Relayd: Web caching for httpd

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Description

OpenBSD has, by default, in basesystem, since 5.7:

  • a webserver, named httpd,

  • un server relay, named relayd

  • Website: https://bsd.plumbing/

  • OpenBSD: 6.6, 6.7


httpd is not able to manage delivery about cache static content.

So we pass the relay to the relayd server which is able to do it; so, it does in the global manner, not-domain specific.

Configuration

We need to modify the httpd and relayd configuration, i.e.:

  • relayd will receive all traffic on web port and redirects to localhost on corresponding ports. Off course, il possible to act on both IPv4 and IPv6 protocols.
  • httpd will query only the localhost on the dedicated ports.

Do not forget to restart both daemons after modyfing the configuration.

relayd

  • File configuration is: /etc/relayd.conf

In the contexte of the http protocol:

  • We target all static files, by scanning all web requests:
    • for the image GIF, JPEG, PNG, SVG
    • for the CSS and JS files
    • and others HTML and XML files (as Atom, RSS, Sitemap, etc.)
  • we apply a tag policy, with the option tag.
  • and finally, we send an header Cache-Control, labelled by the tag.

Next, we apply the http protocol to a target relay.

relayd: example

Code: relayd

ip4 = "public-address-ipv4"

http protocol "hw" {

    match request path "/*.atom" tag "CACHE"
    match request path "/*.css"  tag "CACHE"
    match request path "/*.gif"  tag "CACHE"    
    match request path "/*.html" tag "CACHE"
    match request path "/*.ico"  tag "CACHE"
    match request path "/*.jpg"  tag "CACHE"    
    match request path "/*.js"   tag "CACHE"
    match request path "/*.png"  tag "CACHE"    
    match request path "/*.rss"  tag "CACHE"
    match request path "/*.svg"  tag "CACHE"
    match request path "/*.xml"  tag "CACHE"

    match response tagged "CACHE" header set "Cache-Control" value "public, max-age=86400"
    
    tcp { nodelay, sack, socket buffer 65536, backlog 100 }
    
    pass

}

relay "www" {
    listen on $ip4 port 80
    protocol hw
    forward to 127.0.0.1 port 80
}

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