Live · AIX 7.1 · 7.2 · 7.3 · ppc64

Caddy for AIX

v2.9.1 · Apache 2.0 · LibrePower

Caddy
web server
for IBM AIX

Name: Caddy for AIX
Author: LibrePower

The modern web server and reverse proxy — now on AIX 7.1–7.3. Automatic HTTPS, load balancing, zero dependencies. 5,300+ req/s on POWER9.

5,358 r/sPOWER9 (c=50)

~51 MBBinary size

0Dependencies

Download RPM GitLab → More AIX packages

Go 1.24.11 ppc64 XCOFF CGO_ENABLED=0 Static binary

Caddy 2.9.1 ppc64 · XCOFF

Automatic HTTPS

Let's Encrypt and ZeroSSL. Zero-config TLS, auto-renewed.

Reverse Proxy

Load balancing, health checks, circuit breakers on AIX.

Zero Dependencies

Static binary ~51 MB. No runtime, no libc surprises.

All AIX Versions

Same binary on AIX 7.1, 7.2 and 7.3. No changes needed.

How it works

Install. Configure. Serve.

The Caddy web server runs on AIX with the same Caddyfile you know from Linux. Reverse proxy, file server, HTTPS, HTTP/2 — all working.

Add the repo.
Install with DNF.

One command adds the LibrePower repository to AIX. No Go compiler. No build environment. Caddy installs and updates like any other package.

Download RPM GitLab →

aix-prod-01 — bash

# Add LibrePower repo (one-time)

root@aix7 # curl -fsSL https://aix.librepower.org/install.sh | sh

root@aix7 # dnf install caddy

✔ Installed: caddy-2.9.1-1.librepower

# Or grab the RPM directly

rpm -ivh caddy-2.9.1-1.librepower.aix7.1.ppc.rpm

root@aix7 #

Write a Caddyfile.
HTTPS for free.

Three lines configure a reverse proxy. Caddy contacts Let's Encrypt, gets a certificate, and renews it automatically — no openssl, no cron, no manual renewal.

Caddyfilereverse proxy + auto-HTTPS

your-domain.com {
    reverse_proxy localhost:8080 {
        health_uri      /health
        health_interval 10s
    }
    # TLS obtained automatically
}

# Run:
caddy run --config /opt/freeware/etc/caddy/Caddyfile

5,300+ req/s.
On POWER9.

Apache Bench, 10,000 requests, static file serving. The AIX port delivers within 1% of Linux on the same POWER9 node.

5,358req/s (c=50)AIX 7.3 POWER9

5,412req/s (c=50)Ubuntu ppc64le

13msp99 latencyAIX POWER9

~51 MB static Zero runtime deps

AIX support

7.1 / 7.2 / 7.3

ppc64 XCOFF · CGO_ENABLED=0

4 files patched

+badger/dir_aix.go — AIX implementation

±badger/dir_unix.go — !aix build tag

+badger/v2/dir_aix.go — AIX implementation

±badger/v2/dir_unix.go — !aix build tag

Sources: SOURCES/ on GitLab

AIX 7.1, 7.2, 7.3.
Same binary.

Compiled with CGO_ENABLED=0. The only AIX-specific change: replacing unix.Flock with native fcntl locking in the embedded badger store — four files, open source on GitLab.

Capabilities on AIX

Full feature parity.
Nothing left behind.

All core Caddy features confirmed on AIX. What works on Linux works on POWER.

✓

File Server

Static files and directory listings on AIX.

✓

Reverse Proxy

Load balancing, health checks, circuit breakers.

✓

Automatic HTTPS

Let's Encrypt and ZeroSSL. Auto-renews, no cron.

✓

HTTP/2

Full multiplexing and header compression.

✓

Admin API

Live reload on localhost:2019. Zero restarts.

✓

JSON Config

Full programmatic config alongside Caddyfile.

Performance

POWER9. Within 1% of Linux.

Apache Bench · 10K requests · static file serving · same physical POWER9 node.

Metric	AIX 7.3 POWER9 LibrePower	Ubuntu ppc64le POWER9
Requests/s (c=50)	5,358	5,412
Requests/s (c=100)	5,307	5,389
p99 Latency	13–24 ms	12–22 ms

Apache Bench · 10K requests · concurrency c=50/100 · static file serving · same POWER9 node.

FAQ

Common questions

How do I install Caddy as a web server on AIX?

Run curl -fsSL https://aix.librepower.org/install.sh | sh to add the repo, then dnf install caddy. Works on AIX 7.1, 7.2 and 7.3 — no additional dependencies.

Does Caddy work as a reverse proxy on IBM AIX?

Yes. Load balancing, health checks, circuit breakers — configure with the reverse_proxy directive. Easier than Apache's mod_proxy.

Does Caddy handle HTTPS automatically on AIX?

Yes. Caddy automatically obtains and renews TLS certificates from Let's Encrypt or ZeroSSL. Point a domain at your server, configure it in the Caddyfile, and Caddy handles the rest.

Do I need Go installed on AIX to run Caddy?

No. Fully static binary (~51 MB). No Go runtime, no build tools. Install the RPM and run immediately.

How does Caddy compare to nginx or Apache on AIX?

Automatic TLS with zero manual configuration, a simpler Caddyfile syntax, and a single static binary with no system library dependencies — no AIX version headaches. Performance is comparable at ~5,300 req/s on POWER9.

What AIX versions does Caddy support?

AIX 7.1, 7.2 and 7.3. Statically compiled (CGO_ENABLED=0), no additional libraries required across all three versions.

Open Source for IBM Power