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Containers often cause significant trouble depending on how they're set up, and they're not always trivial for their users to extract info from. Here we're trying to detect if we're running inside a container on Linux. There are plenty of approaches and none is perfectly clean nor reliable, which makes sense since the goal is to remain transparent enough. One interesting approach is to rely on the observation that containers generally do not expose most kernel threads, and that the very firsts of them are extremely stable across all kernel versions: pid 2 was called "keventd" in kernel 2.4, became "kthreadd" in kernel 2.6, and has since not changed. This is true on all architectures tested, even with highly stripped down kernels such as those found on 15 year-old OpenWRT images. And this one doesn't appear inside containers. Thus here we check if we find such a thread via /proc and whether it's called keventd or kthreadd, to detect a container, and we set the "cont_techno" variable to "yes" or "no" depending on what is found. |
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| admin | ||
| dev | ||
| doc | ||
| examples | ||
| include | ||
| reg-tests | ||
| scripts | ||
| src | ||
| tests | ||
| .cirrus.yml | ||
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| .mailmap | ||
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| BRANCHES | ||
| BSDmakefile | ||
| CHANGELOG | ||
| CONTRIBUTING | ||
| INSTALL | ||
| LICENSE | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
| SUBVERS | ||
| VERDATE | ||
| VERSION | ||
The HAProxy documentation has been split into a number of different files for ease of use. Please refer to the following files depending on what you're looking for : - INSTALL for instructions on how to build and install HAProxy - BRANCHES to understand the project's life cycle and what version to use - LICENSE for the project's license - CONTRIBUTING for the process to follow to submit contributions The more detailed documentation is located into the doc/ directory : - doc/intro.txt for a quick introduction on HAProxy - doc/configuration.txt for the configuration's reference manual - doc/lua.txt for the Lua's reference manual - doc/SPOE.txt for how to use the SPOE engine - doc/network-namespaces.txt for how to use network namespaces under Linux - doc/management.txt for the management guide - doc/regression-testing.txt for how to use the regression testing suite - doc/peers.txt for the peers protocol reference - doc/coding-style.txt for how to adopt HAProxy's coding style - doc/internals for developer-specific documentation (not all up to date)