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32 lines
1.1 KiB
Markdown
32 lines
1.1 KiB
Markdown
# Using the bcc utility with LinuxKit
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The `bcc` utility is a standard Linux tool to access performance
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counters, trace events and access various other kernel internals for
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performance analysis.
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The `bcc` utility needs to matched be with the kernel. For recent
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kernel build, LinuxKit provides a `linuxkit/kernel-bcc` package with
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a matching tag for each kernel under `linuxkit/kernel`.
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The preferred way of using the `linuxkit/kernel-bcc` package is to
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add it to the `init` section. This adds `/usr/share/bcc` to the
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systems' root filesystem. From there it can be
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- bind mounted into your container
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- accessed via `/proc/1/root/usr/share/bcc/tools` from with in the `getty`
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or `ssh` container.
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- accessed via a nsenter of `/bin/ash` of proc 1.
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If you want to use `bcc` you may also want to remove the `sysctl`
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container, or alternatively, disable the kernel pointer restriction it
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enables by default:
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```
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echo 0 > /proc/sys/kernel/kptr_restrict
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```
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Now, `bcc` is ready to use. The LinuxKit `bcc` package contains
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the `bcc` binary, example and tool scripts, and kernel headers for the
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associated kernel build.
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