nginx redirect all traffic

Question

domain.com and b.domain.com. Both subdomains are on different servers. I'm using nginx as my webserver. What must I change to nginx.conf to redirect all traffic from a.domain.com to b.domain.com?

Thank you!

Answer 1

This question could stand to provide more details. Can we assume nginx is the httpd on both servers? What kind of configuration is already in place?

This howto gives a hint which leads me to suggest this:

On server a.domain.com:

server {
    listen       80;
    server_name  a.domain.com;
    rewrite   ^  http://b.domain.com$request_uri?;
}

On server b.domain.com:

server {
    listen       80;
    server_name  b.domain.com;
    // Remaining vhost configuration
}

Answer 2

pjmorse's answer is good (so I upvoted it), but I use a slightly different scheme on a.domain:

server {
  server_name a.domain.com c.domain.com d.domain.com;    # you can serve any number of redirects from here...
  listen 80;
  rewrite (.*) http://b.domain.com$1 permanent;
}

This returns a HTTP 301 return code (moved permanently) instead of the 307 that some webservers may return.