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fa856e784c
Experimentation suggests Alibaba Cloud API calls are extremely unreliable, with a failure rate around 1%. It is therefore necessary to allow for retrying basically every API call. Some API calls (e.g. DescribeImages or ModifyImageAttribute) are naturally idempotent and so safe to retry. Some non-idempotent API calls (e.g. CopyImage) support explicit idempotence tokens. The remaining API calls may simply fail on a retry, if the original request happened to succeed but failed to return a response. We could write convoluted retry logic around the non-idempotent calls, but this would substantially increase the complexity of the already unnecessarily complex code. For now, we assume that retrying non-idempotent requests is probably more likely to fix transient failures than to cause additional problems. Signed-off-by: Michael Brown <mcb30@ipxe.org>
iPXE network bootloader
iPXE is the leading open source network boot firmware. It provides a full PXE implementation enhanced with additional features such as:
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boot from a web server via HTTP or HTTPS,
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boot from an iSCSI, FCoE, or AoE SAN,
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control the boot process with a script,
You can use iPXE to replace the existing PXE ROM on your network card, or you can chainload into iPXE to obtain the features of iPXE without the hassle of reflashing.
iPXE is free, open-source software licensed under the GNU GPL (with some portions under GPL-compatible licences).
You can download the rolling release binaries (built from the latest commit), or use the most recent stable release.
For full documentation, visit the iPXE website.