CNAME 域名跳转 nginx 配置问题

现在有两个域名example1.org和example2.org, example1.org是可以访问的, example2是CNAME指向example1.org的, 可以ping到对的ip, 我尝试在nginx配置里加上example2.org了, 虚拟主机配置是这样的:
server {
listen 80;

server_name example1.org example2.org;
root /var/www/blah

# if ($host ~* "^example2.org$") {
# rewrite ^(.*)$ http://example1.org permanent;
# break;
# }

location / {
include uwsgi_params;
uwsgi_pass unix:/tmp/blah_uwsgi.sock;
}

location /static/ {
alias /var/www/blah/static;
}

error_log /var/log/nginx/blah/error.log;
access_log /var/log/nginx/blah/access.log;
}
后面注释掉的部分是照http://serverfault.com/questions/302017/setup-cname-for-subdomain-issue改过的, 可以还是没用...Google好久了, 求解答...