Werk #14416: Agent controller: Fix agent data transport for IPv4-only hosts

Component

Agent bakery

Title

Agent controller: Fix agent data transport for IPv4-only hosts

Date

Jun 15, 2022

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.2.0b1	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.1.0p3	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The agent controller (cmk-agent-ctl) crashed on IPv4-only hosts when attempting to open a TCP socket in order to allow Checkmk to connect to the host and collect agent data. Note that on Linux hosts, this crash only occured if IPv6 was disabled at the kernel level. The corresponding error message read

ERROR [cmk_agent_ctl] Address family not supported by protocol (os error 97)

Note that this crash only affected the transport of agent data, not the host registration.

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