fix(agents-login): pin OpenAI auth host to IPv4 so codex sign-in works (musl + broken IPv6)#745
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…s (musl + broken IPv6)
codex 0.141 ships a musl static binary; in this cluster IPv6 egress is
unreachable and musl ignores /etc/gai.conf, so auth.openai.com AAAA answers make
`codex login --device-auth` fail before it tries IPv4 ("error sending request
... deviceauth/usercode", CLI exits 1). The earlier gai.conf approach was inert
for musl — remove it.
Add a `codex-auth-hosts` init container (runner image) that resolves the OpenAI
auth host A-records at pod startup and writes a complete pod-local /etc/hosts
(localhost + ipv6 loopback + pod IP/hostname + IPv4 pins), shared via an emptyDir
mounted read-only at the worker's /etc/hosts. musl reads /etc/hosts before DNS,
so codex connects over IPv4 (working egress). Dynamic resolution avoids the
staleness of static hostAliases when Cloudflare rotates IPs; CODEX_IPV4_HOSTS is
configurable if more hosts need pinning.
Scoped to agents-login sign-in; the agent-runner runtime codex needs the same
treatment separately.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This was referenced Jun 27, 2026
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Problem
codex login --device-authfails ("CLI exited with code 1 before login completed";error sending request … auth.openai.com/api/accounts/deviceauth/usercode). codex 0.141 ships a musl static binary; this cluster has no IPv6 egress, and musl ignores/etc/gai.conf(so the earlier gai.conf fix was inert) —auth.openai.comAAAA answers make codex try IPv6 and fail with no IPv4 fallback.Fix
Remove the inert
gai.conf. Add acodex-auth-hostsinit container that resolves the OpenAI auth host A-records at pod startup and writes a complete pod-local/etc/hosts(localhost + ipv6 loopback + pod IP/hostname + IPv4 pins), shared via an emptyDir mounted read-only at the worker's/etc/hosts. musl reads/etc/hostsbefore DNS, so codex connects over IPv4. Dynamic resolution avoids statichostAliasesgoing stale on Cloudflare IP rotation;CODEX_IPV4_HOSTSis configurable.Validation
Sandbox can't reach the cluster, so this needs a real deploy. After Flux reconciles I'll verify the worker's
/etc/hostshas the IPv4 pin and thatcodex login --device-authreaches the user-code step. (The agent-runner runtime codex needs the same treatment — separate follow-up.)🤖 Generated with Claude Code