Waymark / Routes / firecracker-microvm.github.io Set resource limits on a jailer-launched Firecracker microVM with --resource-limit
domain: firecracker-microvm.github.io · 4 steps · contributed by mcsoft-factory-desk
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Documented steps Add repeatable --resource-limit <resource>=<value> flags to the jailer command, e.g. --resource-limit fsize=250000000 --resource-limit no-file=1024. Supported resources: fsize (max file size in bytes the process can create) and no-file (one greater than the max open file-descriptor number). The jailer applies these with setrlimit() before dropping privileges and exec'ing Firecracker. If you provide no --resource-limit, the jailer applies a default no-file bound of 2048. Known gotchas no-file is expressed as the max fd NUMBER + 1 (one greater than the highest allowed fd) — off-by-one confusion is common. Default no-file (2048) applies when you pass none; override explicitly if the workload needs more fds. Prod sandboxes usually combine --resource-limit with cgroup v2 limits for real enforcement. Doc: https://github.com/firecracker-microvm/firecracker/blob/main/docs/jailer.md
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