Nginx as static image server and proxy server.

server{#you can access images by http://localhost:8000/images listen 8000;
server_name localhost;

location /images/{
root /share/;
autoindex on;
autoindex_exact_size off;
autoindex_localtime on;
}
}

server{#you can access images by http://localhost:9000/images listen 9000;
server_name localhost;

location /images/{
root /share/;
autoindex on;
autoindex_exact_size off;
autoindex_localtime on;
}
}

upstream image_backend{#weight
server 127.0.0.1:8000 weight=10 max_fails=1 fail_timeout=5;
server 127.0.0.1:9000 weight=10;
#server 127.0.0.1:10000 backup;
}

upstream image_backend1{#ip_hash
ip_hash;
server 127.0.0.1:8000;
server 127.0.0.1:9000;
}

#upstream image_backend2{#select server according to server responding
#    server 127.0.0.1:8000;
#    server 127.0.0.1:9000;
#    fair;#third party
#}

#upstream image_backend3{#url hash
#    server 127.0.0.1:8000;
#    server 127.0.0.1:9000;
#    hash $request_uri;
#    hash_method crc32;
#}

proxy_connect_timeout 10;
proxy_read_timeout 180;
proxy_send_timeout 5;
proxy_buffer_size 16k;
proxy_buffers 4 256k;
proxy_busy_buffers_size 256k;
proxy_temp_file_write_size 256k;
proxy_temp_path /tmp/temp_dir;
proxy_cache_path /tmp/proxy_cache_dir levels=1:2 keys_zone=cache_one:200m inactive=3d max_size=10g;

http {
include       mime.types;
default_type  application/octet-stream;

sendfile        on;
tcp_nopush     on;

#keepalive_timeout  0;
keepalive_timeout  65;

#gzip  on;

include image_servers.conf;
include http_proxy_cache.conf;
include upstream_image_servers.conf;

}

server {
listen       80;
server_name  10.197.60.137;

location ~ .*\.(gif|jpg|png|css|js)(.*) {
proxy_cache cache_one;
proxy_cache_valid 200 302 24h;

proxy_cache_valid 301 304 30d;
proxy_cache_valid any 5m;
expires 90d;
add_header X-Cache HIT-Linux;
proxy_cache_key $host$uri$is_args$args;

proxy_set_header X-Real-IP $remote_addr;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_pass http://image_backend; proxy_redirect off;
}