avail Use% Mounted on /dev/xvda 24G 3.3G 20G 15% / tmpfs 492M 108K 492M 1% /dev/shm 

已经停止了apache

sudo lsof -nPi | grep“：80（LISTEN）”

 nginx 15280 root 12u IPv4 91859687 0t0 TCP *:80 (LISTEN) nginx 15282 nginx 12u IPv4 91859687 0t0 TCP *:80 (LISTEN) 

服务httpd状态

 httpd is stopped 

UPDATE

在升级到2GB内存2个CPU内核之后，当我ping通域名或者再次使用http://www.webpagetest.orgtesting时速度更快，但是在报告中Target First Byte Time变得更高了，这是什么原因？

免费-m

  total used free shared buffers cached Mem: 1991 744 1246 12 78 229 -/+ buffers/cache: 436 1554 Swap: 255 0 255 

ps aux –sort -rss | 头

 USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 2732 0.5 6.7 1069664 136836 ? Ssl 09:46 0:07 node /var/www/html/domain/app/app.js mongod 2598 0.4 3.4 649400 69728 ? Sl 09:43 0:06 /usr/bin/mongod -f /etc/mongod.conf root 2706 0.1 2.2 978924 45424 ? Ssl 09:45 0:02 PM2 v0.14.7: God Daemon apache 5458 6.1 1.7 268540 35964 ? S 10:03 0:16 php-fpm: pool www apache 5518 6.6 1.7 267752 35184 ? S 10:03 0:16 php-fpm: pool www apache 5332 6.8 1.7 267604 35100 ? S 10:02 0:20 php-fpm: pool www apache 5330 6.8 1.6 267420 34568 ? S 10:02 0:20 php-fpm: pool www apache 5493 7.1 1.6 266028 33484 ? S 10:03 0:18 php-fpm: pool www postgres 2557 0.3 0.9 324640 19812 ? S 09:43 0:04 /usr/pgsql-9.4/bin/postmaster -D /var/lib/pgsql/9.4/data 

df -h

 Filesystem Size Used Avail Use% Mounted on /dev/xvda 24G 2.3G 21G 10% / tmpfs 994M 108K 994M 1% /dev/shm 

domain1.com – 108 ms First Byte Time, 108 ms Target First Byte Time
sub.domain2.com – 514 ms First Byte Time, Target First Byte Time
domain4.com – 124 ms First Byte Time, 114 ms Target First Byte Time